Powered by Deep Web Technologies
Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Duct Leakage Impacts on VAV System Performance in Large Commercial  

NLE Websites -- All DOE Office Websites (Extended Search)

Duct Leakage Impacts on VAV System Performance in Large Commercial Duct Leakage Impacts on VAV System Performance in Large Commercial Buildings Title Duct Leakage Impacts on VAV System Performance in Large Commercial Buildings Publication Type Report LBNL Report Number LBNL-53605 Year of Publication 2003 Authors Wray, Craig P., and Nance Matson Abstract The purpose of this study is to evaluate the variability of duct leakage impacts on air distribution system performance for typical large commercial buildings in California. Specifically, a hybrid DOE-2/TRNSYS sequential simulation approach was used to model the energy use of a low-pressure terminal-reheat variable-air-volume (VAV) HVAC system with six duct leakage configurations (tight to leaky) in nine prototypical large office buildings (representing three construction eras in three California climates where these types of buildings are common). Combined fan power for the variable-speed-controlled supply and return fans at design conditions was assumed to be 0.8 W/cfm. The VAV system that we simulated had perfectly insulated ducts, and maintained constant static pressure in the ducts upstream of the VAV boxes and a constant supply air temperature at the air-handler. Further evaluations of duct leakage impacts should be carried out in the future after methodologies are developed to deal with duct surface heat transfer effects, to deal with airflows entering VAV boxes from ceiling return plenums (e.g., to model parallel fan-powered VAV boxes), and to deal with static pressure reset and supply air temperature reset strategies.

2

Duct leakage impacts on VAV system performance in California large commercial buildings  

SciTech Connect

The purpose of this study is to evaluate the variability of duct leakage impacts on air distribution system performance for typical large commercial buildings in California. Specifically, a hybrid DOE-2/TRNSYS sequential simulation approach was used to model the energy use of a low-pressure terminal-reheat variable-air-volume (VAV) HVAC system with six duct leakage configurations (tight to leaky) in nine prototypical large office buildings (representing three construction eras in three California climates where these types of buildings are common). Combined fan power for the variable-speed-controlled supply and return fans at design conditions was assumed to be 0.8 W/cfm. Based on our analyses of the 54 simulation cases, the increase in annual fan energy is estimated to be 40 to 50% for a system with a total leakage of 19% at design conditions compared to a tight system with 5% leakage. Annual cooling plant energy also increases by about 7 to 10%, but reheat energy decreases (about 3 to 10%). In combination, the increase in total annual HVAC site energy is 2 to 14%. The total HVAC site energy use includes supply and return fan electricity consumption, chiller and cooling tower electricity consumption, boiler electricity consumption, and boiler natural gas consumption. Using year 2000 average commercial sector energy prices for California ($0.0986/kWh and $7.71/Million Btu), the energy increases result in 9 to 18% ($7,400 to $9,500) increases in HVAC system annual operating costs. Normalized by duct surface area, the increases in annual operating costs are 0.14 to 0.18 $/ft{sup 2}. Using a suggested one-time duct sealing cost of $0.20 per square foot of duct surface area, these results indicate that sealing leaky ducts in VAV systems has a simple payback period of about 1.3 years. Even with total leakage rates as low as 10%, duct sealing is still cost effective. This suggests that duct sealing should be considered at least for VAV systems with 10% or more total duct leakage. The VAV system that we simulated had perfectly insulated ducts, and maintained constant static pressure in the ducts upstream of the VAV boxes and a constant supply air temperature at the airhandler. Further evaluations of duct leakage impacts should be carried out in the future after methodologies are developed to deal with duct surface heat transfer effects, to deal with airflows entering VAV boxes from ceiling return plenums (e.g., to model parallel fan-powered VAV boxes), and to deal with static pressure reset and supply air temperature reset strategies.

Wray, Craig P.; Matson, Nance E.

2003-10-01T23:59:59.000Z

3

Energy Savings for Occupancy-Based Control (OBC) of Variable-Air-Volume (VAV) Systems  

SciTech Connect

This study evaluates the savings potential of occupancy based control (OBC) for large office buildings with VAV terminal boxes installed.

Zhang, Jian; Lutes, Robert G.; Liu, Guopeng; Brambley, Michael R.

2013-01-24T23:59:59.000Z

4

Commissioning and Diagnosis of VAV Air-Conditioning Systems  

E-Print Network (OSTI)

This paper presents a fault detection and diagnosis (FDD) strategy based on system knowledge, qualitative states and object-oriented statistical process control (SPC) models for typical pressure-independent variable air volume (VAV) air-conditioning systems. Eight FDD schemes are built to detect the eleven pre-defined VAV faults using the qualitative and quantitative FDD approaches within the strategy at two steps. The ten hard faults, which would affect the system operation, are analyzed at Step 1. The soft fault, which would not affect the basic system operation but would impact the supervisory controls, is analyzed at Step 2. The strategy is tested and validated on typical VAV systems involving multiple faults, both in simulation and in-situ tests. A software package is developed as a BMS-assisted automatic commissioning tool based on the FDD strategy. Off-line tests were conducted in both the simulated building and the real building.

Qin, J.; Wang, S.; Chan, C.; Xiao, F.

2006-01-01T23:59:59.000Z

5

The Optimization of Control Parameters for VAV HVAC System Commissioning  

E-Print Network (OSTI)

One of the technical subjects in commissioning for HVAC system is to enhance control performance and time efficiency, while the tuning of the optimal parameters to control HVAC system takes much time and labor in particular. Therefore, we propose a kind of commissioning technique as follows. We identified the dynamic characteristics of components of an actual VAV HVAC system such as rooms, VAV dampers, two way valves and chilled water coils, and verified the behaviors of the models and choose the optimal control parameters on a personal computer. Then adopting them for the actual system, we verified the control performance. Through the procedure, we showed the possibility of off-site and off-line control parameter tuning to reduce the cost and time at on-site and in on-line using the measured data in a real HVAC system.

Song, S.; Maehara, K.; Sagara, N.

2006-01-01T23:59:59.000Z

6

Analysis of the Energy Consumption of VAV System in Different Supply Air Control Strategies  

Science Conference Proceedings (OSTI)

Variable air volume (VAV) system has been widely applied due to its characteristics of eminent energy saving and thermal comfort. Because of its above characteristics, sophisticated automatic control systems are required to support its operation. While ... Keywords: VAV A/C system, supply air control strategy, energy consumption analysis

Junjie Guo, Xiangxin Cheng

2012-07-01T23:59:59.000Z

7

Final Project Report: Self-Correcting Controls for VAV System Faults Filter/Fan/Coil and VAV Box Sections  

SciTech Connect

This report addresses original research by the Pacific Northwest National Laboratory for the California Institute for Energy and Environment on self-correcting controls for variable-air-volume (VAV) heating, ventilating and air-conditioning systems and focuses specifically on air handling and VAV box components of the air side of the system. A complete set of faults for these components was compiled and a fault mode analysis performed to understand the detectable symptoms of the faults and the chain of causation. A set of 26 algorithms was developed to facilitate the automatic correction of these faults in typical commercial VAV systems. These algorithms include training tests that are used during commissioning to develop models of normal system operation, passive diagnostics used to detect the symptoms of faults, proactive diagnostics used to diagnose the cause of a fault, and finally fault correction algorithms. Ten of the twenty six algorithms were implemented in a prototype software package that interfaces with a test bed facility at PNNL's Richland, WA, laboratory. Measurement bias faults were instigated in the supply-air temperature sensor and the supply-air flow meter to test the algorithms developed. The algorithms as implemented in the laboratory software correctly detected, diagnosed and corrected these faults. Finally, an economic and impact assessment was performed for the State of California for deployment of self-correcting controls. Assuming 15% HVAC energy savings and a modeled deployment profile, 3.1-5.8 TBu of energy savings are possible by year 15.

Brambley, Michael R.; Fernandez, Nicholas; Wang, Weimin; Cort, Katherine A.; Cho, Heejin; Ngo, Hung; Goddard, James K.

2011-05-01T23:59:59.000Z

8

Problem of Vain Energy Consumption in a VAV Air Conditioning System Shared By an Inner Zone and Exterior Zone  

E-Print Network (OSTI)

In northern China, there are a large number of space buildings divided in inner zone and exterior zone based on usage requirements. The exterior zone needs to be heated in winter and cooled in summer, while the inner zone needs to be cooled both in winter and summer. Taking a practical project as example, this paper analyzes the energy consumption of a VAV air conditioning system that is shared by inner zone and exterior zone. The paper also points out the serious problem of useless energy consumption for this kind of system.

Wenji, G.; Ling, C.; Dongdong, L.; Mei, S.; Li, Z.

2006-01-01T23:59:59.000Z

9

Theoretical Study of a Novel Control Method of VAV Air-conditioning System Based on MATLAB  

E-Print Network (OSTI)

The main purpose of this study is to put forward a novel nonlinear feedback control strategy on controlling indoor air temperature by variable air volume. A dynamic model of a typical room for a VAV air-conditioning system is established. The performance of the novel control strategy is investigated. Simulation of the controlling air temperature, on which the novel strategy is adopted, was carried out based on MATLAB in the VAV system. In order to show that the novel control strategy outperforms conventional PID control, a comparison is made between the performance of conventional PID and the novel nonlinear feedback control strategy. The results show that nonlinear feedback control strategy outperforms a conventional PID control system in terms of celerity, stability and other aspects.

Shi, Z.; Hu, S.; Wang, G.; Li, A.

2006-01-01T23:59:59.000Z

10

Automatic Commissioning of Multiple VAV Terminals  

E-Print Network (OSTI)

A site survey on a modern operating commercial building screened 261 ineffective VAV (Variable Air Volume) boxes (20.9% of the total boxes in the building) and summarized ten typical faults for VAV air-conditioning system(s) resulting in energy waste, performance degradation or totally out of control. A strategy is developed to automatically check the health condition of VAV terminals and diagnose the faults. Hybrid approach is employed to establish a commissioning and re-commissioning tool of VAV air-conditioning system. Performance indices with expert rules based on system physical characteristics are adopted to detect and diagnose the nine of the ten faults. PCA (Principal Component Analysis) method is developed to detect and diagnose the VAV box flow sensor bias (Fault 10) and to reconstruct the faulty sensors. A multiple VAV fault FDD strategy for a VAV entire system is developed, which is validated in simulation and filed tests.

Qin, J.; Wang, S.

2004-01-01T23:59:59.000Z

11

Variable Speed Drive Volumetric Tracking (VSDVT) for Airflow Control in Variable Air Volume (VAV) Systems  

E-Print Network (OSTI)

An airflow control method has been developed for variable air volume (VAV) systems. This airflow control method is named VSD volumetric tracking (VSDVT) since both the supply and return airflows are determined using signals of the variable speed drives (VSD) instead of the flow stations. Its performance is studied and compared with the fan tracking (FT) method using model simulations. The VSDVT maintains a constant building pressure and the required outside airflow under all load conditions, reduces the annual return air fan energy by up to 50%, and the annual supply air fan energy by up to 30%. This paper presents the VSDVT method, the system models, and the simulation results.

Liu, M.

2002-01-01T23:59:59.000Z

12

Analysis of the Potential Energy Savings for 14 Office Buildings with VAV Systems  

E-Print Network (OSTI)

At the beginning of an existing building commissioning (EBCx)/energy retrofit project, some form of screening is usually applied to determine whether there is sufficient potential for savings to justify a formal EBCx assessment/energy audit. In this study, an improved methodology for potential energy savings estimation from EBCx/retrofit measures, based on Baltazar's methodology (2006), is proposed to perform this type of screening. The improvements are included on optimization parameters, space load calculation, simulation of buildings with multiple types of HVAC systems, AHU shutdown simulation, among others. The improved methodology was used to estimate annual potential energy cost savings for 14 office buildings in Austin, TX with either single duct VAV (SDVAV) systems or dual duct VAV (DDVAV) systems. The estimates are based on very limited information about the buildings and the built-in HVAC systems as well as one year of utility bills. From this analysis, the methodology has predicted an average total potential savings of 36% for SDVAV systems with electric terminal reheat, 22% for SDVAV systems with hot water reheat, and 25% for DDVAV systems. To validate these results, the estimated potential savings are compared with savings proposed in respective EBCx assessment reports. Based on the comparison of the report estimates and the potential savings with the improved methodology, it was found that 'generalized' factors of assessment predicted energy cost savings to estimated potential energy cost savings could be found. The factors identified in these cases were 0.68, 0.66, and 0.61 for each type of system - SDVAV w/electric reheat, SDVAV w/hot water reheat, and DDVAV, respectively.

Claridge, D. E.; Liu, J.; Baltazar, J. C.

2010-01-01T23:59:59.000Z

13

Field testing of component-level model-based fault detection methods for mixing boxes and VAV fan systems  

SciTech Connect

An automated fault detection and diagnosis tool for HVAC systems is being developed, based on an integrated, life-cycle, approach to commissioning and performance monitoring. The tool uses component-level HVAC equipment models implemented in the SPARK equation-based simulation environment. The models are configured using design information and component manufacturers' data and then fine-tuned to match the actual performance of the equipment by using data measured during functional tests of the sort using in commissioning. This paper presents the results of field tests of mixing box and VAV fan system models in an experimental facility and a commercial office building. The models were found to be capable of representing the performance of correctly operating mixing box and VAV fan systems and detecting several types of incorrect operation.

Xu, Peng; Haves, Philip

2002-05-16T23:59:59.000Z

14

A Functional Test Procedure for the improved commissioning of a VAV system  

E-Print Network (OSTI)

In the context of the IEA40 research project, a specification of a “Functional Test Procedure” was progressively developed using the CA-MET building in Namur as real size test bench for the application and validation of the procedure. The target system is a typical VAV system devoted to the ventilation, cooling and air conditioning functions. The procedure consists in a series of operations to be applied to the system, considered as a set of connected components and taking into account the following constraints: 1) time availability 2) intrinsic limitations of the system 3) reference performances. The proposed procedure is divided in two sets of actions: 1) a number of preliminary actions allowing to take the best benefit of the subsequent phases: a) identification of available measurement points b) identification of actuators characteristics c) identification of control strategies d) aeraulic network calculations e) selection of measurement techniques and experimental design 2) the verification tasks themselves: The philosophy of the verification process is to bring the system into a number of states which allowed each specific check to be carried out. The organisation of the procedure tries to optimize the time spent for commissioning by logically sequencing the operations according to the following order: 1) test in manual (ie not controlled by the BEMS) operation 2) test in manual (ie not controlled by the BEMS) stop 3) test in normal operation 4) test at maximum flowrate 5) test at minimum flowrate 6) test in automatic stop The paper will provide the specific operations to be carried out at each step and will illustrate the whole process with the prototyping work performed on the CA-MET building in Namur.

Andre, P.; Lacote, P.; Aparecida Silva, C.; Hannay, J.; Lebrun, J.

2004-01-01T23:59:59.000Z

15

Impacts of Static Pressure Reset on VAV System Air Leakage, Fan Power and Thermal Energy - Part 2: Case Demonstration for a Typical Climate System  

E-Print Network (OSTI)

In Part 1 of this paper, the theoretical models, integrating the fan airflow, fan head, air leakage factors, are developed to analyze the impacts of the static pressure reset on both pressure dependent and pressure independent terminal boxes. In this part, a simulated air handling unit (AHU) system in Omaha NE is used to demonstrate the energy savings performance in one typical climate year. This AHU system has a static pressure reset system and two constant static pressure systems, one having pressure dependent terminal boxes and one having pressure independent terminal boxes. These simulated systems were compared mainly on the basis of fan power energy consumption and thermal energy consumption in totally a year. The example presents a good agreement with the theoretical model and simulation results. It was also shown that static pressure reset provides a promising and challenging way for the energy performance in VAV system.

Liu, M.; Zheng, K.; Wu, L.; Wang, Z.; Johnson, C.

2007-01-01T23:59:59.000Z

16

Impacts of Static Pressure Reset on VAV System Air Leakage, Fan Power and Thermal Energy - Part I: Theoretical Model and Simulation  

E-Print Network (OSTI)

As for a variable air volume (VAV) system, the air duct static pressure is a typical control variable maintained by modulating supply fan speed. The static pressure equals to the summation of the duct pressure loss downstream of the sensor to the terminal box and box inlet static pressure. Typically, the air duct static pressure is set as a constant set point based on the system design information and sensor location. However, under partial load conditions, the terminal box dampers have to be closed more since either required airflow is less than the design airflow which directly leads to much less pressure loss. Thus the static pressure set point should be reset lower in order to reduce fan power, avoid noise at terminal box dampers and box damper malfunction due to excessive pressure. Different static pressure reset schedules are reviewed and compared, considering the influence of outside air temperature on the building load, availability of the VAV box damper positions, the airflow ratio based static pressure reset has also applicable advantages over the existing constant static pressure set point and two typical reset methods. This paper present the theoretical models to express the impacts of static pressure reset on fan airflow, fan head, air leakage, fan power and thermal energy for both pressure independent and pressure dependent boxes. The impacts are also demonstrated using the parametric analysis and numerical results to show the benefits of the static pressure reset including reducing fan power, cooling energy and heating energy.

Liu, M.; Feng, J.; Wang, Z.; Wu, L.; Zheng, K.; Pang, W.

2007-01-01T23:59:59.000Z

17

INTEGRATED ENERGY SYSTEMS: PRODUCTIVITY & BUILDING SCIENCE  

E-Print Network (OSTI)

of Large Commercial HVAC Systems Led by Erik Kolderup, Eley Associates, Inc. Advanced VAV System Design will modify their rating system for tubular daylighting devices; and 2) U-factor results will affect how NFRC) E3 10/03 Advanced VAV System Design Guideline (Eley) E4 5/03 Integrated Design of Small Commercial

18

Determining Critical Pressure and Duct Leakage in VAV Air-Handling...  

NLE Websites -- All DOE Office Websites (Extended Search)

for moving air in buildings use a significant amount of energy. It is well known that fan energy use in variable-air-volume (VAV) systems can be reduced by resetting the supply...

19

Determining Critical Pressure and Duct Leakage in VAV Air-Handling Units  

NLE Websites -- All DOE Office Websites (Extended Search)

Determining Critical Pressure and Duct Leakage in VAV Air-Handling Units Determining Critical Pressure and Duct Leakage in VAV Air-Handling Units Speaker(s): Clifford Federspiel Date: December 3, 2003 - 12:00pm Location: Bldg. 90 Seminar Host/Point of Contact: Nance Matson Fans for moving air in buildings use a significant amount of energy. It is well known that fan energy use in variable-air-volume (VAV) systems can be reduced by resetting the supply duct pressure. The standard way to reset duct pressure is by controlling the most-open terminal damper to a nearly open position. Most systems can't measure terminal damper positions, so pressures are either not reset at all or use ad hoc resetting strategies that are configured sub-optimally. In this seminar I will describe a new method of determining the critical supply duct pressure for VAV systems.

20

Duct leakage impacts on VAV system performance in California large commercial buildings  

E-Print Network (OSTI)

GLOSSARY 34 REFERENCES. 34 APPENDIX I: BUILDING SCHEDULES.. 37 APPENDIX II: REGRESSION EQUATIONS AND COEFFICIENTS . 40 APPENDIX III: ENERGY

Wray, Craig P.; Matson, Nance E.

2003-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Duct leakage impacts on VAV system performance in California large commercial buildings  

E-Print Network (OSTI)

divided by the supply fan design airflow. The downstreamThe supply (and return) fan design airflow was determined byThe intermediate-floor supply fan design airflows for each

Wray, Craig P.; Matson, Nance E.

2003-01-01T23:59:59.000Z

22

Duct leakage impacts on VAV system performance in California large commercial buildings  

E-Print Network (OSTI)

kW) Total Fan Power (kW) Climate Zone CZ3 (Oakland) CZ9 (Coil Sizes (kBtu/(h·floor)) Climate Zone CZ3 (Oakland) CZ9 (all three vintages and climate zones ranged from 0.9999 to

Wray, Craig P.; Matson, Nance E.

2003-01-01T23:59:59.000Z

23

Duct leakage impacts on VAV system performance in California large commercial buildings  

E-Print Network (OSTI)

air leakage rate, then proposed buildings will be rewarded for sealingduct sealing even more cost-effective. Table 5. TRNSYS Air-

Wray, Craig P.; Matson, Nance E.

2003-01-01T23:59:59.000Z

24

Duct leakage impacts on VAV system performance in California large commercial buildings  

E-Print Network (OSTI)

chiller and cooling tower electricity consumption, boilerchiller and cooling tower electricity consumption, boilerheat outdoors using a cooling tower. A natural-gas-fired

Wray, Craig P.; Matson, Nance E.

2003-01-01T23:59:59.000Z

25

Duct leakage impacts on VAV system performance in California large commercial buildings  

E-Print Network (OSTI)

electricity consumption, and boiler natural gas consumption. Using yearelectricity consumption, and boiler natural gas consumption. Using yearelectricity consumption, and boiler natural gas consumption. Using year

Wray, Craig P.; Matson, Nance E.

2003-01-01T23:59:59.000Z

26

Development of a Laboratory Verified Single-Duct VAV System Model with Fan Powered Terminal Units Optimized Using Computational Fluid Dynamics  

E-Print Network (OSTI)

Single Duct Variable Air Volume (SDVAV) systems use series and parallel Fan Powered Terminal Units to control the air flow in conditioned spaces. This research developed a laboratory verified model of SDVAV systems that used series and parallel fan terminal units where the fan speeds were controlled by either Silicon Controlled Rectifiers (SCR) or Electronically Commutated Motors (ECM) motors. As part of the research, the model was used to compare the performance of the systems and to predict the harmonics generated by ECM systems. All research objectives were achieved. The CFD model, which was verified with laboratory measurements, showed the potential to identify opportunities for improvement in the design of the FPTU and accurately predicted the static pressure drop as air passed through the unit over the full operating range of the FPTU. Computational fluid dynamics (CFD) models of typical a FPTU were developed and used to investigate opportunities for optimizing the design of FPTUs. The CFD model identified key parameters required to conduct numerical simulations of FPTU and some of the internal components used to manufacture the units. One key internal component was a porous baffle used to enhance mixing when primary air and induced air entered the mixing chamber. The CFD analysis showed that a pressure-drop based on face velocity model could be used to accurately predict the performance of the FPTU. The SDVAV simulation results showed that parallel FPTUs used less energy overall than series systems that used SCR motors as long as primary air leakage was not considered. Simulation results also showed that series ECM FPTUs used about the same amount of energy, within 3 percent, of parallel FPTU even when leakage was not considered. A leakage rate of 10 percent was enough to reduce the performance of the parallel FPTU to the level of the series SCR system and the series ECM FPTUs outperformed the parallel FPTUs at all weather locations used in the study.

Davis, Michael A.

2010-08-01T23:59:59.000Z

27

Performance of thermal distribution systems in large commercial buildings  

NLE Websites -- All DOE Office Websites (Extended Search)

Performance of thermal distribution systems in large commercial buildings Performance of thermal distribution systems in large commercial buildings Title Performance of thermal distribution systems in large commercial buildings Publication Type Journal Article LBNL Report Number LBNL-44331 Year of Publication 2002 Authors Xu, Tengfang T., François Rémi Carrié, Darryl J. Dickerhoff, William J. Fisk, Jennifer A. McWilliams, Duo Wang, and Mark P. Modera Journal Energy and Buildings Volume 34 Start Page Chapter Pagination 215-226 Abstract This paper presents major findings of a field study on the performance of five thermal distribution systems in four large commercial buildings. The five systems studied are typical single-duct or dual-duct constant air volume (CAV) systems and variable air volume (VAV) systems, each of which serves an office building or a retail building with floor area over 2,000 m2. The air leakage from ducts are reported in terms of effective leakage area (ELA) at 25 Pa reference pressure, the ASHRAE-defined duct leakage class, and air leakage ratios. The specific ELAs ranged from 0.7 to 12.9 cm2 per m2 of duct surface area, and from 0.1 to 7.7 cm2 per square meter of floor area served. The leakage classes ranged from 34 to 757 for the five systems and systems sections tested. The air leakage ratios are estimated to be up to one-third of the fan- supplied airflow in the constant-air-volume systems. The specific ELAs and leakage classes indicate that air leakage in large commercial duct systems varies significantly from system to system, and from system section to system section even within the same thermal distribution system. The duct systems measured are much leakier than the ductwork specified as "unsealed ducts" by ASHRAE. Energy losses from supply ducts by conduction (including convection and radiation) are found to be significant, on the scale similar to the losses induced by air leakage in the duct systems. The energy losses induced by leakage and conduction suggest that there are significant energy-savings potentials from duct-sealing and insulation practice in large commercial buildings

28

Parametric System Curves: Correlations Between Fan Pressure Rise and Flow for Large Commercial Buildings  

SciTech Connect

A substantial fraction of HVAC energy use in large commercial buildings is due to fan operation. Fan energy use depends in part on the relationship between system pressure drop and flow through the fan, which is commonly called a "system curve." As a step toward enabling better selections of air-handling system components and analyses of common energy efficiency measures such as duct static pressure reset and duct leakage sealing, this paper shows that a simple four-parameter physical model can be used to define system curves. Our model depends on the square of the fan flow, as is commonly considered. It also includes terms that account for linear-like flow resistances such as filters and coils, and for supply duct leakage when damper positions are fixed or are changed independently of static pressure or fan flow. Only two parameters are needed for systems with variable-position supply dampers (e.g., VAV box dampers modulating to control flow). For these systems, reducing or eliminating supply duct leakage does not change the system curve. The parametric system curve may be most useful when applied to field data. Non-linear techniques could be used to fit the curve to fan pressure rise and flow measurements over a range of operating conditions. During design, when measurements are unavailable, one could use duct design calculation tools instead to determine the coefficients.

Sherman, Max; Wray, Craig

2010-05-19T23:59:59.000Z

29

Fault Detection and Diagnosis in Building HVAC Systems  

E-Print Network (OSTI)

in AHU of VAV system”, Energy Conversion & Management, 30.energy efficient building management system”, Energy Conversionenergy efficient building management system”, Energy Conversion

Najafi, Massieh

2010-01-01T23:59:59.000Z

30

Comparison of energy efficiency between variable refrigerant flow systems and ground source heat pump systems  

E-Print Network (OSTI)

comparison of VAV and VRF air conditioning systems in anThe variable refrigerant flow (VRF) and ground source heatthe energy efficiency of VRF systems compared with GSHP

Hong, Tainzhen

2010-01-01T23:59:59.000Z

31

System dynamics based models for selecting HVAC systems for office buildings: a life cycle assessment from carbon emissions perspective.  

E-Print Network (OSTI)

??This study aims to explore the life cycle environmental impacts of typical heating ventilation and air condition (HVAC) systems including variable air volume (VAV) system,… (more)

Chen, S

2011-01-01T23:59:59.000Z

32

Performance of ECM controlled VAV fan powered terminal units  

E-Print Network (OSTI)

Empirical performance models of fan airflow, primary airflow and power consumption were developed for series and parallel variable air volume fan powered terminal units. An experimental setup and test procedure were created to test the terminal units at typical design pressures and airflows. Each terminal unit observed in this study used an 8 in (20.3 cm) primary air inlet. Two fan motor control methods were considered. The primary control of interest was the electronically commutated motor (ECM) controller. Data collected were compared with previous research regarding silicon rectified control (SCR) units. Generalized models were developed for both series and parallel terminal units. Coefficients for performance models were then compared with comparable SCR controlled units. Non-linear statistical modeling was performed using SPSS software (2008). In addition to airflow and power consumption modeling, power quality was also quantified. Relationships between real power (watts) and apparent power (VA) were presented as well as harmonic frequencies and total harmonic distortion. Power quality was recorded for each ECM controlled terminal unit tested. Additional tests were also made to SCR controlled terminal units used in previous research (Furr 2006). The airflow and power consumption performance models had an R2 equal to 0.990 or greater for every terminal unit tested. An air leakage model was employed to account for leakage in the parallel designed VAV terminal units when the internal fan was turned off. For the leakage model, both ECM and SCR controlled units achieved an R2 greater than or equal to 0.918.

Cramlet, Andrew Charles

2008-08-01T23:59:59.000Z

33

Monitoring Large Systems Via Statistical Sampling  

Science Conference Proceedings (OSTI)

As the trend in parallel systems scales toward petaflop performance tapped by advances in circuit density and by an increasingly available computational Grid, the development of efficient mechanisms for monitoring large systems becomes imperative. When ... Keywords: Large systems, performance monitoring, statistical sampling

Celso L. Mendes; Daniel A. Reed

2004-05-01T23:59:59.000Z

34

Large File System Backup: NERSC Global File System Experience  

E-Print Network (OSTI)

Large File System Backup NERSC Global File System ExperienceNational Laboratory Abstract NERSC’s Global File system (from all compute systems at NERSC, holds files and data from

Mokhtarani, Akbar

2008-01-01T23:59:59.000Z

35

Very Large System Dynamics Models - Lessons Learned  

Science Conference Proceedings (OSTI)

This paper provides lessons learned from developing several large system dynamics (SD) models. System dynamics modeling practice emphasize the need to keep models small so that they are manageable and understandable. This practice is generally reasonable and prudent; however, there are times that large SD models are necessary. This paper outlines two large SD projects that were done at two Department of Energy National Laboratories, the Idaho National Laboratory and Sandia National Laboratories. This paper summarizes the models and then discusses some of the valuable lessons learned during these two modeling efforts.

Jacob J. Jacobson; Leonard Malczynski

2008-10-01T23:59:59.000Z

36

Modeling needs for very large systems.  

Science Conference Proceedings (OSTI)

Most system performance models assume a point measurement for irradiance and that, except for the impact of shading from nearby obstacles, incident irradiance is uniform across the array. Module temperature is also assumed to be uniform across the array. For small arrays and hourly-averaged simulations, this may be a reasonable assumption. Stein is conducting research to characterize variability in large systems and to develop models that can better accommodate large system factors. In large, multi-MW arrays, passing clouds may block sunlight from a portion of the array but never affect another portion. Figure 22 shows that two irradiance measurements at opposite ends of a multi-MW PV plant appear to have similar irradiance (left), but in fact the irradiance is not always the same (right). Module temperature may also vary across the array, with modules on the edges being cooler because they have greater wind exposure. Large arrays will also have long wire runs and will be subject to associated losses. Soiling patterns may also vary, with modules closer to the source of soiling, such as an agricultural field, receiving more dust load. One of the primary concerns associated with this effort is how to work with integrators to gain access to better and more comprehensive data for model development and validation.

Stein, Joshua S.

2010-10-01T23:59:59.000Z

37

Duct Systems in Large Commercial Buildings: Physical  

NLE Websites -- All DOE Office Websites (Extended Search)

Duct Systems in Large Commercial Buildings: Physical Characterization, Air Leakage, and Heat Conduction Gains William 1. Fisk, Woody Delp, Rick Diamond, Darryl Dickerhoff, Ronnen Levinson, Mark Modera, Matty Nematollahi, Duo Wang Environmental Energy Technologies Division Indoor Environment Department Lawrence Berkeley National Laboratory Berkeley CA 94720 March 30, 1999 This work was supported by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Building Technology and Community Systems, of the US Department of Energy under Contract No. DE-AC03-76SF00098 and by the California Institute For Energy Efficiency. LBNL-42339

38

Large hydrofoil transmission system study. Final report  

SciTech Connect

This report presents the results of a study to determine the performance and physical characteristics of an ac electrical system intended for use as the propulsion system of large hydrofoils. Section I provides a technical description of the system in terms of performance, weight and component characteristics. Section II describes anticipated problems associated with development of the system and its components, and includes activities through design and fabrication, and qualification of an integrated system. Two system configurations are considereed in this study. Configuration I which is the preferred one, consists of two direct-turbine-driven ac generators supplying electrical power to either foilborne or hullborne propeller induction drive motors. Conventional switchgear is used for connecting the generator to either the foil or hull drive motors. Each induction motor supplies power to a fixed pitch propeller via a planetary type gearbox. Speed and power output of each induction motor is controlled by fuel to the turbine. Configuration II consists of independent foilborne and hullborne propulsion systems. For takeoff and foilborne operation, two direct LM2500 turbine-drive ac generators supply electrical power to the foil propeller induction motors. Operation in this mode is identical to Configuration I. Configuration II provides a trade off between greater system weight, against a lower hullborne fuel consumption rate obtained by operating smaller turbines in hullborne mode. This provides, potentially, a greater hullborne range.

1977-10-11T23:59:59.000Z

39

System for inspecting large size structural components  

DOE Patents (OSTI)

The present invention relates to a system for inspecting large scale structural components such as concrete walls or the like. The system includes a mobile gamma radiation source and a mobile gamma radiation detector. The source and detector are constructed and arranged for simultaneous movement along parallel paths in alignment with one another on opposite sides of a structural component being inspected. A control system provides signals which coordinate the movements of the source and detector and receives and records the radiation level data developed by the detector as a function of source and detector positions. The radiation level data is then analyzed to identify areas containing defects corresponding to unexpected variations in the radiation levels detected.

Birks, Albert S. (Columbus, OH); Skorpik, James R. (Kennewick, WA)

1990-01-01T23:59:59.000Z

40

Duct systems in large commercial buildings: physical characterization...  

NLE Websites -- All DOE Office Websites (Extended Search)

Duct systems in large commercial buildings: physical characterization, air leakage and heat conduction gains Title Duct systems in large commercial buildings: physical...

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Activation of Vav by the Gammaherpesvirus M2 Protein Contributes to the Establishment of Viral Latency in B Lymphocytes  

E-Print Network (OSTI)

Gammaherpesviruses subvert eukaryotic signaling pathways to favor latent infections in their cellular reservoirs. To this end, they express proteins that regulate or replace functionally specific signaling proteins of eukaryotic cells. Here we describe a new type of such viral-host interaction that is established through M2, a protein encoded by murine gammaherpesvirus 68. M2 associates with Vav proteins, a family of phosphorylation-dependent Rho/Rac exchange factors that play critical roles in lymphocyte signaling. M2 expression leads to Vav1 hyperphosphorylation and to the subsequent stimulation of its exchange activity towards Rac1, a process mediated by the formation of a trimolecular complex with Src kinases. This heteromolecular complex is coordinated by proline-rich and Src family-dependent phosphorylated regions of M2. Infection of Vavdeficient mice with gammaherpesvirus 68 results in increased long-term levels of latency in germinal center B lymphocytes, corroborating the importance of the M2/Vav cross talk in the process of viral latency. These results reveal a novel strategy used by the murine gammaherpesvirus family to subvert the lymphocyte signaling machinery to its own benefit. The persistence of herpesvirus in the infected organism is dictated by the establishment of latency in particular cell types within the host. In the case of gammaherpesviruses, such as

Lénia Rodrigues; Marta Pires De Mir; María J. Caloca; Xosé R. Bustelo; J. Pedro Simas

2005-01-01T23:59:59.000Z

42

Design Considerations for Large Industrial Cogeneration Systems  

E-Print Network (OSTI)

Cogeneration systems have been contributing to the profitability of many industrial plants for years. However, with the renewed interest in energy and conservation as the cornerstone of the National Energy Act, it is important that the alternatives available to fully exploit this technology be fully understood. This paper will review the considerations required to develop meaningful cogeneration systems. Turbine types, ratings, steam conditions and other parameters will be discussed and their impact on economics will be illustrated. Furthermore, the influence of tax incentives on the economics of cogeneration systems will be explored.

Kovacik, J. M.

1979-01-01T23:59:59.000Z

43

Change propagation in large technical systems  

E-Print Network (OSTI)

Propagation of engineering changes has gained increasing scrutiny as the complexity and scale of engineered systems has increased. Over the past decade academic interest has risen, yielding some small-scale in-depth studies, ...

Giffin, Monica L. (Monica Lee)

2007-01-01T23:59:59.000Z

44

Approach for modelling of large maritime infrastructure systems  

Science Conference Proceedings (OSTI)

Simulation studies for large infrastructure systems often consists of a large number of experiments. Performing all experiments, and the required adjustments to simulation models, is time consuming. In addition it is difficult to keep track of all performed ...

Edwin C. Valentin; Sicco Steijaert; Rienk A. Bijlsma; Piero Silva

2005-12-01T23:59:59.000Z

45

High-performance verification of large concurrent systems  

E-Print Network (OSTI)

High-performance verification of large concurrent systems Elbie taKrpska Ph.D. Thesis VU University Systems Ph.D. Thesis Elzbieta Krepska VU University Amsterdam, 2012 #12;This research was funded by the VU. #12;VRIJE UNIVERSITEIT TOWARDS BIG BIOLOGY: HIGH-PERFORMANCE VERIFICATION OF LARGE CONCURRENT SYSTEMS

Bal, Henri E.

46

The Energy Asymptotics of Large Coulomb Systems  

E-Print Network (OSTI)

formal power series expansion in jjpjj \\Gamma1 ; then, we combine both A(y) and y(x) to understand M = 1, this system is an atom. In this case we can assume y = 0 and we denote its energy simply by E atom (Z). #12; 2 C. L. Fefferman, V. Ja. Ivrii, L. A. Seco, I. M. Sigal It is a remarkable fact that E

Seco, Luis A.

47

Web-based energy information systems for large commercial buildings  

E-Print Network (OSTI)

and benchmark energy use among a portfolio of buildings bybenchmark Motegi et al: Web-based Energy Information Systems For Large Commercial Buildings

Motegi, Naoya; Piette, Mary Ann

2003-01-01T23:59:59.000Z

48

Large Monitoring Systems: Data Analysis, Design and Deployment  

E-Print Network (OSTI)

Data Analysis, Design and Deployment by Ram Rajagopal AData Analysis, Design and Deployment by Ram Rajagopal DoctorRam Rajagopal, titled Large Monitoring Systems: Data Analysis,

Rajagopal, Ram

2009-01-01T23:59:59.000Z

49

Large-Eddy Simulation for Green Energy and Propulsion Systems...  

NLE Websites -- All DOE Office Websites (Extended Search)

Large-Eddy Simulation for Green Energy and Propulsion Systems PI Name: Umesh Paliath PI Email: paliath@ge.com Institution: General Electric Allocation Program: INCITE Allocation...

50

Web-based Energy Information Systems for Large Commercial Buildings  

NLE Websites -- All DOE Office Websites (Extended Search)

Web-based Energy Information Systems for Large Commercial Buildings Speaker(s): Naoya Motegi Date: May 2, 2002 - 12:00pm Location: Bldg. 90 Energy Information Systems (EIS), which...

51

Statistical abstraction and model-checking of large heterogeneous systems  

Science Conference Proceedings (OSTI)

We propose a new simulation-based technique for verifying applications running within a large heterogeneous system. Our technique starts by performing simulations of the system in order to learn the context in which the application is used. Then, it ...

Ananda Basu; Saddek Bensalem; Marius Bozga; Benoît Caillaud; Benoît Delahaye; Axel Legay

2010-06-01T23:59:59.000Z

52

Detection system based on a novel large area hybrid detector  

Science Conference Proceedings (OSTI)

A system level implementation of a large area hybrid detector is presented. The detector used in this system consists of an array of hydrogenated amorphous silicon photodiodes directly connected to a CMOS readout chip, which is vertically integrated ... Keywords: Amorphous silicon, Hybrid detectors, Large area photodetectors

A. Nascetti; P. Valerio; D. Caputo; G. de Cesare

2010-11-01T23:59:59.000Z

53

Recursive controllability and observability tests for large dynamic systems  

Science Conference Proceedings (OSTI)

Controllability and observability criteria for a linear stationary system are used to design recursive tests for slackening the computing system requirements for verification of the controllability and observability of large systems. Practical examples ... Keywords: 02.30.Yy+64.70.+p

E. Yu. Zybin; M. Sh. Misrikhanov; V. N. Ryabchenko

2006-05-01T23:59:59.000Z

54

Platforms and real options in large-scale engineering systems  

E-Print Network (OSTI)

This thesis introduces a framework and two methodologies that enable engineering management teams to assess the value of real options in programs of large-scale, partially standardized systems implemented a few times over ...

Kalligeros, Konstantinos C., 1976-

2006-01-01T23:59:59.000Z

55

Large-scale smart grids as system of systems  

Science Conference Proceedings (OSTI)

Smart Grids are advanced power networks that introduce intelligent management, control, and operation systems to address the new challenges generated by the growing energy demand and the appearance of renewal energies. In the literature, Smart Grids ... Keywords: service-oriented architecture (SOA), smart grids, systems of systems

Jennifer Pérez, Jessica Díaz, Juan Garbajosa, Agustín Yagüe, Eloy Gonzalez, Mercedes Lopez-Perea

2013-07-01T23:59:59.000Z

56

Large File System Backup: NERSC Global File System Experience  

SciTech Connect

NERSC's Global File system (NGF), accessible from all compute systems at NERSC, holds files and data from many scientific projects. A full backup of this file system to our High Performance Storage System (HPSS) is performed periodically. Disk storage usage by projects at NERSC has grown seven fold over a two year period, from ~;;20TB in June 2006 to ~;;140 TB in June 2008. The latest full backup took about 13 days and more than 200 T10k tape cartridges (.5 TB capacity). Petabyte file systems are becoming a reality in the next few years and the existing utilities are already strained in handling backup tasks.

Mokhtarani, Akbar; Andrews, Matthew; Hick, Jason; Kramer, William

2008-10-23T23:59:59.000Z

57

Simulation of the Post-Retrofit Thermal Energy Use for the University Teaching Center (UTC) Building with the Use of Simplified System Models  

E-Print Network (OSTI)

Several state owned buildings with dual-duct constant volume (DDCV) systems have been retrofitted with energy efficient variable air volume systems (VAV) as part of the Texas LoanSTAR Program. One method of determining the energy savings resulting from energy conserving retrofits relies on the use of a model for the daily whole building consumption, Epre, in the pre-retrofit configuration. Epre is typically a function of primary influencing parameters such as ambient temperature, humidity, building internal gains and others (Figure 1). Following the retrofit, the energy saved, Esav is determined using measured daily consumption, Emea3 as shown in Figure 1. This method is being used in the Texas LoanSTAR monitoring and analysis program for buildings that have adequate pre-retrofit monitored data (Kelly et al., 1992). Unfortunately, in the University Teaching Center (UTC) the retrofits were completed before the monitoring instrumentation was installed. Therefore, no pre-retrofit monitored data are available. Hence another method to estimate savings was needed. Such a method was developed and tested on a large engineering center (Katipamula and Claridge 1991). This method was based on the use of the ASHRAE TC 4.7 simplified energy analysis procedure (SEAP). It involved developing one model each for the VAV (post-retrofit system) and the DDCV (pre-retrofit system) systems.

Katipamula, S.; Claridge, D. E.

1991-01-01T23:59:59.000Z

58

A root cause localization model for large scale systems  

Science Conference Proceedings (OSTI)

Root cause localization, the process of identifying the source of problems in a system using purely external observations, is a significant challenge in many large-scale systems. In this paper, we propose an abstract model that captures the common issues ...

Emre Kiciman; Lakshminarayanan Subramanian

2005-06-01T23:59:59.000Z

59

Opto-Electronics in Large Array Gas Detector Systems  

E-Print Network (OSTI)

Large array gas detector systems are used in particle and nuclear physics experiments involving high-energy nucleon-nucleon and heavy-ion collisions. We have observed that in large array gas detector systems the momentary discharges inside the detector cells result in slowdown of High Voltage conditioning and possible hindrances in signal processing. We have explored the opto-electronic devices like the opto-coupler, optical fibre and signal processing circuit, which provide successful monitoring procedures and preventive measures to overcome the challenges produced in such complex detector systems.

M. R. Dutta Majumdar; Debasish Das; Tapan K. Nayak

2005-12-23T23:59:59.000Z

60

Energy Conservation of Air Conditioning Systems in Large Public Buildings  

E-Print Network (OSTI)

Analyzing the actuality of the large-scale public buildings' energy consumption, we know that most of them run not only in low efficiency, but also in high energy consumption. According to the characteristics of the building, we should proceed with the heating characteristics of the exterior -protected construction, the set value of the temperature of the air-conditioning, the lectotype of the Central air-conditioning system, the regulation and the modification of the transmission and distribution system, the use of the new energy and the daily management or the method of adjustment and control, and so on , so we can make the air-conditioning system run efficiently. Analyzing and comparing the large-scale public buildings' energy consumption with each other, some pointed improvement measures are proposed further. According to the study and analysis, even though large-scale public buildings consume a great of energy, there exists a huge potential for energy conservation.

Liu, P.; Li, D.

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Design and Specification Guidelines for Large Draft Fans and Systems  

Science Conference Proceedings (OSTI)

Design shortcomings in draft fans and related air-gas systems can cause fan failure and costly outages of large fossil fuel power plants. These guidelines will help engineers and manufacturers achieve a better understanding of the design features needed to minimize such failures.

1983-12-01T23:59:59.000Z

62

The systematic design of control systems for large multivariable linear time-invariant systems  

Science Conference Proceedings (OSTI)

A systematic design procedure for determining realistic feedforward-feedback control systems for large multivariable linear constant systems is outlined in this paper. A numerical example of a boiler system and a distillation column is included and a ...

E. J. Davison

1973-07-01T23:59:59.000Z

63

Incentive systems for large-scale energy projects  

Science Conference Proceedings (OSTI)

The potential benefits to be obtained and costs incurred from imposing an incentive rate of return system on a project which is government subsidized or is being considered by a regulated utility are described. The logical and procedural steps for measuring cost performance and determining the reward/penalty function for such a system are developed. An important certainty-enhancing feature is discussed. Then two real incentive return systems for large construction projects currently in place are critically appraised in light of criteria previously developed. 24 references, 4 figures, 3 tables.

Hass, J.E.

1984-01-01T23:59:59.000Z

64

Status and Future Developments in Large Accelerator Control Systems  

Science Conference Proceedings (OSTI)

Over the years, accelerator control systems have evolved from small hardwired systems to complex computer controlled systems with many types of graphical user interfaces and electronic data processing. Today's control systems often include multiple software layers, hundreds of distributed processors, and hundreds of thousands of lines of code. While it is clear that the next generation of accelerators will require much bigger control systems, they will also need better systems. Advances in technology will be needed to ensure the network bandwidth and CPU power can provide reasonable update rates and support the requisite timing systems. Beyond the scaling problem, next generation systems face additional challenges due to growing cyber security threats and the likelihood that some degree of remote development and operation will be required. With a large number of components, the need for high reliability increases and commercial solutions can play a key role towards this goal. Future control systems will operate more complex machines and need to present a well integrated, interoperable set of tools with a high degree of automation. Consistency of data presentation and exception handling will contribute to efficient operations. From the development perspective, engineers will need to provide integrated data management in the beginning of the project and build adaptive software components around a central data repository. This will make the system maintainable and ensure consistency throughout the inevitable changes during the machine lifetime. Additionally, such a large project will require professional project management and disciplined use of well-defined engineering processes. Distributed project teams will make the use of standards, formal requirements and design and configuration control vital. Success in building the control system of the future may hinge on how well we integrate commercial components and learn from best practices used in other industries.

Karen S. White

2006-10-31T23:59:59.000Z

65

Usenetfs: A Stackable File System for Large Article Directories  

E-Print Network (OSTI)

The Internet has grown much in popularity in the past few years. Numerous users read USENET newsgroups daily for entertainment, work, study, and more. USENET News servers have seen a gradual increase in the traffic exchanged between them, to a point where the hardware and software supporting the servers is no longer capable of meeting demand, at which point the servers begin "dropping " articles they could not process. The rate of this increase has been faster than software or hardware improvements were able to keep up, resulting in much time and effort spent by administrators upgrading their news systems. One of the primary reasons for the slowness of news servers has been the need to process many articles in very large flat directories representing newsgroups such as control. cancel and misc.jobs.offered. A large portion of the resources is spent on processing articles in these few newsgroups. Most Unix directories are organized as a linear unsorted sequence of entries. Large newsgr...

Erez Zadok; Ion Badulescu

1998-01-01T23:59:59.000Z

66

Commercialization analysis of large wind energy conversion systems. Final report  

DOE Green Energy (OSTI)

The framework is described that can be used to evaluate potential new federal incentives to facilitate the market acceptance of utility-scale wind energy conversion systems. The insights gained from utilizing this framework to evaluate a variety of hypothetical federal incentives are discussed. The heart of the evaluation framework is an explicit representation of the decisions made by utility purchasers, suppliers, and government agencies with respect to the utilization and fabrication of large wind energy conversion systems. The demand-side and supply-side aspects of the multiparty commercialization model are described, and the model's struture is explained. (LEW)

Boyd, D.W.; Buckley, O.E.; Haas, S.M.

1980-06-01T23:59:59.000Z

67

The Analysis and Development of Large Industrial Steam Systems  

E-Print Network (OSTI)

Chemicals, petroleum, pulp and paper, and many other industries depend heavily on extensive complex steam systems for thermal and mechanical energy delivery. Steam's versatility and desirable characteristics as both a heat transfer medium and a working fluid has fostered and perpetuated this dependency throughout industrial history. Many large process operations, however, have not developed their steam systems to keep pace with rapidly changing energy economics. As a result, the use of steam on industrial plants seldom approaches the optimum levels of first or second law efficiency. At each of many industrial complexes today, tens of millions of energy dollars per year are literally wasted. This paper describes some case histories comparing actual and optimum steam system configurations, and operational concepts. Highly effective steam system analytical techniques developed and used by the author are discussed. These include "energy level" mass balancing; the "three-branch" thermodynamic system; and powerful sophisticated digital computer steam system models. These latter are really "working models" on which development options can be tried and actively evaluated for economic and technical feasibility. The principal of steam as a plant-wide integrating energy system is explained and demonstrated with examples. These show how a properly structured and effectively operated steam system can increase operational flexibility and facilitate the practical implementation of many energy conservation opportunities in process and plant service areas.

Waterland, A. F.

1980-01-01T23:59:59.000Z

68

Large Scale Geothermal Exchange System for Residential, Office and Retail  

Open Energy Info (EERE)

Geothermal Exchange System for Residential, Office and Retail Geothermal Exchange System for Residential, Office and Retail Development Geothermal Project Jump to: navigation, search Last modified on July 22, 2011. Project Title Large Scale Geothermal Exchange System for Residential, Office and Retail Development Project Type / Topic 1 Recovery Act - Geothermal Technologies Program: Ground Source Heat Pumps Project Type / Topic 2 Topic Area 1: Technology Demonstration Projects Project Description RiverHeath will be a new neighborhood, with residences, shops, restaurants, and offices. The design incorporates walking trails, community gardens, green roofs, and innovative stormwater controls. A major component of the project is our reliance on renewable energy. One legacy of the land's industrial past is an onsite hydro-electric facility which formerly powered the paper factories. The onsite hydro is being refurbished and will furnish 100% of the project's electricity demand.

69

Parallel I/O Software Infrastructure for Large-Scale Systems  

NLE Websites -- All DOE Office Websites (Extended Search)

Parallel IO Software Infrastructure for Large-Scale Systems Parallel IO Software Infrastructure for Large-Scale Systems | Tags: Math & Computer Science Choudhary.png An...

70

The global distribution of large subaerial distributary fluvial systems  

E-Print Network (OSTI)

Large subaerial distributary fluvial systems are cone-shaped, alluvial deposits that are ubiquitous features on Earth. These non-marine, non-lacustrine deposits have superficial similarities to small alluvial fans but are at a scale that is orders of magnitude larger. A variety of terms have been used to identify these features, including alluvial cone, inland delta, wet alluvial fan, humid alluvial fan, alluvial fan, subaerial fan, terminal fan, and megafan. The first systematic examination of these features was presented by Wilkinson et al. (1997). This thesis attempts to provide a more detailed characterization and classification of these features. Fourteen systems in South America, Africa, and Asia were examined using Shuttle photography and AVHRR imagery. This study included: (1) maps of each system and their global distribution, (2) morphometric analyses, (3) classifications by climate, geology, and hydrology, and (4) a comparison to other fluvial systems. These systems have areas 8,881 to 239,583 km², radii 130 to 806 km, and slopes 0.00006 to 0.00079. Active and former river channel patterns on these features suggest that they formed by the action of a single river avulsing across the feature. The area of these features is unrelated to the area of the upstream drainage basin, but is related to the size of the downstream basin. This sample of systems occurs in a variety of climates and in two different geologic settings - foreland basins and half graben. The rivers on all systems are orientated transverse to the trend of the adjacent mountain range or fault. A variety of channel patterns are found on these systems. Considering the definitions of alluvial fans, rivers, and deltas, these systems are best classified as a specific variety of alluvial fan. A new alluvial fan classification scheme more inclusive than that proposed by Stanistreet and McCarthy (1993) is needed. The adoption of a common term to describe these systems - such as megafan - would help to eliminate some of the definitional ambiguities between them and other alluvial fans. Knowledge of these features will enhance our ability to interpret analogous features in the rock record, including important petroleum and water aquifers (e.g., the Ogallala Formation).

Gwynn, David Wilkinson

2002-01-01T23:59:59.000Z

71

Modeling of ECM Controlled Series Fan-powered VAV Terminal Units  

E-Print Network (OSTI)

Semi-empirical models for series fan-powered variable air volume terminal units (FPTUs) were developed based on models of the primary, plenum, fan airflow and the fan power consumption. The experimental setups and test procedures were developed respectively for primary, plenum and fan airflow to test each component of the FPTUs at typical design pressures and airflows. Two sizes of the terminal units from three manufacturers were used in this study. All of the FPTUs were equipped with electronically commutated motors (ECM). Data provided by the models were compared against the data from previous experiments to prove the models’ validity. Regression modeling was performed by using SigmaStat. The model of primary airflow had an R2 above 0.948 for all the terminal units evaluated while the plenum airflow model had an R2 above 0.99. For all the terminal units, the R2 of the fan airflow model was ranged from 0.973 to 0.998. Except for one fan, the fan power consumption model was able to characterize the power performance and had an R2 above 0.986. By combining the airflow and power models, the model for series FPTU was developed. Verification was made to prove the FPTU model’s validity by comparing the measured and predicted data of airflow and power consumption. Correction factors were used in the primary airflow model to compensate for the difference caused by large measurement errors and the system effects. The predicted values were consistent with measurements and no offset was needed in the primary airflow model. Generally, the newly established model was able to describe the airflow performance as well as power consumption of series FPTUs without adding complexity.

Yin, Peng

2010-08-01T23:59:59.000Z

72

Comparison of emerging diagnostic tools for large commercial HVAC systems  

SciTech Connect

Diagnostic software tools for large commercial buildings are being developed to help detect and diagnose energy and other performance problems with building operations. These software applications utilize energy management control system (EMCS) trend log data. Due to the recent development of diagnostic tools, there has been little detailed comparison among the tools and a limited awareness of tool capabilities by potential users. Today, these diagnostic tools focus mainly on air handlers, but the opportunity exists for broadening the scope of the tools to include all major parts of heating, cooling, and ventilation systems in more detail. This paper compares several tools in the following areas: (1) Scope, intent, and background; (2) Data acquisition, pre-processing, and management; (3) Problems detected; (4) Raw data visualization; (5) Manual and automated diagnostic methods and (6) Level of automation. This comparison is intended to provide practitioners and researchers with a picture of the current state of diagnostic tools. There is tremendous potential for these tools to help improve commercial building energy and non-energy performance.

Friedman, Hannah; Piette, Mary Ann

2001-04-06T23:59:59.000Z

73

CALIFORNIA ENERGY Market Connections Report  

E-Print Network (OSTI)

of Large Commercial HVAC Systems Led by Erik Kolderup, Eley Associates, Inc. Advanced VAV System Design will modify their rating system for tubular daylighting devices; and 2) U-factor results will affect how NFRC) E3 10/03 Advanced VAV System Design Guideline (Eley) E4 5/03 Integrated Design of Small Commercial

74

Structuring of Large-scale Complex Hybrid Systems: from Illustrative Analysis toward Modelization  

Science Conference Proceedings (OSTI)

System structuring is paramount to the development of large-scale complex hybrid systems (LCHS). However, there is no well-established and effective methodology for the structuring of LCHS. Using the approach of illustrating and abstracting, this paper ... Keywords: autonomous system, block-diagram-based model, distributed system, hierarchical system, large-scale complex hybrid system (LCHS), multiple gradation, nested system, nesting, perception–decision link, system geometry, system modelization, system structuring

Huaglory Tianfield

2001-02-01T23:59:59.000Z

75

Operations and Maintenance Manual for Large Aperture Scanner System  

Science Conference Proceedings (OSTI)

Operations and maintenance manual includes detailed instructions for system assembly, use, and maintenance.

Jones, Anthony M.; Hall, Thomas E.

2010-04-08T23:59:59.000Z

76

A large distributed control system using Ada in fusion research  

Science Conference Proceedings (OSTI)

Keywords: CORBA, application frameworks, distributed control system, levels of abstraction, object-oriented development

John P. Woodruff; Paul J. Van Arsdall

1998-11-01T23:59:59.000Z

77

Model Abstraction Techniques for Large-Scale Power Systems  

E-Print Network (OSTI)

Report on System Simulation using High Performance Computing Prepared by New Mexico Tech New Mexico: Application of High Performance Computing to Electric Power System Modeling, Simulation and Analysis Task Two

78

Comparison of emerging diagnostic tools for large commercial HVAC systems  

E-Print Network (OSTI)

contracting, design decision information, fan benchmarking,Fan Systems (UCB Tools), University of California at Berkeley, Center for Environmental Design

Friedman, Hannah; Piette, Mary Ann

2001-01-01T23:59:59.000Z

79

Energy efficiency strategies in refrigeration systems of large supermarkets  

Science Conference Proceedings (OSTI)

Energy efficiency and its relationship with sustainable development are one of the most important objectives in modern engineering systems. In Industrial Installations that use refrigeration systems that are associated with the food industry, this optimization ... Keywords: energy efficiency, optimizing parameters, refrigeration systems, supermarkets

J. M. Garcia; L. M. R. Coelho

2010-07-01T23:59:59.000Z

80

Chukwa: a system for reliable large-scale log collection  

Science Conference Proceedings (OSTI)

Large Internet services companies like Google, Yahoo, and Facebook use the MapReduce programming model to process log data. MapReduce is designed to work on data stored in a distributed filesystem like Hadoop's HDFS. As a result, a number of log collection ... Keywords: logging, research, scale

Ariel Rabkin; Randy Katz

2010-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

From a proven correct microkernel to trustworthy large systems  

Science Conference Proceedings (OSTI)

The seL4 microkernel was the world's first general-purpose operating system kernel with a formal, machine-checked proof of correctness. The next big step in the challenge of building truly trustworthy systems is to provide a framework for developing ...

June Andronick

2010-06-01T23:59:59.000Z

82

Lessons Learned: Planning and Operating Power Systems with Large  

E-Print Network (OSTI)

2007 2008 2009 Year kW 0 50 100 150 200 250 300 350 No. Installed kW No. Systems #12;2 Most to their systems powered by as-available renewable energy sources (primarily wind and solar). The Big Island also and controlled to the extent as combustion turbines, diesels or steam generators. The geothermal units on the Big

83

Evaluate error sources and uncertainty in large scale measurement systems  

Science Conference Proceedings (OSTI)

Modern manufacturing technologies place increasingly higher demands on industrial measurement systems. Over the last decade there have been rapid developments in 3D measurement systems, with the primary requirement coming from industries such as automotives, ... Keywords: Best fit methods, Laser scanner, Measurement errors, Uncertainty

Qing Wang; Nick Zissler; Roger Holden

2013-02-01T23:59:59.000Z

84

A terrestrial animal-borne video system for large mammals  

Science Conference Proceedings (OSTI)

Animal-borne video and environmental data collection systems (AVEDs) are integrated sensor systems that collect video from the animal's perspective and combine it with data from other sensors, including audio, location, temperature, acceleration, and ... Keywords: AVED, Telemetry, Video, White-tailed deer, Wildlife

Remington J. Moll; Joshua J. Millspaugh; Jeff Beringer; Joel Sartwell; Zhihai He; Jay A. Eggert; Xiwen Zhao

2009-05-01T23:59:59.000Z

85

Sealing Ducts in Large Commercial Buildings with Aerosolized Sealant  

NLE Websites -- All DOE Office Websites (Extended Search)

Sealing Ducts in Large Commercial Buildings with Aerosolized Sealant Sealing Ducts in Large Commercial Buildings with Aerosolized Sealant Particles Title Sealing Ducts in Large Commercial Buildings with Aerosolized Sealant Particles Publication Type Journal Article LBNL Report Number LBNL-42414 Year of Publication 2001 Authors Modera, Mark P., Olivier Brzozowski, François Rémi Carrié, Darryl J. Dickerhoff, William W. Delp, William J. Fisk, Ronnen M. Levinson, and Duo Wang Journal Energy & Buildings Volume 34 Start Page Chapter Pagination 705-714 Abstract Electricity energy savings potential by eliminating air leakage from ducts in large commercial buildings is on the order of 10 kWh/m2 per year (1 kWh/ft2). We have tested, in two large commercial buildings, a new technology that simultaneously seals duct leaks and measures effective leakage area of ducts. The technology is based upon injecting a fog of aerosolized sealant particles into a pressurized duct system. In brief, this process involves blocking all of the intentional openings in a duct system (e.g., diffusers). Therefore, when the system is pressurized, the only place for the air carrying the aerosol particles to exit the system is through the leaks. The key to the technology is to keep the particles suspended within the airstream until they reach the leaks, and then to have them leave the airstream and deposit on the leak sites. The principal finding from this field study was that the aerosol technology is capable of sealing the leaks in a large commercial building duct system within a reasonable time frame. In the first building, 66% of the leakage area was sealed within 2.5 hours of injection, and in the second building 86% of the leakage area was sealed within 5 hours. We also found that the aerosol could be blown through the VAV boxes in the second building without impacting their calibrations or performance. Some remaining questions are (1) how to achieve sealing rates comparable to those experienced in smaller residential systems; and (2) what tightness level these ducts systems can be brought to by means of aerosol sealing.

86

Conference on iterative methods for large linear systems  

SciTech Connect

This conference is dedicated to providing an overview of the state of the art in the use of iterative methods for solving sparse linear systems with an eye to contributions of the past, present and future. The emphasis is on identifying current and future research directions in the mainstream of modern scientific computing. Recently, the use of iterative methods for solving linear systems has experienced a resurgence of activity as scientists attach extremely complicated three-dimensional problems using vector and parallel supercomputers. Many research advances in the development of iterative methods for high-speed computers over the past forty years are reviewed, as well as focusing on current research.

Kincaid, D.R. [comp.

1988-12-01T23:59:59.000Z

87

Energy Consumption Models and Predictions for Large-Scale Systems  

Science Conference Proceedings (OSTI)

Responsible, efficient and well-planned power consumption is becoming a necessity for monetary returns and scalability of computing infrastructures. While there are numerous sources from which power data can be obtained, analyzing this data is an intrinsically ... Keywords: Energy model, Grid'5000, distrbuted systems

Taghrid Samak, Christine Morin, David Bailey

2013-05-01T23:59:59.000Z

88

Protocols for processes: programming in the large for open systems  

Science Conference Proceedings (OSTI)

The modeling and enactment of business processes is being recognized as key to modern information managment. The expansion of Web services has increased the attention given to processes, because processes are how services are composed and put to good ... Keywords: business processes, interaction protocols, open systems

Munindar P. Singh; Amit K. Chopra; Nirmit Desai; Ashok U. Mallya

2004-12-01T23:59:59.000Z

89

Virtually distortion-free imaging system for large field, high resolution lithography  

DOE Patents (OSTI)

Virtually distortion free large field high resolution imaging is performed using an imaging system which contains large field distortion or field curvature. A reticle is imaged in one direction through the optical system to form an encoded mask. The encoded mask is then imaged back through the imaging system onto a wafer positioned at the reticle position.

Hawryluk, Andrew M. (Modesto, CA); Ceglio, Natale M. (Livermore, CA)

1993-01-01T23:59:59.000Z

90

Query Routing in Large-scale Digital Library Systems  

E-Print Network (OSTI)

Modern digital libraries require user-friendly and yet responsive access to the rapidly growing, heterogeneous, and distributed collection of information sources. However, the increasing volume and diversity of digital information available online have led to a growing problem that conventional data management systems do not have, namely #nding which information sources out of many candidate choices are the most relevant to answer a given user query.We refer to this problem as the query routing problem.

Ling Liu

1997-01-01T23:59:59.000Z

91

Web-based energy information systems for large commercial buildings  

SciTech Connect

Energy Information Systems (EIS), which monitor and organize building energy consumption and related trend data over the Internet, have been evolving over the past decade. This technology helps perform key energy management functions such as organizing energy use data, identifying energy consumption anomalies, managing energy costs, and automating demand response strategies. During recent years numerous developers and vendors of EIS have been deploying these products in a highly competitive market. EIS offer various software applications and services for a variety of purposes. Costs for such system vary greatly depending on the system's capabilities and how they are marketed. Some products are marketed directly to end users while others are made available as part of electric utility programs. EIS can be a useful tool in building commissioning and retro-commissioning. This paper reviews more than a dozen EIS. We have developed an analytical framework to characterize the main features of these products, which are developed for a variety of utility programs and end-use markets. The purpose of this research is to evaluate EIS capabilities and limitations, plus examine longer-term opportunities for utilizing such technology to improve building energy efficiency and load management.

Motegi, Naoya; Piette, Mary Ann

2003-03-29T23:59:59.000Z

92

Field testing of component-level model-based fault detection methods for mixing boxes and VAV fan systems  

E-Print Network (OSTI)

based methods of fault detection and diagnosis (FDD).Component-level FDD, which is the subject of the work

Xu, Peng; Haves, Philip

2002-01-01T23:59:59.000Z

93

Field testing of component-level model-based fault detection methods for mixing boxes and VAV fan systems  

E-Print Network (OSTI)

precluded testing the fan based on design data. Since thisStatic Pressure (inWg) fan CFM SF-SP SF-SP-Design-Sim time (supply fan pressure rise) SF- DP SF-DP-Design-simulated D.

Xu, Peng; Haves, Philip

2002-01-01T23:59:59.000Z

94

Field testing of component-level model-based fault detection methods for mixing boxes and VAV fan systems  

E-Print Network (OSTI)

and diagnosis for cooling towers. ASHRAE Trans. , vol.107,of faults in the cooling tower circuit of a central chilled

Xu, Peng; Haves, Philip

2002-01-01T23:59:59.000Z

95

Field testing of component-level model-based fault detection methods for mixing boxes and VAV fan systems  

E-Print Network (OSTI)

measurement of airflow rate. Supply fan speed (0-1) SA S.A.Supply Fan test S.B.Fan pressure rise calibration SF-DP-Simulated Pressure

Xu, Peng; Haves, Philip

2002-01-01T23:59:59.000Z

96

Balancing Peer and Server Energy Consumption in Large Peer-to-Peer File Distribution Systems  

E-Print Network (OSTI)

Balancing Peer and Server Energy Consumption in Large Peer-to-Peer File Distribution Systems. This paper investigates the most energy efficient way to distribute a file to a large number of recipients] has been paid to its energy consumption. This paper considers large scale file distribution

Andrew, Lachlan

97

Towards ontologies for formalizing modularization and communication in large software systems  

Science Conference Proceedings (OSTI)

Large software systems are modularized in order to improve manageability. The parts of a software system communicate in order to achieve the desired functionality. To better understand, develop, manage, and maintain the resulting complexity, this paper ...

Daniel Oberle; Steffen Lamparter; S. Grimm; D. Vrande?i?; S. Staab; A. Gangemi

2006-04-01T23:59:59.000Z

98

A study of dynamic meta-learning for failure prediction in large-scale systems  

Science Conference Proceedings (OSTI)

Despite years of study on failure prediction, it remains an open problem, especially in large-scale systems composed of vast amount of components. In this paper, we present a dynamic meta-learning framework for failure prediction. It intends to not only ... Keywords: Blue Gene, Dynamic techniques, Failure prediction, Large-scale systems, Meta-learning

Zhiling Lan; Jiexing Gu; Ziming Zheng; Rajeev Thakur; Susan Coghlan

2010-06-01T23:59:59.000Z

99

An assessment of accountability policies for large-scale distributed computing systems  

Science Conference Proceedings (OSTI)

Grid computing systems offer resources to solve large-scale computational problems and are thus widely used in a large variety of domains, including computational sciences, energy management, and defense. Accountability in these application domains is ... Keywords: accountability, distributed systems, grid, policies, scalability

Wonjun Lee; Anna C. Squicciarini; Elisa Bertino

2009-04-01T23:59:59.000Z

100

First Light Adaptive Optics System for Large Binocular Telescope S. Espositoa  

E-Print Network (OSTI)

First Light Adaptive Optics System for Large Binocular Telescope S. Espositoa , A. Tozzia , D of the single conjugate Adaptive Optics system to be installed on the LBT telescope. This system will be located optics is supposed to start from the beginning. The Adaptive Optics system to be used in first light

Fini, Luca

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

An Operational Energy Consumption Evaluation Index System for Large Public Buildings  

E-Print Network (OSTI)

Large public buildings have been the emphasis of energy conservation in China. In this paper, the design and operational energy consumption evaluation indices for large public buildings are generalized, their differences and deficiencies are analyzed, and the evaluation indices of each kind of key equipment and the whole heating and air-conditioning system are put forward from the point of view of usage efficiency of energy. The energy consumption evaluation index system for large public buildings is primarily established. The calculation method of each kind of energy consumption evaluation index is given, which provides the foundation for further studies on energy consumption for large public buildings.

Li, Y.; Zhang, J.; Sun, D.

2006-01-01T23:59:59.000Z

102

A systemic approach to integrated E-maintenance of large engineering plants  

Science Conference Proceedings (OSTI)

Large engineering plants (LEPs) have certain unique features that necessitate a maintenance strategy that is a combination of both time and condition based maintenance. Although this requirement is appreciated to varying degrees by asset owners, applied ... Keywords: Systemic approach, availability, e-maintenance, large engineering plants, reliability

Ajit Kumar Verma; A. Srividya; P. G. Ramesh

2010-05-01T23:59:59.000Z

103

A Prototype of Wireless Power and Data Acquisition System for Large Detectors  

E-Print Network (OSTI)

A new prototype wireless data acquisition system has been developed with the intended application to read-out instrumentation systems having a large number of channels. In addition such system could be deployed in smaller detectors requiring increased mobility. The data acquisition and control system is based on 802.11n compliant hardware and protocols. In this paper we describe our case study with a single readout channel performed for a potential large detector containing photomultiplier tubes. The front-end circuitry, including a high-voltage power supply is powered wirelessly thus creating an all-wireless detector readout. The benchmarked performance of the prototype system and how a large scale implementation of the system might be realized are discussed.

P. De Lurgio; Z. Djurcic; G. Drake; R. Hashemian; A. Kreps; M. Oberling; T. Pearson; H. Sahoo

2013-10-03T23:59:59.000Z

104

Alternate Air Delivery Systems for Hot and Humid Climates  

E-Print Network (OSTI)

Carter & Burgess first began using triple deck multi-zone units, in place of traditional VAV systems, on the Texas State Capitol restoration. Since the completion of that project design in early 1991, our firm has now used triple deck multi-zone units in the Harris County Criminal Courts Building in Houston, one of the most hot and humid climates in the United States, as well as in several other facilities. This paper will discuss the adoption of ASHRAE 62, its effects on VAV systems, and how triple deck multi-zone units offer an alternative system to cooling in hot and humid climates. We recommend all design firms add triple deck multizone units to their repertoire of design solutions.

Wallace, M.

1996-01-01T23:59:59.000Z

105

Model-constrained optimization methods for reduction of parameterized large-scale systems  

E-Print Network (OSTI)

Most model reduction techniques employ a projection framework that utilizes a reduced-space basis. The basis is usually formed as the span of a set of solutions of the large-scale system, which are computed for selected ...

Bui-Thanh, Tan

2007-01-01T23:59:59.000Z

106

Towards an interpretative integrative framework to conceptualise social processes in large information systems implementations  

Science Conference Proceedings (OSTI)

This paper develops a new interpretative framework to study large information systems implementations. This framework is used to make explicit the various links between the implementation process, the wider organisation and external context. This framework ...

A.J. Salazar Alvarez

2003-10-01T23:59:59.000Z

107

Hydraulic modeling of large district cooling systems for master planning purposes  

E-Print Network (OSTI)

District Cooling Systems (DCS) have been widely applied in large institutions such as universities, government facilities, commercial districts, airports, etc. The hydraulic system of a large DCS can be complicated. They often stem from an original design that has had extensive additions and deletions over time. Expanding or retrofitting such a system involves large capital investment. Consideration of future expansion is often required. Therefore, a thorough study of the whole system at the planning phase is crucial. An effective hydraulic model for the existing DCS will become a powerful analysis tool for this purpose. Engineers can use the model to explore alternative system configurations to find an optimal way of accommodating the DCS hydraulic system to the planned future unit. This thesis presents the first complete procedure for the use of commercial simulation software to construct the hydraulic model for a large District Cooling System (DCS). A model for one of the largest DCS hydraulic systems in the United States has been developed based on this procedure and has been successfully utilized to assist its master planning study.

Xu, Chen

2003-05-01T23:59:59.000Z

108

A modified parallel optimization system for updating large-size time-evolving flow matrix  

Science Conference Proceedings (OSTI)

Flow matrices are widely used in many disciplines, but few methods can estimate them. This paper presents a knowledge-based system as capable of estimating and updating large-size time-evolving flow matrix. The system in this paper consists of two major ... Keywords: Data fusion, Parallel optimization, Time-evolving flow matrix

Ting Yu; Julien Ugon; Wei Yu

2012-07-01T23:59:59.000Z

109

Using Markov chain analysis to study dynamic behaviour in large-scale grid systems  

Science Conference Proceedings (OSTI)

In large-scale grid systems with decentralized control, the interactions of many service providers and consumers will likely lead to emergent global system behaviours that result in unpredictable, often detrimental, outcomes. This possibility argues ... Keywords: discrete Markov chain, grid computing, perturbation analysis, piece-wise homogenous Markov chain

Christopher Dabrowski; Fern Hunt

2009-01-01T23:59:59.000Z

110

Software System Design for Large Scale, Spatially-explicit Agroecosystem Modeling  

SciTech Connect

Recently, site-based agroecosystem model has been applied at regional and state level to enable comprehensive analyses of environmental sustainability of food and biofuel production. Those large-scale, spatially-explicit simulations present computational challenges in software systems design. Herein, we describe our software system design for large-scale, spatially-explicit agroecosystem modeling and data analysis. First, we describe the software design principles in three major phases: data preparation, high performance simulation, and data management and analysis. Then, we use a case study at a regional intensive modeling area (RIMA) to demonstrate our system implementation and capability.

Wang, Dali [ORNL; Nichols, Dr Jeff A [ORNL; Kang, Shujiang [ORNL; Post, Wilfred M [ORNL; Liu, Sumang [ORNL

2012-01-01T23:59:59.000Z

111

Mechanically Cooled Large-Volume Germanium Detector Systems for Nuclear Explosion Monitoring DOENA27323-1  

SciTech Connect

Compact maintenance free mechanical cooling systems are being developed to operate large volume germanium detectors for field applications. To accomplish this we are utilizing a newly available generation of Stirling-cycle mechanical coolers to operate the very largest volume germanium detectors with no maintenance. The user will be able to leave these systems unplugged on the shelf until needed. The flip of a switch will bring a system to life in ~ 1 hour for measurements. The maintenance-free operating lifetime of these detector systems will exceed 5 years. These features are necessary for remote long-duration liquid-nitrogen free deployment of large-volume germanium gamma-ray detector systems for Nuclear Explosion Monitoring. The Radionuclide Aerosol Sampler/Analyzer (RASA) will greatly benefit from the availability of such detectors by eliminating the need for liquid nitrogen at RASA sites while still allowing the very largest available germanium detectors to be reliably utilized.

Hull, E.L.

2006-07-28T23:59:59.000Z

112

The Louis Stokes Laboratories, Building 50, National Institutes...  

NLE Websites -- All DOE Office Websites (Extended Search)

VAV supply and exhaust fans, although in the pump system, the VAV terminal units are replaced by water control valves and cooling and heating coils. Differential pressure sensors...

113

Cryogenic Safety Aspect of the Low-? Magnet Systems at the Large Hadron Collider (LHC)  

E-Print Network (OSTI)

The low-? magnet systems are located in the LHC insertion regions around the four interaction points. They are the key elements in the beams focusing/defocusing process and will allow proton collisions at a luminosity of up to 1034cm-2s-1. Large radiation dose deposited at the proximity of the beam collisions dictate stringent requirements for the design and operation of the systems. The hardware commissioning phase of the LHC was completed in the winter of 2010 and permitted to validate this system safe operation. This paper presents the analysis used to qualify and quantify the safe operation of the low-? magnet systems in the Large Hadron Collider (LHC) for the first years of operation.

Darve, C

2011-01-01T23:59:59.000Z

114

Comparative guide to emerging diagnostic tools for large commercial HVAC systems  

Science Conference Proceedings (OSTI)

This guide compares emerging diagnostic software tools that aid detection and diagnosis of operational problems for large HVAC systems. We have evaluated six tools for use with energy management control system (EMCS) or other monitoring data. The diagnostic tools summarize relevant performance metrics, display plots for manual analysis, and perform automated diagnostic procedures. Our comparative analysis presents nine summary tables with supporting explanatory text and includes sample diagnostic screens for each tool.

Friedman, Hannah; Piette, Mary Ann

2001-05-01T23:59:59.000Z

115

The Protection System for the Superconducting Elements of the Large Hadron Collider at CERN  

E-Print Network (OSTI)

The protection system for the superconducting elements of the Large Hadron Collider (LHC) [1] at the European Laboratory for Particle Physics (CERN), and its associated equipment are presented: quench detectors, cold diodes, quench heaters and related power supplies, extraction resistors and associated current breakers. Features such as radiation resistance, redundancy and required reliability are discussed.

Dahlerup-Petersen, K; Gómez-Costa, J L; Hagedorn, Dietrich; Proudlock, Paul; Rodríguez-Mateos, F; Schmidt, R; Sonnemann, F

1999-01-01T23:59:59.000Z

116

An automatic water management system for large-scale rice paddy fields  

Science Conference Proceedings (OSTI)

An automatic water management system for large-scale paddy fields has been developed. The purposes of that are to supply the paddy fields with water or drain water from that automatically, to decrease water consumption, and to have a good harvest. To ... Keywords: estimating mean water level, optimal water allocation, paddy field, predict field consumption, prediction of growth stages, water level control

Teruji Sekozawa

2010-10-01T23:59:59.000Z

117

MicroTCA implementation of synchronous Ethernet-Based DAQ systems for large scale experiments  

E-Print Network (OSTI)

the form of a tank filled with liquid Argon maintained at about 87 °K by a cryogenic system. An electric the calculation of the track coordinates in 2 dimensions. The third dimension is given by the measurement software. Proposals of such very large scale Liquid Argon Detector foresee the use of Liquefied Natural Gas

Paris-Sud XI, Université de

118

Large-scale Probabilistic Forecasting in Energy Systems using Sparse Gaussian Conditional Random Fields  

E-Print Network (OSTI)

pricing. Although it is known that probabilistic forecasts (which give a distribution over possible futureLarge-scale Probabilistic Forecasting in Energy Systems using Sparse Gaussian Conditional Random Fields Matt Wytock and J. Zico Kolter Abstract-- Short-term forecasting is a ubiquitous practice

Kolter, J. Zico

119

Application of EPRI's Transmission Reliability Evaluation for Large-Scale Systems (TRELSS) Program to Bonneville Power Administration System  

Science Conference Proceedings (OSTI)

Delivering power at the lowest cost while maintaining an acceptable level of reliability requires careful transmission planning. EPRI's Transmission Reliability Evaluation for Large-Scale Systems (TRELSS) can be used to analyze and quantify the reliability of bulk power systems to help determine the need for new transmission facilities. This report presents the results of reliability analyses for Bonneville Power Administration (BPA) using the TRELSS program.

1997-11-11T23:59:59.000Z

120

Construction program for a large superconducting MHD magnet system at the coal-fired flow facility  

DOE Green Energy (OSTI)

The Argonne National Laboratory has designed and is constructing a 6 T large aperture superconducting MHD magnet for use in the Coal-Fired Flow Facility (CFFF) at the University of Tennessee Space Institute (UTSI) at Tullahoma, Tennessee. The magnet system consists of the superconducting magnet, a magnet power supply, an integrated instrumentation for operation, control and protection, and a complete cryogenic facility including a CTI Model 2800 helium refrigerator/liquefier with two compressors, helium gas handling system and a 7500 liter liquid helium dewar. The complete system will be tested at Argonne, IL in 1981. The magnet design is reviewed, and the coil fabrication programs are described in detail.

Wang, S.T.; Genens, L.; Gonczy, J.; Ludwig, H.; Lieberg, M.; Kraft, E.; Gacek, D.; Huang, Y.C.; Chen, C.J.

1980-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Large Matched-Index-of-Refraction (MIR) Flow Systems for International Collaboration In Fluid Mechanics  

SciTech Connect

In recent international collaboration, INL and Uni. Erlangen have developed large MIR flow systems which can be ideal for joint graduate student education and research. The benefit of the MIR technique is that it permits optical measurements to determine flow characteristics in complex passages and around objects to be obtained without locating a disturbing transducer in the flow field and without distortion of the optical paths. The MIR technique is not new itself; others employed it earlier. The innovation of these MIR systems is their large size relative to previous experiments, yielding improved spatial and temporal resolution. This report will discuss the benefits of the technique, characteristics of the systems and some examples of their applications to complex situations. Typically their experiments have provided new fundamental understanding plus benchmark data for assessment and possible validation of computational thermal fluid dynamic codes.

Donald M. McEligot; Stefan Becker; Hugh M. McIlroy, Jr.

2010-07-01T23:59:59.000Z

122

Engineering Systems Matrix: An organizing framework for modeling large-scale complex systems  

E-Print Network (OSTI)

The scope and complexity of engineered systems are ever-increasing as burgeoning global markets, unprecedented technological capabilities, rising consumer expectations, and ever-changing social requirements present difficult ...

Bartolomei, Jason E.

123

S30-A2-02 PROPOSAL OF UNIQUE PV SYSTEM FOR LARGE-SCALE PHOTOVOLTAIC POWER GENERATION SYSTEM  

E-Print Network (OSTI)

In order to make a PV power generation system survive as an economically viable option against other renewable energy sources, drastic reduction of energy cost is inevitable. The authors have been working on the development of a unique PV system to reduce total system cost including solar panel, power conversion unit and installation work [I]. In the proposed concept, AC photovoltaic device and adhesive mounting method were introduced for the dedicated use in power station. By introducing this concept, it is feasible that the system cost will be reduced to 113 compared to the conventional system. The authors believe that the concept is suitable for very large-scale PV systems in desert areas. 1.

Kimitoshi Fukae; Akiharu Takabayashi; Shigenori Itoyama; Ichiro Kataoka; Hidehisa Makita; Masaaki Matsushita; Takaaki Mukai; Nobuyoshi Takehara; Masaki Konishi

2003-01-01T23:59:59.000Z

124

Mechanically Cooled Large-Volume Germanium Detector Systems for Neclear Explosion Monitoring DOENA27323-2  

Science Conference Proceedings (OSTI)

Compact maintenance free mechanical cooling systems are being developed to operate large volume high-resolution gamma-ray detectors for field applications. To accomplish this we are utilizing a newly available generation of Stirling-cycle mechanical coolers to operate the very largest volume germanium detectors with no maintenance. The user will be able to leave these systems unplugged on the shelf until needed. The maintenance-free operating lifetime of these detector systems will exceed 5 years. Three important factors affect the operation of mechanically cooled germanium detectors: temperature, vacuum, and vibration. These factors will be studied in the laboratory at the most fundamental levels to insure a solid understanding of the physical limitations each factor places on a practical mechanically cooled germanium detector system. Using this knowledge, mechanically cooled germanium detector prototype systems will be designed and fabricated.

Hull, E.L.

2006-10-30T23:59:59.000Z

125

Rule-Based Energy Management System Applied to Large Industrial Facilities  

E-Print Network (OSTI)

Deregulation of electricity and rising fuel costs are causing renewed interest in Energy Management Systems (EMS). This paper details the results of integrating a rule-based EMS controller at a Pulp and Paper Mill and additional findings from several other large industrial power complexes. It is a PC-based supervisory system that is interfaced to a Distributed Control System (DCS). The EMS has been applied on powerhouse complexes as large as 433 MW of electricity and 7500 KPPH of steam. The EMS may, as required, include boiler load allocation, steam turbine load allocation, combustion turbine and HRSG load allocation, real-time pricing (RTP) tie-line control, coordinated header pressure control, bus voltage and plant power factor control and electric and steam economic load shed systems. It optimizes the powerhouse operations to meet rapidly changing steam and electrical requirements of the plant at minimum cost subject to all of the operating constraints imposed on the generation equipment. Steady state optimization methods, such as linear and non-linear programming, are not suited for on line optimization of power complex operations since the process is rarely in steady state. Instead, it is critical to control the trajectory of the power generation for optimal steam and electric moves while satisfying multiple constraints. The optimization strategy applied here is reduced to a fairly small number of prioritized rules. It has proven itself capable of optimizing large powerhouse complexes while keeping the powerhouse and process units within a safe operating envelop.

Gauthier, M.; Childress, R. L.

2001-05-01T23:59:59.000Z

126

System support for resilience in large-scale parallel systems: from checkpointing to mapreduce  

Science Conference Proceedings (OSTI)

High-Performance Computing (HPC) has passed the Petascale mark and is moving forward to Exascale. As the system ensemble size continues to grow, the occurrence of failures is the norm rather than the exception during the execution of parallel applications. ...

Hui Jin / Xian-He Sun

2012-01-01T23:59:59.000Z

127

A Tutorial on Detection and Characterization of Special Behavior in Large Electric Power Systems  

SciTech Connect

The objective of this document is to report results in the detection and characterization of special behavior in large electric power systems. Such behavior is usually dynamic in nature, but not always. This is also true for the underlying sources of special behavior. At the device level, a source of special behavior might be an automatic control system, a dynamic load, or even a manual control system that is operated according to some sharply defined policy. Other possible sources include passive system conditions, such as the state of a switched device or the amount of power carried on some critical line. Detection and characterization are based upon “signature information” that is extracted from the behavior observed. Characterization elements include the signature information itself, the nature of the behavior and its likely causes, and the associated implications for the system or for the public at large. With sufficient data and processing, this characterization may directly identify a particular condition or device at a specific location. Such conclusive results cannot always be done from just one observation, however. Information environments that are very sparse may require multiple observations, comparative model studies, and even direct testing of the system.

Hauer, John F.; DeSteese, John G.

2004-08-20T23:59:59.000Z

128

Thermal plant outages in a large hydro-thermal power supply system a method in probabilistic simulation  

Science Conference Proceedings (OSTI)

The advent of large computers has made a significant impact upon decision theory with their ability to generate a large number of simulations within a relatively short period of time. Better estimates of a system's capabilities and parameters can be ...

Charles W. Eastwood

1980-01-01T23:59:59.000Z

129

A Method to Determine Reserve Requirements for Large-Scale Renewable Integration: A Platform for Large-Scale Power Systems  

Science Conference Proceedings (OSTI)

The main industry issue addressed in this report is the increasing penetration of intermittent generation. The system adaptation for forecasting errors associated with these types of generation is to increase reserve requirements, and the adaptation for their ramping characteristics is to diversify the portfolio of complementary dispatch resources. For small quantities of intermittent generation, there is no noticeable system impact8212but at some point their forecasting errors and ramping begin to affec...

2009-12-18T23:59:59.000Z

130

MPI-hybrid Parallelism for Volume Rendering on Large, Multi-core Systems  

Science Conference Proceedings (OSTI)

This work studies the performance and scalability characteristics of"hybrid'" parallel programming and execution as applied to raycasting volume rendering -- a staple visualization algorithm -- on a large, multi-core platform. Historically, the Message Passing Interface (MPI) has become the de-facto standard for parallel programming and execution on modern parallel systems. As the computing industry trends towards multi-core processors, with four- and six-core chips common today and 128-core chips coming soon, we wish to better understand how algorithmic and parallel programming choices impact performance and scalability on large, distributed-memory multi-core systems. Our findings indicate that the hybrid-parallel implementation, at levels of concurrency ranging from 1,728 to 216,000, performs better, uses a smaller absolute memory footprint, and consumes less communication bandwidth than the traditional, MPI-only implementation.

Howison, Mark; Bethel, E. Wes; Childs, Hank

2010-03-20T23:59:59.000Z

131

Hybrid Parallelism for Volume Rendering on Large, Multi-core Systems  

Science Conference Proceedings (OSTI)

This work studies the performance and scalability characteristics of"hybrid'"parallel programming and execution as applied to raycasting volume rendering -- a staple visualization algorithm -- on a large, multi-core platform. Historically, the Message Passing Interface (MPI) has become the de-facto standard for parallel programming and execution on modern parallel systems. As the computing industry trends towards multi-core processors, with four- and six-core chips common today and 128-core chips coming soon, we wish to better understand how algorithmic and parallel programming choices impact performance and scalability on large, distributed-memory multi-core systems. Our findings indicate that the hybrid-parallel implementation, at levels of concurrency ranging from 1,728 to 216,000, performs better, uses a smaller absolute memory footprint, and consumes less communication bandwidth than the traditional, MPI-only implementation.

Howison, Mark; Bethel, E. Wes; Childs, Hank

2010-07-12T23:59:59.000Z

132

Hybrid Parallelism for Volume Rendering on Large, Multi-core Systems  

SciTech Connect

This work studies the performance and scalability characteristics of"hybrid" parallel programming and execution as applied to raycasting volume rendering -- a staple visualization algorithm -- on a large, multi-core platform. Historically, the Message Passing Interface (MPI) has become the de-facto standard for parallel programming and execution on modern parallel systems. As the computing industry trends towards multi-core processors, with four- and six-core chips common today and 128-core chips coming soon, we wish to better understand how algorithmic and parallel programming choices impact performance and scalability on large, distributed-memory multi-core systems. Our findings indicate that the hybrid-parallel implementation, at levels of concurrency ranging from 1,728 to 216,000, performs better, uses a smaller absolute memory footprint, and consumes less communication bandwidth than the traditional, MPI-only implementation.

Howison, Mark; Bethel, E. Wes; Childs, Hank

2010-06-14T23:59:59.000Z

133

Solving Large Sparse Linear Systems in End-to-end Accelerator Structure Simulations  

Science Conference Proceedings (OSTI)

This paper presents a case study of solving very large sparse linear systems in end-to-end accelerator structure simulations. Both direct solvers and iterative solvers are investigated. A parallel multilevel preconditioner based on hierarchical finite element basis functions is considered and has been implemented to accelerate the convergence of iterative solvers. A linear system with matrix size 93,147,736 and with 3,964,961,944 non-zeros from 3D electromagnetic finite element discretization has been solved in less than 8 minutes with 1024 CPUs on the NERSC IBM SP. The resource utilization as well as the application performance for these solvers is discussed.

Lee, L

2004-01-23T23:59:59.000Z

134

Fail-Safe Design for Large Capacity Lithium-Ion Battery Systems  

Science Conference Proceedings (OSTI)

A fault leading to a thermal runaway in a lithium-ion battery is believed to grow over time from a latent defect. Significant efforts have been made to detect lithium-ion battery safety faults to proactively facilitate actions minimizing subsequent losses. Scaling up a battery greatly changes the thermal and electrical signals of a system developing a defect and its consequent behaviors during fault evolution. In a large-capacity system such as a battery for an electric vehicle, detecting a fault signal and confining the fault locally in the system are extremely challenging. This paper introduces a fail-safe design methodology for large-capacity lithium-ion battery systems. Analysis using an internal short circuit response model for multi-cell packs is presented that demonstrates the viability of the proposed concept for various design parameters and operating conditions. Locating a faulty cell in a multiple-cell module and determining the status of the fault's evolution can be achieved using signals easily measured from the electric terminals of the module. A methodology is introduced for electrical isolation of a faulty cell from the healthy cells in a system to prevent further electrical energy feed into the fault. Experimental demonstration is presented supporting the model results.

Kim, G. H.; Smith, K.; Ireland, J.; Pesaran, A.

2012-07-15T23:59:59.000Z

135

Improving Performance of Power Systems with Large-scale Variable Generation Additions  

Science Conference Proceedings (OSTI)

A power system with large-scale renewable resources, like wind and solar generation, creates significant challenges to system control performance and reliability characteristics because of intermittency and uncertainties associated with variable generation. It is important to quantify these uncertainties, and then incorporate this information into decision-making processes and power system operations. This paper presents three approaches to evaluate the flexibility needed from conventional generators and other resources in the presence of variable generation as well as provide this flexibility from a non-traditional resource – wide area energy storage system. These approaches provide operators with much-needed information on the likelihood and magnitude of ramping and capacity problems, and the ability to dispatch available resources in response to such problems.

Makarov, Yuri V.; Etingov, Pavel V.; Samaan, Nader A.; Lu, Ning; Ma, Jian; Subbarao, Krishnappa; Du, Pengwei; Kannberg, Landis D.

2012-07-22T23:59:59.000Z

136

P.: Quick simulation methods for estimating the unreliability of regenerative models of large highly reliable systems  

E-Print Network (OSTI)

We investigate fast simulation techniques for estimating the unreliability in large Markovian models of highly reliable systems for which analytical0numerical techniques are difficult to apply+ We first show mathematically that for “small ” time horizons, the relative simulation error, when using the importance sampling techniques of failure biasing and forcing, remains bounded as component failure rates tend to zero+ This is in contrast to naive simulation where the relative error tends to infinity+ For “large ” time horizons where these techniques are not efficient, we use the approach of first bounding the unreliability in terms of regenerative-cycle-based measures and then estimating the regenerative-cycle-based measures using importance sampling; the latter can be done very efficiently+ We first use bounds developed in the literature for the asymptotic distribution of the time to hitting a rare set in regenerative systems+ However, these bounds are “close ” to the unreliability only for a certain range of time horizons+ We develop new bounds that make use of the special structure of the systems that we consider and are “close ” to the unreliability for a much wider range of time horizons+ These techniques extend to non-Markovian, highly reliable systems as long as the regenerative structure is preserved+ © 2004 Cambridge University Press 0269-9648004 $16+00 339340 M. K. Nakayama and P. Shahabuddin 1.

Marvin K. Nakayama; Perwez Shahabuddin

2004-01-01T23:59:59.000Z

137

Further advancements for large area-detector based computed tomography system  

SciTech Connect

We present advancements made to a large area-detector based system for industrial x-ray computed tomography. Past performance improvements in data acquisition speeds were made by use of high-resolution large area, flat-panel amorphous-silicon (a-Si) detectors. The detectors have proven, over several years, to be a robust alternative to CCD-optics and image intensifier CT systems. These detectors also provide the advantage of area detection as compared with the single slice geometry of linear array systems. New advancements in this system include parallel processing of sinogram reconstructions, improved visualization software and migration to frame-rate a-Si detectors. Parallel processing provides significant speed improvements for data reconstruction, and is implemented for parallel-beam, fan-beam and Feldkamp cone-beam reconstruction algorithms. Reconstruction times are reduced by an order of magnitude by use of a cluster of ten or more equal-speed computers. Advancements in data visualization are made through interactive software, which allows interrogation of the full three-dimensional dataset. Inspection examples presented in this paper include an electromechanical device, a nonliving biological specimen and a press-cast plastic specimen. We also present a commonplace item for the benefit of the layperson.

Davis, A. W. (Anthony W.); Keating, S. C. (Scott C.); Claytor, T. N. (Thomas N.)

2001-01-01T23:59:59.000Z

138

Coordinate-Space Hartree-Fock-Bogoliubov Solvers for Superfluid Fermi Systems in Large Boxes  

SciTech Connect

The self-consistent Hartree-Fock-Bogoliubov problem in large boxes can be solved accurately in the coordinate space with the recently developed solvers HFB-AX (2D) and MADNESS-HFB (3D). This is essential for the description of superfluid Fermi systems with complicated topologies and significant spatial extend, such as fissioning nuclei, weakly-bound nuclei, nuclear matter in the neutron star rust, and ultracold Fermi atoms in elongated traps. The HFB-AX solver based on B-spline techniques uses a hybrid MPI and OpenMP programming model for parallel computation for distributed parallel computation, within a node multi-threaded LAPACK and BLAS libraries are used to further enable parallel calculations of large eigensystems. The MADNESS-HFB solver uses a novel multi-resolution analysis based adaptive pseudo-spectral techniques to enable fully parallel 3D calculations of very large systems. In this work we present benchmark results for HFB-AX and MADNESS-HFB on ultracold trapped fermions.

Pei, J. C. [University of Tennessee (UTK) and Oak Ridge National Laboratory (ORNL); Fann, George I [ORNL; Harrison, Robert J [ORNL; Nazarewicz, W. [University of Tennessee (UTK) and Oak Ridge National Laboratory (ORNL); Hill, Judith C [ORNL; Galindo, Diego A [ORNL; Jia, Jun [ORNL

2012-01-01T23:59:59.000Z

139

Reverse Computation for Rollback-based Fault Tolerance in Large Parallel Systems  

SciTech Connect

Reverse computation is presented here as an important future direction in addressing the challenge of fault tolerant execution on very large cluster platforms for parallel computing. As the scale of parallel jobs increases, traditional checkpointing approaches suffer scalability problems ranging from computational slowdowns to high congestion at the persistent stores for checkpoints. Reverse computation can overcome such problems and is also better suited for parallel computing on newer architectures with smaller, cheaper or energy-efficient memories and file systems. Initial evidence for the feasibility of reverse computation in large systems is presented with detailed performance data from a particle simulation scaling to 65,536 processor cores and 950 accelerators (GPUs). Reverse computation is observed to deliver very large gains relative to checkpointing schemes when nodes rely on their host processors/memory to tolerate faults at their accelerators. A comparison between reverse computation and checkpointing with measurements such as cache miss ratios, TLB misses and memory usage indicates that reverse computation is hard to ignore as a future alternative to be pursued in emerging architectures.

Perumalla, Kalyan S [ORNL; Park, Alfred J [ORNL

2013-01-01T23:59:59.000Z

140

Solving large-scale sparse eigenvalue problems and linear systems of equations for accelerator modeling  

SciTech Connect

The solutions of sparse eigenvalue problems and linear systems constitute one of the key computational kernels in the discretization of partial differential equations for the modeling of linear accelerators. The computational challenges faced by existing techniques for solving those sparse eigenvalue problems and linear systems call for continuing research to improve on the algorithms so that ever increasing problem size as required by the physics application can be tackled. Under the support of this award, the filter algorithm for solving large sparse eigenvalue problems was developed at Stanford to address the computational difficulties in the previous methods with the goal to enable accelerator simulations on then the world largest unclassified supercomputer at NERSC for this class of problems. Specifically, a new method, the Hemitian skew-Hemitian splitting method, was proposed and researched as an improved method for solving linear systems with non-Hermitian positive definite and semidefinite matrices.

Gene Golub; Kwok Ko

2009-03-30T23:59:59.000Z

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

The role of integrability in a large class of physical systems  

E-Print Network (OSTI)

A large class of physical systems involves the vanishing of a 1-form on a manifold as a constraint on the acceptable states. This means that one is always dealing with the Pfaff problem in those cases. In particular, knowing the degree of integrability of the 1-form is often essential, or, what amounts to the same thing, its canonical (i.e., normal) form. This paper consists of two parts: In the first part, the Pfaff problem is presented and discussed in a largely mathematical way, and in the second part, the mathematical generalities thus introduced are applied to various physical models in which the normal form of a 1-form has already been implicitly introduced, such as non-conservative forces, linear non-holonomic constraints, the theory of vortices and equilibrium thermodynamics. The role of integrability in the conservation of energy is a recurring theme.

David Delphenich

2012-10-14T23:59:59.000Z

142

Energy Efficiency of large Cryogenic Systems: the LHC Case and Beyond  

E-Print Network (OSTI)

Research infrastructures for high-energy and nuclear physics, nuclear fusion and production of high magnetic fields are increasingly based on applied superconductivity and associated cryogenics in their quest for scientific breakthroughs at affordable capital and operation costs, a condition for their acceptance and sustained funding by society. The thermodynamic penalty for operating at low temperature makes energy efficiency a key requirement for their large cryogenic systems, from conceptual design to procurement, construction and operation. Meeting this requirement takes a combined approach on several fronts in parallel: management of heat loads and sizing of cooling duties, distribution of cooling power matching the needs of the superconducting devices, efficient production of refrigeration, optimal control resting on precise instrumentation and diagnostics, as well as a targeted industrial procurement policy. The case of the Large Hadron Collider (LHC) at CERN is presented. Potential improvements for fu...

Claudet, S; Ferlin, G; Lebrun, P; Tavian, L; Wagner, U

2013-01-01T23:59:59.000Z

143

Examining Food Risk in the Large using a Complex, Networked System-of-sytems Approach  

SciTech Connect

The food production infrastructure is a highly complex system of systems. Characterizing the risks of intentional contamination in multi-ingredient manufactured foods is extremely challenging because the risks depend on the vulnerabilities of food processing facilities and on the intricacies of the supply-distribution networks that link them. A pure engineering approach to modeling the system is impractical because of the overall system complexity and paucity of data. A methodology is needed to assess food contamination risk 'in the large', based on current, high-level information about manufacturing facilities, corrunodities and markets, that will indicate which food categories are most at risk of intentional contamination and warrant deeper analysis. The approach begins by decomposing the system for producing a multi-ingredient food into instances of two subsystem archetypes: (1) the relevant manufacturing and processing facilities, and (2) the networked corrunodity flows that link them to each other and consumers. Ingredient manufacturing subsystems are modeled as generic systems dynamics models with distributions of key parameters that span the configurations of real facilities. Networks representing the distribution systems are synthesized from general information about food corrunodities. This is done in a series of steps. First, probability networks representing the aggregated flows of food from manufacturers to wholesalers, retailers, other manufacturers, and direct consumers are inferred from high-level approximate information. This is followed by disaggregation of the general flows into flows connecting 'large' and 'small' categories of manufacturers, wholesalers, retailers, and consumers. Optimization methods are then used to determine the most likely network flows consistent with given data. Vulnerability can be assessed for a potential contamination point using a modified CARVER + Shock model. Once the facility and corrunodity flow models are instantiated, a risk consequence analysis can be performed by injecting contaminant at chosen points in the system and propagating the event through the overarching system to arrive at morbidity and mortality figures. A generic chocolate snack cake model, consisting of fluid milk, liquid eggs, and cocoa, is described as an intended proof of concept for multi-ingredient food systems. We aim for an eventual tool that can be used directly by policy makers and planners.

Ambrosiano, John [Los Alamos National Laboratory; Newkirk, Ryan [U OF MINNESOTA; Mc Donald, Mark P [VANDERBILT U

2010-12-03T23:59:59.000Z

144

Large Hybrid Energy Systems for Making Low CO2 Load-Following Power and Synthetic Fuel  

SciTech Connect

Hybrid energy systems using nuclear heat sources can economically produce load-following electrical power by exploiting the surplus generation capacity available at night or seasonally to make synthetic fuel. Vehicle fuel is the only current energy use large enough to absorb all the energy capacity that might be diverted from the power industry, and its ease of storage obviates problems with discontinuous synfuel production. The potential benefits and challenges of synfuels integration are illustrated by the production of methanol from natural gas (as a source of carbon) using steam from a light water nuclear power reactor which is assumed to be available in accord with a year's worth of power demand data. Methanol's synthesis process is easily adapted to using 300 C heat from a light water reactor and this simple compound can be further processed into gasoline, biodiesel, or dimethyl ether, fuels which can be used with the current vehicle fleet. A supplemental feed to the methanol process of natural gas (for energy) allows operation at constant full rate when the nuclear heat is being used to produce electrical power. The higher capital costs of such a system are offset by a lower cost of heat and power production from a large base load type of plant and by reduced costs associated with much lower CO2 emissions. Other less tangible economic benefits of this and similar hybrid systems include better use of natural resource for fuels and greater energy services security from the domestic production of vehicle fuel.

Robert S. Cherry; Richard D. Boardman; Steven Aumeier

2012-02-01T23:59:59.000Z

145

Development of models and methods for the molecular simulation of large systems and molecules  

E-Print Network (OSTI)

The most important factor for quantitative results in molecular dynamics simulation are well developed force fields and models. In the present work, the development of new models and the usage of force fields from the literature in large systems are presented. Both tasks lead to time consuming simulations that require massively parallel high performance computing. In the present work, new models for carbon dioxide and cyclohexanolare discussed and a new method for the model development is introduced. Force fields and models for the simulation of PNIPAAm hydrogel in pure water and sodium chloride solution are tested and verified and applied to the simulation of nucleation processes.

Walter, Jonathan; Horsch, Martin; Vrabec, Jadran; Hasse, Hans

2010-01-01T23:59:59.000Z

146

Mesoscale Convective Systems in Weakly Forced Large-Scale Environments. Part II: Generation of a Mesoscale Initial Condition  

Science Conference Proceedings (OSTI)

A series of five mesoscale convective systems (MCSs) developed within a weakly forced large-scale environment on 11 and 12 May 1982. Two of these systems had a large component of motion against the midtroposphoric flow and propagated in a ...

David J. Stensrud; J. Michael Fritsch

1994-09-01T23:59:59.000Z

147

Mesoscale Convective Systems in Weakly Forced Large-Scale Environments. Part III: Numerical Simulations and Implications for Operational Forecasting  

Science Conference Proceedings (OSTI)

During a 24-h period, beginning 1200 UTC 11 May 1982, a series of mesoscale convective systems developed within a weakly forced large-scale environment. Two of these systems had a large component of motion against the midtropospheric flow and ...

David J. Stensrud; J. Michael Fritsch

1994-09-01T23:59:59.000Z

148

Instrumentation status of the low-b magnet systems at the Large Hadron Collider (LHC)  

SciTech Connect

The low-{beta} magnet systems are located in the Large Hadron Collider (LHC) insertion regions around the four interaction points. They are the key elements in the beams focusing/defocusing process allowing proton collisions at luminosity up to 10{sup 34}cm{sup -2}s{sup -1}. Those systems are a contribution of the US-LHC Accelerator project. The systems are mainly composed of the quadrupole magnets (triplets), the separation dipoles and their respective electrical feed-boxes (DFBX). The low-{beta} magnet systems operate in an environment of extreme radiation, high gradient magnetic field and high heat load to the cryogenic system due to the beam dynamic effect. Due to the severe environment, the robustness of the diagnostics is primordial for the operation of the triplets. The hardware commissioning phase of the LHC was completed in February 2010. In the sake of a safer and more user-friendly operation, several consolidations and instrumentation modifications were implemented during this commissioning phase. This paper presents the instrumentation used to optimize the engineering process and operation of the final focusing/defocusing quadrupole magnets for the first years of operation.

Darve, C.; /Fermilab; Balle, C.; Casas-Cubillos, J.; Perin, A.; Vauthier, N.; /CERN

2011-05-01T23:59:59.000Z

149

Point of Collapse and Continuation Methods for Large AC/DC Systems  

E-Print Network (OSTI)

This paper describes the implementation of both Point of Collapse (PoC) methods and continuation methods for the computation of voltage collapse points (saddle-node bifurcations) in large ac/dc systems. A comparison of the performance of these methods is presented for real systems of up to 2158 buses. The paper discusses computational details of the implementation of the PoC and continuation methods, and the unique challenges encountered due to the presence of high voltage direct current (HVDC) transmission, area interchange power control, regulating transformers, and voltage and reactive power limits. The characteristics of a robust PoC power ow program are presented, and its application to detection and solution of voltage stability problems is demonstrated.

Claudio A. Cañizares; Fernando L. Alvarado

1993-01-01T23:59:59.000Z

150

Conceptual Framework and Levels of Abstraction for a Complex Large-Scale System  

SciTech Connect

A conceptual framework and levels of abstraction are created to apply across all potential threats. Bioterrorism is used as a complex example to describe the general framework. Bioterrorism is unlimited with respect to the use of a specific agent, mode of dissemination, and potential target. Because the threat is open-ended, there is a strong need for a common, systemic understanding of attack scenarios related to bioterrorism. In recognition of this large-scale complex problem, systems are being created to define, design and use the proper level of abstraction and conceptual framework in bioterrorism. The wide variety of biological agents and delivery mechanisms provide an opportunity for dynamic scale changes by the linking or interlinking of existing threat components. Concurrent impacts must be separated and evaluated in terms of a given environment and/or ‘abstraction framework.’

Simpson, Mary J.

2005-03-23T23:59:59.000Z

151

Processing large sensor data sets for safeguards : the knowledge generation system.  

SciTech Connect

Modern nuclear facilities, such as reprocessing plants, present inspectors with significant challenges due in part to the sheer amount of equipment that must be safeguarded. The Sandia-developed and patented Knowledge Generation system was designed to automatically analyze large amounts of safeguards data to identify anomalous events of interest by comparing sensor readings with those expected from a process of interest and operator declarations. This paper describes a demonstration of the Knowledge Generation system using simulated accountability tank sensor data to represent part of a reprocessing plant. The demonstration indicated that Knowledge Generation has the potential to address several problems critical to the future of safeguards. It could be extended to facilitate remote inspections and trigger random inspections. Knowledge Generation could analyze data to establish trust hierarchies, to facilitate safeguards use of operator-owned sensors.

Thomas, Maikel A.; Smartt, Heidi Anne; Matthews, Robert F.

2012-04-01T23:59:59.000Z

152

Development of Energy Consumption Database Management System of Existing Large Public Buildings  

E-Print Network (OSTI)

The statistic data of energy consumption are the base of analyzing energy consumption. The scientific management method of energy consumption data and the development of database management system plays an important role in building energy conservation. At present, the large public buildings have been the emphasis of building energy conservation in China. The functions and the basic construction of energy consumption database management system (ECDBMS) for large public buildings are introduced. The ECDBMS is developed by using SQL Server 2000 as the database and PowerBuilder10.0 as the developing tool. It includes five parts such as the basic information of public buildings, the designing parameters of energy-consuming equipments, the operational parameters of energy-consuming equipments, the electric and fuel consumption of buildings, the evaluation of energy efficiency for equipments. The energy consumption database can be accumulated and some functions can be realized by using this database such as the management of building designing parameters and energy consumption data, the evaluation and analysis of building energy consumption.

Li, Y.; Zhang, J.; Sun, D.

2006-01-01T23:59:59.000Z

153

The Local Helium Compound Transfer Lines for the Large Hadron Collider Cryogenic System  

E-Print Network (OSTI)

The cryogenic system for the Large Hadron Collider (LHC) under construction at CERN will include twelve new local helium transfer lines distributed among five LHC points in underground caverns. These lines, being manufactured and installed by industry, will connect the cold boxes of the 4.5-K refrigerators and the 1.8-K refrigeration units to the cryogenic interconnection boxes. The lines have a maximum of 30-m length and may possess either small or large re-distribution units to allow connection to the interface ports. Due to space restrictions the lines may have complex routings and require several elbowed sections. The lines consist of a vacuum jacket, a thermal shield and either three or four helium process pipes. Specific internal and external supporting and compensation systems were designed for each line to allow for thermal contraction of the process pipes (or vacuum jacket, in case of a break in the insulation vacuum) and to minimise the forces applied to the interface equipment. Whenever possible, f...

Parente, C; Munday, A; Wiggins, P

2006-01-01T23:59:59.000Z

154

TRANSIENT ACCIDENT ANALYSIS OF THE GLOVEBOX SYSTEM IN A LARGE PROCESS ROOM  

DOE Green Energy (OSTI)

Local transient hydrogen concentrations were evaluated inside a large process room when the hydrogen gas was released by three postulated accident scenarios associated with the process tank leakage and fire leading to a loss of gas confinement. The three cases considered in this work were fire in a room, loss of confinement from a process tank, and loss of confinement coupled with fire event. Based on these accident scenarios in a large and unventilated process room, the modeling calculations of the hydrogen migration were performed to estimate local transient concentrations of hydrogen due to the sudden leakage and release from a glovebox system associated with the process tank. The modeling domain represented the major features of the process room including the principal release or leakage source of gas storage system. The model was benchmarked against the literature results for key phenomena such as natural convection, turbulent behavior, gas mixing due to jet entrainment, and radiation cooling because these phenomena are closely related to the gas driving mechanisms within a large air space of the process room. The modeling results showed that at the corner of the process room, the gas concentrations migrated by the Case 2 and Case 3 scenarios reached the set-point value of high activity alarm in about 13 seconds, while the Case 1 scenario takes about 90 seconds to reach the concentration. The modeling results were used to estimate transient radioactive gas migrations in an enclosed process room installed with high activity alarm monitor when the postulated leakage scenarios are initiated without room ventilation.

Lee, S

2008-01-11T23:59:59.000Z

155

Virtually distortion-free imaging system for large field, high resolution lithography using electrons, ions or other particle beams  

DOE Patents (OSTI)

Virtually distortion free large field high resolution imaging is performed using an imaging system which contains large field distortion or field curvature. A reticle is imaged in one direction through the optical system to form an encoded mask. The encoded mask is then imaged back through the imaging system onto a wafer positioned at the reticle position. Particle beams, including electrons, ions and neutral particles, may be used as well as electromagnetic radiation.

Hawryluk, Andrew M. (Modesto, CA); Ceglio, Natale M. (Livermore, CA)

1993-01-01T23:59:59.000Z

156

Virtually distortion-free imaging system for large field, high resolution lithography using electrons, ions or other particle beams  

DOE Patents (OSTI)

Virtually distortion free large field high resolution imaging is performed using an imaging system which contains large field distortion or field curvature. A reticle is imaged in one direction through the optical system to form an encoded mask. The encoded mask is then imaged back through the imaging system onto a wafer positioned at the reticle position. Particle beams, including electrons, ions and neutral particles, may be used as well as electromagnetic radiation.

Hawryluk, A.M.; Ceglio, N.M.

1991-04-10T23:59:59.000Z

157

Thermal Performance Evaluation of Attic Radiant Barrier Systems Using the Large Scale Climate Simulator (LSCS)  

SciTech Connect

Application of radiant barriers and low-emittance surface coatings in residential building attics can significantly reduce conditioning loads from heat flow through attic floors. The roofing industry has been developing and using various radiant barrier systems and low-emittance surface coatings to increase energy efficiency in buildings; however, minimal data are available that quantifies the effectiveness of these technologies. This study evaluates performance of various attic radiant barrier systems under simulated summer daytime conditions and nighttime or low solar gain daytime winter conditions using the large scale climate simulator (LSCS). The four attic configurations that were evaluated are 1) no radiant barrier (control), 2) perforated low-e foil laminated oriented strand board (OSB) deck, 3) low-e foil stapled on rafters, and 4) liquid applied low-emittance coating on roof deck and rafters. All test attics used nominal RUS 13 h-ft2- F/Btu (RSI 2.29 m2-K/W) fiberglass batt insulation on attic floor. Results indicate that the three systems with radiant barriers had heat flows through the attic floor during summer daytime condition that were 33%, 50%, and 19% lower than the control, respectively.

Shrestha, Som S [ORNL] [ORNL; Miller, William A [ORNL] [ORNL; Desjarlais, Andre Omer [ORNL] [ORNL

2013-01-01T23:59:59.000Z

158

Energy-Efficient Power Control in Multipath CDMA Channels via Large System Analysis  

E-Print Network (OSTI)

This paper is focused on the design and analysis of power control procedures for the uplink of multipath code-division-multiple-access (CDMA) channels based on the large system analysis (LSA). Using the tools of LSA, a new decentralized power control algorithm aimed at energy efficiency maximization and requiring very little prior information on the interference background is proposed; moreover, it is also shown that LSA can be used to predict with good accuracy the performance and operational conditions of a large network operating at the equilibrium over a multipath channel, i.e. the power, signal-to-interference-plus-noise ratio (SINR) and utility profiles across users, wherein the utility is defined as the number of bits reliably delivered to the receiver for each energy-unit used for transmission. Additionally, an LSA-based performance comparison among linear receivers is carried out in terms of achieved energy efficiency at the equilibrium. Finally, the problem of the choice of the utility-maximizing tr...

Buzzi, Stefano; Poor, H Vincent

2008-01-01T23:59:59.000Z

159

Energy and Cost Savings of Retro-Commissioning and Retrofit Measures for Large Office Buildings  

Science Conference Proceedings (OSTI)

This paper evaluates the energy and cost savings of seven retro-commissioning measures and 29 retrofit measures applicable to most large office buildings. The baseline model is for a hypothetical building with characteristics of large office buildings constructed before 1980. Each retro-commissioning measure is evaluated against the original baseline in terms of its potential of energy and cost savings while each retrofit measure is evaluated against the commissioned building. All measures are evaluated in five locations (Miami, Las Vegas, Seattle, Chicago and Duluth) to understand the impact of weather conditions on energy and cost savings. The results show that implementation of the seven operation and maintenance measures as part of a retro-commissioning process can yield an average of about 22% of energy use reduction and 14% of energy cost reduction. Widening zone temperature deadband, lowering VAV terminal minimum air flow set points and lighting upgrades are effective retrofit measures to be considered.

Wang, Weimin; Zhang, Jian; Moser, Dave; Liu, Guopeng; Athalye, Rahul A.; Liu, Bing

2012-08-03T23:59:59.000Z

160

A scalable messaging system for accelerating discovery from large scale scientific simulations  

SciTech Connect

Emerging scientific and engineering simulations running at scale on leadership-class High End Computing (HEC) environments are producing large volumes of data, which has to be transported and analyzed before any insights can result from these simulations. The complexity and cost (in terms of time and energy) associated with managing and analyzing this data have become significant challenges, and are limiting the impact of these simulations. Recently, data-staging approaches along with in-situ and in-transit analytics have been proposed to address these challenges by offloading I/O and/or moving data processing closer to the data. However, scientists continue to be overwhelmed by the large data volumes and data rates. In this paper we address this latter challenge. Specifically, we propose a highly scalable and low-overhead associative messaging framework that runs on the data staging resources within the HEC platform, and builds on the staging-based online in-situ/in- transit analytics to provide publish/subscribe/notification-type messaging patterns to the scientist. Rather than having to ingest and inspect the data volumes, this messaging system allows scientists to (1) dynamically subscribe to data events of interest, e.g., simple data values or a complex function or simple reduction (max()/min()/avg()) of the data values in a certain region of the application domain is greater/less than a threshold value, or certain spatial/temporal data features or data patterns are detected; (2) define customized in-situ/in-transit actions that are triggered based on the events, such as data visualization or transformation; and (3) get notified when these events occur. The key contribution of this paper is a design and implementation that can support such a messaging abstraction at scale on high- end computing (HEC) systems with minimal overheads. We have implemented and deployed the messaging system on the Jaguar Cray XK6 machines at Oak Ridge National Laboratory and the Lonestar system at the Texas Advanced Computing Center (TACC), and we present the experimental performance evaluation using these HEC platforms in the paper.

Jin, Tong [Rutgers University; Zhang, Fan [Rutgers University; Parashar, Manish [Rutgers University; Klasky, Scott A [ORNL; Podhorszki, Norbert [ORNL; Abbasi, Hasan [ORNL

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Electrokinetic and hydrodynamic properties of charged-particles systems: From small electrolyte ions to large colloids  

E-Print Network (OSTI)

Dynamic processes in dispersions of charged spherical particles are of importance both in fundamental science, and in technical and bio-medical applications. There exists a large variety of charged-particles systems, ranging from nanometer-sized electrolyte ions to micron-sized charge-stabilized colloids. We review recent advances in theoretical methods for the calculation of linear transport coefficients in concentrated particulate systems, with the focus on hydrodynamic interactions and electrokinetic effects. Considered transport properties are the dispersion viscosity, self- and collective diffusion coefficients, sedimentation coefficients, and electrophoretic mobilities and conductivities of ionic particle species in an external electric field. Advances by our group are also discussed, including a novel mode-coupling-theory method for conduction-diffusion and viscoelastic properties of strong electrolyte solutions. Furthermore, results are presented for dispersions of solvent-permeable particles, and particles with non-zero hydrodynamic surface slip. The concentration-dependent swelling of ionic microgels is discussed, as well as a far-reaching dynamic scaling behavior relating colloidal long- to short-time dynamics.

G. Nägele; M. Heinen; A. J. Banchio; C. Contreras-Aburto

2013-09-13T23:59:59.000Z

162

Study of few-nucleon systems with the CEBAF large acceptance spectrometer  

Science Conference Proceedings (OSTI)

The study of few-nucleon systems at intermediate energies is an important aspect of the nuclear-physics program carried out by the CLAS Collaboration at Jefferson Laboratory. Our investigations aim at understanding the nuclear dynamics at short distances, the transition from hadronic to partonic description of nuclei, and how nuclei can be described in the framework of Quantum Chromodynamics. Our data on photodisintegration of 3He and 4He at beam energies from 0.3 GeV to 1.5 GeV strongly favor theoretical calculations that include three-body mechanisms and indicate significant contributions of these mechanisms at large momentum transfer, especially in the range of photon energies from 0.6 GeV to 0.8 GeV. Our investigations of exclusive and inclusive electron scattering off nuclear targets have yielded the determination of the ratio of pp to pn correlated pairs in 3He and of the probabilities of short-range correlations in nuclei. We have studied the transition from hadronic to partonic dynamics in nuclear processes by searching for the onset of scaling of the invariant cross sections of photoinduced reactions on few-nucleon systems. Our data are consistent with scaling at momentum transfer as low as 1 (GeV/c)2

Yordanka Ilieva

2011-05-01T23:59:59.000Z

163

Building a Large Scale Climate Data System in Support of HPC Environment  

SciTech Connect

The Earth System Grid Federation (ESG) is a large scale, multi-institutional, interdisciplinary project that aims to provide climate scientists and impact policy makers worldwide a web-based and client-based platform to publish, disseminate, compare and analyze ever increasing climate related data. This paper describes our practical experiences on the design, development and operation of such a system. In particular, we focus on the support of the data lifecycle from a high performance computing (HPC) perspective that is critical to the end-to-end scientific discovery process. We discuss three subjects that interconnect the consumer and producer of scientific datasets: (1) the motivations, complexities and solutions of deep storage access and sharing in a tightly controlled environment; (2) the importance of scalable and flexible data publication/population; and (3) high performance indexing and search of data with geospatial properties. These perceived corner issues collectively contributed to the overall user experience and proved to be as important as any other architectural design considerations. Although the requirements and challenges are rooted and discussed from a climate science domain context, we believe the architectural problems, ideas and solutions discussed in this paper are generally useful and applicable in a larger scope.

Wang, Feiyi [ORNL; Harney, John F [ORNL; Shipman, Galen M [ORNL

2011-01-01T23:59:59.000Z

164

Underwater photomosaic system $40,000 Sandin is working to develop a new tool to take large-scale  

E-Print Network (OSTI)

Underwater photomosaic system $40,000 Sandin is working to develop a new tool to take large-scale photographs of the underwater environment. The effort comes in capturing many hi-resolution images

Russell, Lynn

165

Comparison between the Large-Scale Environments of Moderate and Intense Precipitating Systems in the Mediterranean Region  

Science Conference Proceedings (OSTI)

A characterization of the large-scale environment associated with precipitating systems in the Mediterranean region, based mainly on NOAA-16 Advanced Microwave Sounding Unit (AMSU) observations from 2001 to 2007, is presented. Channels 5, 7, and ...

Beatriz M. Funatsu; Chantal Claud; Jean-Pierre Chaboureau

2009-11-01T23:59:59.000Z

166

On the Potential Impact of Irrigated Areas in North America on Summer Rainfall Caused by Large-Scale Systems  

Science Conference Proceedings (OSTI)

The potential impact of the increase in irrigated areas in North America during the past 100 years on summer rainfall associated with medium- to large-scale precipitation systems is evaluated conceptually and by several illustrative numerical ...

M. Segal; Z. Pan; R. W. Turner; E. S. Takle

1998-03-01T23:59:59.000Z

167

Implementation of an Integrated Energy Information System in a Large University Campus  

E-Print Network (OSTI)

This paper describes the design, installation and implementation of an integrated energy information system at the central plant, auxiliary utility plants, and selected buildings at the University of New Mexico in Albuquerque. The Comprehensive Integrated Metering and Monitoring System (CIMMS) at the University of New Mexico collects electricity, natural gas, chilled water and steam energy consumption and production data. The CIMMS project was implemented to develop baseline energy consumption measurements and provide the ability to evaluate and improve energy system performance through data analysis and control systems. Prior to implementation of CIMMS, the campus had only two main electric meters and no way to collect detailed steam, chilled water or natural gas consumption data. CIMMS was implemented by Square D in association with New Horizon Technologies and the Energy Systems Laboratory at Texas A&M University. As installed, CIMMS included 28 Square D Power Logic Circuit Monitors with on-board data logging, true RMS metering, ANSI C12.16 revenue accuracy, sag/swell and harmonic power quality analysis and field installable modules for Ethernet, on-board alarming and programmable logic. The system also included six Power Logic Power Meters and System Manager Software (SMS). Another key element of CIMMS is the integration of mechanical metering. Twenty Modicon Momentum Programmable Logic Controllers were networked with the Circuit monitors and collect more than 120 thermal energy data points from utility natural gas meters and campus natural gas, steam and chilled water sub-meters. Square D's SMS is the primary communication and data collection software that is used for integrating MODBUS devices, uploading onboard logs, storing historical data logs and pictorially displaying real-time data. EnerTel® software, developed by eComponents Technology, Inc., overlays the SMS database to create historical data views, load profiles, utility cost estimates and custom reports. The CIMMS software generates numerous automated custom reports including a campus energy balance with electricity, steam and chilled water subsystems, steam and chilled water production and consumption reports and individual facility or building energy production and consumption reports. This paper will focus on the design, installation and implementation challenges associated with a large, state-of-the-art energy information system. Key aspects of CIMMS that will be highlighted in this paper include the following: •Turn-key project ownership •Proven technology (Commercial, Off-the-Shelf) •Industry standard, open system network protocols •Reliance on the existing campus Ethernet TCP/IP backbone fiber optic network •Requirement of 48 hours of on-board data-logging capability at the device level to provide security from network disruption •Integration of legacy electronic Watt metering equipment into CIMMS •Extensive data analysis and reporting software requirements •Capability for integration with future building automation system (BAS).

McBride, J. R.; Schuster, L.; Rickey, D.

2003-05-01T23:59:59.000Z

168

WuKong: automatically detecting and localizing bugs that manifest at large system scales  

Science Conference Proceedings (OSTI)

A key challenge in developing large scale applications is finding bugs that are latent at the small scales of testing, but manifest themselves when the application is deployed at a large scale. Here, we ascribe a dual meaning to "large scale"---it could ... Keywords: feature reconstruction, program behavior prediction, scale-dependent bug

Bowen Zhou; Jonathan Too; Milind Kulkarni; Saurabh Bagchi

2013-06-01T23:59:59.000Z

169

Enhancing availability in large scale storage systems and services: architectures and techniques .  

E-Print Network (OSTI)

??Enterprises today are dealing with extremely large amounts of critical digital information that continues to grow at an astonishing rate. On the other hand, storage… (more)

Seshadri, Sangeetha

2009-01-01T23:59:59.000Z

170

System aspects of large scale implementation of a photovoltaic power plant.  

E-Print Network (OSTI)

?? In this thesis the static and dynamic behavior of large scale grid connected PV power plants are analyzed. A model of a 15 MW… (more)

Ruiz, Álvaro

2011-01-01T23:59:59.000Z

171

Large-Scale Electric-Vehicle Battery Systems: Long-Term . . .  

E-Print Network (OSTI)

We investigate long-term metal resource constraints for large-scale EV systems for nine types of batteries: Li-polymer(V), Li-ion(Mn, Ni and Co), NaNiCl, NiMH(AB 2 and AB 5 ), NiCd and PbA, containing seven potentially scarce metals/group of metals: lithium, nickel, cobalt, vanadium, cadmium, lead and rare-earth elements. As a basis for the analysis, we calculate EV fleet size potentials (FSP) from estimated materials requirements: metal intensities (kg/kWh) and battery energy capacities per vehicle (kWh/vehicle); and available materials: reserve base and the amount that corresponds to 100 years of mining at current rates. NiCd, Li-ion(Co) and PbA have the most limited FSP (reserve base) with 20--50 million, 200--500 million and 500--800 million vehicles, respectively. Li-ion(Mn), NaNiCl and Li-ion(Ni) have the least limited FSP (reserve base) with 3--8 billion, 3--5 billion and 2--4 billion vehicles, respectively. However, for several of the batteries, 100 years of mining at current rate is much more limiting. The FSP only indicate magnitudes and it is not hard to reach FSP values ten times lower with additional assumptions. Important factors regarding the potential for higher or lower FSP are discussed, both for materials requirements: materials intensity and energy storage capacity per vehicle; as well as for metals availability: stocks of available resources, constraints on annual mine production and competition for metals. 1.

Björn A. Andersson; Ingrid Råde

1999-01-01T23:59:59.000Z

172

Transient Stability Assessment of Power System with Large Amount of Wind Power Penetration: the  

E-Print Network (OSTI)

: a danish study case," Int. Journal of Eletrical Power and Energy Systems, vol. 28, no. 1, pp 48-57, Oct on the transient fault behavior of the Nordic power system," Int. Journal of Eletrical Power and Energy Systems

Chen, Zhe

173

Equivalencing the Collector System of a Large Wind Power Plant: Preprint  

DOE Green Energy (OSTI)

This paper focuses on our effort to develop an equivalent representation of a wind power plant collector system for power system planning studies.

Muljadi, E.; Butterfield, C. P.; Ellis, A.; Mechenbier, J.; Hochheimer, J.; Young, R.; Miller, N.; Delmerico, R.; Zavadil, R.; Smith, J. C.

2006-01-01T23:59:59.000Z

174

Built-in data-flow integration testing in large-scale component-based systems  

Science Conference Proceedings (OSTI)

Modern large-scale component-based applications and service ecosystems are built following a number of different component models and architectural styles, such as the data-flow architectural style. In this style, each building block receives data from ...

Éric Piel; Alberto Gonzalez-Sanchez; Hans-Gerhard Gross

2010-11-01T23:59:59.000Z

175

A Block-Oriented Language and Runtime System for Tensor Algebra with Very Large Arrays  

Science Conference Proceedings (OSTI)

Important classes of problems in computational chemistry, notably coupled cluster methods, consist of solutions to complicated expressions defined in terms of tensors. Tensors are represented by multidimensional arrays that are typically extremely large, ...

Beverly A. Sanders; Rod Bartlett; Erik Deumens; Victor Lotrich; Mark Ponton

2010-11-01T23:59:59.000Z

176

Large lexicons for natural language processing: utilising the grammar coding system of LDOCE  

Science Conference Proceedings (OSTI)

This article focusses on the derivation of large lexicons for natural language processing. We describe the development of a dictionary support environment linking a restructured version of the Longman Dictionary of Contemporary English to natural language ...

Bran Boguraev; Ted Briscoe

1987-07-01T23:59:59.000Z

177

Transient Stability Assessment of Power System with Large Amount of Wind Power Penetration: the  

E-Print Network (OSTI)

of HVDC connection to manage the imbalance at the system interconnections with the increased wind power. 2 is based on a 400 kV and 150 kV transmission system with HVDC connections to Nordel systems, Norway at the planned power exchange. Earlier studies in [4] and [5] have shown that the power exchange through the HVDC

Chen, Zhe

178

The Design and Application of the Water Temperature Control System for Large Aquaculture Pond  

Science Conference Proceedings (OSTI)

Because the traditional cooling methods such as ice cooling and natural convection cooling can not meet the special requirements of ornamental fish breeding, the way based on mechanical refrigeration, heat exchange system, water supply system and automatic ... Keywords: aquaculture pond for ornamental fish, water temperature automatic control, mechanical refrigeration, plate exchanger, water supply system

Chen Shuai; Zhong Ke; Cai Yingling

2011-01-01T23:59:59.000Z

179

752 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 24, NO. 2, MAY 2009 Large-Scale Distribution Planning--Part  

E-Print Network (OSTI)

752 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 24, NO. 2, MAY 2009 Large-Scale Distribution Planning methodology for low-voltage distribution network planning. Combined optimization of transformers and approximately 1 300 000 customers. Index Terms--Low voltage, network planning, power distribu- tion planning

Rudnick, Hugh

180

744 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 24, NO. 2, MAY 2009 Large-Scale Distribution Planning--Part I  

E-Print Network (OSTI)

744 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 24, NO. 2, MAY 2009 Large-Scale Distribution Planning--Part I: Simultaneous Network and Transformer Optimization Alejandro Navarro, Member, IEEE, and Hugh-voltage distribution networks. Combined optimization of transformers and associated networks is per- formed

Rudnick, Hugh

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Abstract--The use of doubly fed induction generators (DFIGs) in large wind energy conversion systems (WECS) has  

E-Print Network (OSTI)

1 Abstract--The use of doubly fed induction generators (DFIGs) in large wind energy conversion systems (WECS) has significantly increased during the last few years. The DFIG is interfaced to the AC to the AC grid during disturbances. The sensitivity of DFIGs to external faults has motivated researchers

Pota, Himanshu Roy

182

Introduction to Renewable Energy Biomass Captured solar energy from biological systems currently plays a large role in  

E-Print Network (OSTI)

Introduction to Renewable Energy ­ Biomass Captured solar energy from biological systems currently of biomass for large-scale energy services could help reduce the greenhouse gas intensity of the energy be processed and utilized in a similar manner to fossil fuels with lower net emissions of CO2. Biomass energy

Nur, Amos

183

Look-ahead voltage and load margin contingency selection functions for large-scale power systems  

SciTech Connect

Given the current operating condition (obtained from the real-time data), the near-term load demand at each bus (obtained from short-term load forecast), and the generation dispatch (say, based on economic dispatch), the authors present in this paper a load margin measure (MW and/or MVAR) to assess the system`s ability to withstand the forecasted load and generation variations. The authors also present a method to predict near-term system voltage profiles. The proposed look-ahead measure and the proposed voltage prediction are then applied to contingency selections for the near-term power system in terms of load margins to collapse and of the bus voltage magnitudes. They evaluate the proposed load-ahead measure and the voltage profile prediction on several power systems including a 1169-bus power system with 53 contingencies with promising results.

Chiang, H.D.; Wang, C.S.; Flueck, A.J. [Cornell Univ., Ithaca, NY (United States). School of Electrical Engineering

1997-02-01T23:59:59.000Z

184

Transmission Reliability Evaluation of Large Scale System (TRELSS) Software, Version 6.0  

Science Conference Proceedings (OSTI)

TRELSS, Version 6.0 has been upgraded recently. The TRELSS code simulates power transmission systems and allows the reliability of the modeled system to be accurately estimated. TRELSS computes reliability indices using a contingency enumeration approach, which involves selection and evaluation of contingencies, classification of each contingency according to specified failure criteria, and accumulation of reliability indices. Two methods of reliability assessment are used: the System Problem Approach (w...

2003-03-18T23:59:59.000Z

185

Parametric System Curves: Correlations Between Fan Pressure Rise and Flow for Large Commercial Buildings  

E-Print Network (OSTI)

distribution, duct design, system curve, fans, leakage iiifan pressure rise and flow measurements over a range of operating conditions. During design,

Sherman, Max

2010-01-01T23:59:59.000Z

186

Environmental Consequences of Large-Scale Deployment of New Energy Systems  

SciTech Connect

This project's scientific goal was to achieve better understanding of where land cover change may mitigate climate change, accounting for both direct climate effects as well as the impacts on the global carbon cycle. As tools for investigating this problem, several models of different complexities were used: an offline land model, a standard coupled climate model, and a model in which coupled carbon-climate interactions were explicitly represented. Results from all model simulations were qualitatively similar: climate mitigation projects involving large-scale re-growth of forests are predicted to be beneficial in mitigating future CO{sub 2}-induced global warming if these are carried out in the tropical latitudes, to be largely ineffectual if conducted in temperate latitudes, and to be counterproductive if implemented at high latitudes. Details of the quantitative differences in these predictions which are exhibited by the chosen climate models also are discussed.

Phillips, T J

2007-02-23T23:59:59.000Z

187

BCS MPI: N new approach i the system software design for large-scale parallel computers  

SciTech Connect

Buffered Co-Scheduled (BCS) MPI proposes a new approach to design the communication libraries for large-scale parallel machines. The emphasis of BCS MPI is on the global coordination of a large number of processes rather than in the traditional optimization of the local performance of a pair of communicating processes. BCS MPI delays the interprocessor communication in order to schedule globally the communication pattern and it is designed on top of a minimal set of collective communication primitives. In this paper we describe a prototype implementation of BCS MDI and its Communication protocols. The experimental results, executed on a set of scientific applications representative of the ASCI workload, show that BCS MPI is only marginally slower than the production-level MPI, but much simpler to implement, debug and analyze.

Fernández, J. C. (Juan C.); Petrini, F. (Fabrizio); Frachtenberg, E. (Eitan)

2003-01-01T23:59:59.000Z

188

Environmental Consequences of Large-Scale Deployment of New Energy Systems  

DOE Green Energy (OSTI)

This project's scientific goal was to achieve better understanding of where land cover change may mitigate climate change, accounting for both direct climate effects as well as the impacts on the global carbon cycle. As tools for investigating this problem, several models of different complexities were used: an offline land model, a standard coupled climate model, and a model in which coupled carbon-climate interactions were explicitly represented. Results from all model simulations were qualitatively similar: climate mitigation projects involving large-scale re-growth of forests are predicted to be beneficial in mitigating future CO{sub 2}-induced global warming if these are carried out in the tropical latitudes, to be largely ineffectual if conducted in temperate latitudes, and to be counterproductive if implemented at high latitudes. Details of the quantitative differences in these predictions which are exhibited by the chosen climate models also are discussed.

Phillips, T J

2007-02-23T23:59:59.000Z

189

Hybrid Parallelism for Volume Rendering on Large, Multi- and Many-core Systems  

SciTech Connect

With the computing industry trending towards multi- and many-core processors, we study how a standard visualization algorithm, ray-casting volume rendering, can benefit from a hybrid parallelism approach. Hybrid parallelism provides the best of both worlds: using distributed-memory parallelism across a large numbers of nodes increases available FLOPs and memory, while exploiting shared-memory parallelism among the cores within each node ensures that each node performs its portion of the larger calculation as efficiently as possible. We demonstrate results from weak and strong scaling studies, at levels of concurrency ranging up to 216,000, and with datasets as large as 12.2 trillion cells. The greatest benefit from hybrid parallelism lies in the communication portion of the algorithm, the dominant cost at higher levels of concurrency. We show that reducing the number of participants with a hybrid approach significantly improves performance.

Howison, Mark; Bethel, E. Wes; Childs, Hank

2011-01-01T23:59:59.000Z

190

A model for simulating impacts of seismic events on large power systems  

Science Conference Proceedings (OSTI)

This paper describes the capabilities and calculation logic of EPfast, a new simulation and impact analysis tool developed by Argonne National Laboratory. The tool represents an emerging set of simulation models focusing on evaluating the vulnerability ... Keywords: multi-component disruptions, power network seismic performance, seismic system vulnerability, system collapse, uncontrolled islanding

Edgar C. Portante; Brian A. Craig; Leah E. Talaber Malone; James A. Kavicky; Stephen F. Folga; Stewart Cedres

2011-04-01T23:59:59.000Z

191

Large-scale battery system modeling and analysis for emerging electric-drive vehicles  

Science Conference Proceedings (OSTI)

Emerging electric-drive vehicles demonstrate the potential for significant reduction of petroleum consumption and greenhouse gas emissions. Existing electric-drive vehicles typi- cally include a battery system consisting of thousands of Lithium-ion battery ... Keywords: analysis, battery system model, electric-drive vehicles

Kun Li; Jie Wu; Yifei Jiang; Zyad Hassan; Qin Lv; Li Shang; Dragan Maksimovic

2010-08-01T23:59:59.000Z

192

A Dynamic Information Manager for Networked Monitoring of Large Power Systems  

Science Conference Proceedings (OSTI)

The Wide Area Measurement Systems (WAMS) project, a broad-based, multi-phase effort, has been focused on enhancing the reliability of interconnected power systems. This report documents the third phase of that effort, which addresses the management of the data and information that WAMS-related technologies provide.

1999-05-18T23:59:59.000Z

193

Software architecture for the ORNL large coil test facility data system  

SciTech Connect

The VAX-based data acquisition system for the International Fusion Superconducting Magnet Test Facility (IFSMTF) at Oak Ridge National Laboratory (ORNL) is a second-generation system that evolved from a PDP-11/60-based system used during the initial phase of facility testing. The VAX-based software represents a layered implementation that provides integrated access to all of the data sources within the system, deoupling end-user data retrieval from various front-end data sources through a combination of software architecture and instrumentation data bases. Independent VAX processes manage the various front-end data sources, each being responsible for controlling, monitoring, acquiring and disposing data and control parameters for access from the data retrieval software. This paper describes the software architecture and the functionality incorporated into the various layers of the data system.

Blair, E.T.; Baylor, L.R.

1986-01-01T23:59:59.000Z

194

Energy Storage Application Brief -- Case History for Large Flywheel System: Piller -- Flywheel Energy Storage Systems for Premium Power  

Science Conference Proceedings (OSTI)

Piller of Middleton, New York produces premium power systems for power quality and uninterruptible power supply (UPS) applications. An entire family of products is commercially available in a variety of system and circuit configurations for industrial use. These products are beneficial because they are highly reliable and protect from voltage sags. The energy storage components of these systems uses mature, conventional flywheel technology. This technology review describes the various applications of the...

1999-11-23T23:59:59.000Z

195

Impacts of large quantities of wind energy on the electric power system  

E-Print Network (OSTI)

Wind energy has been surging on a global scale. Significant penetration of wind energy is expected to take place in the power system, bringing new challenges because of the variability and uncertainty of this renewable ...

Yao, Yuan, S.M. Massachusetts Institute of Technology

2011-01-01T23:59:59.000Z

196

Mesoscale Convective Systems over Western Equatorial Africa and Their Relationship to Large-Scale Circulation  

Science Conference Proceedings (OSTI)

This study examines mesoscale convective systems (MCSs) over western equatorial Africa using data from the Tropical Rainfall Measuring Mission (TRMM) satellite. This region experiences some of the world’s most intense thunderstorms and highest ...

Brian Jackson; Sharon E. Nicholson; Douglas Klotter

2009-04-01T23:59:59.000Z

197

Development and testing of an information monitoring and diagnostic system for large commercial buildings  

E-Print Network (OSTI)

system. For example, a cooling tower that operates when the° F +/- 0.01 ° F Pumps Cooling Tower Local Micro-Climate Theare chillers and cooling towers. Both of these components

1998-01-01T23:59:59.000Z

198

A collaborative framework for multi-area dynamic security assessment of large scale systems  

E-Print Network (OSTI)

that our knowledge of power system dynamics and the quality of available dynamic security analysis software- security assessment (load-flow computations) [4]­[10]. But there remain several open questions which have

Wehenkel, Louis

199

Dynamical Control in Large-Scale Material Handling Systems through Agent Technology  

Science Conference Proceedings (OSTI)

Delayed arrivals, missing tag codes, flight changes, break-downs, etc. are some of the factors, which make the environment of airport baggage handling systems (BHS) extremely dynamic. Pre-scheduling and optimization is not an option, as identity, destination, ...

Kasper Hallenborg; Yves Demazeau

2006-12-01T23:59:59.000Z

200

User's manual for computer code SOLTES-1 (simulator of large thermal energy systems). [For CDC 6600  

DOE Green Energy (OSTI)

SOLTES simulates the steady-state response of thermal energy systems to time-varying data such as weather and loads. Thermal energy system models of both simple and complex systems can easily be modularly constructed from a library of routines. These routines mathematically model solar collectors, pumps, switches, thermal energy storage, thermal boilers, auxiliary boilers, heat exchangers, extraction turbines, extraction turbine/generators, condensers, regenerative heaters, air conditioners, heating and cooling of buildings, process vapor, etc.; SOLTES also allows user-supplied routines. The analyst need only specify fluid names to obtain readout of property data for heat-transfer fluids and constants that characterize power-cycle working fluids from a fluid property data bank. A load management capability allows SOLTES to simulate total energy systems that simultaneously follow heat and power loads and demands. Generalized energy accounting is available, and values for system performance parameters may be automatically determined by SOLTES. Because of its modularity and flexibility, SOLTES can be used to simulate a wide variety of thermal energy systems such as solar power/total energy, fossil fuel power plants/total energy, nuclear power plants/total energy, solar energy heating and cooling, geothermal energy, and solar hot water heaters.

Fewell, M.E.; Grandjean, N.R.; Dunn, J.C.; Edenburn, M.W.

1978-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Design and operation of power systems with large amounts of wind power  

E-Print Network (OSTI)

Production”has been formed in IEA Wind. The R&D task will collect and share information on the experience gained and the studies made on power system impacts of wind power, and review methodologies, tools and data used. This paper outlines the power system impacts of wind power, the national studies published and ongoing and describes the goals of the international collaboration. There are dozens of studies made and ongoing related to cost of wind integration, however, the results are not easy to compare. An indepth review of the studies is needed to draw conclusions on the range of integration costs for wind power. Stateofthe art review process will seek for reasons behind the wide range of results for costs of wind integration –definitions for wind penetration, reserves and costs; different power system and load characteristics and operational rules; underlying assumptions on variability of wind etc. 1

Hannele Holttinen; Peter Meibom; Cornel Ensslin; Lutz Hofmann; John Mccann; Jan Pierik; John Olav T

2009-01-01T23:59:59.000Z

202

Large improved Wick rotation prescription in stochastic quantization of dissipative systems  

E-Print Network (OSTI)

We apply Stochastic Quantization Method to dissipative systems at finite temperature. Especially, the relation of SQM to the Caldeira-Leggett model is clarified ensuring that the naive Wick rotation is improved in this context. We show that the Langevin system obtained by the \\lq\\lq Improved Wick Rotation " prescription is equivalent to an ideal friction case ( low temperature limit) in the C-L model. We derive, based on our approach, a general formula on the fluctuation-dissipation theorem for higher derivative frictions.

Nakazawa, N; Naohito Nakazawa; Eisaku Sakane

1994-01-01T23:59:59.000Z

203

Large Improved Wick Rotation Prescription in Stochastic Quantization of Dissipative Systems  

E-Print Network (OSTI)

We apply Stochastic Quantization Method to dissipative systems at finite temperature. Especially, the relation of SQM to the Caldeira-Leggett model is clarified ensuring that the naive Wick rotation is improved in this context. We show that the Langevin system obtained by the \\lq\\lq Improved Wick Rotation " prescription is equivalent to an ideal friction case ( low temperature limit) in the C-L model. We derive, based on our approach, a general formula on the fluctuation-dissipation theorem for higher derivative frictions.

Naohito Nakazawa; Eisaku Sakane

1994-03-17T23:59:59.000Z

204

Radio frequency plasma heating in large tokamak systems near the lower hybrid resonance  

SciTech Connect

The frequency range, power, efficiency, and pulse length of a high power rf system are discussed as they might be applied to the TFTR Tokamak facility as well as on a full scale reactor. Comparisons are made of the size, power output, and costs to obtain microwave power sufficient to satisfy the physics requirements. A new microwave feed concept is discussed which will improve the coupling of the microwave energy into the plasma. The unique advantages of waveguide feed systems is apparent when one considers the practical problems associated with coupling supplementary heating energy into a reactor. (auth)

Deitz, A.; Hooke, W.M.

1975-01-01T23:59:59.000Z

205

Use of Large Scale Energy Storage for Transmission System Support: Energy Storage as Black-Start Resource  

Science Conference Proceedings (OSTI)

This project is a continuation of work conducted during 2011 and 2012 that examined the technical feasibility and assessed the potential benefits of the use of storage technologies--in particular, large battery systems--to increase transmission capability of transmission networks. Included in this effort was an analysis of the feasibility and potential benefits of using the same battery installation for multiple purposes, including overload relief, voltage control, stability improvement, and ...

2013-12-20T23:59:59.000Z

206

The Large-Angle Photon Veto System for the NA62 Experiment at CERN  

E-Print Network (OSTI)

Abstract—The branching ratio (BR) for the decay K + ? ? + ? ¯? is a sensitive probe for new physics. The NA62 experiment at the CERN SPS will measure this BR to within about 10%. To reject the dominant background from channels with final state photons, the large-angle vetoes (LAVs) must detect photons of energy as low as 200 MeV with an inefficiency of less than 10 ?4, as well as provide energy and time measurements with resolutions of 10 % and 1 ns for 1 GeV photons. The LAV detectors make creative reuse of lead glass blocks recycled from the OPAL electromagnetic calorimeter barrel. We describe the mechanical design and challenges faced during construction, the characterization of the lead glass blocks and solutions adopted for monitoring their performance, and the development of front-end electronics to allow simultaneous time and energy measurements over an extended dynamic range using the time-over-threshold

F. Ambrosino; B. Angelucci; A. Antonelli; F. Costantini; R. Fantechi; S. Gallorini; S. Giudici; E. Leonardi; I. Mannelli; P. Massarotti; M. Moulson; M. Napolitano; V. Palladino; F. Rafaelli; M. Raggi; G. Saracino; M. Serra; T. Spadaro; P. Valente; S. Venditti; F. Ambrosino; P. Massarotti; M. Napolitano

2011-01-01T23:59:59.000Z

207

Large-scale three-dimensional geothermal reservoir simulation on small computer systems  

DOE Green Energy (OSTI)

The performance of TOUGH2, Lawrence Berkeley Laboratory`s general purpose simulator for mass and heat flow and transport enhanced with the addition of a set of preconditioned conjugate gradient solvers, was tested on three PCs (486-33, 486-66, Pentium-90), a MacIntosh Quadra 800, and a workstation IBM RISC 6000. A two-phase, single porosity, 3-D geothermal reservoir model with 1,411 irregular grid blocks, with production from and injection into the reservoir was used as the test model. The code modifications to TOUGH2 and its setup in each machine environment are described. Computational work per time step and CPU time requirements are reported for each of the machines used. It is concluded that the current PCs provide the best price/performance platform for running large-scale geothermal field simulations that just a few years ago could only be executed on mainframe computers and high-end workstations.

Antunez, E.; Moridis, G.; Pruess, K.

1995-05-01T23:59:59.000Z

208

Implementation of a Large Scale Control System for a High-Energy Physics Detector: The CMS Silicon Strip Tracker  

E-Print Network (OSTI)

Control systems for modern High-Energy Physics (HEP) detectors are large distributed software systems managing a significant data volume and implementing complex operational procedures. The control software for the LHC experiments at CERN is built on top of a commercial software used in industrial automation. However, HEP specific requirements call for extended functionalities. This thesis focuses on the design and implementation of the control system for the CMS Silicon Strip Tracker but presents some general strategies that have been applied in other contexts. Specific design solutions are developed to ensure acceptable response times and to provide the operator with an effective summary of the status of the devices. Detector safety is guaranteed by proper configuration of independent hardware systems. A software protection mechanism is used to avoid the widespread intervention of the hardware safety and to inhibit dangerous commands. A wizard approach allows non expert operators to recover error situations...

Masetti, Lorenzo; Fischer, Peter

2011-01-01T23:59:59.000Z

209

A reliability and availability sensitivity study of a large photovoltaic system.  

Science Conference Proceedings (OSTI)

A reliability and availability model has been developed for a portion of the 4.6 megawatt (MWdc) photovoltaic system operated by Tucson Electric Power (TEP) at Springerville, Arizona using a commercially available software tool, GoldSim{trademark}. This reliability model has been populated with life distributions and repair distributions derived from data accumulated during five years of operation of this system. This reliability and availability model was incorporated into another model that simulated daily and seasonal solar irradiance and photovoltaic module performance. The resulting combined model allows prediction of kilowatt hour (kWh) energy output of the system based on availability of components of the system, solar irradiance, and module and inverter performance. This model was then used to study the sensitivity of energy output as a function of photovoltaic (PV) module degradation at different rates and the effect of location (solar irradiance). Plots of cumulative energy output versus time for a 30 year period are provided for each of these cases.

Stein, Joshua S.; Granata, Jennifer E.; Mundt, Michael Joseph; Miller, Steven P.; Quintana, Michael A.; Collins, Elmer W.; Sorensen, Neil Robert

2010-08-01T23:59:59.000Z

210

Optimization of a kinetic laser-plasma interaction code for large parallel systems  

Science Conference Proceedings (OSTI)

In this work, we simulate the interaction between intense laser radiation and a fully ionized plasma by solving a Vlasov-Maxwell system using the "Particle-In-Cell" (PIC) method. This method provides a very detailed description of the plasma dynamics, ... Keywords: PIC method, high-performance computing, parallel sparse solver

Olivier Coulaud; Michaël Dussere; Pascal Hénon; Erik Lefebvre; Jean Roman

2003-09-01T23:59:59.000Z

211

Participatory user centered design techniques for a large scale ad-hoc health information system  

Science Conference Proceedings (OSTI)

During mass casualty incidents, an enormous amount of data, including the vital signs of the patients, the location of the patients, and the location of the first responders must be gathered and communicated efficiently. The Advanced Health and Disaster ... Keywords: embedded medical systems, participatory design, triage

Tia Gao; Tammara Massey; Majid Sarrafzadeh; Leo Selavo; Matt Welsh

2007-06-01T23:59:59.000Z

212

A Visual Network Analysis Method for Large Scale Parallel I/O Systems  

E-Print Network (OSTI)

VAMPIRE ENERGY GAME SYSTEM: ON FOR 2 HOURS A DAY #12;4 How to get rid of your vampire plug loads You to eliminate all plug loads and the spooky vampire plug loads. Or, the simplest solution of course than was used by the machine in the factory that created it in the first place. Vampire energy Some

213

Impacts of Large-Scale Wind Generators Penetration on the Voltage Stability of Power Systems  

E-Print Network (OSTI)

by 2020 and 300 GW of installed wind power capacity in Europe by 2030. An overview of the historical to make energy available economically with reduced carbon emission using renewable energy sources-limiting factor. FACTS controllers have been used for solving various power system steady-state control problems

Pota, Himanshu Roy

214

Module Development and Simulation of the Variable Refrigerant Flow Air Conditioning System under Cooling Conditions in Energyplus  

E-Print Network (OSTI)

As a high-efficiency air conditioning scheme, the variable refrigerant flow (VRF) air-conditioning system is finding its way into medium-sized office buildings. Based on a generic dynamic building energy simulation environment, EnergyPlus, a new module is developed and the energy usage of the VRF system is investigated. This paper compares the energy consumption of the VRF system with that of two conventional air-conditioning systems, namely, the variable air volume (VAV) system and the fan-coil plus fresh air (FPFA) system. A generic office building is used to accommodate the different types of heating, ventilating, and air conditioning (HVAC) systems. Our objective is to examine the energy consumption of the VRF system applied to office buildings and make suggestions for evaluating and making decisions on HVAC systems in the early stages of building design. Simulation results show that the energy-saving potential of the VRF system is expected to achieve 22.2 percent and 11.7 percent, compared to the VAV system and the FPFA system, respectively. An energy-usage breakdown of electricity end-users in various systems is also presented.

Zhou, Y.; Wu, J.; Wang, R.; Shiochi, S.

2006-01-01T23:59:59.000Z

215

RF system models for the CERN Large Hadron Collider with application to longitudinal dynamics  

Science Conference Proceedings (OSTI)

The LHC RF station-beam interaction strongly influences the longitudinal beam dynamics, both single bunch and collective effects. Non-linearities and noise generated within the Radio Frequency (RF) accelerating system interact with the beam and contribute to beam motion and longitudinal emittance blowup. Thus, the noise power spectrum of the RF accelerating voltage strongly affects the longitudinal beam distribution. Furthermore, the coupled-bunch instabilities are also directly affected by the RF components and the configuration of the Low Level RF (LLRF) feedback loops. In this work we present a formalism relating the longitudinal beam dynamics with the RF system configurations, an estimation of collective effects stability margins, and an evaluation of longitudinal sensitivity to various LLRF parameters and configurations.

Mastorides, T.; Rivetta, C.; Fox, J.D.; Winkle, D.Van; /SLAC; Baudrenghien, P.; /CERN

2011-03-03T23:59:59.000Z

216

Development of HVAC System Performance Criteria Using Factorial Design and DOE-2 Simulation  

E-Print Network (OSTI)

A new approach is described for the development of Heating, Ventilating, and Air-conditioning (HVAC) System Performance Criteria for the Texas Building Energy Design Standard. This approach integrates a design of experimental methodology and DOE-2 simulation to identify the effects of control parameters on HVAC system energy performance. Three new criteria - transport, plant, and system performance factors-are used as measures of system performance. The procedure has been applied to the development of criteria for a variable-air-volume (VAV) and a constant-air-volume (CAV) system in three Texas climates. The results show that the air distribution system pressure loss, cooling coil exit temperature set-pint, operation of an economizer, and use of dead band controls have significant effects on air transport energy use and total system performance. The selection of control strategies and set-points have a clear impact on energy use. There is also a great energy-saving potential of converting from a CAV to a VAV system.

Hou, D.; Jones, J. W.; Hunn, B. D.; Banks, J. A.

1996-01-01T23:59:59.000Z

217

Commissioning the Domestic Hot Water System on a Large University Campus: A Case Study  

E-Print Network (OSTI)

The Texas A&M University (TAMU) main campus in College Station consists of 110 buildings with 12.5 million square feet of gross building space. Seventy-one of these buildings are connected to the main campus domestic hot water (DHW) distribution system. The DHW loop is more than 50 years old and has had continuing distribution problems. The main problems reported from several buildings were low hot water temperature and long delays in obtaining hot water at fixtures. The objective of this study was to investigate the causes of these problems and help determine how to best operate the system. It was found that reported problems of low flows, low temperatures and long hot water lag time resulted from reverse flows and no hot water circulation caused by: 1) Unadjusted return pumps with heads too high. 2) Pumps not installed or not running where needed. 3) Pumps with heads too low. 4) Check valves not installed where needed. 5) Insufficient piping capacity in two locations. This paper presents possible control strategies to alleviate these problems identified during the field investigation.

Chen, H.; Bensouda, N.; Claridge, D.; Bruner, H.

2004-01-01T23:59:59.000Z

218

Multivent effects in a large scale boiling water reactor pressure suppression system  

Science Conference Proceedings (OSTI)

The steam-driven GKSS pressure suppression test facility, which contains 3 full scale vent pipes, has been used for 5 years to investigate the postulated loss-of-coolant accident in a Mark II and Type 69 boiling water reactor. Using the results from several of these tests, wetwell boundary load data (peak pressures and spectral power) during the chugging stage, have been evaluated for sparse pool response (one and two vents in the three vent pool) and for full pool response (one, two, or three vent operation in pools of constant wetwell pool area per vent). The sparse pool results indicate the pool-system, chug event boundary loads are strongly dependent on wetwell pool area per vent, with the load increasing with decreasing area. The full pool results show a substantial increase in the pool-system, chug event boundary loads upon a change from single cell to double cell operation; only minor change occurs in going from double to triple cell operation.

McCauley, E.W.; Aust, E.; Schwan, H.

1984-07-06T23:59:59.000Z

219

Modeling of large aperture third harmonic frequency conversion of high power Nd:glass laser systems  

SciTech Connect

To provide high-energy, high-power beams at short wavelengths for inertial-confinement-fusion experiments, we routinely convert the 1.053-{mu}m output of the Nova, Nd:phosphate-glass, laser system to its third-harmonic wavelength. We describe performance and conversion efficiency modeling of the 3 {times} 3 arrays potassium-dihydrogen-phosphate crystal plates used for type II/type II phase-matched harmonic conversion of Nova 0.74-m diameter beams, and an alternate type I/type II phase-matching configuration that improves the third-harmonic conversion efficiency. These arrays provide energy conversion of up to 65% and intensity conversion to 70%. 19 refs., 11 figs.

Henesian, M.A.; Wegner, P.J.; Speck, D.R.; Bibeau, C.; Ehrlich, R.B.; Laumann, C.W.; Lawson, J.K.; Weiland, T.L.

1991-03-13T23:59:59.000Z

220

High resolution mass spectrometry method and system for analysis of whole proteins and other large molecules  

DOE Patents (OSTI)

A matrix assisted laser desorption/ionization (MALDI) method and related system for analyzing high molecular weight analytes includes the steps of providing at least one matrix-containing particle inside an ion trap, wherein at least one high molecular weight analyte molecule is provided within the matrix-containing particle, and MALDI on the high molecular weight particle while within the ion trap. A laser power used for ionization is sufficient to completely vaporize the particle and form at least one high molecular weight analyte ion, but is low enough to avoid fragmenting the high molecular weight analyte ion. The high molecular weight analyte ion is extracted out from the ion trap, and is then analyzed using a detector. The detector is preferably a pyrolyzing and ionizing detector.

Reilly, Peter T. A. (Knoxville, TN); Harris, William A. (Naperville, IL)

2010-03-02T23:59:59.000Z

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Gauge Field Generation on Large-Scale GPU-Enabled Systems  

E-Print Network (OSTI)

Over the past years GPUs have been successfully applied to the task of inverting the fermion matrix in lattice QCD calculations. Even strong scaling to capability-level supercomputers, corresponding to O(100) GPUs or more has been achieved. However strong scaling a whole gauge field generation algorithm to this regim requires significantly more functionality than just having the matrix inverter utilizing the GPUs and has not yet been accomplished. This contribution extends QDP-JIT, the migration of SciDAC QDP++ to GPU-enabled parallel systems, to help to strong scale the whole Hybrid Monte-Carlo to this regime. Initial results are shown for gauge field generation with Chroma simulating pure Wilson fermions on OLCF TitanDev.

Winter, Frank

2012-01-01T23:59:59.000Z

222

Gauge Field Generation on Large-Scale GPU-Enabled Systems  

E-Print Network (OSTI)

Over the past years GPUs have been successfully applied to the task of inverting the fermion matrix in lattice QCD calculations. Even strong scaling to capability-level supercomputers, corresponding to O(100) GPUs or more has been achieved. However strong scaling a whole gauge field generation algorithm to this regim requires significantly more functionality than just having the matrix inverter utilizing the GPUs and has not yet been accomplished. This contribution extends QDP-JIT, the migration of SciDAC QDP++ to GPU-enabled parallel systems, to help to strong scale the whole Hybrid Monte-Carlo to this regime. Initial results are shown for gauge field generation with Chroma simulating pure Wilson fermions on OLCF TitanDev.

Frank Winter

2012-12-04T23:59:59.000Z

223

Performance assessment of mass flow rate measurement capability in a large scale transient two-phase flow test system  

SciTech Connect

Mass flow is an important measured variable in the Loss-of-Fluid Test (LOFT) Program. Large uncertainties in mass flow measurements in the LOFT piping during LOFT coolant experiments requires instrument testing in a transient two-phase flow loop that simulates the geometry of the LOFT piping. To satisfy this need, a transient two-phase flow loop has been designed and built. The load cell weighing system, which provides reference mass flow measurements, has been analyzed to assess its capability to provide the measurements. The analysis consisted of first performing a thermal-hydraulic analysis using RELAP4 to compute mass inventory and pressure fluctuations in the system and mass flow rate at the instrument location. RELAP4 output was used as input to a structural analysis code SAPIV which is used to determine load cell response. The computed load cell response was then smoothed and differentiated to compute mass flow rate from the system. Comparison between computed mass flow rate at the instrument location and mass flow rate from the system computed from the load cell output was used to evaluate mass flow measurement capability of the load cell weighing system. Results of the analysis indicate that the load cell weighing system will provide reference mass flows more accurately than the instruments now in LOFT.

Nalezny, C.L.; Chapman, R.L.; Martinell, J.S.; Riordon, R.P.; Solbrig, C.W.

1979-01-01T23:59:59.000Z

224

Enhancing I/O Throughput via Efficient Routing and Placement for Large-scale Parallel File Systems  

Science Conference Proceedings (OSTI)

As storage systems get larger to meet the demands of petascale systems, careful planning must be applied to avoid congestion points and extract the maximum performance. In addition, the large data sets generated by such systems makes it desirable for all compute resources to have common access to this data without needing to copy it to each machine. This paper describes a method of placing I/O close to the storage nodes to minimize contention on Cray s SeaStar2+ network, and extends it to a routed Lustre configuration to gain the same benefits when running against a center-wide file system. Our experiments using half of the resources of Spider the center-wide file system at the Oak Ridge Leadership Computing Facility show that I/O write bandwidth can be improved by up to 45% (from 71.9 to 104 GB/s) for a direct-attached configuration and by 137% (47.6 GB/s to 115 GB/s) for a routed configuration. We demonstrated up to 20.7% reduction in run-time for production scientific applications. With the full Spider system, we demonstrated over 240 GB/s of aggregate bandwidth using our techniques.

Dillow, David A [ORNL; Shipman, Galen M [ORNL; Oral, H Sarp [ORNL; Zhang, Zhe [ORNL; Kim, Youngjae [ORNL

2011-01-01T23:59:59.000Z

225

Challenges for deploying dedicated, large-scale, bioenergy systems in the USA  

E-Print Network (OSTI)

In the next quarter-century, global demand for energy is expected to increase more than 25%, while some analysts are predicting that output of petroleum will soon peak. This reality of increasing demand in the face of diminishing fossil supplies is spurring interest in renewable energy sources. An array of biomass-for-bioenergy resources has been proposed, with perennial, lignocellulosic feedstocks showing the greatest potential. Assessment of potential biomass energy resources is difficult, however, as uncertainties over available land and crop yields swing reported estimates from 35 to 1135 EJ/year. In the USA, it has been suggested that more than 1 billion tonnes (910 million Mg) of biomass could be sustainably harvested, but these estimates are dependent on continued gains in plant productivity, nutrient use efficiency and soil and water conservation. Variables of population growth and increased standards of living will also affect the availability of land for these energy-producing endeavours. Several biofuel sources have been identified to include waste streams, microalgae and woody biomass plantations. With herbaceousbased systems, much effort is currently being given to corn and other starch or grain crops that can be readily converted to ethanol. While these crops may serve to jumpstart the biofuel

John H. Fike; David J. Parrish; Jeffrey Alwang; John S. Cundiff

2007-01-01T23:59:59.000Z

226

Modeling of decentralized linear observer and tracker for a class of unknown interconnected large-scale sampled-data nonlinear systems with closed-loop decoupling property  

Science Conference Proceedings (OSTI)

A novel low-order modeling of decentralized linear observer-based tracker is presented in this paper for a class of unknown interconnected large-scale sampled-data nonlinear systems with closed-loop decoupling property. The appropriate (low-)order decentralized ... Keywords: Digital redesign, Large-scale system, Observer, Observer/Kalman filter identification, Tracker

Jason Sheng-Hong Tsai; Nien-Tsu Hu; Po-Chuan Yang; Shu-Mei Guo; Leang-San Shieh

2010-08-01T23:59:59.000Z

227

Construction and Performance of Large-Area Triple-GEM Prototypes for Future Upgrades of the CMS Forward Muon System  

E-Print Network (OSTI)

At present, part of the forward RPC muon system of the CMS detector at the CERN LHC remains uninstrumented in the high-\\eta region. An international collaboration is investigating the possibility of covering the 1.6 radiation hardness, these micro-pattern gas detectors are an appealing option for simultaneously enhancing muon tracking and triggering capabilities in a future upgrade of the CMS detector. A general overview of this feasibility study will be presented. The design and construction of small (10\\times10 cm2) and full-size trapezoidal (1\\times0.5 m2) triple-GEM prototypes will be described. During detector assembly, different techniques for stretching the GEM foils were tested. Results from measurements with x-rays and from test beam campaigns at the CERN SPS will be shown for the small and large prototypes. Preliminary simulation studies on the expected muon reconstruction and trigger performances of this proposed upgraded muon system will be reported.

M. Tytgat; A. Marinov; N. Zaganidis; Y. Ban; J. Cai; H. Teng; A. Mohapatra; T. Moulik; M. Abbrescia; A. Colaleo; G. de Robertis; F. Loddo; M. Maggi; S. Nuzzo; S. A. Tupputi; L. Benussi; S. Bianco; S. Colafranceschi; D. Piccolo; G. Raffone; G. Saviano; M. G. Bagliesi; R. Cecchi; G. Magazzu; E. Oliveri; N. Turini; T. Fruboes; D. Abbaneo; C. Armagnaud; P. Aspell; S. Bally; U. Berzano; J. Bos; K. Bunkowski; J. P. Chatelain; J. Christiansen; A. Conde Garcia; E. David; R. De Oliveira; S. Duarte Pinto; S. Ferry; F. Formenti; L. Franconi; A. Marchioro; K. Mehta; J. Merlin; M. V. Nemallapudi; H. Postema; A. Rodrigues; L. Ropelewski; A. Sharma; N. Smilkjovic; M. Villa; M. Zientek; A. Gutierrez; P. E. Karchin; K. Gnanvo; M. Hohlmann; M. J. Staib

2011-11-30T23:59:59.000Z

228

Impacts of Large Amounts of Wind Power on Design and Operation of Power Systems, Results of IEA Collaboration  

SciTech Connect

There are a multitude of studies completed and ongoing related to the cost of wind integration. However, the results are not easy to compare. An international forum for exchange of knowledge of power system impacts of wind power has been formed under the IEA Implementing Agreement on Wind Energy. IEA WIND R and D Task 25 on 'Design and Operation of Power Systems with Large Amounts of Wind Power' produced a state-of-the-art report in October 2007, where the most relevant wind-power grid integration studies were analyzed, especially regarding methodologies and input data. This paper summarizes the results from 18 case studies, with discussion on differences in methodology as well as issues that have been identified to impact the cost of wind integration.

Holttinen, H.; Meibom, P.; Orths, A.; O'Malley, M.; Ummels, B. C.; Tande, J. O.; Estanqueiro, A.; Gomez, E.; Smith, J. C.; Ela, E.

2008-01-01T23:59:59.000Z

229

HIGH-TEMPERATURE ELECTROLYSIS FOR LARGE-SCALE HYDROGEN AND SYNGAS PRODUCTION FROM NUCLEAR ENERGY – SYSTEM SIMULATION AND ECONOMICS  

DOE Green Energy (OSTI)

A research and development program is under way at the Idaho National Laboratory (INL) to assess the technological and scale-up issues associated with the implementation of solid-oxide electrolysis cell technology for efficient high-temperature hydrogen production from steam. This work is supported by the US Department of Energy, Office of Nuclear Energy, under the Nuclear Hydrogen Initiative. This paper will provide an overview of large-scale system modeling results and economic analyses that have been completed to date. System analysis results have been obtained using the commercial code UniSim, augmented with a custom high-temperature electrolyzer module. Economic analysis results were based on the DOE H2A analysis methodology. The process flow diagrams for the system simulations include an advanced nuclear reactor as a source of high-temperature process heat, a power cycle and a coupled steam electrolysis loop. Several reactor types and power cycles have been considered, over a range of reactor outlet temperatures. Pure steam electrolysis for hydrogen production as well as coelectrolysis for syngas production from steam/carbon dioxide mixtures have both been considered. In addition, the feasibility of coupling the high-temperature electrolysis process to biomass and coal-based synthetic fuels production has been considered. These simulations demonstrate that the addition of supplementary nuclear hydrogen to synthetic fuels production from any carbon source minimizes emissions of carbon dioxide during the production process.

J. E. O'Brien; M. G. McKellar; E. A. Harvego; C. M. Stoots

2009-05-01T23:59:59.000Z

230

Cost-efficient monitoring of water quality in district heating systems This article examines the monitoring strategy for water quality in a large Danish district  

E-Print Network (OSTI)

Cost-efficient monitoring of water quality in district heating systems This article examines the monitoring strategy for water quality in a large Danish district heating system ­ and makes a proposal for a technical and economic improvement. Monitoring of water quality in district heating systems is necessary

231

Assessment of generic solar thermal systems for large power applications. Volume II. Analysis of thermal energy production costs for systems from 50 to 600 MWt  

SciTech Connect

A comparative analysis of solar thermal concepts that are potentially suitable for development as large process heat systems (50 to 600 MWt) was performed. The concepts considered can be classified into three categories based on the type of solar tracking used by the collector: (1) two-axis tracking, in which concentrators track the sun's motion in both azimuth and altitude; (2) one-axis tracking, in which concentrators track changes in either azimuth or altitude; and (3) non-tracking, in which the concentrators are fixed. Seven generic types of collectors were considered. Conceptual designs developed for the seven systems were based on common assumptions of available technology in the 1990 to 2000 time frame. Costs were estimated on the basis of identical assumptions, ground rules, methodologies, and unit costs of materials and labor applied uniformly to all of the concepts.

Bird, S.P.; Apley, W.J.; Barnhart, J.S.; Brown, D.R.; Drost, M.K.; Fort, J.A.; Garrett-Price, B.A.; Williams, T.A.

1981-06-01T23:59:59.000Z

232

Assessment of generic solar thermal systems for large power applications. Volume II. Analysis of thermal energy production costs for systems from 50 to 600 MWt  

DOE Green Energy (OSTI)

A comparative analysis of solar thermal concepts that are potentially suitable for development as large process heat systems (50 to 600 MWt) was performed. The concepts considered can be classified into three categories based on the type of solar tracking used by the collector: (1) two-axis tracking, in which concentrators track the sun's motion in both azimuth and altitude; (2) one-axis tracking, in which concentrators track changes in either azimuth or altitude; and (3) non-tracking, in which the concentrators are fixed. Seven generic types of collectors were considered. Conceptual designs developed for the seven systems were based on common assumptions of available technology in the 1990 to 2000 time frame. Costs were estimated on the basis of identical assumptions, ground rules, methodologies, and unit costs of materials and labor applied uniformly to all of the concepts.

Bird, S.P.; Apley, W.J.; Barnhart, J.S.; Brown, D.R.; Drost, M.K.; Fort, J.A.; Garrett-Price, B.A.; Williams, T.A.

1981-06-01T23:59:59.000Z

233

On generation of Alfvenic-like fluctuations by drift wave-zonal flow system in large plasma device experiments  

SciTech Connect

According to recent experiments, magnetically confined fusion plasmas with ''drift wave-zonal flow turbulence'' (DW-ZF) give rise to broadband electromagnetic waves. Sharapov et al. [Europhysics Conference Abstracts, 35th EPS Conference on Plasma Physics, Hersonissos, 2008, edited by P. Lalousis and S. Moustaizis (European Physical Society, Switzerland, 2008), Vol. 32D, p. 4.071] reported an abrupt change in the magnetic turbulence during L-H transitions in Joint European Torus [P. H. Rebut and B. E. Keen, Fusion Technol. 11, 13 (1987)] plasmas. A broad spectrum of Alfvenic-like (electromagnetic) fluctuations appears from ExB flow driven turbulence in experiments on the large plasma device (LAPD) [W. Gekelman et al., Rev. Sci. Instrum. 62, 2875 (1991)] facility at UCLA. Evidence of the existence of magnetic fluctuations in the shear flow region in the experiments is shown. We present one possible theoretical explanation of the generation of electromagnetic fluctuations in DW-ZF systems for an example of LAPD experiments. The method used is based on generalizing results on shear flow phenomena from the hydrodynamics community. In the 1990s, it was realized that fluctuation modes of spectrally stable nonuniform (sheared) flows are non-normal. That is, the linear operators of the flows modal analysis are non-normal and the corresponding eigenmodes are not orthogonal. The non-normality results in linear transient growth with bursts of the perturbations and the mode coupling, which causes the generation of electromagnetic waves from the drift wave-shear flow system. We consider shear flow that mimics tokamak zonal flow. We show that the transient growth substantially exceeds the growth of the classical dissipative trapped-particle instability of the system.

Horton, W.; Correa, C. [Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712 (United States); Chagelishvili, G. D.; Avsarkisov, V. S.; Lominadze, J. G. [Georgian National Astrophysical Observatory, The Chavchavadze State University, Tbilisi 0160, Georgia and M. Nodia Institute of Geophysics, Tbilisi 0193, Georgia (United States); Perez, J. C.; Kim, J.-H. [Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States); Carter, T. A. [Department of Physics, University of California, Los Angeles, California 90095 (United States)

2009-09-15T23:59:59.000Z

234

Room Temperature Control During Season Switchover with Single Duct Variable Air Volume System Without Reheat  

E-Print Network (OSTI)

The Langford “A” building houses the College of Architecture on TAMU campus. There are ten singleduct variable air volume (VAV) air-handling units (AHUs) without reheat serving the building. The local pneumatic thermostats modulate the dampers of VAV boxes to maintain room temperature at their setpoints. The thermostat action is switched from direct acting (DA) to reverse acting (RA) when the season changes from fall to winter and vice versa from winter to spring, based on the out side air temperature, when season changes. This results in various parts of the building ether too cold or too hot during the season change. This paper presents that the thermostat action will be switched according to cooling loads or discharge air temperature, instead of outside air temperature. For the interior zone, thermostat action does not need to be switched at all. The comfort is improved and savings is achieved by the new control scheme. Because some air-handling units (AHUs) serve both interior and exterior zones, this system never worked as intended. The system must be modified to have zone reheat and the AHUs discharge air temperature is set below dew point for humidity control.

Liu, C.; Deng, S.; Claridge, D. E.; Turner, W. D.; Bruner, H.

2003-01-01T23:59:59.000Z

235

GrenchMark: A Framework for Testing Large-Scale Distributed Computing Systems Alexandru Iosup (Delft University of Technology, The Netherlands)  

E-Print Network (OSTI)

computing - Computing as utility (similar to electricity) - Small components, distributed cost of ownership://grenchmark.st.ewi.tudelft.nlgrenchmark.st.ewi.tudelft.nl// The GrenchMark framework for testing large-scale distributed systems Testing Multi-Cluster Grids · Generate and annotation data · Tested in grids, peer-to-peer systems, and heterogeneous clusters - Extensible reference

Iosup, Alexandru

236

Simulation of the Post-Retrofit Thermal Energy Use for the Perry-Castaneda Library Building with the Use of Simplified System Models  

E-Print Network (OSTI)

Several state owned buildings with dual-duct constant volume (DDCV) systems are being retrofitted with energy efficient variable air volume (VAV) systems as part of Texas LoanSTAR Program. One method of determining the energy savings resulting from energy conserving retrofits relies on the use of a model for the daily whole building consumption, Epre, in the pre-retrofit configuration. Epre is typically a function of primary influencing parameters such as ambient temperature, humidity, building internal gains and others (Figure 1). Following the retrofit, the energy saved, E,av is determined using measured daily consumption, Emea3 as shown in Figure 1. This method is being used in the Texas LoanSTAR monitoring and analysis program for buildings that have adequate pre-retrofit monitored data. Unfortunately, in the Perry-Castaneda Library (PCL) building, the retrofits were completed before the monitoring instrumentation was installed. Therefore, no pre-retrofit monitored data are available for this building. Hence another method to estimate savings is needed. Such a method was developed and tested (Katipamula and Claridge 1991). This method was based on the use of the ASHRAE TC 4.7 simplified energy analysis procedure (SEAP). It involved developing one model each for the VAV (post-retrofit system) and the DDCV (pre-retrofit system) systems.

Katipamula, S.; Claridge, D. E.

1991-01-01T23:59:59.000Z

237

Measurement of the Effectiveness of a Decision Support System for Blending Control of Large Scale Coal Mines .  

E-Print Network (OSTI)

??Large opencast coal mines require a complex infrastructure to fulfill production demand and quality values. The distinct specifications required by each customer are achieved by… (more)

Tenorio, Victor Octavio

2012-01-01T23:59:59.000Z

238

Co-gasification of municipal solid waste and material recovery in a large-scale gasification and melting system  

Science Conference Proceedings (OSTI)

Highlights: Black-Right-Pointing-Pointer This study evaluates the effects of co-gasification of MSW with MSW bottom ash. Black-Right-Pointing-Pointer No significant difference between MSW treatment with and without MSW bottom ash. Black-Right-Pointing-Pointer PCDD/DFs yields are significantly low because of the high carbon conversion ratio. Black-Right-Pointing-Pointer Slag quality is significantly stable and slag contains few hazardous heavy metals. Black-Right-Pointing-Pointer The final landfill amount is reduced and materials are recovered by DMS process. - Abstract: This study evaluates the effects of co-gasification of municipal solid waste with and without the municipal solid waste bottom ash using two large-scale commercial operation plants. From the viewpoint of operation data, there is no significant difference between municipal solid waste treatment with and without the bottom ash. The carbon conversion ratios are as high as 91.7% and 95.3%, respectively and this leads to significantly low PCDD/DFs yields via complete syngas combustion. The gross power generation efficiencies are 18.9% with the bottom ash and 23.0% without municipal solid waste bottom ash, respectively. The effects of the equivalence ratio are also evaluated. With the equivalence ratio increasing, carbon monoxide concentration is decreased, and carbon dioxide and the syngas temperature (top gas temperature) are increased. The carbon conversion ratio is also increased. These tendencies are seen in both modes. Co-gasification using the gasification and melting system (Direct Melting System) has a possibility to recover materials effectively. More than 90% of chlorine is distributed in fly ash. Low-boiling-point heavy metals, such as lead and zinc, are distributed in fly ash at rates of 95.2% and 92.0%, respectively. Most of high-boiling-point heavy metals, such as iron and copper, are distributed in metal. It is also clarified that slag is stable and contains few harmful heavy metals such as lead. Compared with the conventional waste management framework, 85% of the final landfill amount reduction is achieved by co-gasification of municipal solid waste with bottom ash and incombustible residues. These results indicate that the combined production of slag with co-gasification of municipal solid waste with the bottom ash constitutes an ideal approach to environmental conservation and resource recycling.

Tanigaki, Nobuhiro, E-mail: tanigaki.nobuhiro@nsc-eng.co.jp [Nippon Steel Engineering Co., Ltd. (Head Office), Osaki Center Building 1-5-1, Osaki, Shinagawa-ku, Tokyo 141-8604 (Japan); Manako, Kazutaka [Nippon Steel Engineering Co., Ltd., 46-59, Nakabaru, Tobata-ku, Kitakyushu, Fukuoka 804-8505 (Japan); Osada, Morihiro [Nippon Steel Engineering Co., Ltd. (Head Office), Osaki Center Building 1-5-1, Osaki, Shinagawa-ku, Tokyo 141-8604 (Japan)

2012-04-15T23:59:59.000Z

239

Agile project dynamics : a strategic project management approach to the study of large-scale software development using system dynamics  

E-Print Network (OSTI)

Large-scale software engineering organizations have traditionally used plan-driven, heavyweight, waterfall-style approaches for the planning, execution, and monitoring of software development efforts. This approach often ...

Glaiel, Firas (Firas S.)

2012-01-01T23:59:59.000Z

240

LARGE-SCALE MECURY CONTROL TECHNOLOGY TESTING FOR LIGNITE-FIRED UTILITIES-OXIDATION SYSTEMS FOR WET FGD  

SciTech Connect

The Energy & Environmental Research Center (EERC) is conducting a consortium-based effort directed toward resolving the mercury (Hg) control issues facing the lignite industry. Specifically, the EERC team--the EERC, EPRI, URS, ADA-ES, Babcock & Wilcox, the North Dakota Industrial Commission, SaskPower, and the Mercury Task Force, which includes Basin Electric Power Cooperative, Otter Tail Power Company, Great River Energy, Texas Utilities (TXU), Montana-Dakota Utilities Co., Minnkota Power Cooperative, BNI Coal Ltd., Dakota Westmoreland Corporation, and the North American Coal Company--has undertaken a project to significantly and cost-effectively oxidize elemental mercury in lignite combustion gases, followed by capture in a wet scrubber. This approach will be applicable to virtually every lignite utility in the United States and Canada and potentially impact subbituminous utilities. The oxidation process is proven at the pilot-scale and in short-term full-scale tests. Additional optimization is continuing on oxidation technologies, and this project focuses on longer-term full-scale testing. The lignite industry has been proactive in advancing the understanding of and identifying control options for Hg in lignite combustion flue gases. Approximately 1 year ago, the EERC and EPRI began a series of Hg-related discussions with the Mercury Task Force as well as utilities firing Texas and Saskatchewan lignites. This project is one of three being undertaken by the consortium to perform large-scale Hg control technology testing to address the specific needs and challenges to be met in controlling Hg from lignite-fired power plants. This project involves Hg oxidation upstream of a system equipped with an electrostatic precipitator (ESP) followed by wet flue gas desulfurization (FGD). The team involved in conducting the technical aspects of the project includes the EERC, Babcock & Wilcox, URS, and ADA-ES. The host sites include Minnkota Power Cooperative Milton R. Young Unit 2 and TXU Monticello Unit 3. The work involves establishing Hg oxidation levels upstream of air pollution control devices (APCDs) and removal rates across existing ESP and FGD units, determining costs associated with those removal rates, investigating the possibility of the APCD acting as a multipollutant control device, quantifying the balance of plant impacts of the control technologies, and facilitating technology commercialization.

Michael J. Holmes; Steven A. Benson; Jeffrey S. Thompson

2004-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Research project on CO2 geological storage and groundwaterresources: Large-scale hydrological evaluation and modeling of impact ongroundwater systems  

SciTech Connect

If carbon dioxide capture and storage (CCS) technologies areimplemented on a large scale, the amounts of CO2 injected and sequesteredunderground could be extremely large. The stored CO2 then replaces largevolumes of native brine, which can cause considerable pressureperturbation and brine migration in the deep saline formations. Ifhydraulically communicating, either directly via updipping formations orthrough interlayer pathways such as faults or imperfect seals, theseperturbations may impact shallow groundwater or even surface waterresources used for domestic or commercial water supply. Possibleenvironmental concerns include changes in pressure and water table,changes in discharge and recharge zones, as well as changes in waterquality. In compartmentalized formations, issues related to large-scalepressure buildup and brine displacement may also cause storage capacityproblems, because significant pressure buildup can be produced. Toaddress these issues, a three-year research project was initiated inOctober 2006, the first part of which is summarized in this annualreport.

Birkholzer, Jens; Zhou, Quanlin; Rutqvist, Jonny; Jordan,Preston; Zhang,K.; Tsang, Chin-Fu

2007-10-24T23:59:59.000Z

242

Environemental Health and Safety www.ehs.cornell.edu October 2010 When a large-scale disaster occurs, there response systems are place, but emergency  

E-Print Network (OSTI)

Environemental Health and Safety ­ www.ehs.cornell.edu October 2010 When a large-scale disaster occurs, there response systems are place, but emergency responders can't be everywhere, helping everyone in your home or work, and the disasters that are most likely to occur in your community. Talk about what

Manning, Sturt

243

Table 1. Canola 2010 large-plot variety and systems trial at Roseau. Yield, Lb/Acre at Test Wt, Lb/Bu at  

E-Print Network (OSTI)

Table 1. Canola 2010 large-plot variety and systems trial at Roseau. Yield, Lb/Acre at Test Wt, Lb Ready, LL = LibertyLink and CL = Clearfield. 51 Varietal Trials Results Canola Canola (Brassica napus and B. rapa) is a crop developed from oilseed rape by Canadian plant breeders; the first canola variety

Thomas, David D.

244

76 IEEE SYSTEMS JOURNAL, VOL. 6, NO. 1, MARCH 2012 Investigation of the Impacts of Large-Scale Wind  

E-Print Network (OSTI)

with higher installed capacity than the connected conventional generation. This increased amount of wind available economically with reduced carbon emission using renewable energy sources. In recent years, power transmission system (FACTS) controllers have been used for solving various power system steady-state control

Pota, Himanshu Roy

245

A decomposition approach for optimizing large-scale parallel image composition on multi-core MPP systems  

Science Conference Proceedings (OSTI)

In recent years, multi-core processor architecture has emerged as the predominant hardware architecture for high performance computing (HPC) systems. In addition, computational nodes based on SMP (symmetric multiprocessing) and NUMA (non-uniform memory ...

J. Nonaka; K. Ono

2009-03-01T23:59:59.000Z

246

Effect of Secondary Echo Signals in Spin-Systems with a Large Inhomogeneous Broadening of NMR Line  

E-Print Network (OSTI)

The possibility of comparatively simple and fast determination of characteristic relaxation parameters T1, T2 and T3 for nuclear spin-systems with strong Larmor and Rabi inhomogeneous broadenings of NMR lines using the secondary echo signal effect was experimentally shown. Resides, this method gives opportunity to obtain a valuable infomation on the inhomogeneous NMR broadening which reflects the character of magnetic field microscopic destribution in such systems, as example, multidomain magnetics and superconductors.

J. G. Chigvinadze; G. I. Mamniashvili; Yu. G. Sharimanov

2003-10-22T23:59:59.000Z

247

CALIFORNIA ENERGY Large HVAC Building  

E-Print Network (OSTI)

CALIFORNIA ENERGY COMMISSION Large HVAC Building Survey Information Database of Buildings over 100 Design of Large Commercial HVAC Systems research project, one of six research elements in the Integrated Design of Large Commercial HVAC Systems Integrated Design of Small Commercial HVAC Systems Integrated

248

Study of precision weak-link stage systems with large travel range and sub-nanometer-scale resolution  

SciTech Connect

To use x-ray optics with nanometer resolution limit, scanning x-ray nanoprobes with corresponding mechanical positioning capability need to be designed. In particular, positioning stages with both sub-nanometer resolution and a positioning/scanning range of several millimeters are required. Based on our design of precision weak-link stages with interferometric encoders for the Center for Nanoscale Materials (CNM) hard x-ray nanoprobe at the Advanced Photon Source (APS) Sector 26, we have developed a new two-dimensional (2-D) weak-link stage system for nanopositioning of a specimen holder. This system provides sub-nanometer resolution, coupled with sub-nanometer metrology at a travel range of several millimeters. The 2-D weak-link stage system is designed with high structure stiffness using laminar overconstrained weak-link mechanisms [4-6]. In this paper we present the study of a linear precision weak-link stage system with sub-centimeter travel range and sub-nanometer positioning resolution. Design of a rotary weak-link stage system with 10-nrad resolution and 10-degree-level travel range is also discussed in this paper.

Shu Deming [Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439 (United States); Maser, Jorg [Center for Nanoscale Materials, Argonne National Laboratory, Argonne, IL 60439 (United States); Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439 (United States)

2010-06-23T23:59:59.000Z

249

Recent Developments of the Modelica"Buildings" Library for Building Energy and Control Systems  

Science Conference Proceedings (OSTI)

At the Modelica 2009 conference, we introduced the Buildings library, a freely available Modelica library for building energy and control systems. This paper reports the updates of the library and presents example applications for a range of heating, ventilation and air conditioning (HVAC) systems. Over the past two years, the library has been further developed. The number of HVAC components models has been doubled and various components have been revised to increase numerical robustness.The paper starts with an overview of the library architecture and a description of the main packages. To demonstrate the features of the Buildings library, applications that include multizone airflow simulation as well as supervisory and local loop control of a variable air volume (VAV) system are briefly described. The paper closes with a discussion of the current development.

Wetter, Michael; Zuo, Wangda; Nouidui, Thierry Stephane

2011-04-01T23:59:59.000Z

250

Role of Triple Phonon Excitations on Large Angle Quasi-elastic Scattering of {sup 54}Cr+{sup 208}Pb System  

Science Conference Proceedings (OSTI)

We study the large angle quasi-elastic scattering of {sup 54}Cr+{sup 208}Pb system in terms of the full-order coupled-channels formalism. We especially investigate the role of single, double and triple phonon excitations on quasi-elastic scattering cross section as well as quasi-elastic barrier distribution of this system for which the experimental data have been measured. It is shown that the triple phonon excitations both in {sup 54}Cr and {sup 208}Pb nuclei seem to be needed by the present coupled-channels calculations in order to reproduce the experimental data of quasi-elastic cross section and barrier distribution for the {sup 54}Cr+{sup 208}Pb system. We also show that the standard value of the surface diffuseness parameter for the nuclear potential a = 0.63 fm, is preferred by the experimental quasi-elastic scattering data for this system.

Zamrun, Muhammad F. [Department of Physics, University of Malaya, Kuala Lumpur 50603 (Malaysia); Jurusan Fisika FMIPA, Universitas Haluoleo, Kendari, Sulawesi Tenggara 93232 (Indonesia); Kasim, Hasan Abu [Department of Physics, University of Malaya, Kuala Lumpur 50603 (Malaysia)

2011-03-30T23:59:59.000Z

251

Design and Application of Coal Blending Control System Based on HOLLiAS-LK Large-Scale PLC  

Science Conference Proceedings (OSTI)

To make full use of coal combustion heat energy, and for the purposes of energy savings and pollutant reductions, more than two different coal needs to optimize the preparation of coal. This article describes design and application of coal blending control ... Keywords: coal blending system, PLC, cascade control, kingview

Hong Zhu; Haitao Li; Sheng Fu; Yinhua Pang

2010-06-01T23:59:59.000Z

252

906 IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. 14, NO. 8, AUGUST 2006 Transactions Briefs  

E-Print Network (OSTI)

) of the target FPAA while focusing on routing switch usage and balance again. Experimental results demonstrate. I. INTRODUCTION The ever-increasing demand in lower power systems makes analog solutions to certain to a computational analog block (CAB) in a target FPAA while focusing on routing switch usage and balance again

Lim, Sung Kyu

253

Understanding the Impact of Large-Scale Penetration of Micro Combined Heat & Power Technologies within Energy Systems  

E-Print Network (OSTI)

increase with the incorporation of additional features such as a hot water storage unit integrated ........................................................................................................ 30 FIGURE 2.2.4: FUEL CELL BASIC OPERATION............................................................................................................ 32 FIGURE 3.1.1: RESIDENTIAL HEATING & ELECTRIC SYSTEM USING A MICRO-CHP UNIT UNDER A HOT

Rudnick, Hugh

254

Operational, cost, and technical study of large windpower systems integrated with an existing electric utility. Final report  

DOE Green Energy (OSTI)

Detailed wind energy assessment from the available wind records, and evaluation of the application of wind energy systems to an existing electric utility were performed in an area known as the Texas Panhandle, on the Great Plains. The study area includes parts of Texas, eastern New Mexico, the Oklahoma Panhandle and southern Kansas. The region is shown to have uniformly distributed winds of relatively high velocity, with average wind power density of 0.53 kW/m/sup 2/ at 30 m height at Amarillo, Texas, a representative location. The annual period of calm is extremely low. Three separate compressed air storage systems with good potential were analyzed in detail, and two potential pumped-hydro facilities were identified and given preliminary consideration. Aquifer storage of compressed air is a promising possibility in the region.

Ligon, C.; Kirby, G.; Jordan, D.; Lawrence, J.H.; Wiesner, W.; Kosovec, A.; Swanson, R.K.; Smith, R.T.; Johnson, C.C.; Hodson, H.O.

1976-04-01T23:59:59.000Z

255

High speed signal and data processing using very large scale integrated (VLSI)/VHSIC general purpose computer systems  

SciTech Connect

The combined requirements of size, weight, throughput, reliability, and testability imposed on signal and data processing systems by new electro-optical sensors cannot be met with conventional architectures or circuit technology. One solution to this problem is described by the authors. This solution is a result of five years of work done to date on the Modular Missile Borne Computer (MMBC) combined with the more recent very high speed integrated circuit (VHSIC) program. 12 references.

Ramseyer, R.; Johnson, M.; Thomas, J.

1982-01-01T23:59:59.000Z

256

Stochastic Methods for Planning and Operating Power Systems with Large Amounts of Wind and Solar Power: Preprint  

DOE Green Energy (OSTI)

Wind and solar generators differ in their generation characteristics than conventional generators. The variable output and imperfect predictability of these generators face a stochastic approach to plan and operate the power system without fundamentally changing the operation and planning problems. This paper overviews stochastic modeling challenges in operations, generation planning, and transmission planning, with references to current industry and academic work. Different stochastic problem formulations, including approximations, are also discussed.

Milligan, M.; Donohoo, P.; O'Malley, M.

2012-09-01T23:59:59.000Z

257

Using a Constant Volume Displacement Ventilation System to Create a Micro Climate in a Large Airport Terminal in Bangkok  

E-Print Network (OSTI)

In order to conserve energy and create a comfortable climate for both passengers and workers at a new large international airport in Thailand, a design concept was created where only the first 2m above the occupied zone is conditioned. The temperature of the air outside of this area is allowed to rise above normal conditions. The idea was to let this temperature rise so that it was either equal to or higher than the outdoor temperature, thus reducing heat gain. Computer simulation programs were used to define parameters for the CF'D program. Once the boundary conditions were defined, the process of design analysis began. This paper will outline the steps taken to set up the CF'D program. Secondly, the exploration taken to obtain an optimal climate, and thirdly, how the many results were used to explain to both fellow engineers and the architects what had been achieved. The conclusion of this analysis was the design of special supply air grilles to meet the design criteria.

Simmonds, P.; Gaw, W.

1996-01-01T23:59:59.000Z

258

The Upgrade Path from Legacy VME to VXS Dual Star Connectivity for Large Scale Data Acquisition and Trigger Systems  

SciTech Connect

New instrumentation modules have been designed by Jefferson Lab and to take advantage of the higher performance and elegant backplane connectivity of the VITA 41 VXS standard. These new modules are required to meet the 200KHz trigger rates envisioned for the 12GeV experimental program. Upgrading legacy VME designs to the high speed gigabit serial extensions that VXS offers, comes with significant challenges, including electronic engineering design, plus firmware and software development issues. This paper will detail our system design approach including the critical system requirement stages, and explain the pipeline design techniques and selection criteria for the FPGA that require embedded Gigabit serial transceivers. The entire trigger system is synchronous and operates at 250MHz clock with synchronization signals, and the global trigger signals distributed to each front end readout crate via the second switch slot in the 21 slot, dual star VXS backplane. The readout of the buffered detector signals relies on 2eSST over the standard VME64x path at >200MB/s. We have achieved 20Gb/s transfer rate of trigger information within one VXS crate and will present results using production modules in a two crate test configuration with both VXS crates fully populated. The VXS trigger modules that reside in the front end crates, will be ready for production orders by the end of the 2011 fiscal year. VXS Global trigger modules are in the design stage now, and will be complete to meet the installation schedule for the 12GeV Physics program.

Cuevas, C; Barbosa, F J; Dong, H; Gu, W; Jastrzembski, E; Kaneta, S R; Moffitt, B; Nganga, N; Raydo, B J; Somov, A; Taylor, W M

2011-10-01T23:59:59.000Z

259

Improving Control of a Dual-Duct Single-Fan Variable Air Volume Systems  

E-Print Network (OSTI)

This paper discusses improved control strategies for dual-duct single-fan variable air volume (VAV) systems. Common control strategy for supply air volume modulation is evaluated, and an improved air volume control strategy that maintains separate cold and hot air duct static pressure set points is presented. The paper also explores the interactions between the cold and hot deck temperatures and duct static pressures, and discusses the impact of non-ideal deck temperature settings on duct static pressures and overall system energy consumption. To compensate the negative impact of non-ideal cold and hot deck temperature set points, the authors propose using real-time duct static pressure readings as feedback signals to fine-tune the deck temperature set points. These new control schemes can reduce simultaneous cooling and heating while reducing fan power consumption.

Wei, G.; Martinez, J.; Minihan, T.; Brundidge, T.; Claridge, D. E.; Turner, W. D.

2003-01-01T23:59:59.000Z

260

Demonstration and System Analysis of High Temperature Steam Electrolysis for Large-Scale Hydrogen Production Using SOFCs  

DOE Green Energy (OSTI)

At the Idaho National Engineering Laboratory, an integrated laboratory scale (ILS), 15 kW high-temperature electrolysis (HTE) facility has been developed under the U.S. Department of Energy Nuclear Hydrogen Initiative. Initial operation of this facility resulted in over 400 hours of operation with an average hydrogen production rate of approximately 0.9 Nm3/hr. The integrated laboratory scale facility is designed to address larger-scale issues such as thermal management (feed-stock heating, high-temperature gas handling), multiple-stack hot-zone design, multiple-stack electrical configurations, and other “integral” issues. Additionally, a reference process model of a commercial-scale high-temperature electrolysis plant for hydrogen production has been developed. The reference plant design is driven by a 600 megawatt thermal high-temperature helium-cooled reactor coupled to a direct Brayton power cycle. The electrolysis unit used to produce hydrogen consists of 4.01×106 cells with a per-cell active area of 225 cm2. A nominal cell area-specific resistance, ASR, value of 0.4 Ohm•cm2 with a current density of 0.25 A/cm2 was used, and isothermal boundary conditions were assumed. The overall system thermal-to-hydrogen production efficiency (based on the low heating value of the produced hydrogen) is 47.1% at a hydrogen production rate of 2.36 kg/s with the high-temperature helium-cooled reactor concept. This paper documents the initial operation of the ILS, with experimental details about heat-up, initial stack performance, as well as long-term operation and stack degradation. The paper will also present the optimized design for the reference nuclear-driven HTE hydrogen production plant which may be compared with other hydrogen production methods and power cycles to evaluate relative performance characteristics and plant economics.

Michael G. McKellar; James E. O'Brien; Carl M. Stoots; J. Stephen Herring

2008-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Building Energy Software Tools Directory: EZDOE  

NLE Websites -- All DOE Office Websites (Extended Search)

and much more. The Systems data involves all information concerning air handling and heat delivery systems. VAV, constant volume, PTAC, dual duct, twofour pipe fan coils, and...

262

Energy Efficient Laboratory Fume Hood  

Allows use of small HVAC systems ; Avoids expensive control systems required by VAV fume hoods ; ABSTRACT: Fume hoods, used to protect the ...

263

CALIFORNIA ENERGY Large HVAC Energy Impact Report  

E-Print Network (OSTI)

CALIFORNIA ENERGY COMMISSION Large HVAC Energy Impact Report Statewide Energy Impact Report are part of the Integrated Design of Large Commercial HVAC Systems research project. The reports: Productivity and Interior Environments Integrated Design of Large Commercial HVAC Systems Integrated Design

264

Assessment of generic solar thermal systems for large power applications: analysis of electric power generating costs for systems larger than 10 MWe  

DOE Green Energy (OSTI)

Seven generic types of collectors, together with associated subsystems for electric power generation, were considered. The collectors can be classified into three categories: (1) two-axis tracking (with compound-curvature reflecting surfaces); (2) one-axis tracking (with single-curvature reflecting surfaces); and (3) nontracking (with low-concentration reflecting surfaces). All seven collectors were analyzed in conceptual system configurations with Rankine-cycle engines. In addition, two of the collectors were analyzed with Brayton-cycle engines, and one was analyzed with a Stirling-cycle engine. With these engine options, and the consideration of both thermal and electrical storage for the Brayton-cycle central receiver, 11 systems were formulated for analysis. Conceptual designs developed for the 11 systems were based on common assumptions of available technology in the 1990 to 2000 time frame. No attempt was made to perform a detailed optimization of each conceptual design. Rather, designs best suited for a comparative evaluation of the concepts were formulated. Costs were estimated on the basis of identical assumptions, ground rules, methodologies, and unit costs of materials and labor applied uniformly to all of the concepts. The computer code SOLSTEP was used to analyze the thermodynamic performance characteristics and energy costs of the 11 concepts. Year-long simulations were performed using meteorological and insolation data for Barstow, California. Results for each concept include levelized energy costs and capacity factors for various combinations of storage capacity and collector field size.

Apley, W.J.; Bird, S.P.; Brown, D.R.; Drost, M.K.; Fort, J.A.; Garrett-Price, B.A.; Patton, W.P.; Williams, T.A.

1980-11-01T23:59:59.000Z

265

Nitrogen isotopes in the recent solar wind from the analysis of genesis targets: evidence for large scale isotope heterogeneity in the nascent solar system  

DOE Green Energy (OSTI)

Nitrogen, the fifth most abundant element in the universe, displays the largest stable isotope variations in the solar system reservoirs after hydrogen. Yet the value of isotopic composition of solar nitrogen, presumably the best proxy of the protosolar nebula composition, is not known. Nitrogen isotopes trapped in Genesis spacecraft target material indicate a 40 % depletion of {sup 15}N in solar wind N relative to inner planets and meteorites, and define a composition for the present-day Sun undistinguishable from that of Jupiter's atmosphere. These results indicate that the isotopic composition of of nitrogen in the outer convective zone of the Sun (OCZ) has not changed through time, and is representative of the protosolar nebula. Large {sup 15}N enrichments during e.g., irradiation, or contributions from {sup 15}N-rich presolar components, are required to account for planetary values.

Wiens, Roger C [Los Alamos National Laboratory; Marty, Bernard [INSU-CNRS; Zimmermann, Laurent [INSU-CNRS; Burnard, Peter G [INSU-CNRS; Burnett, Donald L [CALTECH; Heber, Veronika S [ETH ZURICH; Wieler, Rainer [ETH ZURICH; Bochsler, Peter [UNIV OV BERN

2009-01-01T23:59:59.000Z

266

The Energy Saving Potential of Membrane-Based Enthalpy Recovery...  

NLE Websites -- All DOE Office Websites (Extended Search)

The Energy Saving Potential of Membrane-Based Enthalpy Recovery in Vav Systems for Commercial Office Buildings Title The Energy Saving Potential of Membrane-Based Enthalpy Recovery...

267

The Energy Saving Potential of Membrane-Based Enthalpy Recovery...  

NLE Websites -- All DOE Office Websites (Extended Search)

The Energy Saving Potential of Membrane-Based Enthalpy Recovery in VAV System for Commercial Office Buildings Title The Energy Saving Potential of Membrane-Based Enthalpy Recovery...

268

Publications  

NLE Websites -- All DOE Office Websites (Extended Search)

Haves Clear All Filters 2012 Wang, Liping, Philip Haves, and John Breshears. "The Energy Saving Potential of Membrane-Based Enthalpy Recovery in VAV System for Commercial...

269

A Large-Droplet Mode and Prognostic Number Concentration of Cloud Droplets in the Colorado State University Regional Atmospheric Modeling System (RAMS). Part I: Module Descriptions and Supercell Test Simulations  

Science Conference Proceedings (OSTI)

The microphysics module of the version of the Regional Atmospheric Modeling System (RAMS) maintained at Colorado State University has undergone a series of improvements, including the addition of a large-cloud-droplet mode from 40 to 80 ?m in ...

Stephen M. Saleeby; William R. Cotton

2004-01-01T23:59:59.000Z

270

International Conference on Accelerator and Large Experimental...  

NLE Websites -- All DOE Office Websites (Extended Search)

and Large Experimental Physics Control Systems Covering control system topics for accelerators, telescopes, fusion, physics detectors, space exploration, and more Proceedings...

271

A Large-Droplet Mode and Prognostic Number Concentration of Cloud Droplets in the Colorado State University Regional Atmospheric Modeling System (RAMS). Part II: Sensitivity to a Colorado Winter Snowfall Event  

Science Conference Proceedings (OSTI)

This paper is the second in a two-part series describing recent additions to the microphysics module of the Regional Atmospheric Modeling System (RAMS) at Colorado State University. These changes include the addition of a large-cloud-droplet mode ...

Stephen M. Saleeby; William R. Cotton

2005-12-01T23:59:59.000Z

272

VAV Reheat Versus Active Chilled Beams and DOAS  

E-Print Network (OSTI)

and fan power. Table 1. Design Fan Power CFM CFM/ft2 Ext.has about 40% higher fan power at design conditions than the10 shows, the VAVR Design uses less fan power than the ACB+

Stein, Jeff; Taylor, Steven

2013-01-01T23:59:59.000Z

273

Solar Total Energy System, Large Scale Experiment, Shenandoah, Georgia. Final technical progress report. Volume III. Appendix. [1. 72 MW thermal and 383. 6 kW electric power for 42,000 ft/sup 2/ knitwear plant  

DOE Green Energy (OSTI)

This is the appendix to the Stearns-Roger Engineering Company conceptual design report on ERDA's Large Scale Experiment No. 2 (LSE No. 2). The object of this LSE is to design, construct, test, evaluate and operate a STES for the purpose of obtaining experience with large scale hardware systems and to establish engineering capability for subsequent demonstration projects. This particular LSE is to be located at Shenandoah, Georgia, and will provide power to the Bleyle knitwear factory. Under this contract Stearns-Roger developed a conceptual design, which was site specific, containing the following major elements: System Requirements Analysis, Site Description, System Conceptual Design, Conceptual Test and Operating Plans, Development Plans, Procurement and Management Plans for Subsequent Phases, and Cost Estimates. The Solar Total Energy system is sized to supply 1.720 MW thermal power and 383.6 KW electrical power. The STES is sized for the extended knitwear plant of 3902 M/sup 2/ (42,000 sq-ft) which will eventually employ 300 people. Drawings, tables, and data sheets are included on hourly temperatures, displacement, utility rates, power conversion system, seasonal design load summary, average collector temperature optimization study, system operating temperature optimization study, power conversion system seasonal performance, thermal storage/fluid loop, system integration, and cost estimates. (WHK)

None,

1977-10-17T23:59:59.000Z

274

Large-Eddy Simulation: How Large is Large Enough?  

Science Conference Proceedings (OSTI)

The length scale evolution of various quantities in a clear convective boundary layer (CBL), a stratocumulus-topped boundary layer, and three radiatively cooled (“smoke cloud”) convective boundary layers are studied by means of large-eddy ...

Stephan R. de Roode; Peter G. Duynkerke; Harm J. J. Jonker

2004-02-01T23:59:59.000Z

275

Torsional Torques and Fatigue Life Expenditure for Large-Scale Steam Turbine-Generator Shafts and Blades Due to Power System Harmonics.  

E-Print Network (OSTI)

??During the three decades, the torsional impact on turbine-generator sets due to power system disturbances has been extensively discussed in many research works. However, most… (more)

Tsai, Jong-ian

2004-01-01T23:59:59.000Z

276

IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. 9, NO. 1, FEBRUARY 2001 15 Energy-Efficient Design of Battery-Powered  

E-Print Network (OSTI)

architecture to- gether with energy consumption models for the components modeled. III. SYSTEM MODEL Typical for enhancing cycle-accurate simulators with energy models of typical components used in embedded system design in the source code that will provide largest overall energy sav- ings. A good example of profiler usage is shown

De Micheli, Giovanni

277

Performance measurement of magnetohydrodynamic code for space plasma on typical scalar-type supercomputer systems with a large number of cores  

Science Conference Proceedings (OSTI)

The computational performance of magnetohydrodynamic (MHD) code is evaluated on two typical scalar-type supercomputer systems. We have carried out performance tuning of a three-dimensional MHD code for space plasma simulations on the HA8000 (with 8192 ... Keywords: magnetohydrodynamics simulation, parallel computing, performance evaluation, scalar massively computer system

Keiichiro Fukazawa; Takayuki Umeda

2012-08-01T23:59:59.000Z

278

Nowadays, a large spectrum of knowledge is required from PhD students working within the area of Energy Conversion Systems. Nevertheless, typical PhD  

E-Print Network (OSTI)

of Energy Conversion Systems. Nevertheless, typical PhD comptetences are often restricted to their fieldTech Summer School « Integrated Approach to Energy Systems » is to make up for those lacks, bring out the main challenges and provide methodological approaches to address multi-disciplinary energy-related challenges

279

The Atmospheric Energy Budget and Large-Scale Precipitation Efficiency of Convective Systems during TOGA COARE, GATE, SCSMEX, and ARM: Cloud-Resolving Model Simulations  

Science Conference Proceedings (OSTI)

A two-dimensional version of the Goddard Cumulus Ensemble (GCE) model is used to simulate convective systems that developed in various geographic locations (east Atlantic, west Pacific, South China Sea, and Great Plains in the United States). ...

W-K. Tao; D. Johnson; C-L. Shie; J. Simpson

2004-10-01T23:59:59.000Z

280

A modeling and control framework for operating large-scale electric power systems under present and newly evolving competitive industry structures  

E-Print Network (OSTI)

This paper introduces a systematic, structure-based modeling framework for analysis and control of electric power systems for processes evolving over the mid-term and long-term time horizons. Much simpler models than the ...

Ilic, Marija

1995-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

NREL: Wind Research - Large Wind Turbine Research  

NLE Websites -- All DOE Office Websites (Extended Search)

Wind Research Search More Search Options Site Map Printable Version Large Wind Turbine Research NREL's utility scale wind system research addresses performance and...

282

A novel bio-inspired load balancing algorithm with QoS assurance for large-scale peer-to-peer systems  

Science Conference Proceedings (OSTI)

Quality of Service(QoS) is attracting more and more attention in many areas, including entertainment, emergency services and transaction services, and so on. Therefore, the study of QoS-aware systems is becoming an important research topic in the area ... Keywords: JXTA, genetic algorithm, load balance, quality of service, services migration

Azzedine Boukerche; Hengheng Xie; Ming Zhang

2009-03-01T23:59:59.000Z

283

ATU/Fort Hood Solar Total Energy Military Large-Scale Experiment (LSE-1): system design and support activities. Final report, November 23, 1976-November 30, 1977  

SciTech Connect

The ATU/Fort Hood Solar Total Energy System will include a concentrating solar collector field of several acres. During periods of direct insolation, a heat-transfer fluid will be circulated through the collector field and thus heated to 500 to 600/sup 0/F. Some of the fluid will be circulated through a steam generator to drive a turbine-generator set; additional fluid will be stored in insulated tanks for use when solar energy is not available. The electrical output will satisfy a portion of the electrical load at Fort Hood's 87,000 Troop Housing Complex. Heat extracted from the turbine exhaust in the form of hot water will be used for space heating, absorption air conditioning, and domestic water heating at the 87,000 Complex. Storage tanks for the hot water are also included. The systems analysis and program support activities include studies of solar availability and energy requirements at Fort Hood, investigation of interfacing LSE-1 with existing energy systems at the 87,000 Complex, and preliminary studies of environmental, health, and safety considerations. An extensive survey of available concentrating solar collectors and modifications to a computerized system simulation model for LSE-1 use are also reported. Important program support activities are military liaison and information dissemination. The engineering test program reported involved completion of the Solar Engineering Test Module (SETM) and extensive performance testing of a single module of the linear-focusing collector.

1977-01-01T23:59:59.000Z

284

Large displacement spherical joint  

DOE Patents (OSTI)

A new class of spherical joints has a very large accessible full cone angle, a property which is beneficial for a wide range of applications. Despite the large cone angles, these joints move freely without singularities.

Bieg, Lothar F. (Albuquerque, NM); Benavides, Gilbert L. (Albuquerque, NM)

2002-01-01T23:59:59.000Z

285

Large Scale Quantum-mechanical Calculations of Proteins, Nanomaterials...  

NLE Websites -- All DOE Office Websites (Extended Search)

Large Scale Quantum-mechanical Calculations of Proteins, Nanomaterials and Other Large Systems Event Sponsor: Leadership Computing Facility Seminar Start Date: Dec 5 2013 - 2:00pm...

286

Single-particle motion at large distances in 2N+core cluster systems near the drip line: a challenge for nuclear theory and experiment  

E-Print Network (OSTI)

There exists a class of nuclei that are obtained by adding one nucleon to a loosely-bound nucleon-core system, for example $^{12}$Be, $^9$C, $^{18}$Ne. For such nuclei, one-nucleon overlap integrals that represent single-particle motion can strongly differ from the standard ones due to the correlations between the two nucleons above the core. The possible non-standard overlap behaviour should be included in the interpretation of the experimental data derived from one nucleon removal reactions such as knockout, transfer and breakup, as well as the predictions of low-energy nucleon capture that leads to these nuclei. We investigate the non-standard behaviour within a three-body model and discuss the challenges associated with this problem.

N. K. Timofeyuk; I. J. Thompson; J. A. Tostevin

2008-05-15T23:59:59.000Z

287

Efficient spatial sampling of large geographical tables  

Science Conference Proceedings (OSTI)

Large-scale map visualization systems play an increasingly important role in presenting geographic datasets to end users. Since these datasets can be extremely large, a map rendering system often needs to select a small fraction of the data to visualize ... Keywords: data visualization, geographical databases, indexing, maps, query processing, spatial sampling

Anish Das Sarma; Hongrae Lee; Hector Gonzalez; Jayant Madhavan; Alon Halevy

2012-05-01T23:59:59.000Z

288

Large-area low-temperature ultrananocrystaline diamond (UNCD) films and integration with CMOS devices for monolithically integrated diamond MEMD/NEMS-CMOS systems.  

SciTech Connect

Because of exceptional mechanical, chemical, and tribological properties, diamond has a great potential to be used as a material for the development of high-performance MEMS and NEMS such as resonators and switches compatible with harsh environments, which involve mechanical motion and intermittent contact. Integration of such MEMS/NEMS devices with complementary metal oxide semiconductor (CMOS) microelectronics will provide a unique platform for CMOS-driven commercial MEMS/NEMS. The main hurdle to achieve diamond-CMOS integration is the relatively high substrate temperatures (600-800 C) required for depositing conventional diamond thin films, which are well above the CMOS operating thermal budget (400 C). Additionally, a materials integration strategy has to be developed to enable diamond-CMOS integration. Ultrananocrystalline diamond (UNCD), a novel material developed in thin film form at Argonne, is currently the only microwave plasma chemical vapor deposition (MPCVD) grown diamond film that can be grown at 400 C, and still retain exceptional mechanical, chemical, and tribological properties comparable to that of single crystal diamond. We have developed a process based on MPCVD to synthesize UNCD films on up to 200 mm in diameter CMOS wafers, which will open new avenues for the fabrication of monolithically integrated CMOS-driven MEMS/NEMS based on UNCD. UNCD films were grown successfully on individual Si-based CMOS chips and on 200 mm CMOS wafers at 400 C in a MPCVD system, using Ar-rich/CH4 gas mixture. The CMOS devices on the wafers were characterized before and after UNCD deposition. All devices were performing to specifications with very small degradation after UNCD deposition and processing. A threshold voltage degradation in the range of 0.08-0.44V and transconductance degradation in the range of 1.5-9% were observed.

Sumant, A.V.; Auciello, O.; Yuan, H.-C; Ma, Z.; Carpick, R. W.; Mancini, D. C.; Univ. of Wisconsin; Univ. of Pennsylvania

2009-05-01T23:59:59.000Z

289

Hot Thermal Storage/Selective Energy System Reduces Electric Demand for Space Cooling As Well As Heating in Commercial Application  

E-Print Network (OSTI)

Based on an experimental residential retrofit incorporating thermal storage, and extensive subsequent modeling, a commercial design was developed and implemented to use hot thermal storage to significantly reduce electric demand and utility energy costs during the cooling season as well as the heating season. To achieve air conditioning savings, the system separates dehumidification from sensible cooling; dehumidifies by desiccant absorption, using heat from storage to dry the desiccant; and then cools at an elevated temperature improving overall system efficiency. Efficient heat for desiccant regeneration is provided by a selective-energy system coupled with thermal storage. The selective-energy system incorporates diesel cogeneration, solar energy and off-peak electric resistance heating. Estimated energy and first cost savings, as compared with an all-electric VAV HVAC system, are: 30 to 50% in ductwork size and cost; 30% in fan energy; 25% in air handling equipment; 20 to 40% in utility energy for refrigeration; 10 to 20% in refrigeration equipment; and space savings due to smaller ductwork and equipment.

Meckler, G.

1985-01-01T23:59:59.000Z

290

Meet with Large Businesses  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Meet with Large Businesses Meet with Large Businesses and learn about upcoming acquisitions! * Federal Energy Management Program (FEMP) * National Renewable Energy Laboratory (NREL) * Small Business Administration (SBA) * U.S. Department of Energy / Energy, Efficiency, and Renewable Energy (EERE) * U.S. Department of Energy / Golden Field Office (GFO) * Western Area Power Administration (WAPA) * Colorado Procurement Technical Assistance Center (PTAC)

291

Large-Scale Hydropower  

Energy.gov (U.S. Department of Energy (DOE))

Large-scale hydropower plants are generally developed to produce electricity for government or electric utility projects. These plants are more than 30 MW in size, and there is more than 80,000 MW...

292

Workshop on Future Large CO Compression Systems  

Science Conference Proceedings (OSTI)

... Page 7. • A simple natural gas combined cycle power plant making 750 MW can ... This can be reduced with sub-critical subcooling and liquid CO ...

2012-10-08T23:59:59.000Z

293

ATP-Funded Optics Technology Produces Large Energy ...  

Science Conference Proceedings (OSTI)

1.B.8: ATP-Funded Optics Technology Produces Large Energy Savings in Petroleum Refineries and Distribution Systems, ...

2011-10-19T23:59:59.000Z

294

CALIFORNIA ENERGY Large HVAC Field and Baseline Data  

E-Print Network (OSTI)

CALIFORNIA ENERGY COMMISSION Large HVAC Field and Baseline Data Field Data Collection: Site Survey of the Integrated Design of Large Commercial HVAC Systems research project. The reports are a result of funding Design of Large Commercial HVAC Systems Integrated Design of Small Commercial HVAC Systems Integrated

295

Solar Total Energy System: Large Scale Experiment, Shenandoah, Georgia. Final technical progress report. Volume I. Section 1. Conclusions and recommendations. Section 2. Systems requirements. [1. 72-MW thermal and 383. 6-kW electric power for 42,000 ft/sup 2/ knitwear plant  

DOE Green Energy (OSTI)

The Stearns-Roger Engineering Company conceptual design of ERDA's Large Scale Experiment No. 2 (LSE No. 2) is described. The various LSE's are part of ERDA's Solar Total Energy Program (STES) and a separate activity of the National Solar Thermal Power Systems Program. The object of this LSE is to design, construct, test, evaluate and operate a STES for the purpose of obtaining experience with large scale hardware systems and to establish engineering capability for subsequent demonstration projects. This particular LSE is to be located at Shenandoah, Georgia and will provide power to the Bleyle knitwear factory. The Solar Total Energy system is sized to supply 1.720 MW thermal power (both space heating and process heat) and 383.6 KW electrical power. The STES is sized for the extended knitwear plant of 3902 M/sup 2/ (42,000 sq-ft) which will eventually employ 300 people. The section on conclusions and recommendations described the baseline design recommendation, facility requirements, the solar system, power conversion system, schedules and cost, and additional candidate systems. The systems requirements analysis includes detailed descriptions and analyses of the following subtasks: load analysis, energy displacement, local laws and ordinances, life cycle cost, health and safety, environmental assessment, reliability assessment, and utility interface. (WHK)

None,

1977-10-17T23:59:59.000Z

296

Metaprogramming in the Large  

Science Conference Proceedings (OSTI)

Software evolution demands continuous adaptation of software systems to continuously changing requirements. Our goal is to cope with software evolution by automating program transformation and system reconfiguration. We show that this can be achieved ...

Andreas Ludwig; Dirk Heuzeroth

2000-10-01T23:59:59.000Z

297

Advancement of Electrochromic Windows  

E-Print Network (OSTI)

Research Energy Systems Integration Advancement ofintegration issues related to using EC windows within a whole building energy efficient systemenergy- savings benefit with EC-daylighting-HVAC integration (assuming a conventional VAV system

2006-01-01T23:59:59.000Z

298

Large Occlusion Stereo  

Science Conference Proceedings (OSTI)

A method for solving the stereo matching problem in the presence of large occlusion is presented. A data structure—the disparity space image—is defined to facilitate the description of the effects of occlusion on the stereo matching process ... Keywords: disparity-space, dynamic-programming stereo, occlusion, stereo

Aaron F. Bobick; Stephen S. Intille

1999-09-01T23:59:59.000Z

299

Composting Large Animal Carcasses  

E-Print Network (OSTI)

Disposing of large animal carcasses can be a problem for agricultural producers. Composting is a simple, low-cost method that yields a useful product that can be used as fertilizer. In this publication you'll learn the basics of composting, how to build and maintain a compost pile, tools you will need, and how to use the finished compost.

Auvermann, Brent W.; Mukhtar, Saqib; Heflin, Kevin

2006-10-31T23:59:59.000Z

300

How the Number and Placement of Sensors Controlling Room Air Distribution Systems Affect Energy Use and Comfort  

E-Print Network (OSTI)

This study assesses the impact of sensor number and placement on the energy needed to condition a typical office using several likely variants of an underfloor air distribution system (UFAD). The study uses an empirical-based room stratification model developed from full-scale tests of UFAD systems. Annual energy consumption is calculated for an interior zone using outside air temperature bin data. The comfort criteria are taken from ASHRAE standard 55-92. The simulations indicate that there are benefits derived from using more than one temperature sensor to control conditions in the occupied zone of a room. Among these are: 1. By adjusting both supply air temperature and volume to maintain the maximum allowable thermal gradient in the occupied (lower) part of the room, an optimal supply air condition can reduce energy use (relative to the best arrangement of a single sensor) while maintaining comfort; 2. Discomfort caused by stratification can be detected by having one of the sensors located at foot level; 3. For the simulated UFAD interior zone of a typical office building in Sacramento, an overall energy saving of 8%/24% (VAV/CAV respectively) can be achieved when two sensors as opposed to one are used to control room conditions.

Wang, D.; Arens, E.; Webster, T.; Shi, M.

2002-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Single-Duct Constant Air Volume System Supply Air Temperature Reset: Using Return Air Temperature or Outside Air Temperature?  

E-Print Network (OSTI)

The supply air temperature set point for a singleduct constant air volume air handling unit (AHU) system is often reset based on either return air temperature or outside air temperature in order to reduce simultaneous cooling and heating energy consumption. Both reset strategies make engineering sense as long as the reset schedules are reasonable. Quite often the decision to use one over the other is made with the assumption that they will all achieve some sorts of energy savings. However, the impact of these two strategies on AHU energy consumption could be very different. A comparison of these two commonly used supply air temperature reset strategies for a single-duct constant air volume system is presented in this paper. It is shown that from either the building energy consumption or building comfort point of view, the reset strategy based on outside air temperature is inherently better than that based on return air temperature. Significant amount of heating energy savings can be achieved by switching from return air temperature based reset to outside air temperature based reset. The reset strategy can also benefit variable air volume (VAV) AHUs. An improved supply air temperature set point reset control strategy is proposed by combining and staging the outside air and return air temperature based resets.

Wei, G.; Turner, W. D.; Claridge, D.; Liu, M.

2002-01-01T23:59:59.000Z

302

Implicit Large Eddy Simulation  

National Nuclear Security Administration (NNSA)

Implicit Implicit Large Eddy Simulation (ILES) for High Reynolds Number Flows Len Margolin Applied Physics Division Los Alamos National Laboratory Collaborators: 1. Bill Rider (LANL) 2. Piotr Smolarkiewicz (NCAR) 3. Andrzej Wysogrodski (NCAR) 4. Fernando Grinstein (NRL) len@lanl.gov 1 Implicit Large Eddy Simulation Outline: * What is ILES? * What are its advantages? * Historical perspective * Why does it work? * Some examples len@lanl.gov 2 What is ILES ILES is the direct application of a fluid solver to a high Reynolds number fluid flow with no explicit turbulence model. · The truncation terms of the algorithm serve as an effective model of the effects of the unresolved scales. · Fluid solvers based on Nonoscillatory Finite Volume (NFV) approximations work effectively for ILES. · Fluid solvers based on pseudospectral methods, leapfrog methods, advective form methods, etc. do not work

303

Large equipment and facilities  

SciTech Connect

Component and design criteria are reviewed for a general purpose modular multiparticle spectrometer system. The study of hadronic interactions is emphasized, although the solenoidal magnet vertex detector system can be used for W bosons and other weak interaction processes. A general purpose spectrometer seems compatible with the requirements of the ISABELLE straight sections. (auth)

Louttit, R.; Love, W.; Lindenbaum, S.J.

1975-01-01T23:59:59.000Z

304

How low can you go? Low pressure drop laboratory design  

E-Print Network (OSTI)

0.7” w.g. full design flow through fan and stack only, VAV0.7” w.g. full design flow through fan and stack only, VAVTraditional Design Parameter Comment Fan System Efficiency

Weale, John; Rumsey, Peter; Sartor, Dale; Lock, Lee Eng

2001-01-01T23:59:59.000Z

305

Building Energy Software Tools Directory: ENERPASS  

NLE Websites -- All DOE Office Websites (Extended Search)

for each zone. A wide range of HVAC systems can be modelled including make-up air units, heat recovery ventilators, rooftop units, VAV, four-pipe fan coil, and dual duct. The...

306

Publications  

NLE Websites -- All DOE Office Websites (Extended Search)

Zheng, and Xiufeng Pang. "Impacts of Static Pressure Reset on VAV System Air Leakage, Fan Power, and Thermal Energy." ASHRAE Transactions 116, no. 1 (2010): 428-436. 2009 Cho,...

307

A Study of the Advanced Systems at the CMU Intelligent Workplace with an Evaluation of Potential Applications to Texas A&M International University  

E-Print Network (OSTI)

A detailed study has been conducted of the performance of several innovative aspects of the Intelligent Workplace (IW) at Carnegie Mellon University, a low energy consumption building that uses radiant heating, cooling and a desiccant ventilation unit. The following aspects have been studied in detail: the heat transfer process of radiant mullions and overhead radiant panels, the impact of the radiator position on heating load and thermal comfort, the influence of infiltration on indoor humidity in a radiantly cooled office with a solid desiccant ventilation unit, and an energy consumption comparison of the sensible heating and cooling systems with a single duct VAV system. Transferability of the advanced building technologies that are being studied at the IW was investigated by examining them to see if they could be applied in an advanced technology test bed at Texas A&M International University (TAMIU) in Laredo, Texas. Additionally, a sustainability assessment for the current TAMIU campus was performed with an analysis of the potential for TAMIU to obtain LEED certification from the US Green Building Council. This report summarizes the conclusions and observations of these studies.

Claridge, D. E.; Gong, X.; Verdict, M.; Clingenpeel, K.

2008-04-01T23:59:59.000Z

308

Large File System Backup: NERSC Global File System Experience  

E-Print Network (OSTI)

utility for scanning the inodes to create and sort list ofutility is relatively fast and it is only useful for incremental backup where a list

Mokhtarani, Akbar

2008-01-01T23:59:59.000Z

309

Large forging manufacturing process  

DOE Patents (OSTI)

A process for forging large components of Alloy 718 material so that the components do not exhibit abnormal grain growth includes the steps of: a) providing a billet with an average grain size between ASTM 0 and ASTM 3; b) heating the billet to a temperature of between 1750.degree. F. and 1800.degree. F.; c) upsetting the billet to obtain a component part with a minimum strain of 0.125 in at least selected areas of the part; d) reheating the component part to a temperature between 1750.degree. F. and 1800.degree. F.; e) upsetting the component part to a final configuration such that said selected areas receive no strains between 0.01 and 0.125; f) solution treating the component part at a temperature of between 1725.degree. F. and 1750.degree. F.; and g) aging the component part over predetermined times at different temperatures. A modified process achieves abnormal grain growth in selected areas of a component where desirable.

Thamboo, Samuel V. (Latham, NY); Yang, Ling (Niskayuna, NY)

2002-01-01T23:59:59.000Z

310

Systems  

E-Print Network (OSTI)

Abstract Developing usable and robust mixed reality systems requires unique human–computer interaction techniques and customized hardware systems. The design of the hardware is directed by the requirements of the rich 3D interactions that can be performed using immersive mobile MR systems. Geometry modeling and capture, navigational annotations, visualizations, and training simulations are all enhanced using augmented computer graphics. We present the design guidelines that have led us through 10 years of evolving mobile outdoor MR hardware systems.

Benjamin Avery; Ross T. Smith; Wayne Piekarski; Bruce H. Thomas

2009-01-01T23:59:59.000Z

311

Fail Safe Design for Large Capacity Lithium-ion Batteries  

NATIONAL RENEWABLE ENERGY LABORATORY! Challenges for Large LIB Systems 2 • Li-ion batteries are flammable, require expensive manufacturing to reduce defects

312

Large Plasma Flow Discovered in the Helically Symmetric Experiment...  

Office of Science (SC) Website

Symmetric Experiment at the University of Wisconsin-Madison and the spectroscopic system (left) that was used to measure the large plasma flow observed in the device. The...

313

Large-scale Excited Electron Molecular Mechanics/Dynamics  

Science Conference Proceedings (OSTI)

Abstract Scope, To simulate large electronically excited systems, we have developed [at the Materials and Process Simulation Center at Caltech] a molecular ...

314

Large volume flow-through scintillating detector  

DOE Patents (OSTI)

A large volume flow through radiation detector for use in large air flow situations such as incinerator stacks or building air systems comprises a plurality of flat plates made of a scintillating material arranged parallel to the air flow. Each scintillating plate has a light guide attached which transfers light generated inside the scintillating plate to an associated photomultiplier tube. The output of the photomultiplier tubes are connected to electronics which can record any radiation and provide an alarm if appropriate for the application.

Gritzo, Russ E. (Los Alamos, NM); Fowler, Malcolm M. (Los Alamos, NM)

1995-01-01T23:59:59.000Z

315

Taking the 'Large' out of Large Hadron Collider: Computational Breakthrough  

NLE Websites -- All DOE Office Websites (Extended Search)

Home » News & Publications » News » Science News » Taking the 'Large' out of Large Hadron Collider Taking the 'Large' out of Large Hadron Collider Computational breakthrough hastens modeling of 'tabletop accelerators' August 9, 2010 | Tags: Accelerator Science Contact: Margie Wylie | mwylie@lbl.gov | 510-486-7421 mori1 This 3D simulation shows how laser pulses create plasma wakes that propel electrons forward, much as a surfer is propelled forward by an ocean wave. Laser wakefield acceleration promises electron accelerators that are thousands of times more powerful than, yet a fraction the size of, conventional radio frequency devices. Particle accelerators like the Large Hadron Collider (LHC) at CERN are the big rock stars of high-energy physics-really big. The LHC cost nearly

316

Avoiding low frequency noise in packaged HVAC equipment  

Science Conference Proceedings (OSTI)

The purpose of this article is to help those involved in the design and commissioning of packaged HVAC systems to understand the root causes of low frequency noise problems and how to avoid many of them at the design stage. In the 1980's, two things happened to dramatically change the types of noise problems encountered in typical new construction. The first was the introduction of new energy regulations that favored variable air volume (VAV) distribution systems over constant volume air distribution systems. A by-product of VAV design is that mid- and high frequency sound pressure levels produced by current air terminal devices and diffusers in many applications are significantly lower than in the past. The second factor was a trend away from the use of built-up central station fan equipment in favor of packaged, floor-by-floor air handlers or rooftop units. As a result, today's HVAC system noise problems are not confined to just the roar and hiss of the past, but now include intense low frequency rumble and time modulation. Indeed, most current noise problems in modern buildings occur in the frequency range well below 250 Hz. A large fraction of these are a result of the dominant sound pressure levels in the 12 to 40 Hz region. These factors, combined with a substantial increase in the level of low frequency sound from the rest of the system, can produce a non-neutral, time modulated, rumbly sounding background noise that many people find objectionable.

Ebbing, C.E. (Carrier Corp., Syracuse, NY (United States). Commercial Unitary Division); Blazier, W.E.Jr. (Warren Blazier Associates, San Francisco, CA (United States))

1993-06-01T23:59:59.000Z

317

Principal considerations in large energy-storage capacitor banks  

SciTech Connect

Capacitor banks storing one or more megajoules and costing more than one million dollars have unique problems not often found in smaller systems. Two large banks, Scyllac at Los Alamos and Shiva at Livermore, are used as models of large, complex systems. Scyllac is a 10-MJ, 60-kV theta-pinch system while Shiva is a 20-MJ, 20-kV energy system for laser flash lamps. A number of design principles are emphasized for expediting the design and construction of large banks. The sensitive features of the charge system, the storage system layout, the switching system, the transmission system, and the design of the principal bank components are presented. Project management and planning must involve a PERT chart with certain common features for all the activities. The importance of the budget is emphasized.

Kemp, E.L.

1976-01-01T23:59:59.000Z

318

Data editing on large data sets  

SciTech Connect

The process of analyzing large data sets often includes an early exploratory stage to first, develop a basic understanding of the data and its interrelationships and second, to prepare and cleanup the data for hypothesis formulation and testing. This preliminary phase of the data analysis process usually requires facilities found in research data management systems, text editors, graphics packages, and statistics packages. Also this process usually requires the analyst to write special programs to cleanup and prepare the data for analysis. This paper describes a technique now implemented as a single computational tool, a data editor, which combines a cross section of facilities from the above systems with emphasis on research data base manipulation and subsetting techniques. The data editor provides an interactive environment to explore and manipulate data sets with particular attention to the implications of large data sets. It utilizes a relational data model and a self describing binary data format which allows data transportability to other data analysis packages. Some impacts of editing large data sets will be discussed. A technique for manipulating portions or subsets of large data sets without physical replication is introduced. Also an experimental command structure and operating environment are presented.

Thomas, J.J.; Burnett, R.A.; Lewis, J.R.

1981-01-01T23:59:59.000Z

319

Multiscale Interactions in the Life Cycle of a Tropical Cyclone Simulated in a Global Cloud-System-Resolving Model. Part I: Large-Scale and Storm-Scale Evolutions  

Science Conference Proceedings (OSTI)

The Nonhydrostatic Icosahedral Atmospheric Model (NICAM), a global cloud-system-resolving model, successfully simulated the life cycle of Tropical Storm Isobel that formed over the Timor Sea in the austral summer of 2006. The multiscale ...

Hironori Fudeyasu; Yuqing Wang; Masaki Satoh; Tomoe Nasuno; Hiroaki Miura; Wataru Yanase

2010-12-01T23:59:59.000Z

320

Large Consistent Geometric Landmark Maps  

Science Conference Proceedings (OSTI)

The autonomous operation of an intelligent service robot in practical applications requires that the robot builds up a map of the environment by itself, even for large environments like supermarkets. This paper presents a solution to the problem of building ...

Wolfgang D. Rencken; Wendelin Feiten; Martin Soika

2000-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Lightning Safety and Large Stadiums  

Science Conference Proceedings (OSTI)

When lightning threatens an outdoor activity, it is usually postponed so that people may seek a safe location. When lightning threatens a large outdoor stadium, the game or event itself is usually postponed, but it is often difficult to ensure ...

Joel Gratz; Erik Noble

2006-09-01T23:59:59.000Z

322

Solar Total Energy System, Large Scale Experiment, Shenandoah, Georgia. Final technical progress report. Volume II, Section 3. Facility concept design. [1. 72 MW thermal and 383. 6 kW electric power for 42,000 ft/sup 2/ knitwear plant  

DOE Green Energy (OSTI)

The Stearns-Roger Engineering Company conceptual design of ERDA's Large Scale Experiment No. 2 (LSE No. 2) is presented. The various LSEs are part of ERDA's Solar Total Energy Program (STES) and a separate activity of the National Solar Thermal Power Systems Program. The object of this LSE is to design, construct, test, evaluate and operate a STES for the purpose of obtaining experience with large scale hardware systems and to establish engineering capability for subsequent demonstration projects. This particular LSE is to be located at Shenandoah, Georgia, and will provide power to the Bleyle knitwear factory. The Solar Total Energy system is sized to supply 1.720 MW thermal power and 383.6 KW electrical power. The STES is sized for the extended knitwear plant of 3902 M/sup 2/ (42,000 sq-ft) which will eventually employ 300 people. The details of studies conducted for Phase II of the Solar Total Energy System (STES) for the conceptual design requirements of the facility are presented. Included in this section are the detailed descriptions and analyses of the following subtasks: facility concept design, system concept design, performance analysis, operation plan, component and subsystem development, procurement plan, cost estimating and scheduling, and technical and management plans. (WHK)

None,

1977-10-17T23:59:59.000Z

323

Large Bore Powder Gun Qualification (U)  

Science Conference Proceedings (OSTI)

A Large Bore Powder Gun (LBPG) is being designed to enable experimentalists to characterize material behavior outside the capabilities of the NNSS JASPER and LANL TA-55 PF-4 guns. The combination of these three guns will create a capability to conduct impact experiments over a wide range of pressures and shock profiles. The Large Bore Powder Gun will be fielded at the Nevada National Security Site (NNSS) U1a Complex. The Complex is nearly 1000 ft below ground with dedicated drifts for testing, instrumentation, and post-shot entombment. To ensure the reliability, safety, and performance of the LBPG, a qualification plan has been established and documented here. Requirements for the LBPG have been established and documented in WE-14-TR-0065 U A, Large Bore Powder Gun Customer Requirements. The document includes the requirements for the physics experiments, the gun and confinement systems, and operations at NNSS. A detailed description of the requirements is established in that document and is referred to and quoted throughout this document. Two Gun and Confinement Systems will be fielded. The Prototype Gun will be used primarily to characterize the gun and confinement performance and be the primary platform for qualification actions. This gun will also be used to investigate and qualify target and diagnostic modifications through the life of the program (U1a.104 Drift). An identical gun, the Physics Gun, will be fielded for confirmatory and Pu experiments (U1a.102D Drift). Both guns will be qualified for operation. The Gun and Confinement System design will be qualified through analysis, inspection, and testing using the Prototype Gun for the majority of process. The Physics Gun will be qualified through inspection and a limited number of qualification tests to ensure performance and behavior equivalent to the Prototype gun. Figure 1.1 shows the partial configuration of U1a and the locations of the Prototype and Physics Gun/Confinement Systems.

Rabern, Donald A. [Los Alamos National Laboratory; Valdiviez, Robert [Los Alamos National Laboratory

2012-04-02T23:59:59.000Z

324

Lessons from Large-Scale Renewable Energy Integration Studies: Preprint  

Science Conference Proceedings (OSTI)

In general, large-scale integration studies in Europe and the United States find that high penetrations of renewable generation are technically feasible with operational changes and increased access to transmission. This paper describes other key findings such as the need for fast markets, large balancing areas, system flexibility, and the use of advanced forecasting.

Bird, L.; Milligan, M.

2012-06-01T23:59:59.000Z

325

Managing very large distributed data sets on a data grid  

Science Conference Proceedings (OSTI)

In this work we address the management of very large data sets, which need to be stored and processed across many computing sites. The motivation for our work is the ATLAS experiment for the Large Hadron Collider (LHC), where the authors have been involved ... Keywords: data management, distributed systems, grid computing, modelling, simulation

Miguel Branco; Ed Zaluska; David de Roure; Mario Lassnig; Vincent Garonne

2010-08-01T23:59:59.000Z

326

Integrative path planning and motion control for handling large components  

Science Conference Proceedings (OSTI)

For handling large components a large workspace and high precision are required. In order to simplify the path planning for automated handling systems, this task can be divided into global, regional and local motions. Accordingly, different types of ... Keywords: integrative production, motion control, path planning, robotic assembly application

Rainer Müller; Martin Esser; Markus Janssen

2011-12-01T23:59:59.000Z

327

Large-Scale Parallel Computing of Cloud Resolving Storm Simulator  

Science Conference Proceedings (OSTI)

A sever thunderstorm is composed of strong convective clouds. In order to perform a simulation of this type of storms, a very finegrid system is necessary to resolve individual convective clouds within a large domain. Since convective clouds are highly ...

Kazuhisa Tsuboki; Atsushi Sakakibara

2002-05-01T23:59:59.000Z

328

Conte Large Flume | Open Energy Information  

Open Energy Info (EERE)

Conte Large Flume Conte Large Flume Overseeing Organization United States Geological Survey, LSC Hydrodynamic Testing Facility Type Flume Length(m) 38.1 Beam(m) 6.1 Depth(m) 5.2 Cost(per day) Contact POC Towing Capabilities Towing Capabilities None Wavemaking Capabilities Wavemaking Capabilities None Channel/Tunnel/Flume Channel/Tunnel/Flume Yes Recirculating No Wind Capabilities Wind Capabilities None Control and Data Acquisition Description National Instruments LabView and other data acquisition systems Number of channels 12 Bandwidth(kHz) 44 Cameras Yes Number of Color Cameras 5 Description of Camera Types Conventional underwater video, 4; high speed (1000 fps), 1 Available Sensors Displacement, Flow, Pressure Range(psi), Thermal, Turbulence, Velocity Data Generation Capability

329

Large Magnetization at Carbon Surfaces  

NLE Websites -- All DOE Office Websites (Extended Search)

Large Magnetization at Carbon Large Magnetization at Carbon Surfaces Large Magnetization at Carbon Surfaces Print Wednesday, 31 August 2011 00:00 From organic matter to pencil lead, carbon is a versatile element. Now, another use has been found: magnets. One would not expect pure carbon to be magnetic, but for more than ten years scientists have suspected that carbon can be made to be magnetic by doping it with nonmagnetic materials, changing its order ever so slightly. Years ago, the first x-ray images obtained using the scanning transmission x-ray microscope at ALS Beamline 11.0.2 provided valuable insight into how proton irradiation can cause carbon to transform into a ferromagnetic material. Now, researchers are using x-ray spectroscopy at ALS Beamline 4.0.2 to study the magnetism of proton-irradiated graphite surfaces in order to understand the effects of hydrogen (i.e. protons) on the electronic structure of carbon. In studying the properties of electrons responsible for magnetic order in graphite, researchers found that a very large magnetic moment is essentially switched on when hydrogen atoms are incorporated at the surface of graphite.

330

Splitting and Confirming Large File  

NLE Websites -- All DOE Office Websites (Extended Search)

Splitting and Confirming Large File Splitting and Confirming Large File Name: Bradley C. Status: Student Age: 16 Location: N/A Country: N/A Date: June 2003 Question: I just calculated one billion digits of pi on my PC, how do I confirm them? I cannot access them because the file size is 1.28 GB, my ram is only 512 MB, meaning none of my word processor's will touch it. Is it possible to split the document, somehow? Then how do I confirm the digits? Replies: Checking the correctness of large numbers -- transcendental numbers like 'pi', or a large prime -- is not easy because there are many sources of error that are difficult to detect, or track down. Some, but by no means all are: 1. How "good" (that is convergent) is the algorithm? If, for example the algorithm is some sort of infinite series, there is always a truncation error, because you cannot compute an infinite number of terms in a finite amount of time. The further out you go in the algorithm, the more significant these errors become.

331

Fast segmentation of large images  

Science Conference Proceedings (OSTI)

The processing of large images is a generic problem in wide area surveillance. An important difficulty is that many image processing algorithms are global rather than local and hence can be infeasible due to the required computing time or memory resources ... Keywords: algorithm, image, segmentation

David J. Crisp; Peter Perry; Nicholas J. Redding

2003-02-01T23:59:59.000Z

332

Stochastic aspects of nuclear large amplitude motion  

Science Conference Proceedings (OSTI)

A consistent description of the macroscopic large amplitude dynamics and processes of internal excitation of a nucleus is suggested. The cranking model approach is used for the calculation of the response function of the nucleus in a moving frame. Using spectral statistics smearing, the collective mass, friction, and diffusion coefficients are derived. The relation of the response function in a moving frame to the correlation function in a classical chaotic system is established. The rate of dissipation due to the Landau-Zener transitions and through the Kubo mechanism is considered.

Kolomietz, V.M. [Institute for Nuclear Research, 252028 Kiev, Ukraine and Cyclotron Institute, Texas A& M University, College Station, Texas 77843 (United States)] [Institute for Nuclear Research, 252028 Kiev, Ukraine and Cyclotron Institute, Texas A& M University, College Station, Texas 77843 (United States)

1995-08-01T23:59:59.000Z

333

Proposal to produce large compact toroids  

SciTech Connect

Relatively large, hot compact toroids might be produced in the annular space between two concentric one-turn coils. With currents in the two coils flowing in the same direction, the magnetic fields on each side of the plasma are in opposite directions. As the fields are raised, the plasma ring is heated and compressed radially towards the center of the annular space. By the addition of two sets of auxiliary coils, the plasma ring can be ejected out one end of the two-coil system into a long axial magnetic field.

Phillips, J.A.

1981-03-01T23:59:59.000Z

334

2 Large-Scale Data Sets  

E-Print Network (OSTI)

help in preparing this material. Computational Science ? Use of computer simulation as a tool for greater understanding of the real world – Complements experimentation and theory ? Problems are increasingly computationally challenging – Large parallel machines needed to perform calculations – Critical to leverage parallelism in all phases ? Data access is a huge challenge – Using parallelism to obtain performance – Finding usable, efficient, portable interfaces – Understanding and tuning I/O IBM BG/L system. Visualization of entropy in Terascale Supernova Initiative application. Image from Kwan-Liu Ma’s visualization team at UC Davis. Argonne National

Rob Ross; Thanks To Rob Latham; Rajeev Thakur; Marc Unangst; Brent Welch For Their

2009-01-01T23:59:59.000Z

335

Large-Scale PV Integration Study  

DOE Green Energy (OSTI)

This research effort evaluates the impact of large-scale photovoltaic (PV) and distributed generation (DG) output on NV Energy’s electric grid system in southern Nevada. It analyzes the ability of NV Energy’s generation to accommodate increasing amounts of utility-scale PV and DG, and the resulting cost of integrating variable renewable resources. The study was jointly funded by the United States Department of Energy and NV Energy, and conducted by a project team comprised of industry experts and research scientists from Navigant Consulting Inc., Sandia National Laboratories, Pacific Northwest National Laboratory and NV Energy.

Lu, Shuai; Etingov, Pavel V.; Diao, Ruisheng; Ma, Jian; Samaan, Nader A.; Makarov, Yuri V.; Guo, Xinxin; Hafen, Ryan P.; Jin, Chunlian; Kirkham, Harold; Shlatz, Eugene; Frantzis, Lisa; McClive, Timothy; Karlson, Gregory; Acharya, Dhruv; Ellis, Abraham; Stein, Joshua; Hansen, Clifford; Chadliev, Vladimir; Smart, Michael; Salgo, Richard; Sorensen, Rahn; Allen, Barbara; Idelchik, Boris

2011-07-29T23:59:59.000Z

336

large hydro | OpenEI  

Open Energy Info (EERE)

large hydro large hydro Dataset Summary Description The Planning Database Project provides the UK Department of Energy and Climate Change (DECC) with regular data to track progress towards achieving EU targets for electricity generation from renewable energy (RE) sources. Extracts from the database are available each month. Information collected in the database includes: name, location and installed capacity of RE projects over 0.1MW; environmental designations; planning status; and construction status. Included here is the October 2010 Progress Datasheet, and an extract from December, 15, 2010 (i.e. Source UK Department of Energy and Climate Change (DECC) Date Released December 15th, 2010 (3 years ago) Date Updated Unknown Keywords biomass co-firing installed capacity

337

Alaska's At-large congressional district: Energy Resources | Open Energy  

Open Energy Info (EERE)

Alaska's At-large congressional district: Energy Resources Alaska's At-large congressional district: Energy Resources Jump to: navigation, search Equivalent URI DBpedia This article is a stub. You can help OpenEI by expanding it. This page represents a congressional district in Alaska. Registered Energy Companies in Alaska's At-large congressional district ABS Alaskan Inc Alaskan Wind Industries Four Dam Pool Power Agency FDPPA Kodiak Electric Association KEA Remote Power Inc. Sustina Energy Systems Wind Energy Alaska Energy Generation Facilities in Alaska's At-large congressional district Chena Hot Springs Geothermal Facility Utility Companies in Alaska's At-large congressional district Alaska Energy Authority Retrieved from "http://en.openei.org/w/index.php?title=Alaska%27s_At-large_congressional_district&oldid=174110"

338

Large Magnetization at Carbon Surfaces  

NLE Websites -- All DOE Office Websites (Extended Search)

Large Magnetization at Carbon Surfaces Print Large Magnetization at Carbon Surfaces Print From organic matter to pencil lead, carbon is a versatile element. Now, another use has been found: magnets. One would not expect pure carbon to be magnetic, but for more than ten years scientists have suspected that carbon can be made to be magnetic by doping it with nonmagnetic materials, changing its order ever so slightly. Years ago, the first x-ray images obtained using the scanning transmission x-ray microscope at ALS Beamline 11.0.2 provided valuable insight into how proton irradiation can cause carbon to transform into a ferromagnetic material. Now, researchers are using x-ray spectroscopy at ALS Beamline 4.0.2 to study the magnetism of proton-irradiated graphite surfaces in order to understand the effects of hydrogen (i.e. protons) on the electronic structure of carbon. In studying the properties of electrons responsible for magnetic order in graphite, researchers found that a very large magnetic moment is essentially switched on when hydrogen atoms are incorporated at the surface of graphite.

339

Large Magnetization at Carbon Surfaces  

NLE Websites -- All DOE Office Websites (Extended Search)

Large Magnetization at Carbon Surfaces Print Large Magnetization at Carbon Surfaces Print From organic matter to pencil lead, carbon is a versatile element. Now, another use has been found: magnets. One would not expect pure carbon to be magnetic, but for more than ten years scientists have suspected that carbon can be made to be magnetic by doping it with nonmagnetic materials, changing its order ever so slightly. Years ago, the first x-ray images obtained using the scanning transmission x-ray microscope at ALS Beamline 11.0.2 provided valuable insight into how proton irradiation can cause carbon to transform into a ferromagnetic material. Now, researchers are using x-ray spectroscopy at ALS Beamline 4.0.2 to study the magnetism of proton-irradiated graphite surfaces in order to understand the effects of hydrogen (i.e. protons) on the electronic structure of carbon. In studying the properties of electrons responsible for magnetic order in graphite, researchers found that a very large magnetic moment is essentially switched on when hydrogen atoms are incorporated at the surface of graphite.

340

Large Magnetization at Carbon Surfaces  

NLE Websites -- All DOE Office Websites (Extended Search)

Large Magnetization at Carbon Surfaces Print Large Magnetization at Carbon Surfaces Print From organic matter to pencil lead, carbon is a versatile element. Now, another use has been found: magnets. One would not expect pure carbon to be magnetic, but for more than ten years scientists have suspected that carbon can be made to be magnetic by doping it with nonmagnetic materials, changing its order ever so slightly. Years ago, the first x-ray images obtained using the scanning transmission x-ray microscope at ALS Beamline 11.0.2 provided valuable insight into how proton irradiation can cause carbon to transform into a ferromagnetic material. Now, researchers are using x-ray spectroscopy at ALS Beamline 4.0.2 to study the magnetism of proton-irradiated graphite surfaces in order to understand the effects of hydrogen (i.e. protons) on the electronic structure of carbon. In studying the properties of electrons responsible for magnetic order in graphite, researchers found that a very large magnetic moment is essentially switched on when hydrogen atoms are incorporated at the surface of graphite.

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Large Component Removal/Disposal  

Science Conference Proceedings (OSTI)

This paper describes the removal and disposal of the large components from Maine Yankee Atomic Power Plant. The large components discussed include the three steam generators, pressurizer, and reactor pressure vessel. Two separate Exemption Requests, which included radiological characterizations, shielding evaluations, structural evaluations and transportation plans, were prepared and issued to the DOT for approval to ship these components; the first was for the three steam generators and one pressurizer, the second was for the reactor pressure vessel. Both Exemption Requests were submitted to the DOT in November 1999. The DOT approved the Exemption Requests in May and July of 2000, respectively. The steam generators and pressurizer have been removed from Maine Yankee and shipped to the processing facility. They were removed from Maine Yankee's Containment Building, loaded onto specially designed skid assemblies, transported onto two separate barges, tied down to the barges, th en shipped 2750 miles to Memphis, Tennessee for processing. The Reactor Pressure Vessel Removal Project is currently under way and scheduled to be completed by Fall of 2002. The planning, preparation and removal of these large components has required extensive efforts in planning and implementation on the part of all parties involved.

Wheeler, D. M.

2002-02-27T23:59:59.000Z

342

Large Magnetization at Carbon Surfaces  

NLE Websites -- All DOE Office Websites (Extended Search)

Large Magnetization at Carbon Surfaces Print Large Magnetization at Carbon Surfaces Print From organic matter to pencil lead, carbon is a versatile element. Now, another use has been found: magnets. One would not expect pure carbon to be magnetic, but for more than ten years scientists have suspected that carbon can be made to be magnetic by doping it with nonmagnetic materials, changing its order ever so slightly. Years ago, the first x-ray images obtained using the scanning transmission x-ray microscope at ALS Beamline 11.0.2 provided valuable insight into how proton irradiation can cause carbon to transform into a ferromagnetic material. Now, researchers are using x-ray spectroscopy at ALS Beamline 4.0.2 to study the magnetism of proton-irradiated graphite surfaces in order to understand the effects of hydrogen (i.e. protons) on the electronic structure of carbon. In studying the properties of electrons responsible for magnetic order in graphite, researchers found that a very large magnetic moment is essentially switched on when hydrogen atoms are incorporated at the surface of graphite.

343

Innovative Approaches to Large Component Packaging  

Science Conference Proceedings (OSTI)

Radioactive waste disposal often times requires creative approaches in packaging design, especially for large components. Innovative design techniques are required to meet the needs for handling, transporting, and disposing of these large packages. Large components (i.e., Reactor Pressure Vessel (RPV) heads and even RPVs themselves) require special packaging for shielding and contamination control, as well as for transport and disposal. WMG Inc designed and used standard packaging for RPV heads without control rod drive mechanisms (CRDMs) attached for five RPV heads and has also more recently met an even bigger challenge and developed the innovative Intact Vessel Head Transport System (IVHTS) for RPV heads with CRDMs intact. This packaging system has been given a manufacturer's exemption by the United States Department of Transportation (USDOT) for packaging RPV heads. The IVHTS packaging has now been successfully used at two commercial nuclear power plants. Another example of innovative packaging is the large component packaging that WMG designed, fabricated, and utilized at the West Valley Demonstration Project (WVDP). In 2002, West Valley's high-level waste vitrification process was shut down in preparation for D and D of the West Valley Vitrification Facility. Three of the major components of concern within the Vitrification Facility were the Melter, the Concentrate Feed Makeup Tank (CFMT), and the Melter Feed Holdup Tank (MFHT). The removal, packaging, and disposition of these three components presented significant radiological and handling challenges for the project. WMG designed, fabricated, and installed special packaging for the transport and disposal of each of these three components, which eliminated an otherwise time intensive and costly segmentation process that WVDP was considering. Finally, WMG has also designed and fabricated special packaging for both the Connecticut Yankee (CY) and San Onofre Nuclear Generating Station (SONGS) RPVs. This paper presents the approach that has been successfully used for planning, implementing, and preparing for the disposition of large components such as those mentioned previously. It addresses the major regulatory and design requirements for packaging, transporting, and disposing of these components. The specific topics that are covered include radiological characterization, shielding, packaging design, on-site handling and movement, off-site transportation options, a brief discussion on disposition, and lessons learned. (authors)

Freitag, A.; Hooper, M.; Posivak, E.; Sullivan, J. [WMG, Inc., Peekskill, NY 10566 (United States)

2006-07-01T23:59:59.000Z

344

the Large Aperture GRB Observatory  

SciTech Connect

The Large Aperture GRB Observatory (LAGO) aims at the detection of high energy photons from Gamma Ray Bursts (GRB) using the single particle technique (SPT) in ground based water Cherenkov detectors (WCD). To reach a reasonable sensitivity, high altitude mountain sites have been selected in Mexico (Sierra Negra, 4550 m a.s.l.), Bolivia (Chacaltaya, 5300 m a.s.l.) and Venezuela (Merida, 4765 m a.s.l.). We report on the project progresses and the first operation at high altitude, search for bursts in 6 months of preliminary data, as well as search for signal at ground level when satellites report a burst.

Bertou, Xavier [Centro Atomico Bariloche (Argentina)

2009-04-30T23:59:59.000Z

345

Aggregation in Large Dynamic Panels  

E-Print Network (OSTI)

;, and as = E (w0#8;s#28; ) = E(#21;s). Hence, for su¢ ciently large N and T , the distributed lag coe¢ cients can be consistently estimated by bas = 1N PN i=1 b#21;si , where b#21;i is the least square estimator of #21;i in the autoregressions (30... ). The distribution F#21; is not the same as the distribution of b#21;i when T is ?nite, but bas is consistent at least when T ! 1 followed by N ! 1. Both the aggregate and the disaggregate estimators are biased when T is small. Initially, we also report the estimates...

Pesaran, M. Hashem; Chudik, Alexander

2011-01-31T23:59:59.000Z

346

The Large Aperture GRB Observatory  

E-Print Network (OSTI)

The Large Aperture GRB Observatory (LAGO) is aiming at the detection of the high energy (around 100 GeV) component of Gamma Ray Bursts, using the single particle technique in arrays of Water Cherenkov Detectors (WCD) in high mountain sites (Chacaltaya, Bolivia, 5300 m a.s.l., Pico Espejo, Venezuela, 4750 m a.s.l., Sierra Negra, Mexico, 4650 m a.s.l). WCD at high altitude offer a unique possibility of detecting low gamma fluxes in the 10 GeV - 1 TeV range. The status of the Observatory and data collected from 2007 to date will be presented.

Allard, D; Asorey, H; Barros, H; Bertou, X; Castillo, M; Chirinos, J M; De Castro, A; Flores, S; González, J; Berisso, M Gomez; Grajales, J; Guada, C; Day, W R Guevara; Ishitsuka, J; López, J A; Martínez, O; Melfo, A; Meza, E; Loza, P Miranda; Barbosa, E Moreno; Murrugarra, C; Núñez, L A; Ormachea, L J Otiniano; Pérez, G; Perez, Y; Ponce, E; Quispe, J; Quintero, C; Rivera, H; Rosales, M; Rovero, A C; Saavedra, O; Salazar, H; Tello, J C; Peralda, R Ticona; Varela, E; Velarde, A; Villaseñor, L; Wahl, D; Zamalloa, M A

2009-01-01T23:59:59.000Z

347

GE to DOE General Counsel; Re:Request for Comment on Large Capacity...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

DOE General Counsel; Re:Request for Comment on Large Capacity Clothes Washers Alliance Laundry Systems to DOE General Counsel; Re:Request for Comment on Large Capacity Clothes...

348

Director's colloquium March 18 large hadron collider  

NLE Websites -- All DOE Office Websites (Extended Search)

Director's colloquium large hadron collider Director's colloquium March 18 large hadron collider Lyndon Evans of CERN will talk about the most complex scientific instrument ever...

349

Large Scale Quantum-mechanical Calculations of Proteins, Nanomaterials and  

NLE Websites -- All DOE Office Websites (Extended Search)

Large Scale Quantum-mechanical Calculations of Proteins, Nanomaterials and Large Scale Quantum-mechanical Calculations of Proteins, Nanomaterials and Other Large Systems Event Sponsor: Leadership Computing Facility Seminar Start Date: Dec 5 2013 - 2:00pm Building/Room: Building 240/Room 4301 Location: Argonne National Laboratory Speaker(s): Dmitri G. Fedorov Speaker(s) Title: National Institute of Advanced Industrial Science and Technology (AIST) Host: Yuri Alexeev Our approach to large scale calculations is based on fragmenting a molecular system into pieces, and performing quantum-mechanical calculations of these fragments and their pairs in the fragment molecular orbital method (FMO). After a brief summary of the methodology, some typical applications to protein-ligand complexes, chemical reactions in explicit solvent, and nanomaterials (silicon nanowires, zeolites.

350

Analysis of large urban fires  

SciTech Connect

Fires in urban areas caused by a nuclear burst are analyzed as a first step towards determining their smoke-generation chacteristics, which may have grave implications for global-scale climatic consequences. A chain of events and their component processes which would follow a nuclear attack are described. A numerical code is currently being developed to calculate ultimately the smoke production rate for a given attack scenario. Available models for most of the processes are incorporated into the code. Sample calculations of urban fire-development history performed in the code for an idealized uniform city are presented. Preliminary results indicate the importance of the wind, thermal radiation transmission, fuel distributions, and ignition thresholds on the urban fire spread characteristics. Future plans are to improve the existing models and develop new ones to characterize smoke production from large urban fires. 21 references, 18 figures.

Kang, S.W.; Reitter, T.A.; Takata, A.N.

1984-11-01T23:59:59.000Z

351

A LARGE BAKEABLE VACUUM VALVE  

SciTech Connect

The development and design of a large bakeable valve based on a unique seat arrangement and a novel motion seal are described. The seat sealing is accomplished through the use of high pressure fluid actuation of an annular pinch gasket. Experimental data on seat closure performance, and the specific design features to achieve successful closures, are presented. The bakeable motion seal utilizes a stainless steel bellows sleeving over an inner concentric actuating shaft. This shaft is bent at 90 deg to the axis of rotation and is free to rotate relative to the bellows. There is no apparent size limitation to this type of actuation. The design of a 10-inch gate valve utilizing these principles is described. (auth)

Batzer, T.H.

1959-08-01T23:59:59.000Z

352

Montana's At-large congressional district: Energy Resources | Open Energy  

Open Energy Info (EERE)

Montana's At-large congressional district: Energy Resources Montana's At-large congressional district: Energy Resources Jump to: navigation, search Equivalent URI DBpedia This article is a stub. You can help OpenEI by expanding it. This page represents a congressional district in Montana. Registered Research Institutions in Montana's At-large congressional district Big Sky Carbon Sequestration Partnership Registered Policy Organizations in Montana's At-large congressional district National Center for Appropriate Technology Registered Energy Companies in Montana's At-large congressional district Bioroot Energy Business Excellence Consulting Confluence Communications Grasslands Renewable Energy LLC Montana Sustainable Building Systems REC Silicon formerly ASiMI Rivertop Renewables Saddlehorn Sage Resources Semitool Inc SolarMission Technologies Inc

353

Wyoming's At-large congressional district: Energy Resources | Open Energy  

Open Energy Info (EERE)

Wyoming's At-large congressional district: Energy Resources Wyoming's At-large congressional district: Energy Resources Jump to: navigation, search Equivalent URI DBpedia This article is a stub. You can help OpenEI by expanding it. This page represents a congressional district in Wyoming. US Recovery Act Smart Grid Projects in Wyoming's At-large congressional district Cheyenne Light, Fuel and Power Company Smart Grid Project Powder River Energy Corporation Smart Grid Project Registered Energy Companies in Wyoming's At-large congressional district Blue Sky Batteries Inc Blue Sky Group Inc HTH Wind Energy Inc LappinTech LLC Nacel Energy Nanomaterials Discovery Corporation NDC Pathfinder Renewable Wind Energy PowerSHIFT Energy Company Inc TMA Global Wind Energy Systems TriLateral Energy LLC Utility Companies in Wyoming's At-large congressional district

354

Large deviations principles of Non-Freidlin-Wentzell type  

E-Print Network (OSTI)

Generalized Large deviation principles of Non-Freidlin-Wentzell type was developed for weakly time inhomogeneous diffusions prove to be key tools for a treatment of the problem of diffusion exit from a domain and thus for the approach of stochastic resonance via transition probabilities between meta-stable states. We expand the classical theory of large deviations for randomly perturbed dynamical systems developed by Freidlin and Wentzell.

Jaykov Foukzon

2008-03-14T23:59:59.000Z

355

Aging assessment of large electric motors in nuclear power plants  

Science Conference Proceedings (OSTI)

Large electric motors serve as the prime movers to drive high capacity pumps, fans, compressors, and generators in a variety of nuclear plant systems. This study examined the stressors that cause degradation and aging in large electric motors operating in various plant locations and environments. The operating history of these machines in nuclear plant service was studied by review and analysis of failure reports in the NPRDS and LER databases. This was supplemented by a review of motor designs, and their nuclear and balance of plant applications, in order to characterize the failure mechanisms that cause degradation, aging, and failure in large electric motors. A generic failure modes and effects analysis for large squirrel cage induction motors was performed to identify the degradation and aging mechanisms affecting various components of these large motors, the failure modes that result, and their effects upon the function of the motor. The effects of large motor failures upon the systems in which they are operating, and on the plant as a whole, were analyzed from failure reports in the databases. The effectiveness of the industry`s large motor maintenance programs was assessed based upon the failure reports in the databases and reviews of plant maintenance procedures and programs.

Villaran, M.; Subudhi, M. [Brookhaven National Lab., Upton, NY (United States)

1996-03-01T23:59:59.000Z

356

Duct thermal performance models for large commercial buildings  

SciTech Connect

Despite the potential for significant energy savings by reducing duct leakage or other thermal losses from duct systems in large commercial buildings, California Title 24 has no provisions to credit energy-efficient duct systems in these buildings. A substantial reason is the lack of readily available simulation tools to demonstrate the energy-saving benefits associated with efficient duct systems in large commercial buildings. The overall goal of the Efficient Distribution Systems (EDS) project within the PIER High Performance Commercial Building Systems Program is to bridge the gaps in current duct thermal performance modeling capabilities, and to expand our understanding of duct thermal performance in California large commercial buildings. As steps toward this goal, our strategy in the EDS project involves two parts: (1) developing a whole-building energy simulation approach for analyzing duct thermal performance in large commercial buildings, and (2) using the tool to identify the energy impacts of duct leakage in California large commercial buildings, in support of future recommendations to address duct performance in the Title 24 Energy Efficiency Standards for Nonresidential Buildings. The specific technical objectives for the EDS project were to: (1) Identify a near-term whole-building energy simulation approach that can be used in the impacts analysis task of this project (see Objective 3), with little or no modification. A secondary objective is to recommend how to proceed with long-term development of an improved compliance tool for Title 24 that addresses duct thermal performance. (2) Develop an Alternative Calculation Method (ACM) change proposal to include a new metric for thermal distribution system efficiency in the reporting requirements for the 2005 Title 24 Standards. The metric will facilitate future comparisons of different system types using a common ''yardstick''. (3) Using the selected near-term simulation approach, assess the impacts of duct system improvements in California large commercial buildings, over a range of building vintages and climates. This assessment will provide a solid foundation for future efforts that address the energy efficiency of large commercial duct systems in Title 24. This report describes our work to address Objective 1, which includes a review of past modeling efforts related to duct thermal performance, and recommends near- and long-term modeling approaches for analyzing duct thermal performance in large commercial buildings.

Wray, Craig P.

2003-10-01T23:59:59.000Z

357

Sealing Ducts in Large Commercial Buildings with Aerosolized Sealant Particles  

NLE Websites -- All DOE Office Websites (Extended Search)

2414 2414 1 Sealing Ducts in Large Commercial Buildings with Aerosolized Sealant Particles M. P. Modera, O. Brzozowski ** , F. R. Carrié * , D. J. Dickerhoff, W. W. Delp, W. J. Fisk, R. Levinson, D. Wang Abstract Electricity energy savings potential by eliminating air leakage from ducts in large commercial buildings is on the order of 10 kWh/m 2 per year (1 kWh/ft 2 ). We have tested, in two large commercial buildings, a new technology that simultaneously seals duct leaks and measures effective leakage area of ducts. The technology is based upon injecting a fog of aerosolized sealant particles into a pressurized duct system. In brief, this process involves blocking all of the intentional openings in a duct system (e.g., diffusers). Therefore, when the system is pressurized, the only place for the air carrying the aerosol

358

Large electrical-energy storage facilities  

SciTech Connect

Problems associated with the utilization of various types of energy-storage facilities are considered, three areas being singled out: operation during the variable portion of the load curve with double regulation effect, handling of peaks and the filling in of off-peak dips in the load curve; the generation of power impulses through the use of stored energy for short-term supply of load; and the conversion of one form of energy to another. The present-day state of development and introduction of storage facilities of various kinds is described. The conditions for utilization of large-scale storage on the power systems of the USSR are evaluated, and the principles for determining the economic efficiency are formulated.

Ershevich, V.V.

1985-01-01T23:59:59.000Z

359

Large area liquid argon detectors for interrogation systems  

SciTech Connect

Measurements of the efficiency, pulse shape, and energy and time resolution of liquid argon (LAr) detectors are presented. Liquefied noble gas-based (LNbG) detectors have been developed for the detection of dark matter and neutrinoless double-beta decay. However, the same qualities that make LNbG detectors ideal for these applications, namely their size, cost, efficiency, pulse shape discrimination and resolution, make them promising for portal screening and the detection of Special Nuclear Materials (SNM). Two 18-liter prototype detectors were designed, fabricated, and tested, one with pure LAr and the other doped with liquid Xe (LArXe). The LArXe detector presented the better time and energy resolution of 3.3 ns and 20% at 662 KeV, respectively. The total efficiency of the detector was measured to be 35% with 4.5% of the total photons detected in the photopeak.

Gary, Charles; Kane, Steve; Firestone, Murray I.; Smith, Gregory [Adelphi Technology LLC, Purdue Technology Center, 5225 Exploration Drive, Indianapolis, IN 46241 (United States); Gozani, Tsahi; Brown, Craig; Kwong, John; King, Michael J. [Rapiscan Laboratories, 520 Almanor Avenue, Sunnyvale, CA 94085 (United States); Nikkel, James A.; McKinsey, Dan [Physics Department, Yale University, New Haven, CT 06520 (United States)

2013-04-19T23:59:59.000Z

360

Performance of thermal distribution systems in large commercial buildings  

E-Print Network (OSTI)

sizing and design, e.g. , excessive fan-power requirement,fan-power and energy savings could be realized by better design

Xu, T.

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Large Scale Geothermal Exchange System for Residential, Office...  

Open Energy Info (EERE)

a 10 year effort to clean up a former paper manufacturing operation. Impacts River-based heat exchanger design offers potential to reduce GHP installation costs lower than more...

362

Energy and Spectral Efficiency of Very Large Multiuser MIMO Systems  

E-Print Network (OSTI)

A multiplicity of autonomous terminals simultaneously transmits data streams to a compact array of antennas. The array uses imperfect channel-state information derived from transmitted pilots to extract the individual data streams. The power radiated by the terminals can be made inversely proportional to the square-root of the number of base station antennas with no reduction in performance. In contrast if perfect channel-state information were available the power could be made inversely proportional to the number of antennas. Lower capacity bounds for maximum-ratio combining (MRC), zero-forcing (ZF) and minimum mean-square error (MMSE) detection are derived. A MRC receiver normally performs worse than ZF and MMSE. However as power levels are reduced, the cross-talk introduced by the inferior maximum-ratio receiver eventually falls below the noise level and this simple receiver becomes a viable option. The tradeoff between the energy efficiency (as measured in bits/J) and spectral efficiency (as measured in b...

Ngo, Hien Quoc; Marzetta, Thomas L

2011-01-01T23:59:59.000Z

363

Photovoltaic generator modeling for large scale distribution system studies.  

E-Print Network (OSTI)

??Geographic regions with favorable conditions for photovoltaic (PHV) power generation are seeing increasing numbers of three-phase commercial installations and single-phase residential sized installations. PHV sources… (more)

Golder, Andrew S.

2007-01-01T23:59:59.000Z

364

Web-based energy information systems for large commercial buildings  

E-Print Network (OSTI)

Summary: Benchmark: Sub metering: Real-time: DRP bidding:interval meters, EMCS, and sub-metering, as described below.Sub DRP Real Remote Rate Summary download profile marking metering

Motegi, Naoya; Piette, Mary Ann

2003-01-01T23:59:59.000Z

365

Large scale solar hot water heating systems for green hospital  

Science Conference Proceedings (OSTI)

Concerns over the impact of the environment on the massive usage of fossil fuels, combined with soaring energy prices, triggered increased interest in the use of solar energy. Solar energy is abundant, provides an important saving to the consumer, and ... Keywords: energy savings, evacuated tubes, greenhouse gas reduction, solar assisted hot water heaters

Poorya Ooshaksaraei; Baharudin Ali; Sohif Mat; M. Yahya; Kamaruzaman Ibrahim; Azami Zaharim; Kamaruzaman Sopian

2010-01-01T23:59:59.000Z

366

Comparison of emerging diagnostic tools for large commercial HVAC systems  

E-Print Network (OSTI)

handlers, cooling plants (cooling towers, chillers), heatingBoiler: see general Cooling tower (CT) capacity ENFORMA

Friedman, Hannah; Piette, Mary Ann

2001-01-01T23:59:59.000Z

367

Performance of thermal distribution systems in large commercial buildings  

E-Print Network (OSTI)

Air Leakage, and Heat Conduction Gains." Final Report ofof air leakage and heat conduction may lead to inappropriatethermal losses due to heat conduction through duct walls

Xu, T.

2011-01-01T23:59:59.000Z

368

Comparison of emerging diagnostic tools for large commercial HVAC systems  

E-Print Network (OSTI)

Manual Diagnostic Tools • ENFORMA ® Portable Diagnostic Solutions (ENFORMA software), Architectural Energy Corporation (AEC) (

Friedman, Hannah; Piette, Mary Ann

2001-01-01T23:59:59.000Z

369

A survey of packages for large linear systems  

E-Print Network (OSTI)

Technical Report SAND99-8231, Sandia National Laboratories,Technical Report SAND95- 1559, Sandia National Laboratories,a group of scientists from Sandia National Laboratories, Ray

Wu, Kesheng; Milne, Brent

2000-01-01T23:59:59.000Z

370

Storage and retrieval of large digital images  

DOE Patents (OSTI)

Image compression and viewing are implemented with (1) a method for performing DWT-based compression on a large digital image with a computer system possessing a two-level system of memory and (2) a method for selectively viewing areas of the image from its compressed representation at multiple resolutions and, if desired, in a client-server environment. The compression of a large digital image I(x,y) is accomplished by first defining a plurality of discrete tile image data subsets T{sub ij}(x,y) that, upon superposition, form the complete set of image data I(x,y). A seamless wavelet-based compression process is effected on I(x,y) that is comprised of successively inputting the tiles T{sub ij}(x,y) in a selected sequence to a DWT routine, and storing the resulting DWT coefficients in a first primary memory. These coefficients are periodically compressed and transferred to a secondary memory to maintain sufficient memory in the primary memory for data processing. The sequence of DWT operations on the tiles T{sub ij}(x,y) effectively calculates a seamless DWT of I(x,y). Data retrieval consists of specifying a resolution and a region of I(x,y) for display. The subset of stored DWT coefficients corresponding to each requested scene is determined and then decompressed for input to an inverse DWT, the output of which forms the image display. The repeated process whereby image views are specified may take the form an interaction with a computer pointing device on an image display from a previous retrieval. 6 figs.

Bradley, J.N.

1998-01-20T23:59:59.000Z

371

Key Findings from the NBI PIER Project: Optimization of Airside Design  

NLE Websites -- All DOE Office Websites (Extended Search)

Key Findings from the NBI PIER Project: Optimization of Airside Design Key Findings from the NBI PIER Project: Optimization of Airside Design Speaker(s): Mark Hydeman Date: April 29, 2004 - 12:00pm Location: Bldg. 90 Seminar Host/Point of Contact: Philip Haves Mark Hydeman, PE, Principal from Taylor Engineering will present key results from the NBI PIER research on built-up VAV systems for which he was the Principal Investigator. These include the potential for supply pressure reset for energy savings and to prevent operation in surge; a new way of modeling fan performance; and an optimized approach for selecting and controlling VAV boxes. The project produced a design guide on air-side VAV systems that is available from the CEC website at http://www.energy.ca.gov/reports/2003-11-17_500-03-082_A-11.PDF a new model for the evaluation of fan system design and controls and a series of

372

Solar Power in the Desert: Are the current large-scale solar developments really improving California’s environment?  

E-Print Network (OSTI)

from large-scale solar steam generator systems Persistenceof water as steam power generators. The largest of these

Allen, Michael F.; McHughen, Alan

2011-01-01T23:59:59.000Z

373

A Tractable Approach to Understanding the Results from Large-Scale 3D Transient  

E-Print Network (OSTI)

) problems or NASA's HPCC (High Performance Computing & Communication) grand challenges, can easily. Introduction Large-scale simulations of physical phenomena on high performance computing systems (often on mas

Peraire, Jaime

374

SLIC: an extensibility system for commodity operating systems  

Science Conference Proceedings (OSTI)

Modern commodity operating systems are large and complex systems developed over many years by large teams of programmers, containing hundreds of thousands of lines of code. Consequently, it is extremely difficult to add significant new functionality ...

Douglas P. Ghormley; David Petrou; Steven H. Rodrigues; Thomas E. Anderson

1998-06-01T23:59:59.000Z

375

Idaho Power - Large Commercial Custom Efficiency Program | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Large Commercial Custom Efficiency Program Large Commercial Custom Efficiency Program Idaho Power - Large Commercial Custom Efficiency Program < Back Eligibility Agricultural Commercial Industrial Savings Category Heating & Cooling Commercial Heating & Cooling Cooling Manufacturing Other Appliances & Electronics Commercial Lighting Lighting Maximum Rebate Commercial and Industrial: 70% of project cost Custom Incentive for Existing Irrigation System Replacement: up to 75% of the total project cost Custom Incentive for a New Irrigation System: up to 10% of the total project cost Program Info Funding Source Conservation Program Funding Charge State Idaho Program Type Utility Rebate Program Rebate Amount Commercial and Industrial: $0.12/kWh saved Agricultural Irrigation Efficiency: $0.25/annual kWh saved or $450/kW

376

Nuclear-pumped lasers for large-scale applications  

SciTech Connect

Efficient initiation of large-volume chemical lasers may be achieved by neutron induced reactions which produce charged particles in the final state. When a burst mode nuclear reactor is used as the neutron source, both a sufficiently intense neutron flux and a sufficiently short initiation pulse may be possible. Proof-of-principle experiments are planned to demonstrate lasing in a direct nuclear-pumped large-volume system; to study the effects of various neutron absorbing materials on laser performance; to study the effects of long initiation pulse lengths; to demonstrate the performance of large-scale optics and the beam quality that may be obtained; and to assess the performance of alternative designs of burst systems that increase the neutron output and burst repetition rate. 21 refs., 8 figs., 5 tabs.

Anderson, R.E.; Leonard, E.M.; Shea, R.F.; Berggren, R.R.

1989-05-01T23:59:59.000Z

377

Large-scale clustering and complete facet and tag calculation  

Science Conference Proceedings (OSTI)

The State and University Library of Denmark is developing an integrated search system called Summa, and as part of the Summa project a clustering module and a facet module. Simple clusters have been created for a collection of more than six and a half ... Keywords: categorisation, clustering, faceted browsing, large data sets, library metadata

Bolette Ammitzbøll Madsen

2007-09-01T23:59:59.000Z

378

Development of large-area Micro-channel Plate Photodetectors  

E-Print Network (OSTI)

: Imaging, gain mapping, and timing · Integrated electronics: DAQ system and fast waveform recording LAPPD = `tile' ­ Gain > 107 with two MCP plates ­ RF Transmission line anode ­ Internal HV distribution Large;10 May 2013 15 The 8" glass package LAPPD Collaboration MCPs Grid spacers Anode microstrips Top Window

379

Solving large stochastic planning problems using multiple dynamic abstractions  

E-Print Network (OSTI)

One of the goals of AI is to produce a computer system that can plan and act intelligently in the real world. It is difficult to do so, in part because real-world domains are very large. Existing research generally deals ...

Steinkraus, Kurt Alan, 1978-

2005-01-01T23:59:59.000Z

380

Interactive large data exploration over the wide area  

Science Conference Proceedings (OSTI)

The top supercomputers typically have aggregate memories in excess of 100 TB, with simulations running on these systems producing datasets of comparable size. The size of these datasets and the speed with which they are produced define the minimum performance ... Keywords: large data, remote data exploration, visualization

Mark Hereld; Michael E. Papka; Joseph A. Insley; Michael L. Norman; Eric C. Olson; Rick Wagner

2011-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Absolute Calibration of a Large-diameter Light Source  

E-Print Network (OSTI)

A method of absolute calibration for large aperture optical systems is presented, using the example of the Pierre Auger Observatory fluorescence detectors. A 2.5 m diameter light source illuminated by an ultra--violet light emitting diode is calibrated with an overall uncertainty of 2.1 % at a wavelength of 365 nm.

Brack, J T; Dorofeev, A; Gookin, B; Harton, J L; Petrov, Y; Rovero, A C

2013-01-01T23:59:59.000Z

382

Novel Lamination Method for Large Armor Panels  

Science Conference Proceedings (OSTI)

New Saccharification Process of Cellulosic Biomass by Microwave Irradiation · Novel Lamination Method for Large Armor Panels · Raman Spectroscopy for ...

383

Energy Basics: Large-Scale Hydropower  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Energy Basics Renewable Energy Printable Version Share this resource Biomass Geothermal Hydrogen Hydropower Large-Scale Hydropower Microhydropower Hydropower Resources...

384

InteMon: continuous mining of sensor data in large-scale self-infrastructures  

Science Conference Proceedings (OSTI)

Modern data centers have a large number of components that must be monitored, including servers, switches/routers, and environmental control systems. This paper describes InteMon, a prototype monitoring and mining system for data centers. It uses the ...

Evan Hoke; Jimeng Sun; John D. Strunk; Gregory R. Ganger; Christos Faloutsos

2006-07-01T23:59:59.000Z

385

Virtual screening on large scale grids  

Science Conference Proceedings (OSTI)

Large scale grids for in silico drug discovery open opportunities of particular interest to neglected and emerging diseases. In 2005 and 2006, we have been able to deploy large scale virtual docking within the framework of the WISDOM initiative against ... Keywords: Avian influenza, Large scale grids, Malaria, Virtual screening

Nicolas Jacq; Vincent Breton; Hsin-Yen Chen; Li-Yung Ho; Martin Hofmann; Vinod Kasam; Hurng-Chun Lee; Yannick Legré; Simon C. Lin; Astrid Maaí; Emmanuel Medernach; Ivan Merelli; Luciano Milanesi; Giulio Rastelli; Matthieu Reichstadt; Jean Salzemann; Horst Schwichtenberg; Ying-Ta Wu; Marc Zimmermann

2007-05-01T23:59:59.000Z

386

NREL: Energy Systems Integration - NREL's Energy Systems Integration...  

NLE Websites -- All DOE Office Websites (Extended Search)

a variety of operating configurations including, grid connected stand-alone microgrids and hybrid power systems. The PSIL can accommodate large power system components...

387

Monitoring system-of-systems requirements in multi product lines  

Science Conference Proceedings (OSTI)

[Context and motivation] Large-scale software-intensive systems are often considered as systems of systems comprising several interrelated product lines from which system variants are derived to meet the overall requirements. [Question/problem] ...

Thomas Klambauer, Gerald Holl, Paul Grünbacher

2013-04-01T23:59:59.000Z

388

Evaluation of retrocommissioning persistence in large commercialbuildings  

SciTech Connect

Commercial Building Retrocommissioning activity has increased in recent years. This paper discusses LBNL's recently conducted study of 8 participants in the Sacramento Municipal Utility District Retrocommissioning program. We evaluated the persistence of energy savings and measure implementation, in an effort to identify and understand factors that can improve the longevity of retrocommissioning benefits. The LBNL analysis included a whole-building and measure status analysis, incorporating elements of previous work by Texas A&M University and Portland Energy Conservation Inc. Included in the energy analysis were whole building calculated energy savings and consideration of effects from the 2001 energy crisis. The measure persistence analysis examined each recommended measure and it's current operational status. Results showed a 59% implementation rate of recommended measures. Some process findings were: (1) Building engineers will tweak a measure that didn't work, instead of reverting to the pre-retrocommissioning settings; (2) A majority of the implementation costs were absorbed into regular operation and maintenance budgets; (3) The most frequently reported down side was the large time demands on the building engineering staff. However, all respondents thought it was worth the price; (4) All the sites said that retrocommissioning is beneficial to their operations, due to ongoing training and continuous improvement of system specifications; and (5) Approximately 65% of the peak retrocommissioning savings persisted beyond four years.

Bourassa, Norman J.; Piette, Mary Ann; Motegi, Naoya

2004-05-01T23:59:59.000Z

389

Evaluation of retrocommissioning persistence in large commercialbuildings  

SciTech Connect

Commercial Building Retrocommissioning activity has increased in recent years. This paper discusses LBNL's recently conducted study of 8 participants in the Sacramento Municipal Utility District Retrocommissioning program. We evaluated the persistence of energy savings and measure implementation, in an effort to identify and understand factors that can improve the longevity of retrocommissioning benefits. The LBNL analysis included a whole-building and measure status analysis, incorporating elements of previous work by Texas A&M University and Portland Energy Conservation Inc. Included in the energy analysis were whole building calculated energy savings and consideration of effects from the 2001 energy crisis. The measure persistence analysis examined each recommended measure and it's current operational status. Results showed a 59% implementation rate of recommended measures. Some process findings were: (1) Building engineers will tweak a measure that didn't work, instead of reverting to the pre-retrocommissioning settings; (2) A majority of the implementation costs were absorbed into regular operation and maintenance budgets; (3) The most frequently reported down side was the large time demands on the building engineering staff. However, all respondents thought it was worth the price; (4) All the sites said that retrocommissioning is beneficial to their operations, due to ongoing training and continuous improvement of system specifications; and (5) Approximately 65% of the peak retrocommissioning savings persisted beyond four years.

Bourassa, Norman J.; Piette, Mary Ann; Motegi, Naoya

2004-05-01T23:59:59.000Z

390

Solar powered desalination system  

E-Print Network (OSTI)

Fundamentals of Salt Water Desalination. New York: Elsevier,7. Lightbucket. Large scale desalination: is there enoughSystem for Seawater Desalination Plants. The Netherlands:

Mateo, Tiffany Alisa

2011-01-01T23:59:59.000Z

391

Reduction of fire hazards on large mining equipment  

SciTech Connect

Although standards and regulations are in place to prevent large mining equipment fires, recent analyses of mine accident data show that mining equipment fires still occur with alarming frequency and grave consequences, particularly at all surface mines and in underground metal/nonmetal mines. Recently technological advances in fire protection, combined with the statistical data on equipment fires, led NIOSH to reinvestigate this and to improve operator safety. NIOSH demonstrated that newly developed technologies, such as dual cab fire inerting systems and engine compartment fire barriers, can greatly enhance operator safety and lessen the damage of property during large mobile equipment fires. 10 refs., 5 figs.

Maria I. De Rosa

2008-09-15T23:59:59.000Z

392

Hanford as a site for large accelerators  

SciTech Connect

The Ramsey Panel recommended that two very large accelerators be constructed during the next few years to meet urgent U. S. needs in high energy physics. Two studies have been made. The Lawrence Radiation Laboratory at Berkeley has studied a 200 to 300 BeV accelerator, while the Brooknaven National Laboratory on Long Island has made an analysis of a still larger accelerator--600 to 800 BeV. This special report is in response to a request for information on the suitability of the Atomic Energy Commission' s Hanford Project as a site for a large accelerator. Using criteria recommended by Lawrence and Brookhaven, the Hanford site offers significant economic advantages both in original installed cost and in annual operating expense. These advantages are: (1) Land--Hanford has available more than 150 square miles of govermnentowned land that readily meets topographic, geologic, and seismic criteria; (2) Power--- Hanford has surplus electrical capacity already installed to meet the demands of the largest accelerator--- at the lowest rates in the U. S. This alone offers an annual savings of several million dollars over any other location; (3) Water--- the Columbia River offers the largest supply of pure, cold water in the U. S.; there are excellent surplus reactor water plants available; (4) Transportation---four major railroads have direct connections to the Hanford Project rail system; multi- 1000-ton barge service is also available; (5) manpower---a high level of scientific and technical personnel as well as construction and craft labor is already in residence; (6) Services---complete support-type services, such as industrial shops, bus transportation, radiation protection, and plant security, are immediately available; and (7) Community--the area has an exceptionally high educational level, equal to the outstanding areas of the U. S. At the present time, the Hanford location has some disadvantages according to the cited criteria. These are: (1) lack of proximity to a university; (2) lack of a major jet airport; and (3) relative isolation from a major metropolitan area. The first two are even now under vigorous study and action by both state and local bodies. The third, though often a disadvantage, appears to have considerable appeal to many. In total, the many tangible assets of the Hanford Project offer tremendous potential dollar savings to the Government. The shutdown of preduction reactors makes many millions of dollars worth of excellent support facilities and manpower readily available. The minor disadvantages can be met almost entirely by the state and community. (auth)

Leonard, B.R. Jr.

1965-01-01T23:59:59.000Z

393

and Large Sized Chinese Steel Enterprises  

NLE Websites -- All DOE Office Websites (Extended Search)

Analysis of the Past and Future Trends of Energy Use in Key Medium and Large Sized Chinese Steel Enterprises year month institution Lawrence Berkeley National Laboratory abstract p...

394

Large Neighborhood Search for LNG Inventory Routing  

E-Print Network (OSTI)

Feb 3, 2012 ... Large Neighborhood Search for LNG Inventory Routing. Vikas Goel (vikas.goel ** *at*** exxonmobil.com) Kevin Furman (kevin.c.furman ***at*** ...

395

Energy Characteristics and Energy Consumed in Large Hospital Buildings in  

Gasoline and Diesel Fuel Update (EIA)

Energy Characteristics and Energy Consumed in Large Hospital Buildings in Energy Characteristics and Energy Consumed in Large Hospital Buildings in the United States in 2007 Main Report | Methodology | FAQ | List of Tables CBECS 2007 - Release date: August 17, 2012 Hospitals consume large amounts of energy because of how they are run and the many people that use them. They are open 24 hours a day; thousands of employees, patients, and visitors occupy the buildings daily; and sophisticated heating, ventilation, and air conditioning (HVAC) systems control the temperatures and air flow. In addition, many energy intensive activities occur in these buildings: laundry, medical and lab equipment use, sterilization, computer and server use, food service, and refrigeration. The 2003 Commercial Building Energy Consumption Survey (CBECS) data showed

396

Building Energy Software Tools Directory: ID-Spec Large  

NLE Websites -- All DOE Office Websites (Extended Search)

ID-Spec Large ID-Spec Large ID-Spec Large is software for the electrical installation design of industrial and tertiary buildings. It helps to design a green electrical installation by enabling the user to: - Assess the impact of selecting energy efficiency solutions like power factor correction and low losses transformers in terms of cost savings - Reduce power losses and consequently carbon emissions in the electrical installation by optimizing equipment locations - Reduce investment cost while using less raw materials by optimizing length and cross-section of cables - Assess the percentage of recyclable materials for cables and busbar trunking systems. Screen Shots Keywords Electrical installation design, power losses assessment, CO2 emissions, quantity of conductors

397

Explosive performance measurements on large, multiple-hole arrays and large masses of conventional explosive  

SciTech Connect

The COntinuous Reflectometry for Radius vs. Time EXperiment (CORRTEX) system was developed by the Los Alamos National Laboratory for determining the energy released in a nuclear explosion by measuring the position of its shock front as a function of time. The CORRTEX system, fielding techniques, and the methods and software for data reduction and analysis were developed over a 15 year period with hundreds of measurements made on nuclear tests and high explosive experiments. CORRTEX is a compact, portable, fast-sampling, microprocessor-controlled system, based on time domain reflectometry, requiring only a 24 volt power source and a sensing element. Only the sensing element (a length of 50 ohm coaxial cable) is expended during the detonation. In 1979, the CORRTEX system was shown to be ideally suited for chemical explosive performance measurements. Its utility for diagnosing chemical explosives was further demonstrated with successful measurements on large multiple-hole chemical shots in rock quarries and strip mines. Accurate timing of the detonation of sequenced or ripple fired arrays, as well as data characterizing the initiation, explosive performance and detonation anomalies are obtained. This information can serve as the basis for empirical or modeled improvements to blasting operations. A summary of the special CORRTEX features and well developed analysis techniques together with the experiment designs, data, and conclusions regarding the measurements and explosive performance from several array detonations and the Chemical Kiloton Experiment, 2.9 million pounds of an ammonium nitrate-fuel oil (ANFO) and emulsion blend conducted on the Nevada Test Site in 1993, are presented.

McKown, T.O. [Los Alamos National Lab., NM (United States); Eilers, D.D. [Raytheon Services Nevada, Las Vegas, NV (United States); Williams, P.E. [New Mexico Tech., Socorro, New Mexico (United States). Energetic Materials Research and Testing Center

1994-11-01T23:59:59.000Z

398

Crowd-powered systems  

E-Print Network (OSTI)

Crowd-powered systems combine computation with human intelligence, drawn from large groups of people connecting and coordinating online. These hybrid systems enable applications and experiences that neither crowds nor ...

Bernstein, Michael Scott

2012-01-01T23:59:59.000Z

399

Conformal Blocks in the Large D Limit  

E-Print Network (OSTI)

We derive conformal blocks in an inverse spacetime dimension expansion. In this large D limit, the blocks are naturally written in terms of a new combination of conformal cross-ratios. We comment on the implications for the conformal bootstrap at large D.

A. Liam Fitzpatrick; Jared Kaplan; David Poland

2013-04-30T23:59:59.000Z

400

A Sequential Cooperative Game Theoretic Approach to Storage-Aware Scheduling of Multiple Large-Scale Workflow Applications in Grids  

Science Conference Proceedings (OSTI)

Scheduling large-scale applications in heterogeneous Grid and Cloud systems is a fundamental NP-complete problem for obtaining good performance and execution costs. We address the problem of scheduling an important class of large-scale Grid applications ...

Rubing Duan; Radu Prodan; Xiaorong Li

2012-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

The ground state of the Kondo model with large spin  

E-Print Network (OSTI)

In this paper, we prove that the ground state of the Kondo model with large spin is nondegenerate, apart from a SU(2) spin degeneracy in the case of half filling. The ground state spin is found for the system, and the energy level orderings are discussed. Finally, the existence of ferrimagnetism in some cases is proved. PACS numbers: 75.10.Lp 75.30.Mb, 75.50.Gg The Kondo models, or single and lattice impurity models, are one of the most challenging subjects in strongly correlated systems 1–3. Recent developments of reflection positivity technique in the spin space make it possible to establish some rigorous results for the half-filled strongly correlated electron systems 4–9. Theory of reflection positivity in the spin space for the single- and multi-channel Kondo models with spin 1/2 was developed recently and a series of rigorous results on the ground state properties were proved 8,9. However some materials are described by the Kondo models with large spin, such as (La1?xXx)MnO3 with X = Ba, Ca, Sr etc. and the localised spin s = 3/2 10. Due to more degrees of freedom in the case of large spin than in the case of spin 1/2, usually it is very hard to extract rigorous results for those systems. As a generalisation of the theory for the Kondo model with spin 1/2, we will investigate the Kondo model with large spin and provide some rigorous results on the ground state of the Kondo model in the case of half filling. Let us first write down the Hamiltonian we will investigate:

Shun-qing Shen; Jisi Sci; Kijsi Sj

1996-01-01T23:59:59.000Z

402

The Very Large Hadron Collider: The farthest energy frontier  

E-Print Network (OSTI)

THE VERY LARGE HADRON COLLIDER: THE FARTHEST ENERGY FRONTIERAbstract The Very Large Hadron Collider (or Eloisatron)

Barletta, William A.

2001-01-01T23:59:59.000Z

403

A New Technique for Troubleshooting Large Capacitive Energy Storage Banks  

DOE Green Energy (OSTI)

The Power Conditioning System (PCS) of the National Ignition Facility (NIF) like many pulse power systems relies on large numbers of inductively isolated high voltage capacitors configured in parallel for energy storage. When an energy storage capacitor fails in such a capacitor bank, there is often little or no external indication showing which capacitor failed. Identifying the failed component can be a time consuming and potentially hazardous operation. Conventional methods using capacitance meters require that each capacitor be disconnected and tested independently. They have developed a new non-invasive technique (i.e. no dismantling of the bank is required) that greatly improves personnel safety as well reducing troubleshooting time.

Fulkerson, S E; Hammon, J

2001-06-05T23:59:59.000Z

404

Large-Scale Hybrid Dynamic Simulation Employing Field Measurements  

Science Conference Proceedings (OSTI)

Simulation and measurements are two primary ways for power engineers to gain understanding of system behaviors and thus accomplish tasks in system planning and operation. Many well-developed simulation tools are available in today's market. On the other hand, large amount of measured data can be obtained from traditional SCADA systems and currently fast growing phasor networks. However, simulation and measurement are still two separate worlds. There is a need to combine the advantages of simulation and measurements. In view of this, this paper proposes the concept of hybrid dynamic simulation which opens up traditional simulation by providing entries for measurements. A method is presented to implement hybrid simulation with PSLF/PSDS. Test studies show the validity of the proposed hybrid simulation method. Applications of such hybrid simulation include system event playback, model validation, and software validation.

Huang, Zhenyu; Guttromson, Ross T.; Hauer, John F.

2004-06-30T23:59:59.000Z

405

Large contraction conducting polymer molecular actuators  

E-Print Network (OSTI)

The development of powerful and efficient artificial muscles that mimic Nature will profoundly affect engineering sciences including robotics and prosthetics, propulsion systems, and microelectromechanical systems (MEMS). ...

Anquetil, Patrick A. T. (Patrick Armand T.), 1973-

2005-01-01T23:59:59.000Z

406

Large Energy Users Program | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Large Energy Users Program Large Energy Users Program Large Energy Users Program < Back Eligibility Commercial Fed. Government Industrial Institutional Local Government Nonprofit Schools State Government Savings Category Heating & Cooling Commercial Heating & Cooling Heating Cooling Home Weatherization Construction Commercial Weatherization Design & Remodeling Manufacturing Other Appliances & Electronics Heat Pumps Commercial Lighting Lighting Water Heating Maximum Rebate Prescriptive: Varies by equipment type Custom: $200,000 or 30% per project Total Prescriptive and Custom combined: $400,000 per calendar year Program Info Funding Source Focus On Energy Start Date 04/01/2012 Expiration Date 12/31/2013 State Wisconsin Program Type State Rebate Program Rebate Amount Prescriptive: Varies by equipment type

407

Large Wind Technology | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Large Wind Technology Large Wind Technology Large Wind Technology The Wind Program works with industry partners to increase the performance and reliability of large wind technologies while lowering the cost of wind energy. The program's research efforts have helped to increase the average capacity factor (a measure of power plant productivity) from 22% for wind turbines installed before 1998 to 35% for turbines installed between 2004 and 2007. Wind energy costs have been reduced from over 55 cents (current dollars) per kilowatt-hour (kWh) in 1980 to under six cents/kWh today. To ensure future industry growth, the technology must continue to evolve, building on earlier successes to further improve reliability, increase capacity factors, and reduce costs. This page describes the goal of the

408

Carderock Large Cavitation Tunnel | Open Energy Information  

Open Energy Info (EERE)

Large Cavitation Tunnel Large Cavitation Tunnel Jump to: navigation, search Basic Specifications Facility Name Carderock Large Cavitation Tunnel Overseeing Organization United States Naval Surface Warfare Center Hydrodynamic Testing Facility Type Tunnel Length(m) 13.1 Beam(m) 3.0 Depth(m) 3.0 Water Type Freshwater Cost(per day) Contact POC Special Physical Features The Large Cavitation Channel was designed as a variable pressure, recirculating, cavitation tunnel with a very low acoustic background level; test section pressure: 3.5-414 kPa (0.03 to 4 atmospheres, 0.5 to 60 psia); air content: 10% to 100% saturation Towing Capabilities Towing Capabilities None Wavemaking Capabilities Wavemaking Capabilities None Channel/Tunnel/Flume Velocity(m/s) 18 Recirculating Yes Wind Capabilities

409

Nanophosphors for Large Area Radiation Detectors  

NLE Websites -- All DOE Office Websites (Extended Search)

Homeland Security & Defense » Homeland Security & Defense » Nanophosphors for Large Area Radiation Detectors Nanophosphors for Large Area Radiation Detectors The present invention includes a composition comprising nanophosphor particles capped with a ligand. June 25, 2013 Nanophosphors for Large Area Radiation Detectors The present invention includes a composition comprising nanophosphor particles capped with a ligand. Available for thumbnail of Feynman Center (505) 665-9090 Email Nanophosphors for Large Area Radiation Detectors The present invention includes a composition comprising nanophosphor particles capped with a ligand. The nanophosphor particles have are less than or equal to 20 nanometers. The composition has at least one lanthanide and at least one halide. The weight percent of lanthanide

410

Large-Eddy Boundary Layer Entrainment  

Science Conference Proceedings (OSTI)

A series of large-eddy simulations have been performed to explore boundary layer entrainment under conditions of a strongly capped inversion layer with the boundary layer dynamics driven dominantly by buoyant forcing. Different conditions ...

D. C. Lewellen; W. S. Lewellen

1998-08-01T23:59:59.000Z

411

Very Large Hailstones From Aurora, Nebraska  

Science Conference Proceedings (OSTI)

The Aurora, Nebraska, hailstorm of 22 June 2003 produced some exceptionally large hailstones, and was widely publicized. Nineteen hailstones obtained from local people have been sectioned and photographed and eight are illustrated here, recording ...

Charles A. Knight; Nancy C. Knight

2005-12-01T23:59:59.000Z

412

Fermilab Now - LHC Large Hadron Collider  

NLE Websites -- All DOE Office Websites (Extended Search)

Large Hadron Collider (LHC) Over the next few months, a 12,500-ton detector will be lowered almost 300 feet below ground near the French-Swiss border. Dubbed "CMS," this detector...

413

Program Management for Large Scale Engineering Programs  

E-Print Network (OSTI)

The goal of this whitepaper is to summarize the LAI research that applies to program management. The context of most of the research discussed in this whitepaper are large-scale engineering programs, particularly in the ...

Oehmen, Josef

414

Energy Basics: Large-Scale Hydropower  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

These plants are more than 30 MW in size, and there is more than 80,000 MW of installed generation capacity in the United States today. Most large-scale hydropower projects use a...

415

Decontamination of large components-test case  

SciTech Connect

The rising per-cubic-foot burial costs, together with the trend toward standardized above-ground burial sites, provides the basis for seeking an alternative to direct burial of large components. Large contaminated components such as steam generators can be safely dismantled and decontaminated for free release, metals recycle, and volume reduction. This grand-scale disposal technology will prove to be an economical and ecological alternative to direct burial or interim storage. Yankee Atomic Electric Company (YAEC) in Bolton, operators and decommissioners of the Yankee Nuclear Power Station in Rowe, Massachusetts, has teamed with Frank W Hake Associates in Memphis, TN, to decontaminate a large component as a test case. The large component is YAEC`s reactor pressure vessel head (RPVH). The 79 100 lb RPVH is surface contaminated with 0.7 Ci (1500 mR/h contact) resulting from 32 yr of operating in a 2000 psi, 530{degrees}F pressurized water reactor environment.

Mancini, A. [Yankee Atomic Electric Co., Bolton, MA (United States); Bosco, B. [Frank W. Hake Associates, Memphis, TN (United States)

1996-12-31T23:59:59.000Z

416

Early Cloud Formation by Large Area Fires  

Science Conference Proceedings (OSTI)

Fires simultaneously burning in hundreds of square kilometers could result from a nuclear weapon explosion. The strong buoyancy field of such large area fires induces high-velocity fire winds that turn upward in the burning region. This results ...

R. D. Small; K. E. Heikes

1988-05-01T23:59:59.000Z

417

Aircraft Icing Caused by Large Supercooled Droplets  

Science Conference Proceedings (OSTI)

The characteristic of aircraft icing environments containing large supercooled droplets are described. Substantial loss in rate of climb capability can result from less than 10 minutes duration in conditions where fewer than 0.1–1 cm?3 of ...

Marcia K. Politovich

1989-09-01T23:59:59.000Z

418

California Initiative for Large Molecule Sustainable Fuels  

E-Print Network (OSTI)

California Initiative for Large Molecule Sustainable Fuels Transportation Energy Research PIER these fuels stands in the way of California's energy independence. Liquid fuels produced from biomass have California's preeminence in this field of technology, creating green jobs through these technologies

419

Occlusion Culling in Large Virtual Environments  

Science Conference Proceedings (OSTI)

In this paper, occlusion testing in very large virtual environments is discussed from two perspectives: a theoretical one, discussing occlusion culling in relation to detail elision (level of detail), and a practical one, relating to an adaptive occlusion-culling ...

Karsten Bormann

2001-10-01T23:59:59.000Z

420

Large-Scale Hydrogen Combustion Experiments  

Science Conference Proceedings (OSTI)

Large-scale combustion experiments show that deliberate ignition can limit hydrogen accumulation in reactor containments. The collected data allow accurate evaluation of containment pressures and temperatures associated with hydrogen combustion.

1988-10-18T23:59:59.000Z

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Large-Scale Offshore Wind Power  

NLE Websites -- All DOE Office Websites (Extended Search)

Large-Scale Offshore Wind Power in the United States EXECUTIVE SUMMARY September 2010 NOTICE This report was prepared as an account of work sponsored by an agency of the United...

422

Large-Scale Dynamics and Global Warming  

Science Conference Proceedings (OSTI)

Predictions of future climate change raise a variety of issues in large-scale atmospheric and oceanic dynamics. Several of these are reviewed in this essay, including the sensitivity of the circulation of the Atlantic Ocean to increasing ...

Isaac M. Held

1993-02-01T23:59:59.000Z

423

Large-Eddy Simulation of Contrails  

Science Conference Proceedings (OSTI)

Numerical simulations of contrails have been performed to investigate the role of various external parameters and physical processes in the life cycle of contrails. The general idea underlying the model is that of a large-eddy model. The model ...

Andreas Chlond

1998-03-01T23:59:59.000Z

424

Large-Scale Data Challenges in Future Power Grids  

Science Conference Proceedings (OSTI)

This paper describes technical challenges in supporting large-scale real-time data analysis for future power grid systems and discusses various design options to address these challenges. Even though the existing U.S. power grid has served the nation remarkably well over the last 120 years, big changes are in the horizon. The widespread deployment of renewable generation, smart grid controls, energy storage, plug-in hybrids, and new conducting materials will require fundamental changes in the operational concepts and principal components. The whole system becomes highly dynamic and needs constant adjustments based on real time data. Even though millions of sensors such as phase measurement units (PMUs) and smart meters are being widely deployed, a data layer that can support this amount of data in real time is needed. Unlike the data fabric in cloud services, the data layer for smart grids must address some unique challenges. This layer must be scalable to support millions of sensors and a large number of diverse applications and still provide real time guarantees. Moreover, the system needs to be highly reliable and highly secure because the power grid is a critical piece of infrastructure. No existing systems can satisfy all the requirements at the same time. We examine various design options. In particular, we explore the special characteristics of power grid data to meet both scalability and quality of service requirements. Our initial prototype can improve performance by orders of magnitude over existing general-purpose systems. The prototype was demonstrated with several use cases from PNNL’s FPGI and was shown to be able to integrate huge amount of data from a large number of sensors and a diverse set of applications.

Yin, Jian; Sharma, Poorva; Gorton, Ian; Akyol, Bora A.

2013-03-25T23:59:59.000Z

425

Trojan PWR Decommissioning: Large Component Removal Project  

Science Conference Proceedings (OSTI)

While the decommissioning of large commercial nuclear plants in the United States is in its infancy, the technical challenges with associated radioactive waste management are clear. This report describes the removal and disposal of four steam generators and one pressurizer from the Trojan nuclear power plant, the first large PWR to be decommissioned in the United States. The report chronicles the problems, successes, and lessons learned in this project, which was completed on schedule and under budget in...

1997-09-29T23:59:59.000Z

426

3D Technologies for Large Area Trackers  

E-Print Network (OSTI)

We describe technologies which can be developed to produce large area, low cost pixelated tracking detec- tors. These utilize wafer-scale 3D electronics and sensor technologies currently being developed in industry. This can result in fully active sensor/readout chip tiles which can be assembled into large area arrays with good yield and minimal dead area. The ability to connect though the bulk of the device can also provide better electrical performance and lower mass.

Deptuch, G; Johnson, M; Kenney, C; Lipton, R; Narian, M; Parker, S; Shenai, A; Spiegel, L; Thom, J; Ye, Z

2013-01-01T23:59:59.000Z

427

3D Technologies for Large Area Trackers  

E-Print Network (OSTI)

We describe technologies which can be developed to produce large area, low cost pixelated tracking detec- tors. These utilize wafer-scale 3D electronics and sensor technologies currently being developed in industry. This can result in fully active sensor/readout chip tiles which can be assembled into large area arrays with good yield and minimal dead area. The ability to connect though the bulk of the device can also provide better electrical performance and lower mass.

G. Deptuch; U. Heintz; M. Johnson; C. Kenney; R. Lipton; M. Narian; S. Parker; A. Shenai; L. Spiegel; J. Thom; Z. Ye

2013-07-16T23:59:59.000Z

428

Algorithms for Large-Scale Internet Measurements  

E-Print Network (OSTI)

As the Internet has grown in size and importance to society, it has become increasingly difficult to generate global metrics of interest that can be used to verify proposed algorithms or monitor performance. This dissertation tackles the problem by proposing several novel algorithms designed to perform Internet-wide measurements using existing or inexpensive resources. We initially address distance estimation in the Internet, which is used by many distributed applications. We propose a new end-to-end measurement framework called Turbo King (T-King) that uses the existing DNS infrastructure and, when compared to its predecessor King, obtains delay samples without bias in the presence of distant authoritative servers and forwarders, consumes half the bandwidth, and reduces the impact on caches at remote servers by several orders of magnitude. Motivated by recent interest in the literature and our need to find remote DNS nameservers, we next address Internet-wide service discovery by developing IRLscanner, whose main design objectives have been to maximize politeness at remote networks, allow scanning rates that achieve coverage of the Internet in minutes/hours (rather than weeks/months), and significantly reduce administrator complaints. Using IRLscanner and 24-hour scan durations, we perform 20 Internet-wide experiments using 6 different protocols (i.e., DNS, HTTP, SMTP, EPMAP, ICMP and UDP ECHO). We analyze the feedback generated and suggest novel approaches for reducing the amount of blowback during similar studies, which should enable researchers to collect valuable experimental data in the future with significantly fewer hurdles. We finally turn our attention to Intrusion Detection Systems (IDS), which are often tasked with detecting scans and preventing them; however, it is currently unknown how likely an IDS is to detect a given Internet-wide scan pattern and whether there exist sufficiently fast stealth techniques that can remain virtually undetectable at large-scale. To address these questions, we propose a novel model for the windowexpiration rules of popular IDS tools (i.e., Snort and Bro), derive the probability that existing scan patterns (i.e., uniform and sequential) are detected by each of these tools, and prove the existence of stealth-optimal patterns.

Leonard, Derek Anthony

2010-12-01T23:59:59.000Z

429

Disaster recovery codes: increasing reliability with large-stripe erasure correcting codes  

Science Conference Proceedings (OSTI)

Large-scale storage systems need to provide the right amount of redundancy in their storage scheme to protect client data. In particular, many high-performance systems require data protection that imposes minimal impact on performance; thus, such systems ... Keywords: erasure coding, storage reliability

Kevin M. Greenan; Ethan L. Miller; Thomas J. E. Schwarz; Darrell D.E. Long

2007-10-01T23:59:59.000Z

430

96 ASHRAE Transactions: Research Current duct design methods for variable air volume  

E-Print Network (OSTI)

96 ASHRAE Transactions: Research ABSTRACT Current duct design methods for variable air volume (VAV in the 1997 ASHRAE Handbook--Fundamentals (ASHRAE 1997): equal friction, static regain, and the T Systems Taecheol Kim Jeffrey D. Spitler, Ph.D., P.E. Ronald D. Delahoussaye, Ph.D. Member ASHRAE Taecheol

431

Economic Comparison of HVAC and HVDCSolutions for Large Offshore Wind Farms underSpecial Consideration of Reliability.  

E-Print Network (OSTI)

?? An economic comparison of several HVAC-HVDC transmission systems from large offshore windfarms is presented. The power output from the offshore windfarm is modeled by… (more)

Lazaridis, Lazaros

2005-01-01T23:59:59.000Z

432

Finding Large Aperture Fractures in Geothermal Resource Areas Using a  

Open Energy Info (EERE)

Finding Large Aperture Fractures in Geothermal Resource Areas Using a Finding Large Aperture Fractures in Geothermal Resource Areas Using a Three-Component Long-Offset Surface Seismic Survey Geothermal Project Jump to: navigation, search Last modified on July 22, 2011. Project Title Finding Large Aperture Fractures in Geothermal Resource Areas Using a Three-Component Long-Offset Surface Seismic Survey Project Type / Topic 1 Recovery Act: Geothermal Technologies Program Project Type / Topic 2 Validation of Innovative Exploration Technologies Project Description Because fractures and faults with sub-commercial permeability can propagate hot fluid and hydrothermal alteration throughout a geothermal reservoir, potential field geophysical methods including resistivity, gravity, heatflow and magnetics cannot distinguish between low-permeability fractures and LAF's (Large Aperature Fractures). USG will develop and test the combination of three-component,long-offset seismic surveying, permanent scatter synthetic aperture radar interferometry (PSInSAR) and structural kinematic analysis as an integrated method for locating and 3-D mapping of LAF's in shallow to intermediate depth (600-4000 feet) geothermal systems. This project is designed to test the methodology on known occurrences of LAF's and then apply the technology to expand an existing production field and find a new production field in a separate but related resource area. A full diameter production well will be drilled into each of the two lease blocks covered by the geophysical exploration program.

433

Plasma deposited diamond-like carbon films for large neutralarrays  

SciTech Connect

To understand how large systems of neurons communicate, we need to develop methods for growing patterned networks of large numbers of neurons. We have found that diamond-like carbon thin films formed by energetic deposition from a filtered vacuum arc carbon plasma can serve as ''neuron friendly'' substrates for the growth of large neural arrays. Lithographic masks can be used to form patterns of diamond-like carbon, and regions of selective neuronal attachment can form patterned neural arrays. In the work described here, we used glass microscope slides as substrates on which diamond-like carbon was deposited. PC-12 rat neurons were then cultured on the treated substrates and cell growth monitored. Neuron growth showed excellent contrast, with prolific growth on the treated surfaces and very low growth on the untreated surfaces. Here we describe the vacuum arc plasma deposition technique employed, and summarize results demonstrating that the approach can be used to form large patterns of neurons.

Brown, I.G.; Blakely, E.A.; Bjornstad, K.A.; Galvin, J.E.; Monteiro, O.R.; Sangyuenyongpipat, S.

2004-07-15T23:59:59.000Z

434

Challenges in optics for Extremely Large Telescope instrumentation  

E-Print Network (OSTI)

We describe and summarize the optical challenges for future instrumentation for Extremely Large Telescopes (ELTs). Knowing the complex instrumental requirements is crucial for the successful design of 30-60m aperture telescopes. After all, the success of ELTs will heavily rely on its instrumentation and this, in turn, will depend on the ability to produce large and ultra-precise optical components like light-weight mirrors, aspheric lenses, segmented filters, and large gratings. New materials and manufacturing processes are currently under study, both at research institutes and in industry. In the present paper, we report on its progress with particular emphasize on volume-phase-holographic gratings, photochromic materials, sintered silicon-carbide mirrors, ion-beam figuring, ultra-precision surfaces, and free-form optics. All are promising technologies opening new degrees of freedom to optical designers. New optronic-mechanical systems will enable efficient use of the very large focal planes. We also provide exploratory descriptions of "old" and "new" optical technologies together with suggestions to instrument designers to overcome some of the challenges placed by ELT instrumentation.

P. Spanò; F. M. Zerbi; C. J. Norrie; C. R. Cunningham; K. G. Strassmeier; A. Bianco; P. A. Blanche; M. Bougoin; M. Ghigo; P. Hartmann; L. Zago; E. Atad-Ettedgui; B. Delabre; H. Dekker; M. Melozzi; B. Snyders; R. Takke; D. D. Walker

2006-03-28T23:59:59.000Z

435

Verification of Adaptive Systems  

SciTech Connect

Adaptive systems are critical for future space and other unmanned and intelligent systems. Verification of these systems is also critical for their use in systems with potential harm to human life or with large financial investments. Due to their nondeterministic nature and extremely large state space, current methods for verification of software systems are not adequate to provide a high level of assurance for them. The combination of stabilization science, high performance computing simulations, compositional verification and traditional verification techniques, plus operational monitors, provides a complete approach to verification and deployment of adaptive systems that has not been used before. This paper gives an overview of this approach.

Pullum, Laura L [ORNL; Cui, Xiaohui [New York Institute of Technology (NYIT); Vassev, Emil [Lero – The Irish Software Engineering Research Centre; Hinchey, Mike [Lero – The Irish Software Engineering Research Centre; Rouff, Christopher [Lockheed Martin Corporation; Buskens, Richard [Lockheed Martin Corporation

2012-01-01T23:59:59.000Z

436

Large hadron collider (LHC) project quality assurance plan  

E-Print Network (OSTI)

PUB-5478-Rev.B Large Hadron Collider (LHC) Project Qualityobjectives of the Large Hadron Collider (LHC) Project in aparticipation in the Large Hadron Collider Project. The LHC/

Gullo, Lisa; Karpenko, Victor; Robinson, Kem; Turner, William; Wong, Otis

2002-01-01T23:59:59.000Z

437

Table 8: Water Consumption Information for Large Hospitals  

U.S. Energy Information Administration (EIA)

Water Consumption Information for Large Hospitals, 2007 Table H8. RSEs for Water Consumption Information for Large Hospitals, 2007 Number of Large Hospital Buildings

438

Lightweight computational steering of very large scale molecular dynamics simulations  

Science Conference Proceedings (OSTI)

We present a computational steering approach for controlling, analyzing, and visualizing very large scale molecular dynamics simulations involving tens to hundreds of millions of atoms. Our approach relies on extensible scripting languages and an easy to use tool for building extensions and modules. The system is extremely easy to modify, works with existing C code, is memory efficient, and can be used from inexpensive workstations and networks. We demonstrate how we have used this system to manipulate data from production MD simulations involving as many as 104 million atoms running on the CM-5 and Cray T3D. We also show how this approach can be used to build systems that integrate common scripting languages (including Tcl/Tk, Perl, and Python), simulation code, user extensions, and commercial data analysis packages.

Beazley, D.M. [Univ. of Utah, Salt Lake City, UT (United States). Dept. of Computer Science; Lomdahl, P.S. [Los Alamos National Lab., NM (United States)

1996-09-01T23:59:59.000Z

439

A time management optimization framework for large-scale distributed hardware-in-the-loop simulation  

Science Conference Proceedings (OSTI)

Large-scale distributed HIL(Hardware-In-The-Loop) simulation is an important and indispensable method for testing and verifying complex engineering systems. An important necessary condition for realizing HIL simulation is that the speedup ratio of full-speed ... Keywords: hardware-in-the-loop simulation, large-scale distributed simulation, optimization framework, speedup ratio of simulation, time management

Wei Dong

2013-05-01T23:59:59.000Z

440

Carbon nanofiber supercapacitors with large areal capacitances James R. McDonough,1  

E-Print Network (OSTI)

Carbon nanofiber supercapacitors with large areal capacitances James R. McDonough,1 Jang Wook Choi December 2009 We develop supercapacitor SC devices with large per-area capacitances by utilizing three.1063/1.3273864 Supercapacitors SCs are useful in various applications such as in hybrid energy systems in vehicles, digital

Cui, Yi

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

DRAM errors in the wild: a large-scale field study  

Science Conference Proceedings (OSTI)

Errors in dynamic random access memory (DRAM) are a common form of hardware failure in modern compute clusters. Failures are costly both in terms of hardware replacement costs and service disruption. While a large body of work exists on DRAM in laboratory ... Keywords: data corruption, dimm, dram, dram reliability, ecc, empirical study, hard error, large-scale systems, memory, soft error

Bianca Schroeder; Eduardo Pinheiro; Wolf-Dietrich Weber

2009-06-01T23:59:59.000Z

442

Path recovery of a disappearing target in a large network of cameras  

Science Conference Proceedings (OSTI)

A large network of cameras is necessary for covering large areas in surveillance applications. In such systems, gaps between the fields of view of different cameras are often unavoidable. We present a method for path recovery of a single target in such ...

Amir Lev-Tov; Yael Moses

2010-08-01T23:59:59.000Z

443

Apolo: making sense of large network data by combining rich user interaction and machine learning  

Science Conference Proceedings (OSTI)

Extracting useful knowledge from large network datasets has become a fundamental challenge in many domains, from scientific literature to social networks and the web. We introduce Apolo, a system that uses a mixed-initiative approach - combining visualization, ... Keywords: belief propagation, large network, sensemaking

Duen Horng Chau; Aniket Kittur; Jason I. Hong; Christos Faloutsos

2011-05-01T23:59:59.000Z

444

Comparing Large-Scale Hydrological Model Simulations to Observed Runoff Percentiles in Europe  

Science Conference Proceedings (OSTI)

Large-scale hydrological models describing the terrestrial water balance at continental and global scales are increasingly being used in earth system modeling and climate impact assessments. However, because of incomplete process understanding and ...

Lukas Gudmundsson; Lena M. Tallaksen; Kerstin Stahl; Douglas B. Clark; Egon Dumont; Stefan Hagemann; Nathalie Bertrand; Dieter Gerten; Jens Heinke; Naota Hanasaki; Frank Voss; Sujan Koirala

2012-04-01T23:59:59.000Z

445

The Nonlinear Response of the Atmosphere to Large-Scale Mechanical and Thermal Forcing  

Science Conference Proceedings (OSTI)

The subject of large-scale mountain waves is reviewed briefly. Existing mountain wave theory based on a linear system is shown to give an inadequate description of the balance of angular momentum. The response of the atmosphere to mechanical ...

Guo-Xiong Wu

1984-08-01T23:59:59.000Z

446

Real &me numerical forecast of global epidemic spreading using large-scale computa&onal models  

E-Print Network (OSTI)

Real &me numerical forecast of global epidemic spreading using large conditions). Forecast = best prediction given the present knowledge on the system. Projection = attempt functionalities) #12;Real time forecast for the H1N1pdm (2009) Key parameters

Cattuto, Ciro

447

Category:LargeHotel | Open Energy Information  

Open Energy Info (EERE)

LargeHotel LargeHotel Jump to: navigation, search Go Back to PV Economics By Building Type Media in category "LargeHotel" The following 77 files are in this category, out of 77 total. SVLargeHotel Bismarck ND Montana-Dakota Utilities Co (North Dakota).png SVLargeHotel Bismarck ... 70 KB SVLargeHotel International Falls MN Northern States Power Co (Minnesota) Excel Energy.png SVLargeHotel Internati... 85 KB SVLargeHotel LA CA City of Los Angeles California (Utility Company).png SVLargeHotel LA CA Cit... 88 KB SVLargeHotel Memphis TN City of Memphis Tennessee (Utility Company).png SVLargeHotel Memphis T... 67 KB SVLargeHotel Minneapolis MN Northern States Power Co (Minnesota) Excel Energy.png SVLargeHotel Minneapol... 85 KB SVLargeHotel Minot ND Montana-Dakota Utilities Co (North Dakota).png

448

Brookhaven and the Large Hadron Collider  

NLE Websites -- All DOE Office Websites (Extended Search)

Brookhaven & the Large Hadron Collider Brookhaven & the Large Hadron Collider Home News Brookhaven & ATLAS ATLAS ATLAS Calorimeter ATLAS Muon Spectrometer Construction Computing Upgrades RHIC & LHC Education LHC tunnel ATLAS detector ATLAS detector RACF BNL built superconducting magnets Brookhaven & the LHC The world's most powerful particle accelerator, the Large Hadron Collider (LHC) in Switzerland, powers unprecedented explorations of the deepest mysteries of the universe. In addition to serving as the U.S. host laboratory for the ATLAS experiment at the LHC, Brookhaven National Lab plays multiple roles in this international collaboration, from construction and project management to data storage and distribution. ATLAS rendering Brookhaven and ATLAS Brookhaven physicists and engineers are participating in one of the most

449

BNL | Large Synoptic Survey Telescope (LSST)  

NLE Websites -- All DOE Office Websites (Extended Search)

Large Synoptic Survey Telescope Large Synoptic Survey Telescope About LSST Digital Sensor Array Brookhaven & Physics of the Universe LSST Project Website LSST: Providing an Unprecedented View of the Cosmos rendering of the LSST site in Chile A revolutionary 3.2 gigapixel camera mounted in a massive ground-based telescope will produce unprecedented views of the cosmos, driving discoveries with the widest, densest, and most complete images of our universe ever captured. New Visions The Large Synoptic Survey Telescope (LSST) will peer into space as no other telescope can. This new facility will create an unparalleled wide-field astronomical survey of our universe - wider and deeper in volume than all previous telescopes combined. The combination of a 3200 megapixel camera sensor array, a powerful supercomputer, a cutting-edge data processing and

450

Penn Large Water Tunnel | Open Energy Information  

Open Energy Info (EERE)

Penn Large Water Tunnel Penn Large Water Tunnel Jump to: navigation, search Basic Specifications Facility Name Penn Large Water Tunnel Overseeing Organization Pennsylvania State University Hydrodynamics Hydrodynamic Testing Facility Type Tunnel Length(m) 4.3 Beam(m) 1.2 Depth(m) 1.2 Water Type Freshwater Cost(per day) Contact POC Special Physical Features Closed loop; Turbulence level = 0.1%; Pressure range = 3-60psi; Controlled cavitation = # >0.1; Control Air content = >1ppm per mole Towing Capabilities Towing Capabilities None Wavemaking Capabilities Wavemaking Capabilities None Channel/Tunnel/Flume Channel/Tunnel/Flume Yes Velocity(m/s) 16.8 Recirculating Yes Pressure Range(Psi) 3 - 60 Wind Capabilities Wind Capabilities None Control and Data Acquisition Description National Instruments steady 24 bit

451

Stimulated Raman scattering in large plasmas  

Science Conference Proceedings (OSTI)

Stimulated Raman scattering is of concern to laser fusion since it can create a hot electron environment which can increase the difficulty of achieving high final fuel densities. In earlier experiments with one micron laser light, the energy measured in Raman-scattered light has been insignificant. But these experiments were done with, at most, about 100 joules of laser energy. The Raman instability has a high threshold which also requires a large plasma to be irradiated with a large diameter spot. Only with a long interaction length can the Raman-scattered light wave convectively grow to a large amplitude, and only in recent long pulse, high energy experiments (4000 joules in 2 ns) at the Shiva laser facility have we observed as much as several percent of the laser light to be Raman-scattered. We find that the Raman instability has a much lower intensity threshold for longer laser pulselength and larger laser spot size on a solid target.

Phillion, D.W.; Banner, D.L.

1980-11-06T23:59:59.000Z

452

Category:LargeOffice | Open Energy Information  

Open Energy Info (EERE)

LargeOffice LargeOffice Jump to: navigation, search Go Back to PV Economics By Building Type Media in category "LargeOffice" The following 77 files are in this category, out of 77 total. SVLargeOffice Bismarck ND Montana-Dakota Utilities Co (North Dakota).png SVLargeOffice Bismarck... 69 KB SVLargeOffice Cedar City UT Moon Lake Electric Assn Inc (Utah).png SVLargeOffice Cedar Ci... 57 KB SVLargeOffice International Falls MN Northern States Power Co (Minnesota) Excel Energy.png SVLargeOffice Internat... 83 KB SVLargeOffice LA CA City of Los Angeles California (Utility Company).png SVLargeOffice LA CA Ci... 92 KB SVLargeOffice Memphis TN City of Memphis Tennessee (Utility Company).png SVLargeOffice Memphis ... 70 KB SVLargeOffice Minneapolis MN Northern States Power Co (Minnesota) Excel Energy.png

453

NERSC File Systems  

NLE Websites -- All DOE Office Websites (Extended Search)

Systems Systems NERSC File Systems Overview NERSC file systems can be divided into two categories: local and global. Local file systems are only accessible on a single platform, providing best performance; global file systems are accessible on multiple platforms, simplifying data sharing between platforms. File systems are configured for different purposes. On each machine you have access to at least three different file system Home: Permanent, relatively small storage for data like source code, shell scripts, etc. that you want to keep. This file system is not tuned for high performance from parallel jobs. Referenced by the environment variable $HOME. Scratch: Large, high-performance file system. Place your large data files in this file system for capacity and capability computing. Data is

454

System Testing using UML Models  

Science Conference Proceedings (OSTI)

Coverage of system states during system testing is a nontrivial problem. It is because the number of system states is usually very large, and system developers often do not construct system state model. In this paper, we propose a method to design system ...

Monalisa Sarma; Rajib Mall

2007-10-01T23:59:59.000Z

455

Process Energy Audit for Large Industries  

E-Print Network (OSTI)

This paper discusses the author's approach to energy audits of large industries. Five large industrial segments, with energy intensive processes have been selected as examples. Items include: 1) the general methodology of conducting comprehensive industrial energy audit, 2) how one can identify energy efficiency opportunities, and 3) illustrate a few case study examples of energy conservation measures implemented in some of the industries, and 4) the importance of quality assurance/quality control in an energy audit. I will restrict this discussion to only electrical energy audit.

Chari, S.

1993-03-01T23:59:59.000Z

456

2007 CBECS Large Hospital Building List of Tables  

Annual Energy Outlook 2012 (EIA)

End Uses in Large Hospitals Table H3: End Use Equipment in Large Hospitals Table H4: Lighting and Window Features in Large Hospitals Table H5: Major Fuels Usage for Large...

457

Large Scale GSHP as Alternative Energy for American Farmers Geothermal  

Open Energy Info (EERE)

GSHP as Alternative Energy for American Farmers Geothermal GSHP as Alternative Energy for American Farmers Geothermal Project Jump to: navigation, search Last modified on July 22, 2011. Project Title Large Scale GSHP as Alternative Energy for American Farmers Project Type / Topic 1 Recovery Act - Geothermal Technologies Program: Ground Source Heat Pumps Project Type / Topic 2 Topic Area 1: Technology Demonstration Projects Project Description We propose a large scale demonstration of solar assisted GSHP systems on two poultry farms in mid-Missouri. The heating load of Farm A with 4 barns will be 510 tons and Farm B with 5 barns will be 440 tons. Solar assisted GSHP systems will be installed, and new utility business model will be applied to both farms. Farm A will be constructed with commercial products in order to bring immediate impact to the industry. Farm B will also have a thermal energy storage system installed, and improved solar collectors will be used. A comprehensive energy analysis and economic study will be conducted.

458

Intelligent Power Management Over Large Clusters  

Science Conference Proceedings (OSTI)

There is a growing tension within large organisations such as universities between the desire to perform vast amounts of computational processing and the desire to reduce power consumption by switching off computers. This situation will only worsen as ... Keywords: power management, condor, green computing

A. Stephen McGough; Clive Gerrard; Paul Haldane; Dave Sharples; Dan Swan; Paul Robinson; Sindre Hamlander; Stuart Wheater

2010-12-01T23:59:59.000Z

459

Gravitating Dyons with Large Electric Charge  

E-Print Network (OSTI)

We consider non-Abelian dyons in Einstein-Yang-Mills-Higgs theory. The dyons are spherically symmetric with unit magnetic charge. For large values of the electric charge the dyons approach limiting solutions, related to the Penney solutions of Einstein-Maxwell-scalar theory.

Rustam Ibadov; Burkhard Kleihaus; Jutta Kunz; Ulrike Neemann

2007-09-03T23:59:59.000Z

460

Distributed large-scale natural graph factorization  

Science Conference Proceedings (OSTI)

Natural graphs, such as social networks, email graphs, or instant messaging patterns, have become pervasive through the internet. These graphs are massive, often containing hundreds of millions of nodes and billions of edges. While some theoretical models ... Keywords: asynchronous algorithms, distributed optimization, graph algorithms, graph factorization, large-scale machine learning, matrix factorization

Amr Ahmed, Nino Shervashidze, Shravan Narayanamurthy, Vanja Josifovski, Alexander J. Smola

2013-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "vav system large" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Large Lenses of Highly Saline Mediterranean Water  

Science Conference Proceedings (OSTI)

Isolated compact anticyclonic eddies or salt lenses were found in the Canary Basin. Hydrographic surveys of three such lenses show large anomalies of salinity and temperature (0.8, 2.5°C). They are centered at 1100 m, have a vertical extent of ...

Laurence Armi; Walter Zenk

1984-10-01T23:59:59.000Z

462

Reuse and variability in large software applications  

Science Conference Proceedings (OSTI)

Reuse has always been a major goal in software engineering, since it promises large gains in productivity, quality and time to market reduction. Practical experience has shown that substantial reuse has only successfully happened in two cases: libraries, ... Keywords: AOP, COTS, EAI, MDA, interoperability, model driven software engineering, process driven application, product families, product line, reuse, variability, workflow

Jacky Estublier; German Vega

2005-09-01T23:59:59.000Z

463

Scaling Issues for Large-Scale Grids  

E-Print Network (OSTI)

· ESNet Can Play a Very Important Role in the Science Grid � Security Aspects of Grids · ESNet Can Provide will be important and very useful for managing large-scale virtual org. structures #12;·ESNet Can Play a Very Important Role in the Science Grid · ESNet can provide a rooted and managed namespace, and a place to home

464

Non-Markovian large amplitude motion and nuclear fission  

E-Print Network (OSTI)

The general problem of dissipation in macroscopic large-amplitude collective motion and its relation to energy diffusion of intrinsic degrees of freedom of a nucleus is studied. By applying the cranking approach to the nuclear many body system, a set of coupled dynamical equations for the collective classical variables and the quantum mechanical occupancies of the intrinsic nuclear states is derived. Different dynamical regimes of the intrinsic nuclear motion and its consequences on time properties of collective dissipation are discussed. The approach is applied to the descant of the nucleus from the fission barrier.

V. M. Kolomietz; S. V. Radionov

2008-12-08T23:59:59.000Z

465

Large-scale sodium spray fire code validation (SOFICOV) test  

Science Conference Proceedings (OSTI)

A large-scale, sodium, spray fire code validation test was performed in the HEDL 850-m/sup 3/ Containment System Test Facility (CSTF) as part of the Sodium Spray Fire Code Validation (SOFICOV) program. Six hundred fifty eight kilograms of sodium spray was sprayed in an air atmosphere for a period of 2400 s. The sodium spray droplet sizes and spray pattern distribution were estimated. The containment atmosphere temperature and pressure response, containment wall temperature response and sodium reaction rate with oxygen were measured. These results are compared to post-test predictions using SPRAY and NACOM computer codes.

Jeppson, D.W.; Muhlestein, L.D.

1985-01-01T23:59:59.000Z

466

Thermalization in collisions of large nuclei at high energies  

E-Print Network (OSTI)

Hydrodynamical analysis of experimental data of ultrarelativistic heavy ion collisions seems to indicate that the hot QCD matter created in the collisions thermalizes very quickly. Theoretically, we have no idea why this should be true. In this proceeding, I will describe how the thermalization takes place in the most theoretically clean limit -- that of large nuclei at asymptotically high energy per nucleon, where the system is described by weak-coupling QCD. In this limit, plasma instabilities dominate the dynamics from immediately after the collision until well after the plasma becomes nearly in equilibrium at time t \\alpha^(-5/2)Q^(-1).

Kurkela, Aleksi

2013-01-01T23:59:59.000Z

467

Large scale obscuration and related climate effects open literature bibliography  

SciTech Connect

Large scale obscuration and related climate effects of nuclear detonations first became a matter of concern in connection with the so-called ``Nuclear Winter Controversy`` in the early 1980`s. Since then, the world has changed. Nevertheless, concern remains about the atmospheric effects of nuclear detonations, but the source of concern has shifted. Now it focuses less on global, and more on regional effects and their resulting impacts on the performance of electro-optical and other defense-related systems. This bibliography reflects the modified interest.

Russell, N.A.; Geitgey, J.; Behl, Y.K.; Zak, B.D.

1994-05-01T23:59:59.000Z

468

Large 718 Forgings for Land Based Turbines  

Science Conference Proceedings (OSTI)

Since the development of the first gas turbine, the drive for lower cost electrical power has lead to more efficient land based power systems. Increased efficiency  ...

469

Induced-charge electrokinetics at large voltages  

E-Print Network (OSTI)

The classical transport theory cannot explain the experimental behavior of electrochemical systems in the extreme operating conditions required by modern microfluidics devices. Some experimental puzzles include strange ...

Kilic, Mustafa Sabri

2008-01-01T23:59:59.000Z

470

Cultural models, landscapes, and large dams.  

E-Print Network (OSTI)

??This work systematically explores the discourse of the human and environmental impact of the Santee Cooper hydroelectric system developed in the South Carolina coastal plain.… (more)

Lovern, Elizabeth Marie Harvey

2007-01-01T23:59:59.000Z

471

REAL TIME SYSTEM OPERATIONS 2006-2007  

E-Print Network (OSTI)

Advances in Power System  Control, Operation and Management Control And Operation of Large Electric Power  Systems – Power System Small Signal  Stability Analysis”, Fourth International Conference on Advances in Power System Control,  Operation 

Eto, Joseph H.

2008-01-01T23:59:59.000Z

472

Large-Scale Renewable Energy Guide  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Renewable Energy Guide Renewable Energy Guide Brad Gustafson, FEMP 2 Large-scale RE Guide Large-scale RE Guide: Developing Renewable Energy Projects Larger than 10 MWs at Federal Facilities Introduction and Overview Federal Utility Partnership Working Group May 22, 2013 Federal Energy Management Program Office of Energy Efficiency and Renewable Energy U.S. Department of Energy 3 Federal Energy Management Program FEMP works with key individuals to accomplish energy change within organizations by bringing expertise from all levels of project and policy implementation to enable Federal Agencies to meet energy related goals and to provide energy leadership to the country. 4 FEMP Renewable Energy * Works to increase the proportion of renewable energy in the Federal government's energy mix.

473

New England Wind Forum: Large Wind  

Wind Powering America (EERE)

Small Wind Small Wind Large Wind Newsletter Perspectives Events Quick Links to States CT MA ME NH RI VT Bookmark and Share Large Wind When establishing wind farms, wind energy developers generally approach landowners where they want to build. Interest in wind farms is frequently spurred by external pressures such as tax and other financial incentives and legislative mandates. Since each situation is influenced by local policies and permitting, we can only provide general guidance to help you learn about the process of installing wind turbines. Publications Wind Project Development Process Permitting of Wind Energy Facilities: A Handbook. (August 2002). National Wind Coordinating Collaborative. Landowner Frequently Asked Questions and Answers. (August 2003). "State Wind Working Group Handbook." pp. 130-133.

474

2007 CBECS Large Hospital Building FAQs  

Gasoline and Diesel Fuel Update (EIA)

FAQs Main Report | Methodology | FAQ | FAQs Main Report | Methodology | FAQ | List of Tables CBECS 2007 - Release date: August 17, 2012 How were the data collected for this study? These data were collected with the 2007 Commercial Building Energy Consumption Survey (CBECS). See the 2007 CBECS Large Hospital Building Methodology Report for details. Why are you publishing estimates only for large hospitals and not the rest of the commercial building population? A majority of the 2007 CBECS buildings were sampled from a frame that used a less expensive experimental method to update the 2003 frame for new construction. After careful analysis, EIA determined that the buildings sampled from this experimental frame were not representative of the commercial building population and therefore the 2007 CBECS sample as a

475

Big Science and the Large Hadron Collider  

E-Print Network (OSTI)

The Large Hadron Collider (LHC), the particle accelerator operating at CERN, is probably the most complex and ambitious scientific project ever accomplished by humanity. The sheer size of the enterprise, in terms of financial and human resources, naturally raises the question whether society should support such costly basic-research programs. I address this question here by first reviewing the process that led to the emergence of Big Science and the role of large projects in the development of science and technology. I then compare the methodologies of Small and Big Science, emphasizing their mutual linkage. Finally, after examining the cost of Big Science projects, I highlight several general aspects of their beneficial implications for society.

Gian Francesco Giudice

2011-06-13T23:59:59.000Z

476

Passive load control for large wind turbines.  

DOE Green Energy (OSTI)

Wind energy research activities at Sandia National Laboratories focus on developing large rotors that are lighter and more cost-effective than those designed with current technologies. Because gravity scales as the cube of the blade length, gravity loads become a constraining design factor for very large blades. Efforts to passively reduce turbulent loading has shown significant potential to reduce blade weight and capture more energy. Research in passive load reduction for wind turbines began at Sandia in the late 1990's and has moved from analytical studies to blade applications. This paper discusses the test results of two Sandia prototype research blades that incorporate load reduction techniques. The TX-100 is a 9-m long blade that induces bend-twist coupling with the use of off-axis carbon in the skin. The STAR blade is a 27-m long blade that induces bend-twist coupling by sweeping the blade in a geometric fashion.

Ashwill, Thomas D.

2010-05-01T23:59:59.000Z

477

Entanglement Entropy at Large Central Charge  

E-Print Network (OSTI)

Two-dimensional conformal field theories with a large central charge and a small number of low-dimension operators are studied using the conformal block expansion. A universal formula is derived for the Renyi entropies of N disjoint intervals in the ground state, valid to all orders in a series expansion. This is possible because the full perturbative answer in this regime comes from the exchange of the stress tensor and other descendants of the vacuum state. Therefore, the Renyi entropy is related to the Virasoro vacuum block at large central charge. The entanglement entropy, computed from the Renyi entropy by an analytic continuation, decouples into a sum of single-interval entanglements. This field theory result agrees with the Ryu-Takayanagi formula for the holographic entanglement entropy of a 2d CFT, applied to any number of intervals, and thus can be interpreted as a microscopic calculation of the area of minimal surfaces in 3d gravity.

Hartman, Thomas

2013-01-01T23:59:59.000Z

478

Entanglement Entropy at Large Central Charge  

E-Print Network (OSTI)

Two-dimensional conformal field theories with a large central charge and a small number of low-dimension operators are studied using the conformal block expansion. A universal formula is derived for the Renyi entropies of N disjoint intervals in the ground state, valid to all orders in a series expansion. This is possible because the full perturbative answer in this regime comes from the exchange of the stress tensor and other descendants of the vacuum state. Therefore, the Renyi entropy is related to the Virasoro vacuum block at large central charge. The entanglement entropy, computed from the Renyi entropy by an analytic continuation, decouples into a sum of single-interval entanglements. This field theory result agrees with the Ryu-Takayanagi formula for the holographic entanglement entropy of a 2d CFT, applied to any number of intervals, and thus can be interpreted as a microscopic calculation of the area of minimal surfaces in 3d gravity.

Thomas Hartman

2013-03-27T23:59:59.000Z

479

Siting technologies for large wind turbine clusters  

DOE Green Energy (OSTI)

Site selection for large wind turbine clusters requires thorough documentation of the wind characteristics at the site, because of the influence these characteristics will have on the economics, operations, and service life of the wind turbines. The wind prospecting strategy can be used by a utility to determine specific locations for each wind turbine in a cluster of 10 to 50 or more machines. The key to site selection is knowing what and where to measure. Siting techniques to be used at the various stages of the wind-prospecting strategy are discussed. These techniques help determine where to measure. What to measure at a site is still a moot question. Suggestions are made on what data are needed at what sampling rates. These are based on the assumption that until further experience in siting large clusters of wind turbines is in hand, thorough documentation of wind characteristics affecting machine and cluster output characteristics, operation strategies, and service life are necessary.

Hiester, T.R.; Pennell, W.T.

1979-11-01T23:59:59.000Z

480

Supporting large-scale science with workflows  

Science Conference Proceedings (OSTI)

Current workflow systems support data flow through complex analyses in a distributed environment. The scope of scientific workflow systems could expand to support the entire scientific research cycle, which includes data flow, design flow, and knowledge ... Keywords: needs assessment, scientific workflows

Deana D. Pennington

2007-06-01T23:59:59.000Z