National Library of Energy BETA

Sample records for hvac systems simulation

  1. Performance Validation and Energy Analysis of HVAC Systems using Simulation

    E-Print Network [OSTI]

    1 Performance Validation and Energy Analysis of HVAC Systems using Simulation Tim Salsbury and Rick This paper describes the concept of using simulation as a tool for performance validation and energy analysis and supervision of building systems in order to optimize operational performance. The paper describes one way

  2. MAPPING HVAC SYSTEMS FOR SIMULATION IN ENERGYPLUS

    E-Print Network [OSTI]

    Basarkar, Mangesh

    2013-01-01

    Semi-Automated Building Energy Performance Simulation, in:Simulation of Energy Performance, in: Building Simulation

  3. MAPPING HVAC SYSTEMS FOR SIMULATION IN ENERGYPLUS

    E-Print Network [OSTI]

    Basarkar, Mangesh

    2013-01-01

    of a user interface for the EnergyPlus whole building energyAutomated Simulation with EnergyPlus, in: CIB W078-W102:Antipolis, France. EnergyPlus, 2012. EnergyPlus Energy

  4. Co-simulation of innovative integrated HVAC systems in buildings

    E-Print Network [OSTI]

    Trcka, Marija

    2010-01-01

    Wetter, M. , 2009. Modelica-based Modeling and Simulation totools like TRNSYS or Modelica [http://www.modelica.org] have

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

    E-Print Network [OSTI]

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

    1996-01-01

    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...

  6. Renovating Residential HVAC Systems HVAC Systems

    E-Print Network [OSTI]

    Efficiency and Renewable Energy, Building Technologies, of the US Department of Energy (DOE) under contract Guideline for Residential HVAC Retrofits (http://www.eere.energy.gov/buildings/building, two of the houses were evaluated by an independent energy efficiency contractor. One of the test

  7. A Quasi-Dynamic HVAC and Building Simulation Methodology 

    E-Print Network [OSTI]

    Davis, Clinton Paul

    2012-07-16

    This thesis introduces a quasi-dynamic building simulation methodology which complements existing building simulators by allowing transient models of HVAC (heating, ventilating and air-conditioning) systems to be created in an analogous way...

  8. An implementation of co-simulation for performance prediction of innovative integrated HVAC systems in buildings

    E-Print Network [OSTI]

    Trcka, Marija

    2010-01-01

    Heating and Cooling Task 12B and IEA Energy Conservation inNeymark, J. and Judkoff, R. 2002. IEA HVAC BESTEST volume 1,Technical report of a IEA Solar Heating and Cooling

  9. Heat recovery and the economizer for HVAC systems

    SciTech Connect (OSTI)

    Anantapantula, V.S. . Alco Controls Div.); Sauer, H.J. Jr. )

    1994-11-01

    This articles examines why a combined heat reclaim/economizer system with priority to heat reclaim operation is most likely to result in the least annual total HVAC energy. PC-based, hour-by-hour simulation programs evaluate annual HVAC energy requirements when using combined operation of heat reclaim and economizer cycle, while giving priority to operation of either one. These simulation programs also enable the design engineer to select the most viable heat reclaim and/or economizer system for any given type of HVAC system serving the building internal load level, building geographical location and other building/system variables.

  10. Wireless Demand Response Controls for HVAC Systems

    E-Print Network [OSTI]

    Federspiel, Clifford

    2010-01-01

    conditioning. Figure 2: Wireless discharge air temperatureWireless Demand Response Controls for HVAC Systems Cliffordcontrol software and wireless hardware that could enable

  11. Energy Efficient HVAC System for Distributed Cooling/Heating...

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

    Efficient HVAC System for Distributed CoolingHeating with Thermoelectric Devices Energy Efficient HVAC System for Distributed CoolingHeating with Thermoelectric Devices 2012 DOE...

  12. Integration of HVAC System Design with Simplified Duct Distribution...

    Energy Savers [EERE]

    Integration of HVAC System Design with Simplified Duct Distribution - Building America Top Innovation Integration of HVAC System Design with Simplified Duct Distribution - Building...

  13. Development of a High-Efficiency Zonal Thermoelectric HVAC System...

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

    a High-Efficiency Zonal Thermoelectric HVAC System for Automotive Applications Development of a High-Efficiency Zonal Thermoelectric HVAC System for Automotive Applications...

  14. Improving efficiency of a vehicle HVAC system with comfort modeling...

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

    efficiency of a vehicle HVAC system with comfort modeling, zonal design, and thermoelectric devices Improving efficiency of a vehicle HVAC system with comfort modeling, zonal...

  15. Whole-Building Commercial HVAC System Simulation for Use in Energy Consumption Fault Detection 

    E-Print Network [OSTI]

    Painter, Frank

    2007-01-01

    Consumption The calibrated simulation of step 2 is then run using the appropriate weather input data and other measured input data that may be available (e.g., internal electrical gains, return temperatures, etc.). The output of this simulation is corrected..., temperature and pressure sensors, and VSD speeds. One of the major factors that lead to selection of this building for study was the extensive utility metering that is present. Electricity consumption, cooling consumption, and heating consumption are all...

  16. Application of Various HVAC Simulation Programs and Visual Tools to Commissioning 

    E-Print Network [OSTI]

    Zheng, M.; Pan, S.

    2007-01-01

    Various existing HVAC system simulation programs and visualization tools are considered to be potentially powerful tools for commissioning. Although not originally developed as commissioning tools, these programs facilitate the confirmation...

  17. A CONTROLLER FOR HVAC SYSTEMS WITH FAULT DETECTION CAPABILITIES BASED ON SIMULATION MODELS

    E-Print Network [OSTI]

    operating conditions change. Poor control performance can lead to occupant discomfort in a building, greater it is controlling. Faults that lead to performance deterioration or a change in system behavior are often masked. In addition, the model acts as a reference of correct behavior, which facilitates the detection of faults

  18. Theoretical Minimum Energy Use of a Building HVAC System 

    E-Print Network [OSTI]

    Tanskyi, O.

    2011-01-01

    This paper investigates the theoretical minimum energy use required by the HVAC system in a particular code compliant office building. This limit might be viewed as the "Carnot Efficiency" for HVAC system. It assumes that all ventilation and air...

  19. Implementation and main results Ecient Management of HVAC Systems

    E-Print Network [OSTI]

    Schenato, Luca

    Motivation Implementation and main results Ecient Management of HVAC Systems Mirco Rampazzo Management of HVAC Systems #12;Motivation Implementation and main results Outline 1 Motivation HVAC Systems Multiple-chiller systems 2 Implementation and main results Models, Control and Optimization Examples Mirco

  20. Text-Alternative Version of Building America Webinar: High Performance HVAC Systems, Part II: Low-Load HVAC Systems for Single and Multifamily Applications

    Broader source: Energy.gov [DOE]

    Transcript for the Nov. 16 webinar, High Performance HVAC Systems, Part II: Low-Load HVAC Systems for Single and Multifamily Applications.

  1. Modeling and Simulation of HVAC Faulty Operations and Performance Degradation due to Maintenance Issues

    SciTech Connect (OSTI)

    Wang, Liping; Hong, Tianzhen

    2013-01-01

    Almost half of the total energy used in the U.S. buildings is consumed by heating, ventilation and air conditionings (HVAC) according to EIA statistics. Among various driving factors to energy performance of building, operations and maintenance play a significant role. Many researches have been done to look at design efficiencies and operational controls for improving energy performance of buildings, but very few study the impacts of HVAC systems maintenance. Different practices of HVAC system maintenance can result in substantial differences in building energy use. If a piece of HVAC equipment is not well maintained, its performance will degrade. If sensors used for control purpose are not calibrated, not only building energy usage could be dramatically increased, but also mechanical systems may not be able to satisfy indoor thermal comfort. Properly maintained HVAC systems can operate efficiently, improve occupant comfort, and prolong equipment service life. In the paper, maintenance practices for HVAC systems are presented based on literature reviews and discussions with HVAC engineers, building operators, facility managers, and commissioning agents. We categorize the maintenance practices into three levels depending on the maintenance effort and coverage: 1) proactive, performance-monitored maintenance; 2) preventive, scheduled maintenance; and 3) reactive, unplanned or no maintenance. A sampled list of maintenance issues, including cooling tower fouling, boiler/chiller fouling, refrigerant over or under charge, temperature sensor offset, outdoor air damper leakage, outdoor air screen blockage, outdoor air damper stuck at fully open position, and dirty filters are investigated in this study using field survey data and detailed simulation models. The energy impacts of both individual maintenance issue and combined scenarios for an office building with central VAV systems and central plant were evaluated by EnergyPlus simulations using three approaches: 1) direct modeling with EnergyPlus, 2) using the energy management system feature of EnergyPlus, and 3) modifying EnergyPlus source code. The results demonstrated the importance of maintenance for HVAC systems on energy performance of buildings. The research is intended to provide a guideline to help practitioners and building operators to gain the knowledge of maintaining HVAC systems in efficient operations, and prioritize HVAC maintenance work plan. The paper also discusses challenges of modeling building maintenance issues using energy simulation programs.

  2. Energy Savings with Energy-Efficient HVAC Systems in Commercial Buildings of Hong Kong 

    E-Print Network [OSTI]

    Yang, J.; Chan, K.; Wu, X.

    2006-01-01

    Kong for sustainable development. In this study, the major factors influencing the electricity use of HVAC systems are studied with the building energy simulation program EnergyPlus, which include chiller efficiency, space cooling temperature, variable...

  3. Pitfalls in Building and HVAC Systems 

    E-Print Network [OSTI]

    Gidwani, B. N.

    1985-01-01

    AND HVAC SYSTEMS B. N. Gidwani, P.E. Roy F. Weston, Inc. West Chester, Pennsylvania ABSTRACT The purpose of an energy audit is to identify and analyze areas of energy consumption and to pro pose methods of conservation. In the process... opportunities for energy savings. When performing a detailed energy audit, the fol lowing areas should be examined with respect to the building envelope: Walls ? Roofs ? Windows ? Doors ? Ceiling Height ? In order to minimize energy losses through...

  4. Low-Global Warming Potential HVAC System with Ultra-Small Centrifugal...

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

    Global Warming Potential HVAC System with Ultra-Small Centrifugal Compression Low-Global Warming Potential HVAC System with Ultra-Small Centrifugal Compression Mechanical...

  5. Improving the Efficiency of Light-Duty Vehicle HVAC Systems using...

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

    Light-Duty Vehicle HVAC Systems using Zonal Thermoelectric Devices and Comfort Modeling Improving the Efficiency of Light-Duty Vehicle HVAC Systems using Zonal Thermoelectric...

  6. HVAC & Building Management Control System Energy Efficiency Replacements

    SciTech Connect (OSTI)

    Hernandez, Adriana

    2012-09-21

    The project objective was the replacement of an aging, un-repairable HVAC system which has grown inefficient and a huge energy consumer with low energy and efficient HVAC units, and installation of energy efficient building control technologies at City's YMCA Community Center.

  7. FAULT DETECTION IN HVAC SYSTEMS USING MODEL-BASED FEEDFORWARD CONTROL

    E-Print Network [OSTI]

    Diamond, Richard

    the controller with a simulated dual-duct air-handling unit. We also discuss recent experiences of implementing, Comfort/Energy, Control/Simulation/Field Tests, Air-Conditioning Systems, Feedforward Control, Diagnostics 1 INTRODUCTION Heating, ventilating, and air-conditioning (HVAC) systems are typically controlled

  8. The Optimization of Control Parameters for VAV HVAC System Commissioning 

    E-Print Network [OSTI]

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

    2006-01-01

    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...

  9. Case Study of an Innovative HVAC System with Integral Dehumidifier 

    E-Print Network [OSTI]

    Shirey, D. B.; Raustad, R. A.

    2008-01-01

    . Although this technology is not new, the integration of a dehumidification system with a standard air conditioner is an innovative strategy that can be used to address moisture control in buildings. This new HVAC configuration would provide a low...

  10. Evaluation of Emerging Diagnostic Tools for Commercial HVAC Systems 

    E-Print Network [OSTI]

    Friedman, H.; Piette, M. A.

    2001-01-01

    This paper compares and evaluates the capabilities of six emerging diagnostic tools for commercial HVAC systems. We present a brief description of the diagnostic tools, and then focus on evaluating the features of the tools. We include the following...

  11. A standard simulation testbed for the evaluation of control algorithms & strategies related to variable air volume HVAC systems

    E-Print Network [OSTI]

    DeSimone, Mark

    1995-01-01

    The parameters for a dynamic, computer simulation model were developed. The parameters characterize the physical and geometric properties of a building shell, the internal and external building loads, the buildings secondary ...

  12. Comparisons of HVAC Simulations between EnergyPlus and DOE-2.2 for Data Centers

    SciTech Connect (OSTI)

    Hong, Tianzhen; Sartor, Dale; Mathew, Paul; Yazdanian, Mehry

    2008-08-13

    This paper compares HVAC simulations between EnergyPlus and DOE-2.2 for data centers. The HVAC systems studied in the paper are packaged direct expansion air-cooled single zone systems with and without air economizer. Four climate zones are chosen for the study - San Francisco, Miami, Chicago, and Phoenix. EnergyPlus version 2.1 and DOE-2.2 version 45 are used in the annual energy simulations. The annual cooling electric consumption calculated by EnergyPlus and DOE-2.2 are reasonablely matched within a range of -0.4percent to 8.6percent. The paper also discusses sources of differences beween EnergyPlus and DOE-2.2 runs including cooling coil algorithm, performance curves, and important energy model inputs.

  13. Review of Residential Low-Load HVAC Systems

    SciTech Connect (OSTI)

    Brown, Scott A.; Thornton, Brian; Widder, Sarah H.

    2013-09-01

    In support of the U.S. Department of Energy’s (DOE’s) Building America Program, Pacific Northwest National Laboratory (PNNL) conducted an investigation to inventory commercially available HVAC technologies that are being installed in low-load homes. The first step in this investigation was to conduct a review of published literature to identify low-load HVAC technologies available in the United States and abroad, and document the findings of existing case studies that have evaluated the performance of the identified technologies. This report presents the findings of the literature review, identifies gaps in the literature or technical understanding that must be addressed before low-load HVAC technologies can be fully evaluated, and introduces PNNL’s planned research and analysis for this project to address identified gaps and potential future work on residential low-load HVAC systems.

  14. COMPARATIVE STUDY AMONG HYBRID GROUND SOURCE HEAT PUMP SYSTEM, COMPLETE GROUND SOURCE HEAT PUMP AND CONVENTIONAL HVAC SYSTEM

    SciTech Connect (OSTI)

    Jiang Zhu; Yong X. Tao

    2011-11-01

    In this paper, a hotel with hybrid geothermal heat pump system (HyGSHP) in the Pensacola is selected and simulated by the transient simulation software package TRNSYS [1]. To verify the simulation results, the validations are conducted by using the monthly average entering water temperature, monthly facility consumption data, and etc. And three types of HVAC systems are compared based on the same building model and HVAC system capacity. The results are presented to show the advantages and disadvantages of HyGSHP compared with the other two systems in terms of energy consumptions, life cycle cost analysis.

  15. MODELING AND SIMULATION OF HVAC FAULTS IN ENERGYPLUS

    E-Print Network [OSTI]

    Basarkar, Mangesh

    2013-01-01

    http://www.eia.doe.gov/emeu/cbecs/ EnergyPlus. 2011, http://of HVAC Results in EnergyPlus Mangesh Basarkar, XiufengOF HVAC FAULTS IN ENERGYPLUS Mangesh Basarkar, Xiufeng Pang,

  16. Software-as-a-Service Optimised Scheduling of a Solar-Assisted HVAC System with Thermal Storage

    E-Print Network [OSTI]

    Mammoli, Andrea

    2014-01-01

    Assisted HVAC System with Thermal Storage A. Mammoli a , M.HVAC system with thermal storage. Energy and Buildings, 42(ASSISTED HVAC SYSTEM WITH THERMAL STORAGE A. Mammoli a , M.

  17. An Application of State-Of-The-Art HVAC and Building Systems 

    E-Print Network [OSTI]

    Fiorino, D. P.

    1988-01-01

    This case study describes the successful application of state-of-the-art HVAC and building systems at a large commercial office and industrial facility. The facility's exterior envelope systems, HVAC systems, lighting ...

  18. Energy-Efficient Building HVAC Control Using Hybrid System LBMPC

    E-Print Network [OSTI]

    Aswani, Anil; Taneja, Jay; Krioukov, Andrew; Culler, David; Tomlin, Claire

    2012-01-01

    Improving the energy-efficiency of heating, ventilation, and air-conditioning (HVAC) systems has the potential to realize large economic and societal benefits. This paper concerns the system identification of a hybrid system model of a building-wide HVAC system and its subsequent control using a hybrid system formulation of learning-based model predictive control (LBMPC). Here, the learning refers to model updates to the hybrid system model that incorporate the heating effects due to occupancy, solar effects, outside air temperature (OAT), and equipment, in addition to integrator dynamics inherently present in low-level control. Though we make significant modeling simplifications, our corresponding controller that uses this model is able to experimentally achieve a large reduction in energy usage without any degradations in occupant comfort. It is in this way that we justify the modeling simplifications that we have made. We conclude by presenting results from experiments on our building HVAC testbed, which s...

  19. Variable-Speed, Low-Cost Motor for Residential HVAC Systems ...

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

    HVAC Systems Variable-Speed, Low-Cost Motor for Residential HVAC Systems Lower-Cost, Variable-Speed Electric Motor Improves Energy Efficiency In 2011, the U.S. industrial,...

  20. RF propagation in an HVAC duct system: impulse response characteristics of the channel

    E-Print Network [OSTI]

    Stancil, Daniel D.

    RF propagation in an HVAC duct system: impulse response characteristics of the channel Pavel V, the heating, ventilation, and air conditioning (HVAC) duct system in buildings is a complex network of hollow at RF and microwave frequencies of com- mon interest. HVAC ducts can be used as a wireless communication

  1. System-Level Monitoring and Diagnosis of Building HVAC System

    E-Print Network [OSTI]

    Wu, Siyu

    2013-01-01

    and global relationships between end-use energy consumptionHVAC Energy Consumption Due to rapid global population

  2. Measuring Advances in HVAC Distribution System Design

    SciTech Connect (OSTI)

    Franconi, E.

    1998-05-01

    Substantial commercial building energy savings have been achieved by improving the performance of the HV AC distribution system. The energy savings result from distribution system design improvements, advanced control capabilities, and use of variable-speed motors. Yet, much of the commercial building stock remains equipped with inefficient systems. Contributing to this is the absence of a definition for distribution system efficiency as well as the analysis methods for quantifying performance. This research investigates the application of performance indices to assess design advancements in commercial building thermal distribution systems. The index definitions are based on a first and second law of thermodynamics analysis of the system. The second law or availability analysis enables the determination of the true efficiency of the system. Availability analysis is a convenient way to make system efficiency comparisons since performance is evaluated relative to an ideal process. A TRNSYS simulation model is developed to analyze the performance of two distribution system types, a constant air volume system and a variable air volume system, that serve one floor of a large office building. Performance indices are calculated using the simulation results to compare the performance of the two systems types in several locations. Changes in index values are compared to changes in plant energy, costs, and carbon emissions to explore the ability of the indices to estimate these quantities.

  3. A systems approach to retrofitting residential HVAC systems

    SciTech Connect (OSTI)

    McWilliams, J.A.; Walker, I.S.

    2004-05-01

    A Best Practices Guide for retrofitting residential HVAC systems has recently been completed by DOE. The guide uses diagnostics and checklists to guide the user to specific retrofit packages that maximize retrofit energy savings, comfort and safety potential. The guide uses a systems approach to retrofitting where the interaction of different building components is considered throughout the retrofit selection process. For example, added building envelope insulation reduces building loads so that smaller capacity HVAC systems can be used. In this study, several houses were surveyed using the Best Practices Guide and a single house was selected for retrofitting. The objectives were to demonstrate how a successful system-wide retrofit can be carried out and to provide feedback to improve the guide. Because it represents a departure from current practice, a key aspect of this study was to investigate the interactions with contractors and code officials who are unfamiliar with the systems approach. The study found that the major barrier to the systems approach in retrofits was in changing the working practices of contractors and code officials.

  4. Model Predictive Control of HVAC Systems: Implementation and Testing at the University of California, Merced

    E-Print Network [OSTI]

    Haves, Phillip

    2010-01-01

    plants  with  thermal  storage.   The  project objectives systems with  active thermal storage systems in commercial of  HVAC  systems  with  thermal  storage.   Modulation  of 

  5. Integrated Heat Pump HVAC Systems for Near-Zero-Energy Homes - Business Case Assessment

    SciTech Connect (OSTI)

    Baxter, Van D

    2007-05-01

    The long range strategic goal of the Department of Energy's Building Technologies (DOE/BT) Program is to create, by 2020, technologies and design approaches that enable the construction of net-zero energy homes at low incremental cost (DOE/BT 2005). A net zero energy home (NZEH) is a residential building with greatly reduced needs for energy through efficiency gains, with the balance of energy needs supplied by renewable technologies. While initially focused on new construction, these technologies and design approaches are intended to have application to buildings constructed before 2020 as well resulting in substantial reduction in energy use for all building types and ages. DOE/BT's Emerging Technologies (ET) team is working to support this strategic goal by identifying and developing advanced heating, ventilating, air-conditioning, and water heating (HVAC/WH) technology options applicable to NZEHs. Although the energy efficiency of heating, ventilating, and air-conditioning (HVAC) equipment has increased substantially in recent years, new approaches are needed to continue this trend. Dramatic efficiency improvements are necessary to enable progress toward the NZEH goals, and will require a radical rethinking of opportunities to improve system performance. The large reductions in HVAC energy consumption necessary to support the NZEH goals require a systems-oriented analysis approach that characterizes each element of energy consumption, identifies alternatives, and determines the most cost-effective combination of options. In particular, HVAC equipment must be developed that addresses the range of special needs of NZEH applications in the areas of reduced HVAC and water heating energy use, humidity control, ventilation, uniform comfort, and ease of zoning. In FY05 ORNL conducted an initial Stage 1 (Applied Research) scoping assessment of HVAC/WH systems options for future NZEHs to help DOE/BT identify and prioritize alternative approaches for further development. Eleven system concepts with central air distribution ducting and nine multi-zone systems were selected and their annual and peak demand performance estimated for five locations: Atlanta (mixed-humid), Houston (hot-humid), Phoenix (hot-dry), San Francisco (marine), and Chicago (cold). Performance was estimated by simulating the systems using the TRNSYS simulation engine (Solar Energy Laboratory et al. 2006) in two 1800-ft{sup 2} houses--a Building America (BA) benchmark house and a prototype NZEH taken from BEopt results at the take-off (or crossover) point (i.e., a house incorporating those design features such that further progress towards ZEH is through the addition of photovoltaic power sources, as determined by current BEopt analyses conducted by NREL). Results were summarized in a project report, 'HVAC Equipment Design options for Near-Zero-Energy Homes--A Stage 2 Scoping Assessment', ORNL/TM-2005/194 (Baxter 2005). The 2005 study report describes the HVAC options considered, the ranking criteria used, and the system rankings by priority. Table 1 summarizes the energy savings potential of the highest scoring options from the 2005 study for all five locations. All system options were scored by the ORNL building equipment research team and by William Goetzler of Navigant Consulting. These scores were reviewed by DOE/BT's Residential Integration program leaders and Building America team members. Based on these results, the two centrally ducted integrated heat pump (IHP) systems (air source and ground source versions) were selected for advancement to Stage 2 (Exploratory Development) business case assessments in FY06. This report describes results of these business case assessments. It is a compilation of three separate reports describing the initial business case study (Baxter 2006a), an update to evaluate the impact of an economizer cooling option (Baxter 2006b), and a second update to evaluate the impact of a winter humidification option (Baxter 2007). In addition it reports some corrections made subsequent to release of the first two reports to correct so

  6. Multi-objective optimization of the HVAC (heating, ventilation, and air conditioning) system performance

    E-Print Network [OSTI]

    Kusiak, Andrew

    Multi-objective optimization of the HVAC (heating, ventilation, and air conditioning) system, ventilation, and air conditioning) system in a typical office facility is presented. A multi-layer perceptron. 1. Introduction HVAC (heating, ventilating and air conditioning) systems are designed to maintain

  7. Design of Control Systems for HVAC Applications 

    E-Print Network [OSTI]

    Smith, A. L.

    1984-01-01

    The design and application of temperature control systems on a commercial building will bring the question to mind: Should the system be Pneumatic? Should it be Electronic? There is concern as to which system will be more appropriate to a certain...

  8. Reliability and Functional Availability of HVAC Systems 

    E-Print Network [OSTI]

    Myrefelt, S.

    2004-01-01

    the probability that a component or a system works when no maintenance is made. A system with a high reliability thus has minimal maintenance requirements; it is a robust system. The decision capability is used to assess the organisation?s capacity to start... the system is in operation in relation to intended operating time. It mainly shows the technical capability to keep on operating while maintenance is being carried out. Systems that must be taken out of operation for longer repair works have a lower level...

  9. Thermal Storage Options for HVAC Systems 

    E-Print Network [OSTI]

    Weston, R. F.; Gidwani, B. N.

    1986-01-01

    is based on the specific heat of water rather than the latent 'heat of fusion of ice as in ice storage, it requires about 4 times the storage capacity of an equivalent ice storage system. ? Salt Storage: This system utilizes eutectic salts which... freeze and melt around 47 o F. Exist ing chillers can be easily retrofitted for salt storage or chilled water storage. For ice stor age systems, a direct refrigerant system or glycol chillers are suitable. This paper discusses the details of each...

  10. Index to Evaluate Energy Efficiency of the Building HVAC System 

    E-Print Network [OSTI]

    Wang, L.; Wang, L.; Claridge,D.

    2014-01-01

    Efficiency of the Entire Building HVAC System Presented by Dr. Claridge Date: 09/15/2014 ESL-IC-14-09-15 Proceedings of the 14th International Conference for Enhanced Building Operations, Beijing, China, September 14-17, 2014 2Outline •Why we need the Energy.../Load Ratio •How to get the Energy/Load Ratio •Methodology Adjustment •Case Study •Results Showed by tables and Plots ESL-IC-14-09-15 Proceedings of the 14th International Conference for Enhanced Building Operations, Beijing, China, September 14-17, 2014 3...

  11. Software-as-a-Service Optimised Scheduling of a Solar-Assisted HVAC System with Thermal Storage

    E-Print Network [OSTI]

    Mammoli, Andrea

    2014-01-01

    of a solar-thermal- assisted hvac system. Energy andsolar thermal collectors using flat reflective surfaces. Solar Energy,of a solar-assisted HVAC system with thermal storage. Energy

  12. Seamless Handover in Buildings Using HVAC Ducts: A New System Architecture

    E-Print Network [OSTI]

    Stancil, Daniel D.

    Seamless Handover in Buildings Using HVAC Ducts: A New System Architecture Ariton E. Xhafa, Paisarn ducts for wireless communications. The proposed solution is based on a new system architecture design of the indoor wireless networks that use the heating, ventilation, and air conditioning (HVAC) ducts

  13. Electric, Gas, and Electric/Gas Energy Options for Cold-Air HVAC Systems 

    E-Print Network [OSTI]

    Meckler, G.

    1989-01-01

    An important aspect of the design of cost-effective HVAC systems today is (a) sensitivity to the cost impact of the interplay of utility demand charges, time-of-day rates, gas rates, and gas/electric utility incentive programs vis-ŕ-vis HVAC system...

  14. Wireless Demand Response Controls for HVAC Systems

    SciTech Connect (OSTI)

    Federspiel, Clifford

    2009-06-30

    The objectives of this scoping study were to develop and test control software and wireless hardware that could enable closed-loop, zone-temperature-based demand response in buildings that have either pneumatic controls or legacy digital controls that cannot be used as part of a demand response automation system. We designed a SOAP client that is compatible with the Demand Response Automation Server (DRAS) being used by the IOUs in California for their CPP program, design the DR control software, investigated the use of cellular routers for connecting to the DRAS, and tested the wireless DR system with an emulator running a calibrated model of a working building. The results show that the wireless DR system can shed approximately 1.5 Watts per design CFM on the design day in a hot, inland climate in California while keeping temperatures within the limits of ASHRAE Standard 55: Thermal Environmental Conditions for Human Occupancy.

  15. Case study field evaluation of a systems approach to retrofitting a residential HVAC system

    SciTech Connect (OSTI)

    Walker, Iain S.; McWiliams, Jennifer A.; Konopacki, Steven J.

    2003-09-01

    This case study focusing on a residence in northern California was undertaken as a demonstration of the potential of a systems approach to HVAC retrofits. The systems approach means that other retrofits that can affect the HVAC system are also considered. For example, added building envelope insulation reduces building loads so that smaller capacity HVAC system can be used. Secondly, we wanted to examine the practical issues and interactions with contractors and code officials required to accomplish the systems approach because it represents a departure from current practice. We identified problems in the processes of communication and installation of the retrofit that led to compromises in the final energy efficiency of the HVAC system. These issues must be overcome in order for HVAC retrofits to deliver the increased performance that they promise. The experience gained in this case study was used to optimize best practices guidelines for contractors (Walker 2003) that include building diagnostics and checklists as tools to assist in ensuring the energy efficiency of ''house as a system'' HVAC retrofits. The best practices guidelines proved to be an excellent tool for evaluating the eight existing homes in this study, and we received positive feedback from many potential users who reviewed and used them. In addition, we were able to substantially improve the energy efficiency of the retrofitted case study house by adding envelope insulation, a more efficient furnace and air conditioner, an economizer and by reducing duct leakage.

  16. Microsoft Word - HVAC_20100824.doc

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    design for the High-Level Waste (HLW) Vitrification Facility's heating, ventilation and air-conditioning (HVAC) system. Critical to facility operations, the HVAC system will...

  17. Energy Conservation Studies of Existing HVAC Systems 

    E-Print Network [OSTI]

    Patterson, C. L.; Phelan, T. R.

    1985-01-01

    that projected savings can be real ized. The following examples are from an electronics manufacturing facility. Over 140 air handlers serving offices, laboratori es and clean roan manu facturing areas were investigated. The design cooling load of the central... preventive maintenance program with regular tube cleaning intervals, automated brush clean system for condensers, and proper condenser water chemical treatment would provide effective means of controlling the deterioration of fouling factors. ? Increase...

  18. Case Studies of Commissioning HVAC Systems 

    E-Print Network [OSTI]

    Browning, B. K.

    2001-01-01

    and changed in character, but not eliminated. As shown by Figure 3, the space relative humidity was still very high, but now the problem was primarily during unoccupied periods. 70.0 72.5 75.0 77.5 60 70 80 60 80 17 Sun 18 Mon 19 Tue 20 Wed 21 Thu 22 Fri 23... & condenser. He felt it was wise to check before starting the system. 70 75 80 60 70 80 60 70 80 29 Sat May 99 30 Sun 31 Mon 1 Jun 2 Wed 3 Thu 4 Fri Deg FDeg F% RH se7.pl1 Space Temp 1-2 Supply Temp Space RH Figure 6 - Space Temp, Supply Temp, & Relative...

  19. Measurements of Smoke Characteristics in HVAC Ducts 

    E-Print Network [OSTI]

    Wolin, Steven D; Ryder, Noah L; Leprince, Frederic; Milke, James; Mowrer, Frederick; Torero, Jose L

    2001-01-01

    The characteristics of smoke traveling in an HVAC duct have been observed along with the response of selected duct smoke detectors. The simulated HVAC system consists of a 9 m long duct, 0.45 m in diameter. An exhaust fan is placed at one end...

  20. Vehicle & Systems Simulation & Testing

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

    EV - EVSE Interoperability Advanced Charging Grid Integration Vehicle Systems Optimization Fast and Wireless Charging Grid Integration Load Reduction, HVAC, & Preconditioning...

  1. Dynamic Modeling and Wavelet-Based Multi-Parametric Tuning and Validation for HVAC Systems 

    E-Print Network [OSTI]

    Liang, Shuangshuang

    2014-07-10

    Dynamic Heating, Ventilation, and Air-Conditioning (HVAC) system models are used for the purpose of control design, fault detection and diagnosis, system analysis, design and optimization. Therefore, ensuring the accuracy ...

  2. Direct Digital Control- A Tool for Energy Management of HVAC Systems 

    E-Print Network [OSTI]

    Swanson, K.

    1993-01-01

    Direct digital control (DDC) applied to heating, ventilating, and air-conditioning (HVAC) systems corrects many of the deficiencies of conventional automatic temperature control systems. By applying new control sequences, ...

  3. HVAC Market Study:

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    HVAC Market Study: Understanding how energy efficient products get to market Fall 2014 through Winter 2015 Research Manager: Carrie Cobb, clcobb@bpa.gov, 503-230-4985 HVAC systems...

  4. A Unified and Integrated Energy Management System for HVAC Spaces and Power House 

    E-Print Network [OSTI]

    Kaya, A.; Debban, G. D.

    1988-01-01

    AND INTEGRATED ENERGY MANAGEMENT SYSTEM FOR HVAC SPACES AND POWER HOUSE A.Kaya The University of Akron Mechanical Engineering Akron,OH 44325 ABSTRACT This paper describes a totally integrated energy management system throughout the plant and facilities.... The equipment involves: the power flant (boilers, cogeneration turbines, chillers); HVAC 0 buildings; air handling and other distribution systems. The energy management system has the architecture for data transmission and processing including multilevel...

  5. Analysis of Innovative HVAC System Technologies and Their Application for Office Buildings in Hot and Humid Climates 

    E-Print Network [OSTI]

    Tanskyi, Oleksandr

    2012-02-14

    parameters for the Wisenbaker Engineering Research Center HVAC system simulation model.................................................................. 66 Table 3.8. DOE-2.1E system hourly reports variables... used in commercial buildings design are not adequate to save energy in both depth (savings per square foot) and scale (square footage improved each year) (RMI 2010). There are several ways to decrease energy consumption and CO2 emission caused...

  6. Optimization of Ice Thermal Storage Systems Design for HVAC Systems 

    E-Print Network [OSTI]

    Nassif, N.; Hall, C.; Freelnad, D.

    2013-01-01

    energy cost. A tool for optimal ice storage design is developed, considering the charging and discharge times and optimal sizing of ice thermal storage system. Detailed simulation studies using real office building located near Orlando, FL including...

  7. MODELING AND SIMULATION OF HVAC FAULTS IN ENERGYPLUS

    E-Print Network [OSTI]

    Basarkar, Mangesh

    2013-01-01

    and simulated building energy performance, Norford et al. (faults on whole building performance – energy consumption,and simulated energy performance of buildings is that most

  8. Analysis of the HVAC System at the Willow Branch Intermediate School 

    E-Print Network [OSTI]

    Wei, G.

    1997-01-01

    This report presents an analysis of the HVAC system at the Willow Branch Intermediate School for the MEEN 685 class project. The school is located at College Station, Texas. A portion of the school belonged to Oakwood Intermediate School which...

  9. Computational Study on Thermal Properties of HVAC System with Building Structure Thermal Storage 

    E-Print Network [OSTI]

    Sato, Y.; Sagara, N.; Ryu, Y.; Maehara, K.; Nagai, T.

    2007-01-01

    Building structure thermal storage (BSTS) HVAC systems can store heat during nighttime thermal storage operation (nighttime operation hours) by using off-peak electricity and release it in the daytime air-conditioning operation (daytime operation...

  10. CO2 - Based Demand-Controlled Ventilation Control Strategies for Multi-Zone HVAC Systems 

    E-Print Network [OSTI]

    Nassif, N.

    2011-01-01

    CO2-based demand-controlled ventilation DCV strategy offers a great opportunity to reduce energy consumption in HVAC systems while providing the required ventilation. However, implementing CO2-based DCV under ASHRAE 62.1.2004 through 2010...

  11. Energy Master Plans for Sustainable, High Performance HVAC and Associated Systems for Hot and Humid Climates 

    E-Print Network [OSTI]

    Maisey, G. E.; Milestone, B.

    2004-01-01

    for SUSTAINABLE, HIGH PERFORMANCE HVAC & ASSOCIATED SYSTEMS for HOT AND HUMID CLIMATES Grahame E. Maisey, P.E. Beverly Milestone Chief Engineer President GEMCO Energy Master Planners GEMCO Energy Master Planners Div. of Building... the pieces of true sustainable design and then assemble the pieces into whole sustainable, high performance HVAC systems. These are presented to the owner as the target to reach. A detailed, in depth energy master plan is the ideal way to achieve...

  12. Improving the Efficiency of Light-Duty Vehicle HVAC Systems using Zonal Thermoelectric Devices and Comfort Modeling

    Broader source: Energy.gov [DOE]

    Summarizes results from a study to identify and demonstrate technical and commercial approaches necessary to accelerate the deployment of zonal TE HVAC systems in light-duty vehicles

  13. ETME 422 -REFRIGERATION & HVAC SYSTEMS FALL 2011 LEC -10:00 -10:50am M W F RH 312

    E-Print Network [OSTI]

    Dyer, Bill

    , fans, compressors, heat exchangers, heaters, refrigerators, etc.) of heating, ventilation, air Load - Introduction HVAC Systems Comfort and Health Solar Radiation Radiant Time Series Method Moist

  14. Software-as-a-Service Optimised Scheduling of a Solar-Assisted HVAC System with Thermal Storage

    E-Print Network [OSTI]

    Mammoli, Andrea

    2014-01-01

    1980, but its thermal solar and storage systems received achiller. A 30 m heat storage tank solar decouples heatfacility with thermal storage and solar- assisted HVAC for

  15. SIMULATION OF RESIDENTIAL HVAC SYSTEM PERFORMANCE

    E-Print Network [OSTI]

    ., and Degenetais, G. Environmental Energy Technologies Division Energy Performance of Buildings Group Lawrence Institute for Energy Efficiency (CIEE) through the U.S. Department of Energy. The research reported here was funded by the California Institute for Energy Efficiency (CIEE), a research unit of the University

  16. MAPPING HVAC SYSTEMS FOR SIMULATION IN ENERGYPLUS

    E-Print Network [OSTI]

    Basarkar, Mangesh

    2013-01-01

    apps1.eere.energy.gov/buildings/energyplus/. Modelica, 2012.Modelica andthe Modelica Association — Modelica Association [WWW

  17. Deposition of Biological Aerosols on HVAC Heat Exchangers

    E-Print Network [OSTI]

    on biological contamination on HVAC coils. Muyshondt et al. (1998) discuss the HVAC system as both a source

  18. Initial Business Case Analysis of Two Integrated Heat Pump HVAC Systems for Near-Zero-Energy Homes

    SciTech Connect (OSTI)

    Baxter, Van D

    2006-11-01

    The long range strategic goal of the Department of Energy's Building Technologies (DOE/BT) Program is to create, by 2020, technologies and design approaches that enable the construction of net-zero energy homes at low incremental cost (DOE/BT 2005). A net zero energy home (NZEH) is a residential building with greatly reduced needs for energy through efficiency gains, with the balance of energy needs supplied by renewable technologies. While initially focused on new construction, these technologies and design approaches are intended to have application to buildings constructed before 2020 as well resulting in substantial reduction in energy use for all building types and ages. DOE/BT's Emerging Technologies (ET) team is working to support this strategic goal by identifying and developing advanced heating, ventilating, air-conditioning, and water heating (HVAC/WH) technology options applicable to NZEHs. Although the energy efficiency of heating, ventilating, and air-conditioning (HVAC) equipment has increased substantially in recent years, new approaches are needed to continue this trend. Dramatic efficiency improvements are necessary to enable progress toward the NZEH goals, and will require a radical rethinking of opportunities to improve system performance. The large reductions in HVAC energy consumption necessary to support the NZEH goals require a systems-oriented analysis approach that characterizes each element of energy consumption, identifies alternatives, and determines the most cost-effective combination of options. In particular, HVAC equipment must be developed that addresses the range of special needs of NZEH applications in the areas of reduced HVAC and water heating energy use, humidity control, ventilation, uniform comfort, and ease of zoning. In FY05 ORNL conducted an initial Stage 1 (Applied Research) scoping assessment of HVAC/WH systems options for future NZEHs to help DOE/BT identify and prioritize alternative approaches for further development. Eleven system concepts with central air distribution ducting and nine multi-zone systems were selected and their annual and peak demand performance estimated for five locations: Atlanta (mixed-humid), Houston (hot-humid), Phoenix (hot-dry), San Francisco (marine), and Chicago (cold). Performance was estimated by simulating the systems using the TRNSYS simulation engine (Solar Energy Laboratory et al. 2006) in two 1800-ft{sup 2} houses--a Building America (BA) benchmark house and a prototype NZEH taken from BEopt results at the take-off (or crossover) point (i.e., a house incorporating those design features such that further progress towards ZEH is through the addition of photovoltaic power sources, as determined by current BEopt analyses conducted by NREL). Results were summarized in a project report, 'HVAC Equipment Design options for Near-Zero-Energy Homes--A Stage 2 Scoping Assessment,' ORNL/TM-2005/194 (Baxter 2005). The 2005 study report describes the HVAC options considered, the ranking criteria used, and the system rankings by priority. Table 1 summarizes the energy savings potential of the highest scoring options from the 2005 study for all five locations.

  19. EVALUATION OF EMERGING DIAGNOSTIC TOOLS FOR COMMERCIAL HVAC SYSTEMS Hannah Friedman Mary Ann Piette

    E-Print Network [OSTI]

    management control systems (EMCS), utility demand metering, and dedicated monitoring systems. By combining and Electric's Universal Translator, UC Berkeley's Fan System Tools, and Silicon Energy's Enterprise Energy, ventilating, and air-conditioning (HVAC) systems (Gregerson, 1997, Claridge et al., 2000). If these energy

  20. Minimization of energy consumption in HVAC systems with data-driven models and an interior-point method

    E-Print Network [OSTI]

    Kusiak, Andrew

    -driven approach is applied to minimize energy consumption of a heating, ventilating, and air conditioning (HVAC, ventilating and air conditioning (HVAC) systems have been recognized as major consumers of energy air conditioning system. Parameshwaran et al. [9] developed a genetic fuzzy optimization method

  1. Integrated high efficiency blower apparatus for HVAC systems

    DOE Patents [OSTI]

    Liu, Xiaoyue; Weigman, Herman; Wang, Shixiao

    2007-07-24

    An integrated centrifugal blower wheel for a heating, ventilation and air conditioning (HVAC) blower unit includes a first blade support, a second blade support, and a plurality of S-shaped blades disposed between the first and second blade supports, wherein each of the S-shaped blades has a trailing edge bent in a forward direction with respect to a defined direction of rotation of the wheel.

  2. Automated Testing of HVAC Systems for Commissioning Tim Salsbury and Rick Diamond

    E-Print Network [OSTI]

    Diamond, Richard

    carrying out a proof of operation. In large modern buildings, the energy management and control system monitoring period following each change in setpoint, characterize system performance. These indicesAutomated Testing of HVAC Systems for Commissioning Tim Salsbury and Rick Diamond Lawrence Berkeley

  3. System-Level Monitoring and Diagnosis of Building HVAC System

    E-Print Network [OSTI]

    Wu, Siyu

    2013-01-01

    695. [50] M. Wetter, Modelica-based modelling and simulationhave been working on Modelica and EnergyPlus simulation59], DOE-2, TRANSYS, Modelica [50], etc. make use of the

  4. System-Level Monitoring and Diagnosis of Building HVAC System

    E-Print Network [OSTI]

    Wu, Siyu

    2013-01-01

    integrated into building automation systems, particularlydata from existing building automation systems (BASs) forcapabilities of modern building automation and control

  5. A BEMS-Assisted Commissioning Tool to Improve the Energy Performance of HVAC Systems 

    E-Print Network [OSTI]

    Choiniere, D.; Corsi, M.

    2003-01-01

    -ASSISTED COMMISSIONING TOOL TO IMPROVE THE ENERGY PERFORMANCE OF HVAC SYSTEMS Daniel Choiničre Technology Expert CANMET-Energy Technology Centre Natural Resources Canada 1615 Lionel-Boulet Blvd., P.O. Box 4800, Varennes, Quebec, J3X 1S6, Canada Maria Corsi1...

  6. System-Level Monitoring and Diagnosis of Building HVAC System

    E-Print Network [OSTI]

    Wu, Siyu

    2013-01-01

    systems coupling on building energy performance, Energy andabout the building energy performance without consideringuser behavior on building energy performance [141]. With an

  7. Detection and diagnosis of faults and energy monitoring of HVAC systems with least-intrusive power analysis

    E-Print Network [OSTI]

    Luo, Dong, 1966-

    2001-01-01

    Faults indicate degradation or sudden failure of equipment in a system. Widely existing in heating, ventilating, and air conditioning (HVAC) systems, faults always lead to inefficient energy consumption, undesirable indoor ...

  8. Software-as-a-Service Optimised Scheduling of a Solar-Assisted HVAC System with Thermal Storage

    E-Print Network [OSTI]

    Mammoli, Andrea

    2014-01-01

    performance of a solar-thermal- assisted hvac system. Energyfor rows of fixed solar thermal collectors using flatassisted by a 232 m solar thermal array providing heat to a

  9. Predictive modeling and optimization of a multi-zone HVAC system with data mining and firefly algorithms

    E-Print Network [OSTI]

    Kusiak, Andrew

    . Sakulpipatsin et al. [6] proposed an extended method for energy and exergy analysis of HVAC systems data-driven framework is examined in the computational studies. A sensitivity analysis of the potential

  10. Optimized Fan Control In Variable Air Volume HVAC Systems Using Static Pressure Resets: Strategy Selection and Savings Analysis 

    E-Print Network [OSTI]

    Kimla, John

    2010-07-14

    The potential of static pressure reset (SPR) control to save fan energy in variable air volume HVAC systems has been well documented. Current research has focused on the creation of reset strategies depending on specific ...

  11. Proposal for the award of a contract for dismantling, removal and packaging of the existing Heating, Ventilation and Air-Conditioning (HVAC) systems in the PS tunnel

    E-Print Network [OSTI]

    2012-01-01

    Proposal for the award of a contract for dismantling, removal and packaging of the existing Heating, Ventilation and Air-Conditioning (HVAC) systems in the PS tunnel

  12. Proposal for the award of a contract for the design, supply, installation and commissioning of an HVAC (Heating, Ventilation and Air Conditioning) system for Building 3862

    E-Print Network [OSTI]

    2014-01-01

    Proposal for the award of a contract for the design, supply, installation and commissioning of an HVAC (Heating, Ventilation and Air Conditioning) system for Building 3862

  13. Energy Savings Potential of Flexible and Adaptive HVAC Distribution Systems for Office Buildings

    SciTech Connect (OSTI)

    Loftness, Vivian; Brahme, Rohini; Mondazzi, Michelle; Vineyard, Edward; MacDonald, Michael

    2002-06-01

    It has been understood by architects and engineers that office buildings with easily re-configurable space and flexible mechanical and electrical systems are able to provide comfort that increases worker productivity while using less energy. Raised floors are an example of how fresh air, thermal conditioning, lighting needs, and network access can be delivered in a flexible manner that is not ''embedded'' within the structure. What are not yet documented is how well these systems perform and how much energy they can save. This area is being investigated in phased projects of the 21st Century Research Program of the Air-conditioning and Refrigeration Technology Institute. For the initial project, research teams at the Center for Building Performance and Diagnostics, Pittsburgh, Pennsylvania, and Oak Ridge National Laboratory, Oak Ridge, Tennessee, documented the diversity, performance, and incidence of flexible and adaptive HVAC systems. Information was gathered worldwide from journal and conference articles, case studies, manufactured products and assemblies, and interviews with design professionals. Their report thoroughly describes the variety of system types along with the various design alternatives observed for plenums, diffusers, individual control, and system integration. Many of the systems are illustrated in the report and the authors provide quantitative and qualitative comparisons. Among conclusions regarding key design issues, and barriers to widespread adoption, the authors state that flexible and adaptive HVAC systems, such as underfloor air, perform as well if not better than ceiling-based systems. Leading engineers have become active proponents after their first experience, which is resulting in these flexible and adaptive HVAC systems approaching 10 percent of the new construction market. To encourage adoption of this technology that improves thermal comfort and indoor air quality, follow-on work is required to further document performance. Architects, professional engineers, and commercial real estate developers will benefit from the availability of information that quantifies energy savings, first cost construction differences, and additional operating costs created when office space must be reconfigured to accommodate new tenants.

  14. Continuous Energy Management of the HVAC&R System in an Office Building System Operation and Energy Consumption for the Eight Years after Building Completion 

    E-Print Network [OSTI]

    Akashi, Y.; Shinozaki, M.; Kusuda, R.; Ito, S.

    2006-01-01

    The authors continuously studied the energy consumption of a heating, ventilating, air- conditioning and refrigerating (HVAC&R) system in an office for the operation of the system in terms of its expected performance. A fault in the system control...

  15. Multi-Sensor Single-Actuator Control of HVAC Systems 

    E-Print Network [OSTI]

    Lin, C.; Auslander, D.; Federspiel, C.

    2002-01-01

    to replace the single sensor in one room with a network of sensors having at least one sensor per room. This paper addresses this multi-sensor, single-actuator control problem. We used computer simulations and optimization to study the problem. We designed a...

  16. Combined solar and internal load effects on selection of heat reclaim-economizer HVAC systems

    SciTech Connect (OSTI)

    Sauer, H.J. Jr.; Howell, R.H.; Wang, Z. . Dept. of Mechanical Engineering)

    1990-05-01

    The concern for energy conservation has led to the development and use of heat recovery systems which reclaim the building internal heat before it is discarded in the exhaust air. On the other hand, economizer cycles have been widely used for many years in a variety of types of HVAC systems. Economizer cycles are widely accepted as a means to reduce operating time for chilling equipment when cool outside air is available. It has been suggested that heat reclaim systems should not be used in conjunction with an HVAC system which incorporates an economizer cycle because the economizer operation would result in heat being exhausted which might have been recovered. Others suggest that the economizer cycle can be used economically in a heat recovery system if properly controlled to maintain an overall building heat balance. This study looks at potential energy savings of such combined systems with particular emphasis on the effects of the solar load (amount of glass) and the internal load level (lights, people, appliances, etc.). For systems without thermal storage, annual energy savings of up to 60 percent are predicted with the use of heat reclaim systems in conjunction with economizers when the heat reclaim has priority. These results demonstrate the necessity of complete engineering evaluations if proper selection and operation of combined heat recovery and economizer cycles are to be obtained. This paper includes the basic methodology for making such evaluations.

  17. Modeling and Control of AHUs in Building HVAC Systems

    E-Print Network [OSTI]

    Liang, Wei

    2014-01-01

    integration. R and is easily implemented into • The algorithm is based on WebCTRL , building automation systems.

  18. Plutonium Finishing Plant (PFP) HVAC System Component Index

    SciTech Connect (OSTI)

    DICK, J.D.

    2000-02-28

    The Plutonium Finishing Plant (PFP) WAC System includes sub-systems 25A through 25K. Specific system boundaries and justifications are contained in HNF-SD-CP-SDD-005, ''Definition and Means of Maintaining the Ventilation System Confinement Portion of the PFP Safety Envelope.'' The procurement requirements associated with the system necessitates procurement of some system equipment as Commercial Grade Items in accordance with HNF-PRO-268, ''Control of Purchased Items and Services.'' This document lists safety class and safety significant components for the Heating Ventilation Air Conditioning and specifies the critical characteristics for Commercial Grade Items, as required by HNF-PRO-268 and HNF-PRO-1819. These are the minimum specifications that the equipment must meet in order to properly perform its safety function. There may be several manufacturers or models that meet the critical characteristics for any one item.

  19. Building HVAC Control System Interaction Issues: Two Case Studies 

    E-Print Network [OSTI]

    Chen, Q.; Deng, S.; Toole, C.; Xu, C.

    2007-01-01

    the existing systems. This paper presents the CC measures identified in two case studies to improve building comfort and energy efficiency with minimal hardware investment....

  20. Low-Load HVAC Systems for Single and Multifamily Applications

    Energy Savers [EERE]

    during system on cycle Room-to-Thermostat Temperature Drift during unoccupied period Entry slightly warmer, balancing risk during winter Humidifier? May perform better in...

  1. Decentralized model predictive control of a multiple evaporator HVAC system 

    E-Print Network [OSTI]

    Elliott, Matthew Stuart

    2009-05-15

    Vapor compression cooling systems are the primary method used for refrigeration and air conditioning, and as such are a major component of household and commercial building energy consumption. Application of advanced control ...

  2. COMPREHENSIVE DIAGNOSTIC AND IMPROVEMENT TOOLS FOR HVAC-SYSTEM INSTALLATIONS IN LIGHT COMMERCIAL BUILDINGS

    SciTech Connect (OSTI)

    Abram Conant; Mark Modera; Joe Pira; John Proctor; Mike Gebbie

    2004-10-31

    Proctor Engineering Group, Ltd. (PEG) and Carrier-Aeroseal LLP performed an investigation of opportunities for improving air conditioning and heating system performance in existing light commercial buildings. Comprehensive diagnostic and improvement tools were created to address equipment performance parameters (including airflow, refrigerant charge, and economizer operation), duct-system performance (including duct leakage, zonal flows and thermal-energy delivery), and combustion appliance safety within these buildings. This investigation, sponsored by the National Energy Technology Laboratory, a division of the U.S. Department of Energy, involved collaboration between PEG and Aeroseal in order to refine three technologies previously developed for the residential market: (1) an aerosol-based duct sealing technology that allows the ducts to be sealed remotely (i.e., without removing the ceiling tiles), (2) a computer-driven diagnostic and improvement-tracking tool for residential duct installations, and (3) an integrated diagnosis verification and customer satisfaction system utilizing a combined computer/human expert system for HVAC performance. Prior to this work the aerosol-sealing technology was virtually untested in the light commercial sector--mostly because the savings potential and practicality of this or any other type of duct sealing had not been documented. Based upon the field experiences of PEG and Aeroseal, the overall product was tailored to suit the skill sets of typical HVAC-contractor personnel.

  3. The Effect of Optimal Tuning of the Heating/Cooling Curve in AHU of HVAC System in Real Practice 

    E-Print Network [OSTI]

    2004-01-01

    TNO Bouw, The Netherlands Page: 1 of 12 THE EFFECT OF OPTIMAL TUNING OF THE HEATING-/ COOLING CURVE IN AHU OF HVAC SYSTEM IN REAL PRACTISE P.A. (Bert) Elkhuizen(1), J.E. (Jan Ewout) Scholten(1), H.C. (Henk) Peitsman(1), A (Ad) Kooijman (2... of the heating/ cooling curve in the central Air Handling Unit?s (AHU?s) of HVAC systems without loss of comfort. In most cases the number of complaints will also be reduced. The method can be used in both new and existing buildings. The approach will generate...

  4. VOLUME 11, NUMBER 2 HVAC&R RESEARCH APRIL 2005 Ground-Source Heat Pump System Research--

    E-Print Network [OSTI]

    VOLUME 11, NUMBER 2 HVAC&R RESEARCH APRIL 2005 165 EDITORIAL Ground-Source Heat Pump System Research-- Past, Present, and Future J.D. Spitler, PhD, PE Fellow ASHRAE Ground-source heat pump (GSHP to Heinrich Zoelly is the first known reference to ground-source heat pump systems.2 In the US, some ground-source

  5. Development of a High-Efficiency Zonal Thermoelectric HVAC System for Automotive Applications

    Broader source: Energy.gov [DOE]

    Identify a technical and business approach to accelerate the deployment of light-duty automotive TE HVAC technology, maintain occupant comfort, and improve energy efficiency.

  6. Value impact analysis of Generic Issue 143, Availability of Heating, Ventilation, Air Conditioning (HVAC) and Chilled Water Systems

    SciTech Connect (OSTI)

    Daling, P.M.; Marler, J.E.; Vo, T.V.; Phan, H.; Friley, J.R. [Pacific Northwest Lab., Richland, WA (United States)

    1993-11-01

    This study evaluates the values (benefits) and impacts (costs) associated with potential resolutions to Generic Issue 143, ``Availability of HVAC and Chilled Water Systems.`` The study identifies vulnerabilities related to failures of HVAC, chilled water, and room cooling systems; develops estimates of room heatup rates and safety-related equipment vulnerabilities following losses of HVAC/room cooler systems; develops estimates of the core damage frequencies and public risks associated with failures of these systems; develops three proposed resolution strategies to this generic issue; and performs a value/impact analysis of the proposed resolutions. Existing probabilistic risk assessments for four representative plants, including one plant from each vendor, form the basis for the core damage frequency and public risk calculations. Both internal and external events were considered. It was concluded that all three proposed resolution strategies exceed the $1,000/person-rem cost-effectiveness ratio. Additional evaluations were performed to develop ``generic`` insights on potential design-related and configuration-related vulnerabilities and potential high-frequency ({approximately}1E-04/RY) accident sequences that involve failures of HVAC/room cooling functions. It was concluded that, although high-frequency accident sequences may exist at some plants, these high-frequency sequences are plant-specific in nature or have been resolved through hardware and/or operational changes. The plant-specific Individual Plant Examinations are an effective vehicle for identification and resolution of these plant-specific anomalies and hardware configurations.

  7. Chapter 5: Lighting, HVAC, and Plumbing

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

    : Lighting, HVAC, and Plumbing High-Performance Engineering Design Lighting System Design Mechanical System Design Central Plant Systems Plumbing and Water Use Building Control...

  8. Variable Refrigerant Flow HVAC 

    E-Print Network [OSTI]

    Jones, S.

    2013-01-01

    Variable refrigerant flow technology HVAC CATEE 2013 San Antonio, TX ESL-KT-13-12-33 CATEE 2013: Clean Air Through Energy Efficiency Conference, San Antonio, Texas Dec. 16-18 What is the acronym VRF? ? Variable Refrigerant Flow Operates like a... heat pump utilizing VFD Inverter Compressors and LEV’s Unlike conventional commercial and residential HVAC systems in the USA The predominate method of cooling and heating in the world ESL-KT-13-12-33 CATEE 2013: Clean Air Through Energy Efficiency...

  9. Energy Savings From System Efficiency Improvements in Iowa’s HVAC SAVE Program

    SciTech Connect (OSTI)

    Yee, S.; Baker, J.; Brand, L.; Wells, J.

    2013-08-01

    The objective of this project is to explore the energy savings potential of maximizing furnace and distribution system performance by adjusting operating, installation, and distribution conditions. The goal of the Iowa HVAC System Adjusted and Verified Efficiency (SAVE) program is to train contractors to measure installed system efficiency as a diagnostic tool to ensure that the homeowner achieves the energy reduction target for the home rather than simply performing a tune-up on the furnace or having a replacement furnace added to a leaky system. The PARR research team first examined baseline energy usage from a sample of 48 existing homes, before any repairs or adjustments were made, to calculate an average energy savings potential and to determine which system deficiencies were prevalent. The results of the baseline study of these homes found that, on average, about 10% of the space heating energy available from the furnace was not reaching the conditioned space. In the second part of the project, the team examined a sample of 10 homes that had completed the initial evaluation for more in-depth study. For these homes, the diagnostic data shows that it is possible to deliver up to 23% more energy from the furnace to the conditioned space by doing system tune ups with or without upgrading the furnace. Replacing the furnace provides additional energy reduction. The results support the author's belief that residential heating and cooling equipment should be tested and improved as a system rather than a collection of individual components.

  10. This paper has been downloaded from the Building and Environmental Thermal Systems Research Group at Oklahoma State University (www.hvac.okstate.edu)

    E-Print Network [OSTI]

    Simulation and Its Implementation in EnergyPlus. Proceedings of Building Simulation '99, Vol. 3, pp. 1245 IMPLEMENTATION IN ENERGYPLUS Daniel E Fisher1 , Russell D. Taylor2 , Fred Buhl3 , Richard J Liesen2 , and Richard K Strand4 ABSTRACT This paper presents the new EnergyPlus HVAC simulation environment, which differs

  11. Co-simulation of innovative integrated HVAC systems in buildings

    E-Print Network [OSTI]

    Trcka, Marija

    2010-01-01

    ESP-r [http://www.esru.strath.ac.uk], EnergyPlus [http://Morrison 2009], COMIS and EnergyPlus [Huang et al. 1999],McDowell et al. 2003], EnergyPlus and MIT-CFD [Zhai 2003],

  12. MODELING PARTICLE DEPOSITION ON HVAC HEAT EXCHANGERS

    E-Print Network [OSTI]

    in supplying ventilation and air conditioning. This paper explores mechanisms that cause particle deposition energy and indoor air quality degradation for heating, ventilating, and air conditioning (HVAC) systems

  13. Lighting/HVAC interactions and their effects on annual and peak HVAC requirements in commercial buildings

    SciTech Connect (OSTI)

    Sezgen, A.O.; Huang, Y.J.

    1994-08-01

    Lighting measures is one effective strategy for reducing energy use in commercial buildings. Reductions in lighting energy have secondary effects on cooling/heating energy consumption and peak HVAC requirements; in general, they increase the heating and decrease cooling requirements of a building. Net change in a building`s annual and peak energy requirements, however, is difficult to quantify and depends on building characteristics, operating conditions, climate. This paper characterizes impacts of lighting/HVAC interactions on annual and peak heating/cooling requirements of prototypical US commercial buildings through computer simulations using DOE-2.1E building energy analysis program. Ten building types of two vintages and nine climates are chosen to represent the US commercial building stock. For each combination, a prototypical building is simulated with two lighting power densities, and resultant changes in heating and cooling loads are recorded. Simple concepts of Lighting Coincidence Factors are used to describe the observed interactions between lighting and HVAC requirements. (Coincidence Factor (CF) is ratio of changes in HVAC loads to those in lighting loads, where load is either annual or peak load). The paper presents tables of lighting CF for major building types and climates. These parameters can be used for regional or national cost/benefit analyses of lighting- related policies and utility DSM programs. Using Annual CFs and typical efficiencies for heating and cooling systems, net changes in space conditioning energy use from a lighting measure can be calculated. Similarly, Demand CFs can be used to estimate the changes in HVAC sizing, which can then be converted to changes in capital outlay using standard-design curves; or they can be used to estimate coincident peak reductions for the analysis of the utility`s avoided costs. Results from use of these tables are meaningful only when they involve a significantly large number of buildings.

  14. Randomized Model Predictive Control for HVAC Systems Alessandra Parisio, Damiano Varagnolo, Daniel Risberg,

    E-Print Network [OSTI]

    Johansson, Karl Henrik

    temperature and CO2 con- centration levels. More specifically, we propose a random- ization technique Conditioning (HVAC) sys- tems play a fundamental role in maintaining acceptable ther- mal comfort and Indoor- pancy and weather conditions and uses them to build proba- bilistic constraints on the indoor

  15. IFC HVAC interface to EnergyPlus - A case of expanded interoperability for energy simulation

    E-Print Network [OSTI]

    Bazjanac, Vladimir; Maile, Tobias

    2004-01-01

    Schnittstelle für EnergyPlus (Development and Implementationof an IFC Interface to EnergyPlus), Masters Thesis, Institutof Energy (US-DOE). 2004. EnergyPlus Energy Simulation

  16. An evaluation of three commercially available technologies forreal-time measurement of rates of outdoor airflow into HVAC systems

    SciTech Connect (OSTI)

    Fisk, William J.; Faulkner, David; Sullivan, Douglas P.

    2004-10-28

    During the last few years, new technologies have been introduced for real-time continuous measurement of the flow rates of outdoor air (OA) into HVAC systems; however, an evaluation of these measurements technologies has not previously been published. This document describes a test system and protocols developed for a controlled evaluation of these measurement technologies. The results of tests of three commercially available measurement technologies are also summarized. The test system and protocol were judged practical and very useful. The three commercially available measurement technologies should provide reasonably, e.g., 20%, accurate measurements of OA flow rates as long as air velocities are maintained high enough to produce accurately measurable pressure signals. In HVAC systems with economizer controls, to maintain the required air velocities the OA intake will need to be divided into two sections in parallel, each with a separate OA damper. All of the measurement devices had pressure drops that are likely to be judged acceptable. The influence of wind on the accuracy of these measurement technologies still needs to be evaluated.

  17. An evaluation of technologies for real-time measurement of rates of outdoor airflow into HVAC systems

    SciTech Connect (OSTI)

    Fisk, William J.; Faulkner, David; Sullivan, Douglas P.

    2004-09-01

    During the last few years, new technologies have been introduced for real-time continuous measurement of the flow rates of outdoor air (OA) into HVAC systems; however, an evaluation of these measurement technologies has not previously been published. This document describes a test system and protocols developed for a controlled evaluation of these measurement technologies. The results of tests of four commercially available measurement technologies and one prototype based on a new design are also summarized. The test system and protocol were judged practical and very useful. The series of tests identified three commercially available measurement technologies that should provide reasonably accurate measurements of OA flow rates as long as air velocities are maintained high enough to produce accurately measurable pressure signals. In HVAC systems with economizer controls, to maintain the required air velocities the OA intake will need to be divided into two sections in parallel, each with a separate OA damper. The errors in OA flow rates measured with the fourth commercially available measurement technology were 20% to 30% with horizontal probes but much larger with vertical probes. The new prototype measurement technology was the only one that appears suitable for measuring OA flow rates over their full range from 20% OA to 100% OA without using two separate OA dampers. All of the measurement devices had pressure drops that are likely to be judged acceptable. The influence of wind on the accuracy of these measurement technologies still needs to be evaluated.

  18. This paper has been downloaded from the Building and Environmental Thermal Systems Research Group at Oklahoma State University (http://www.hvac.okstate.edu).

    E-Print Network [OSTI]

    .D., and J. Cullin. 2008. Misconceptions Regarding Design of Ground-source Heat Pump Systems. Proceedings of Ground-source Heat Pump Systems Prof. Jeffrey Spitler1 & James Cullin1 1 School of Mechanical-405-744-7873. Email: spitler@okstate.edu, http://www.hvac.okstate.edu 1 Introduction Ground-source heat pump (GSHP

  19. Initial Business Case Analysis of Two Integrated Heat Pump HVAC Systems for Near-Zero-Energy Homes - Update to Include Evaluation of Impact of Including a Humidifier Option

    SciTech Connect (OSTI)

    Baxter, Van D

    2007-02-01

    The long range strategic goal of the Department of Energy's Building Technologies (DOE/BT) Program is to create, by 2020, technologies and design approaches that enable the construction of net-zero energy homes at low incremental cost (DOE/BT 2005). A net zero energy home (NZEH) is a residential building with greatly reduced needs for energy through efficiency gains, with the balance of energy needs supplied by renewable technologies. While initially focused on new construction, these technologies and design approaches are intended to have application to buildings constructed before 2020 as well resulting in substantial reduction in energy use for all building types and ages. DOE/BT's Emerging Technologies (ET) team is working to support this strategic goal by identifying and developing advanced heating, ventilating, air-conditioning, and water heating (HVAC/WH) technology options applicable to NZEHs. In FY05 ORNL conducted an initial Stage 1 (Applied Research) scoping assessment of HVAC/WH systems options for future NZEHs to help DOE/BT identify and prioritize alternative approaches for further development. Eleven system concepts with central air distribution ducting and nine multi-zone systems were selected and their annual and peak demand performance estimated for five locations: Atlanta (mixed-humid), Houston (hot-humid), Phoenix (hot-dry), San Francisco (marine), and Chicago (cold). Performance was estimated by simulating the systems using the TRNSYS simulation engine (Solar Energy Laboratory et al. 2006) in two 1800-ft{sup 2} houses--a Building America (BA) benchmark house and a prototype NZEH taken from BEopt results at the take-off (or crossover) point (i.e., a house incorporating those design features such that further progress towards ZEH is through the addition of photovoltaic power sources, as determined by current BEopt analyses conducted by NREL). Results were summarized in a project report, HVAC Equipment Design options for Near-Zero-Energy Homes--A Stage 2 Scoping Assessment, ORNL/TM-2005/194 (Baxter 2005). The 2005 study report describes the HVAC options considered, the ranking criteria used, and the system rankings by priority. In 2006, the two top-ranked options from the 2005 study, air-source and ground-source versions of a centrally ducted integrated heat pump (IHP) system, were subjected to an initial business case study. The IHPs were subjected to a more rigorous hourly-based assessment of their performance potential compared to a baseline suite of equipment of legally minimum efficiency that provided the same heating, cooling, water heating, demand dehumidification, and ventilation services as the IHPs. Results were summarized in a project report, Initial Business Case Analysis of Two Integrated Heat Pump HVAC Systems for Near-Zero-Energy Homes, ORNL/TM-2006/130 (Baxter 2006a). The present report is an update to that document which summarizes results of an analysis of the impact of adding a humidifier to the HVAC system to maintain minimum levels of space relative humidity (RH) in winter. The space RH in winter has direct impact on occupant comfort and on control of dust mites, many types of disease bacteria, and 'dry air' electric shocks. Chapter 8 in ASHRAE's 2005 Handbook of Fundamentals (HOF) suggests a 30% lower limit on RH for indoor temperatures in the range of {approx}68-69F based on comfort (ASHRAE 2005). Table 3 in chapter 9 of the same reference suggests a 30-55% RH range for winter as established by a Canadian study of exposure limits for residential indoor environments (EHD 1987). Harriman, et al (2001) note that for RH levels of 35% or higher, electrostatic shocks are minimized and that dust mites cannot live at RH levels below 40%. They also indicate that many disease bacteria life spans are minimized when space RH is held within a 30-60% range. From the foregoing it is reasonable to assume that a winter space RH range of 30-40% would be an acceptable compromise between comfort considerations and limitation of growth rates for dust mites and many bacteria. In addition it reports som

  20. Identifying Models of HVAC Systems Using Semiparametric Regression Anil Aswani, Neal Master, Jay Taneja, Virginia Smith, Andrew Krioukov, David Culler, and Claire Tomlin

    E-Print Network [OSTI]

    McAuliffe, Jon

    , and air-conditioning (HVAC) systems use a large amount of energy, and so they are an interesting area models that incorporate such nonlinearities. I. INTRODUCTION Heating, ventilation, and air-conditioning for efficiency improvements. The focus here is on the use of semiparametric regression to identify models, which

  1. CALIFORNIA ENERGY Large HVAC Building

    E-Print Network [OSTI]

    CALIFORNIA ENERGY COMMISSION Large HVAC Building Survey Information Database of Buildings over 100 Energy Systems: Productivity and Building Science Program. This program was funded by the California of Portland Energy Conservation, Inc. Project Management: Cathy Higgins, Program Director for New Buildings

  2. Research and Development Roadmap for Emerging HVAC Technologies

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

    that focus on systems-level approach to HVAC sizingdesign 2 Develop an open-source building automation system to drive innovation 1 Develop optimized components for...

  3. Interdisciplinary Innovation and Vision in the HVAC 

    E-Print Network [OSTI]

    Hecker, T.

    2008-01-01

    potentials for optimizing costs can be found in the HVAC systems when calculated over the total Life-Cycle-Cost (LCC) of a building incorporating planning through to facility management. This requires an accurate plan specifying an efficient technical...

  4. Proposal for the award of a contract for the design, supply, installation and commissioning of a Heating Ventilation and Air Conditioning (HVAC) system for the HIE-ISOLDE infrastructure

    E-Print Network [OSTI]

    2012-01-01

    Proposal for the award of a contract for the design, supply, installation and commissioning of a Heating Ventilation and Air Conditioning (HVAC) system for the HIE-ISOLDE infrastructure

  5. Compression effects on pressure loss in flexible HVAC ducts

    E-Print Network [OSTI]

    Abushakra, Bass; Walker, Iain S.; Sherman, Max H.

    2002-01-01

    Flow Resistance of HVAC Air Ducts and Fittings. American= pitch of the flexible duct (longitudinal distance between49700. ACCA. 1995. Residential Duct Systems. Manual D. Air

  6. Initial Business Case Analysis of Two Integrated Heat Pump HVAC Systems for Near-Zero-Energy Homes -- Update to Include Analyses of an Economizer Option and Alternative Winter Water Heating Control Option

    SciTech Connect (OSTI)

    Baxter, Van D

    2006-12-01

    The long range strategic goal of the Department of Energy's Building Technologies (DOE/BT) Program is to create, by 2020, technologies and design approaches that enable the construction of net-zero energy homes at low incremental cost (DOE/BT 2005). A net zero energy home (NZEH) is a residential building with greatly reduced needs for energy through efficiency gains, with the balance of energy needs supplied by renewable technologies. While initially focused on new construction, these technologies and design approaches are intended to have application to buildings constructed before 2020 as well resulting in substantial reduction in energy use for all building types and ages. DOE/BT's Emerging Technologies (ET) team is working to support this strategic goal by identifying and developing advanced heating, ventilating, air-conditioning, and water heating (HVAC/WH) technology options applicable to NZEHs. Although the energy efficiency of heating, ventilating, and air-conditioning (HVAC) equipment has increased substantially in recent years, new approaches are needed to continue this trend. Dramatic efficiency improvements are necessary to enable progress toward the NZEH goals, and will require a radical rethinking of opportunities to improve system performance. The large reductions in HVAC energy consumption necessary to support the NZEH goals require a systems-oriented analysis approach that characterizes each element of energy consumption, identifies alternatives, and determines the most cost-effective combination of options. In particular, HVAC equipment must be developed that addresses the range of special needs of NZEH applications in the areas of reduced HVAC and water heating energy use, humidity control, ventilation, uniform comfort, and ease of zoning. In FY05 ORNL conducted an initial Stage 1 (Applied Research) scoping assessment of HVAC/WH systems options for future NZEHs to help DOE/BT identify and prioritize alternative approaches for further development. Eleven system concepts with central air distribution ducting and nine multi-zone systems were selected and their annual and peak demand performance estimated for five locations: Atlanta (mixed-humid), Houston (hot-humid), Phoenix (hot-dry), San Francisco (marine), and Chicago (cold). Performance was estimated by simulating the systems using the TRNSYS simulation engine (Solar Energy Laboratory et al. 2006) in two 1800-ft{sup 2} houses--a Building America (BA) benchmark house and a prototype NZEH taken from BEopt results at the take-off (or crossover) point (i.e., a house incorporating those design features such that further progress towards ZEH is through the addition of photovoltaic power sources, as determined by current BEopt analyses conducted by NREL). Results were summarized in a project report, HVAC Equipment Design options for Near-Zero-Energy Homes--A Stage 2 Scoping Assessment, ORNL/TM-2005/194 (Baxter 2005). The 2005 study report describes the HVAC options considered, the ranking criteria used, and the system rankings by priority. In 2006, the two top-ranked options from the 2005 study, air-source and ground-source versions of an integrated heat pump (IHP) system, were subjected to an initial business case study. The IHPs were subjected to a more rigorous hourly-based assessment of their performance potential compared to a baseline suite of equipment of legally minimum efficiency that provided the same heating, cooling, water heating, demand dehumidification, and ventilation services as the IHPs. Results were summarized in a project report, Initial Business Case Analysis of Two Integrated Heat Pump HVAC Systems for Near-Zero-Energy Homes, ORNL/TM-2006/130 (Baxter 2006). The present report is an update to that document. Its primary purpose is to summarize results of an analysis of the potential of adding an outdoor air economizer operating mode to the IHPs to take advantage of free cooling (using outdoor air to cool the house) whenever possible. In addition it provides some additional detail for an alternative winter water heating/space heating (WH/S

  7. Occupancy Based Demand Response HVAC Control Strategy Varick L. Erickson

    E-Print Network [OSTI]

    Cerpa, Alberto E.

    Occupancy Based Demand Response HVAC Control Strategy Varick L. Erickson University of California an efficient demand response HVAC control strategy, actual room usage must be considered. Temperature and CO2 are used for simulations but not for predictive demand response strategies. In this paper, we develop

  8. Flexibility of Commercial Building HVAC Fan as Ancillary Service for Smart Grid

    E-Print Network [OSTI]

    Maasoumy, Mehdi

    2013-01-01

    Efficient Building Control Systems, Smart Grid and AircraftCommercial Building HVAC Fan as Ancillary Service for Smart

  9. Modeling and Optimal Control Algorithm Design for HVAC Systems in Energy Efficient Buildings

    E-Print Network [OSTI]

    Maasoumy, Mehdi

    2014-01-01

    Litz. Simulation of thermal building behaviour in modelica.of the 2nd International Modelica Conference, volume 154.building behaviour using Modelica. Mathematical and Computer

  10. Co-design of Control Algorithm and Embedded Platformfor Building HVAC Systems

    E-Print Network [OSTI]

    Maasoumy, Mehdi; Zhu, Qi; Li, Cheng; Meggers, Forrest; Sangiovanni-Vincentelli, Alberto

    2013-01-01

    A design flow for building automation and control systems,”Development of building automation and control systems,”systems as part of a Building Automation System (BAS). The

  11. Sentinel: Occupancy Based HVAC Actuation using Existing WiFi Infrastructure within Commercial Buildings

    E-Print Network [OSTI]

    Gupta, Rajesh

    , Control Keywords Sentinel, HVAC, occupancy, buildings, energy efficiency 1. INTRODUCTION Commercial.00. As a result, improving the energy-efficiency of building HVAC systems is key from both a cost saving

  12. Wireless Infrastructure for Performing Monitoring, Diagnostics, and Control HVAC and Other Energy-Using Systems in Small Commercial Buildings

    SciTech Connect (OSTI)

    Patrick O'Neill

    2009-06-30

    This project focused on developing a low-cost wireless infrastructure for monitoring, diagnosing, and controlling building systems and equipment. End users receive information via the Internet and need only a web browser and Internet connection. The system used wireless communications for: (1) collecting data centrally on site from many wireless sensors installed on building equipment, (2) transmitting control signals to actuators and (3) transmitting data to an offsite network operations center where it is processed and made available to clients on the Web (see Figure 1). Although this wireless infrastructure can be applied to any building system, it was tested on two representative applications: (1) monitoring and diagnostics for packaged rooftop HVAC units used widely on small commercial buildings and (2) continuous diagnosis and control of scheduling errors such as lights and equipment left on during unoccupied hours. This project developed a generic infrastructure for performance monitoring, diagnostics, and control, applicable to a broad range of building systems and equipment, but targeted specifically to small to medium commercial buildings (an underserved market segment). The proposed solution is based on two wireless technologies. The first, wireless telemetry, is used for cell phones and paging and is reliable and widely available. This risk proved to be easily managed during the project. The second technology is on-site wireless communication for acquiring data from sensors and transmitting control signals. The technology must enable communication with many nodes, overcome physical obstructions, operate in environments with other electrical equipment, support operation with on-board power (instead of line power) for some applications, operate at low transmission power in license-free radio bands, and be low cost. We proposed wireless mesh networking to meet these needs. This technology is relatively new and has been applied only in research and tests. This proved to be a major challenge for the project and was ultimately abandoned in favor of a directly wired solution for collecting sensor data at the building. The primary reason for this was the relatively short ranges at which we were able to effectively place the sensor nodes from the central receiving unit. Several different mesh technologies were attempted with similar results. Two hardware devices were created during the original performance period of the project. The first device, the WEB-MC, is a master control unit that has two radios, a CPU, memory, and serves as the central communications device for the WEB-MC System (Currently called the 'BEST Wireless HVAC Maintenance System' as a tentative commercial product name). The WEB-MC communicates with the local mesh network system via one of its antennas. Communication with the mesh network enables the WEB-MC to configure the network, send/receive data from individual motes, and serves as the primary mechanism for collecting sensor data at remote locations. The second antenna enables the WEB-MC to connect to a cellular network ('Long-Haul Communications') to transfer data to and from the NorthWrite Network Operations Center (NOC). A third 'all-in-one' hardware solution was created after the project was extended (Phase 2) and additional resources were provided. The project team leveraged a project funded by the State of Washington to develop a hardware solution that integrated the functionality of the original two devices. The primary reason for this approach was to eliminate the mesh network technical difficulties that severely limited the functionality of the original hardware approach. There were five separate software developments required to deliver the functionality needed for this project. These include the Data Server (or Network Operations Center), Web Application, Diagnostic Software, WEB-MC Embedded Software, Mote Embedded Software. Each of these developments was necessarily dependent on the others. This resulted in a challenging management task - requiring high bandwidth communications among

  13. Analysis of the Design of an HVAC System in a Public Building 

    E-Print Network [OSTI]

    Wei, P.; Shao, Z.; Chen, H.

    2006-01-01

    Based on an example of the design of air conditioning system for a public building, this paper analyzes the characteristics of similar buildings, and introduces the air conditioning system, ventilating system, and the fire control system...

  14. Deposition of biological aerosols on HVAC heat exchangers

    E-Print Network [OSTI]

    Siegel, Jeffrey; Walker, Iain

    2001-01-01

    ASHRAE IAQ ’88, pp. 10-24. Muyshondt, A. , D. Nutter, and M.contamination on HVAC coils. Muyshondt et al. (1998) discussdynamic simulations of Muyshondt et al. (1998). The current

  15. Total Quality Commissioning for HVAC Systems to Assure High Performance Throughout the Whole Life Cycle 

    E-Print Network [OSTI]

    Maisey, G.; Milestone, B.

    2005-01-01

    In this paper, life cycle cost analysis (LCCA) of waste heat operated vapour absorption air conditioning system (VARS) incorporated in a building cogeneration system is presented and discussed. The life cycle cost analysis (LCCA) based on present...

  16. Post-Retrocommissioning HVAC Operations Monitoring Using Enterprise-Wide energy Management System 

    E-Print Network [OSTI]

    Amarnani, N.; Roberts, B.; Choy, H.

    2007-01-01

    components/systems to diagnose and resolve root causes of operational deficiencies. During the implementation phase, new energy efficiency measures were installed, sequence of operations were optimized and functionally tested. System-level benchmark models...

  17. Life Cycle cost Analysis of Waste Heat Operated Absorption Cooling Systems for Building HVAC Applications 

    E-Print Network [OSTI]

    Saravanan, R.; Murugavel, V.

    2010-01-01

    In this paper, life cycle cost analysis (LCCA) of waste heat operated vapour absorption air conditioning system (VARS) incorporated in a building cogeneration system is presented and discussed. The life cycle cost analysis (LCCA) based on present...

  18. Improving efficiency of a vehicle HVAC system with comfort modeling, zonal design, and thermoelectric devices

    Office of Energy Efficiency and Renewable Energy (EERE)

    Discusses progress on thermal comfort modeling and detailed design, fabrication, and component/system-level testing of TE architecture

  19. Using Simulation Models for Building Commissioning 

    E-Print Network [OSTI]

    Claridge, D. E.

    2004-01-01

    The International Energy Agency ECBCS Annex 40 “Commissioning of Buildings and HVAC Systems for Improved Energy Performance” task investigating Use of Whole Building Simulation in Commissioning has identified the following applications of whole...

  20. Commissioning of Building HVAC Systems for Improved Energy Performance: A Summary of Annex 40 Results 

    E-Print Network [OSTI]

    Visier, J. C.

    2004-01-01

    main achievements. These achievements can be split in 4 categories: 1) tools to manage the commissioning process, 2) manual commissioning tools, 3) approaches to use building energy management system to assist in building commissioning, 4) approaches...

  1. FAULT DETECTION IN HVAC SYSTEMS USING MODEL-BASED FEEDFORWARD CONTROL

    E-Print Network [OSTI]

    operating conditions change. Poor control performance can lead to occupant discomfort in the treated the process it is controlling. Faults that lead to performance deterioration, or a change in system behavior. The model used in the feedforward controller acts as a baseline of correct behavior, and facilitates

  2. Re-Commissioning of the CAMET HVAC System: A Successful Case Study 

    E-Print Network [OSTI]

    Andre, P.; Cuevas, C.; Lacote, P.; Lebrun, J.

    2003-01-01

    conditioning system. Focus is given here to the so-called “recommissioning” and the proposed principles are illustrated by reference to a specific case study: the “CAMET” building. The "CA-MET" is a new ministry office building, designed for an occupancy...

  3. Methodology to Analyze the Sensitivity of Building Energy Consumption to HVAC System Sensor Error 

    E-Print Network [OSTI]

    Ma, Liang

    2012-02-14

    (MIL-HDBK-338B, 2008). The report entitled ?Failure Mode/Mechanism Distribution 1997? offers abundant failure mode data defined alternatively for equipment, actuators, etc. In this report, short, open and drift are all considered failure modes..., 2010). The least common failure mode is the shorted circuit, which comprises 15% of thermistor failures. The Electronic Reliability Design Handbook (MIL-HDBK-338B, 2008) uses a different classification system for thermistor failure modes classifying...

  4. Grundfos HVAC OEM Efficient water hydraulics

    E-Print Network [OSTI]

    Oak Ridge National Laboratory

    .7 mio. integrated water circuits are running already in boiler systems . Efficient water hydraulics HVAC complexity ·20 years of experience in hydraulics for the Boiler System industry. ·Key success factor is our of boiler capacity the flow requirements for heat pumps are up to 4 times bigger. With UPML GEO we

  5. Origins of Analysis Methods in Energy Simulation Programs Used for High Performance Commercial Buildings 

    E-Print Network [OSTI]

    Oh, Sukjoon

    2013-08-19

    Current designs of high performance buildings utilize hourly building energy simulations of complex, interacting systems. Such simulations need to quantify the benefits of numerous features including: thermal mass, HVAC ...

  6. Air-Side Energy Use Calculations for Four HVAC Systems: Dual Duct Constant Volume (DDCAV), Dual Duct Variable Volume (DDVAV), Constant Volume with Reheat (CAVRH), Variable Volume with Reheat (VAVRH), Four Pipe Fan Coil Unit (FC), Four Pipe Induction Unit (FI), and Single Zone (SZ) Systems, Revised June 2002 

    E-Print Network [OSTI]

    Haberl, J. S.; Bou-Saada, T. E.; Saman, N. F.

    2001-01-01

    This report contains engineering calculations for seven (7) air-side, heating, ventilating and air conditioning systems (HVAC) systems, including: dual duct constant volume (DDCAV), dual duct variable volume (DDVAV), ...

  7. Model Predictive Control of HVAC Systems: Implementation and Testing at the University of California, Merced

    SciTech Connect (OSTI)

    Haves, Phillip; Hencey, Brandon; Borrell, Francesco; Elliot, John; Ma, Yudong; Coffey, Brian; Bengea, Sorin; Wetter, Michael

    2010-06-29

    A Model Predictive Control algorithm was developed for the UC Merced campus chilled water plant. Model predictive control (MPC) is an advanced control technology that has proven successful in the chemical process industry and other industries. The main goal of the research was to demonstrate the practical and commercial viability of MPC for optimization of building energy systems. The control algorithms were developed and implemented in MATLAB, allowing for rapid development, performance, and robustness assessment. The UC Merced chilled water plant includes three water-cooled chillers and a two million gallon chilled water storage tank. The tank is charged during the night to minimize on-peak electricity consumption and take advantage of the lower ambient wet bulb temperature. The control algorithms determined the optimal chilled water plant operation including chilled water supply (CHWS) temperature set-point, condenser water supply (CWS) temperature set-point and the charging start and stop times to minimize a cost function that includes energy consumption and peak electrical demand over a 3-day prediction horizon. A detailed model of the chilled water plant and simplified models of the buildings served by the plant were developed using the equation-based modeling language Modelica. Steady state models of the chillers, cooling towers and pumps were developed, based on manufacturers performance data, and calibrated using measured data collected and archived by the control system. A detailed dynamic model of the chilled water storage tank was also developed and calibrated. Simple, semi-empirical models were developed to predict the temperature and flow rate of the chilled water returning to the plant from the buildings. These models were then combined and simplified for use in a model predictive control algorithm that determines the optimal chiller start and stop times and set-points for the condenser water temperature and the chilled water supply temperature. The report describes the development and testing of the algorithm and evaluates the resulting performance, concluding with a discussion of next steps in further research. The experimental results show a small improvement in COP over the baseline policy but it is difficult to draw any strong conclusions about the energy savings potential for MPC with this system only four days of suitable experimental data were obtained once correct operation of the MPC system had been achieved. These data show an improvement in COP of 3.1% {+-} 2.2% relative to a baseline established immediately prior to the period when the MPC was run in its final form. This baseline includes control policy improvements that the plant operators learned by observing the earlier implementations of MPC, including increasing the temperature of the water supplied to the chiller condensers from the cooling towers. The process of data collection and model development, necessary for any MPC project, resulted in the team uncovering various problems with the chilled water system. Although it is difficult to quantify the energy savings resulting from these problems being remedied, they were likely on the same order as the energy savings from the MPC itself. Although the types of problems uncovered and the level of energy savings may differ significantly from other projects, some of the benefits of detecting and diagnosing problems are expected from the use of MPC for any chilled water plant. The degree of chiller loading was found to be a key factor for efficiency. It is more efficient to operate the chillers at or near full load. In order to maximize the chiller load, one would maximize the temperature difference across chillers and the chilled water flow rate through the chillers. Thus, the CHWS set-point and the chilled water flow-rate can be used to limit the chiller loading to prevent chiller surging. Since the flow rate has an upper bound and the CHWS set point has a lower bound, the chiller loading is constrained and often determined by the chilled water return temperature (CHWR). The CHWR temperature

  8. Comparative Study of Availability on Energy/Environment Commissioning Using Existing HVAC Simulation Programs for a Model Building 

    E-Print Network [OSTI]

    Niwa, H.; Nakahara, N.; Okumiya, M.; Suganaga, M.; Tanaka, H.; Pan, S.; Watanabe, T.; Zheng, M.

    2004-01-01

    limit of VAV air flow rate: 50% of minimum ? Heat Source System: Thermal storage system using AHP(Air-soure HeatPumps) ? Performance characteristics of fan, pump, heat pump are defined as manufacturer's ? Internal heat gain schedules are set...

  9. Advanced control strategies for HVAC&R systems—An overview: Part II: Soft and fusion control

    SciTech Connect (OSTI)

    D. Subbaram Naidu; Craig G. Rieger

    2011-04-01

    A chronological overview of the advanced control strategies for HVAC&R is presented. The overview focuses on hard-computing or control techniques, such as proportional-integral-derivative, optimal, nonlinear, adaptive, and robust; soft-computing or control techniques, such as neural networks, fuzzy logic, genetic algorithms; and the fusion or hybrid of hard and soft control techniques. Part I focused on hardcontrol strategies; Part II focuses on soft and fusion control and some future directions in HVA&R research. This overview is not intended to be an exhaustive survey on this topic, and any omissions of other works is purely unintentional.

  10. VOLUME 11, NUMBER 4 HVAC&R RESEARCH OCTOBER 2005 A Model for Annual Simulation of Standing

    E-Print Network [OSTI]

    be used as highly efficient ground heat exchangers in geothermal heat pump systems. This paper describes been in use in limited numbers since the advent of geothermal heat pump systems but are recently wells. An approach that uti- lizes an "enhanced" thermal conductivity to account for the natural

  11. A Runtime Verification Framework for Control System Simulation

    SciTech Connect (OSTI)

    Ciraci, Selim; Fuller, Jason C.; Daily, Jeffrey A.; Makhmalbaf, Atefe; Callahan, Charles D.

    2014-08-02

    n a standard workflow for the validation of a control system, the control system is implemented as an extension to a simulator. Such simulators are complex software systems, and engineers may unknowingly violate constraints a simulator places on extensions. As such, errors may be introduced in the implementation of either the control system or the simulator leading to invalid simulation results. This paper presents a novel runtime verification approach for verifying control system implementations within simulators. The major contribution of the approach is the two-tier specification process. In the first tier, engineers model constraints using a domain-specific language tailored to modeling a controller’s response to changes in its input. The language is high-level and effectively hides the implementation details of the simulator, allowing engineers to specify design-level constraints independent of low-level simulator interfaces. In the second tier, simulator developers provide mapping rules for mapping design-level constraints to the implementation of the simulator. Using the rules, an automated tool transforms the design-level specifications into simulator-specific runtime verification specifications and generates monitoring code which is injected into the implementation of the simulator. During simulation, these monitors observe the input and output variables of the control system and report changes to the verifier. The verifier checks whether these changes follow the constraints of the control system. We describe application of this approach to the verification of the constraints of an HVAC control system implemented with the power grid simulator GridLAB-D.

  12. Demonstration of HVAC chiller control for power grid frequency regulation

    E-Print Network [OSTI]

    Su, Po-An (Po-An Leo)

    2015-01-01

    Secondary frequency regulation is a necessary electric grid ancillary service that balances electric power system supply and demand on short time intervals of seconds to minutes. Commercial HVAC chillers may be well ...

  13. Automotive Thermoelectric Generators and HVAC | Department of...

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

    Generators and HVAC Automotive Thermoelectric Generators and HVAC Provides overview of DOE-supported projects in automotive thermoelectric generators and heatersair conditioners...

  14. The Impact of Uncertain Physical Parameters on HVAC Demand Response

    SciTech Connect (OSTI)

    Sun, Yannan; Elizondo, Marcelo A.; Lu, Shuai; Fuller, Jason C.

    2014-03-01

    HVAC units are currently one of the major resources providing demand response (DR) in residential buildings. Models of HVAC with DR function can improve understanding of its impact on power system operations and facilitate the deployment of DR technologies. This paper investigates the importance of various physical parameters and their distributions to the HVAC response to DR signals, which is a key step to the construction of HVAC models for a population of units with insufficient data. These parameters include the size of floors, insulation efficiency, the amount of solid mass in the house, and efficiency of the HVAC units. These parameters are usually assumed to follow Gaussian or Uniform distributions. We study the effect of uncertainty in the chosen parameter distributions on the aggregate HVAC response to DR signals, during transient phase and in steady state. We use a quasi-Monte Carlo sampling method with linear regression and Prony analysis to evaluate sensitivity of DR output to the uncertainty in the distribution parameters. The significance ranking on the uncertainty sources is given for future guidance in the modeling of HVAC demand response.

  15. A New Model to Simulate Energy Performance of VRF Systems

    SciTech Connect (OSTI)

    Hong, Tianzhen; Pang, Xiufeng; Schetrit, Oren; Wang, Liping; Kasahara, Shinichi; Yura, Yoshinori; Hinokuma, Ryohei

    2014-03-30

    This paper presents a new model to simulate energy performance of variable refrigerant flow (VRF) systems in heat pump operation mode (either cooling or heating is provided but not simultaneously). The main improvement of the new model is the introduction of the evaporating and condensing temperature in the indoor and outdoor unit capacity modifier functions. The independent variables in the capacity modifier functions of the existing VRF model in EnergyPlus are mainly room wet-bulb temperature and outdoor dry-bulb temperature in cooling mode and room dry-bulb temperature and outdoor wet-bulb temperature in heating mode. The new approach allows compliance with different specifications of each indoor unit so that the modeling accuracy is improved. The new VRF model was implemented in a custom version of EnergyPlus 7.2. This paper first describes the algorithm for the new VRF model, which is then used to simulate the energy performance of a VRF system in a Prototype House in California that complies with the requirements of Title 24 ? the California Building Energy Efficiency Standards. The VRF system performance is then compared with three other types of HVAC systems: the Title 24-2005 Baseline system, the traditional High Efficiency system, and the EnergyStar Heat Pump system in three typical California climates: Sunnyvale, Pasadena and Fresno. Calculated energy savings from the VRF systems are significant. The HVAC site energy savings range from 51 to 85percent, while the TDV (Time Dependent Valuation) energy savings range from 31 to 66percent compared to the Title 24 Baseline Systems across the three climates. The largest energy savings are in Fresno climate followed by Sunnyvale and Pasadena. The paper discusses various characteristics of the VRF systems contributing to the energy savings. It should be noted that these savings are calculated using the Title 24 prototype House D under standard operating conditions. Actual performance of the VRF systems for real houses under real operating conditions will vary.

  16. System-of-Systems Approach for Integrated Energy Systems Modeling and Simulation: Preprint

    SciTech Connect (OSTI)

    Mittal, Saurabh; Ruth, Mark; Pratt, Annabelle; Lunacek, Monte; Krishnamurthy, Dheepak; Jones, Wesley

    2015-08-21

    Today’s electricity grid is the most complex system ever built—and the future grid is likely to be even more complex because it will incorporate distributed energy resources (DERs) such as wind, solar, and various other sources of generation and energy storage. The complexity is further augmented by the possible evolution to new retail market structures that provide incentives to owners of DERs to support the grid. To understand and test new retail market structures and technologies such as DERs, demand-response equipment, and energy management systems while providing reliable electricity to all customers, an Integrated Energy System Model (IESM) is being developed at NREL. The IESM is composed of a power flow simulator (GridLAB-D), home energy management systems implemented using GAMS/Pyomo, a market layer, and hardware-in-the-loop simulation (testing appliances such as HVAC, dishwasher, etc.). The IESM is a system-of-systems (SoS) simulator wherein the constituent systems are brought together in a virtual testbed. We will describe an SoS approach for developing a distributed simulation environment. We will elaborate on the methodology and the control mechanisms used in the co-simulation illustrated by a case study.

  17. HVAC Cabinet Air Leakage Test Method - Building America Top Innovation...

    Energy Savers [EERE]

    HVAC Cabinet Air Leakage Test Method - Building America Top Innovation HVAC Cabinet Air Leakage Test Method - Building America Top Innovation While HVAC installers have improved...

  18. Chapter 19: HVAC Controls (DDC/EMS/BAS) Evaluation Protocol

    SciTech Connect (OSTI)

    Romberger, J.

    2014-11-01

    The HVAC Controls Evaluation Protocol is designed to address evaluation issues for direct digital controls/energy management systems/building automation systems (DDC/EMS/BAS) that are installed to control heating, ventilation, and air-conditioning (HVAC) equipment in commercial and institutional buildings. (This chapter refers to the DDC/EMS/BAS measure as HVAC controls.) This protocol may also be applicable to industrial facilities such as clean rooms and labs, which have either significant HVAC equipment or spaces requiring special environmental conditions. This protocol addresses only HVAC-related equipment and the energy savings estimation methods associated with installing such control systems as an energy efficiency measure. The affected equipment includes: Air-side equipment (air handlers, direct expansion systems, furnaces, other heating- and cooling-related devices, terminal air distribution equipment, and fans); Central plant equipment (chillers, cooling towers, boilers, and pumps). These controls may also operate or affect other end uses, such as lighting, domestic hot water, irrigation systems, and life safety systems such as fire alarms and other security systems. Considerable nonenergy benefits, such as maintenance scheduling, system component troubleshooting, equipment failure alarms, and increased equipment lifetime, may also be associated with these systems. When connected to building utility meters, these systems can also be valuable demand-limiting control tools. However, this protocol does not evaluate any of these additional capabilities and benefits.

  19. Study of lubricant circulation in HVAC systems. Volume 1: Description of technical effort and results; Final technical report, March 1995--April 1996

    SciTech Connect (OSTI)

    Biancardi, F.R.; Michels, H.H.; Sienel, T.H.; Pandy, D.R.

    1996-10-01

    The purpose of this program was to conduct experimental and analytical efforts to determine lubricant circulation characteristics of new HFC/POE pairs and HFC/mineral oil pairs in a representative central residential HVAC system and to compare their behavior with the traditional HCFC-22/mineral oil (refrigerant/lubricant) pair. A dynamic test facility was designed and built to conduct the experimental efforts. This facility provided a unique capability to visually and physically measure oil circulation rates, on-line, in operating systems. A unique on-line ultraviolet-based measurement device was used to obtain detailed data on the rate and level of lubricant oil circulated within the operating heat pump system. The experimental and analytical data developed during the program are presented as a function of vapor velocity, refrigerant/lubricant viscosity, system features and equipment. Both visual observations and instrumentation were used to understand ``worst case`` oil circulation situations. This report is presented in two volumes. Volume 1 contains a complete description of the program scope, objective, test results summary, conclusions, description of test facility and recommendations for future effort. Volume 2 contains all of the program test data essentially as taken from the laboratory dynamic test facility during the sequence of runs.

  20. An implementation of co-simulation for performance prediction of innovative integrated HVAC systems in buildings

    E-Print Network [OSTI]

    Trcka, Marija

    2010-01-01

    DELIGHT2 daylighting analysis in EnergyPlus: Integration andflow model with the EnergyPlus Building Energy Simulationsuch tools include eQuest, EnergyPlus, DOE 2.1, IES VE, and

  1. Review of Pre- and Post-1980 Buildings in CBECS - HVAC Equipment

    SciTech Connect (OSTI)

    Winiarski, David W.; Jiang, Wei; Halverson, Mark A.

    2006-12-01

    PNNL was tasked by DOE to look at HVAC systems and equipment for Benchmark buildings based on 2003 CBECS data. This white paper summarizes the results of PNNL’s analysis of 2003 CBECS data and provides PNNL’s recommendations for HVAC systems and equipment for use in the Benchmark buildings.

  2. Multi-carrier Signal Transmission through HVAC Ducts: Experimental Results for Channel Capacity

    E-Print Network [OSTI]

    Stancil, Daniel D.

    Multi-carrier Signal Transmission through HVAC Ducts: Experimental Results for Channel Capacity) ducts based on multi-carrier transmission technique and mea- sured channel frequency responses in the 2 through a building HVAC duct system demonstrate the ability to transmit with a spectral efficiency of 3

  3. Building America Top Innovations 2014 Profile: HVAC Cabinet Air Leakage Test Method

    SciTech Connect (OSTI)

    none,

    2014-11-01

    This 2014 Top Innovation profile describes Building America-funded research by teams and national laboratories that resulted in the development of an ASHRAE standard and a standardized testing method for testing the air leakage of HVAC air handlers and furnace cabinets and has spurred equipment manufacturers to tighten the cabinets they use for residential HVAC systems.

  4. ZonePAC: Zonal Power Estimation and Control via HVAC Metering and Occupant Feedback

    E-Print Network [OSTI]

    Gupta, Rajesh

    Ventillation and Air Conditioning (HVAC) systems ac- count for nearly 40% of primary energy consumption Measurement, Human Factors, Design Keywords HVAC, Thermostat, Energy Estimation, Variable Air Volume, User buildings [2], and is one of the prime targets for improving building energy efficiency. Several studies

  5. IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 51, NO. 5, MAY 2003 945 Propagation Model for the HVAC Duct as a

    E-Print Network [OSTI]

    Hannaford, Blake

    for the HVAC Duct as a Communication Channel Pavel V. Nikitin, Member, IEEE, Daniel D. Stancil, Senior Member (HVAC) ducts in buildings are typically hollow metal pipes which can be used as waveguides to carry such a communication system. This paper presents a propagation model for a straight HVAC duct terminated at both ends

  6. Pedernales Electric Cooperative- HVAC Rebate Program

    Broader source: Energy.gov [DOE]

    Pedernales Electric Cooperative offers equipment rebates to its members who install energy efficient HVAC equipment. Eligible equipment includes:

  7. Simulating neural systems with Xyce.

    SciTech Connect (OSTI)

    Schiek, Richard Louis; Thornquist, Heidi K.; Mei, Ting; Warrender, Christina E.; Aimone, James Bradley; Teeter, Corinne; Duda, Alex M.

    2012-12-01

    Sandia's parallel circuit simulator, Xyce, can address large scale neuron simulations in a new way extending the range within which one can perform high-fidelity, multi-compartment neuron simulations. This report documents the implementation of neuron devices in Xyce, their use in simulation and analysis of neuron systems.

  8. This paper has been downloaded from the Building and Environmental Thermal Systems Research Group at Oklahoma State University (www.hvac.okstate.edu)

    E-Print Network [OSTI]

    and June 1996 on next-generation building energy simulation tools. We first describe the methods usedThis paper has been downloaded from the Building and Environmental Thermal Systems Research Group-Generation in Building Energy Simulation -- A Glimpse of the Future. Proceedings of Building Simulation '97, Vol. 3, pp

  9. Simulation of open quantum systems

    E-Print Network [OSTI]

    Florian Mintert; Eric J. Heller

    2008-03-27

    We present an approach for the semiclassical treatment of open quantum systems. An expansion into localized states allows restriction of a simulation to a fraction of the environment that is located within a predefined vicinity of the system. Adding and dropping environmental particles during the simulation yields an effective reduction of the size of the system that is being treated.

  10. Indirect Benefits (Increased Roof Life and HVAC Savings) from a Solar PV System at the San José Convention Center

    Office of Energy Efficiency and Renewable Energy (EERE)

    The City of San José is considering the installation of a solar photovoltaic (PV) system on the roof of the San José Convention Center. The installation would be on a lower section of the roof covering approximately 21,000 ft2. To assist city staff in making a decision on the PV installation, the Department of Energy Tiger Team has investigated potential indirect benefits of installing a solar PV system on the Convention Center roof. The indirect benefits include potential increase in roof life, as well as potential reduced heating and cooling load in the building due to roof shading from the PV system.

  11. Development of an Automated Fault Detection and Diagnostic Tool for Unitary HVAC Systems at Industrial Energy Audits 

    E-Print Network [OSTI]

    Parikh, Priyam

    2014-10-30

    their repair with a monetary value without the use of a quick tool. Existing methods and tools require system specific models or manufacturer’s map models that are not easily available to energy auditors. The proposed automated fault detection and diagnostic...

  12. This paper has been downloaded from the Building and Environmental Thermal Systems Research Group at Oklahoma State University (www.hvac.okstate.edu)

    E-Print Network [OSTI]

    This paper has been downloaded from the Building and Environmental Thermal Systems Research Group is modular in structure, and uses the heat balance technique to simulate building thermal loads. The Energy been made in the development of airflow models that can simulate interzone airflows and pollution

  13. This paper has been downloaded from the Building and Environmental Thermal Systems Research Group at Oklahoma State University (http://www.hvac.okstate.edu).

    E-Print Network [OSTI]

    and Validation of Ground-Source Heat Pump System Models in an Integrated Building and System Simulation and lower maintenance benefits of ground-source heat pump (GSHP) systems, little work has been undertaken Ground Source Heat Pump Laboratory have been used to validate both the heat pump and ground heat

  14. 1999 Commercial Buildings Characteristics--HVAC Conservation...

    U.S. Energy Information Administration (EIA) Indexed Site

    Center at (202) 586-8800. Energy Information Administration Commercial Buildings Energy Consumption Survey Those commercial buildings that used HVAC conservation features...

  15. Columbia Water & Light- Residential HVAC Rebates

    Broader source: Energy.gov [DOE]

    Columbia Water & Light (CWL) provides residential customers with rebates on energy efficient HVAC equipment. Customers should submit the mechanical permit from a Protective Inspection, a copy...

  16. Building America Expert Meeting: Transitioning Traditional HVAC...

    Energy Savers [EERE]

    validate the general business models for traditional HVAC companies and whole house energy upgrade companies Review preliminary findings on the differences between the structure...

  17. Energy Department Releases Roadmaps on HVAC Technologies, Water...

    Office of Environmental Management (EM)

    Energy Department Releases Roadmaps on HVAC Technologies, Water Heating, Appliances, and Low-GWP Refrigerants Energy Department Releases Roadmaps on HVAC Technologies, Water...

  18. HVAC component data modeling using industry foundation classes

    SciTech Connect (OSTI)

    Bazjanac, Vladimir; Forester, James; Haves, Philip; Sucic, Darko; Xu, Peng

    2002-07-01

    The Industry Foundation Classes (IFC) object data model of buildings is being developed by the International Alliance for Interoperability (IAI). The aim is to support data sharing and exchange in the building and construction industry across the life-cycle of a building. This paper describes a number of aspects of a major extension of the HVAC part of the IFC data model. First is the introduction of a more generic approach for handling HVAC components. This includes type information, which corresponds to catalog data, occurrence information, which defines item-specific attributes such as location and connectivity, and performance history information, which documents the actual performance of the component instance over time. Other IFC model enhancements include an extension of the connectivity model used to specify how components forming a system can be traversed and the introduction of time-based data streams. This paper includes examples of models of particular types of HVAC components, such as boilers and actuators, with all attributes included in the definitions. The paper concludes by describing the on-going process of model testing, implementation and integration into the complete IFC model and how the model can be used by software developers to support interoperability between HVAC-oriented design and analysis tools.

  19. Building and Environment 42 (2007) 203217 Model-based analysis and simulation of airflow control systems of

    E-Print Network [OSTI]

    Melnik, Roderick

    2007-01-01

    extracted from the room, and the temperature of the air exited of heat exchanger and supplied from for two different types of loading conditions. r 2005 Elsevier Ltd. All rights reserved. Keywords: HVAC, testing, operation, and management of heating, ventilation and air conditioning (HVAC) systems rely

  20. ASHRAE Transactions: Symposia 1107 The interest in both modular simulation and alternative

    E-Print Network [OSTI]

    a limited Modular HVAC Simulation and the Future Integration of Alternative Cooling Systems in a NewASHRAE Transactions: Symposia 1107 ABSTRACT The interest in both modular simulation and alternative. At the same time, the U.S. Department of Energy has released its new building energy simulation program

  1. Thermal Simulation of Advanced Powertrain Systems | Department...

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

    Simulation of Advanced Powertrain Systems Thermal Simulation of Advanced Powertrain Systems Under this project, the Volvo complete vehicle model was modified to include engine and...

  2. Quantitative Methods for Comparing Different HVAC Control Schemes

    E-Print Network [OSTI]

    Aswani, Anil; Taneja, Jay; Krioukov, Andrew; Culler, David; Tomlin, Claire

    2012-01-01

    Experimentally comparing the energy usage and comfort characteristics of different controllers in heating, ventilation, and air-conditioning (HVAC) systems is difficult because variations in weather and occupancy conditions preclude the possibility of establishing equivalent experimental conditions across the order of hours, days, and weeks. This paper is concerned with defining quantitative metrics of energy usage and occupant comfort, which can be computed and compared in a rigorous manner that is capable of determining whether differences between controllers are statistically significant in the presence of such environmental fluctuations. Experimental case studies are presented that compare two alternative controllers (a schedule controller and a hybrid system learning-based model predictive controller) to the default controller in a building-wide HVAC system. Lastly, we discuss how our proposed methodology may also be able to quantify the efficiency of other building automation systems.

  3. RIGOROUS MODELING AND SIMULATION OF MECHATRONIC SYSTEMS

    E-Print Network [OSTI]

    Taylor, James H.

    RIGOROUS MODELING AND SIMULATION OF MECHATRONIC SYSTEMS James H. Taylor Professor Emeritus, Systems on mechatronic systems. Emphasis is placed on rigorous techniques and selecting the most appropriate method mentioned above for mechatronic systems. Key Words: Mechatronic systems, modeling, simulation, numerical

  4. Realt-Time Building Occupancy Sensing for Supporting Demand Driven HVAC Operations 

    E-Print Network [OSTI]

    Ekwevugbe, T.; Brown, N.; Pakka, V.

    2013-01-01

    use. Previous research have proposed up to 56% HVAC related energy savings with improvements in operation and management of HVAC systems (Sun et al., 2011, Tachwali et al., 2007). Real- time building occupancy sensing is useful for efficient.... The area enjoys good natural lighting due to its large side windows, although it is shaded from the direct effect of the sun by an adjacent part of the building. It is ventilated with three glazed roof vents. The vents are controlled together by room...

  5. Study on Control Performance of HVAC System or Interior Zone and Perimeter Zone in Office Building; Estimation of Optimal PI Tuning in Cooling Operation 

    E-Print Network [OSTI]

    Maehara, K.; Sagara, N.

    2007-01-01

    of not being able to satisfy the requirements of room temperature control during the cooling period in summer, an optimal PID parameter (O-PI) is selected through simulation of its two feedback control systems with mutual influence using the models identified...

  6. SIMMODEL: A DOMAIN DATA MODEL FOR WHOLE BUILDING ENERGY SIMULATION

    E-Print Network [OSTI]

    O'Donnell, James

    2013-01-01

    whole building energy simulation program. In: IBPSA BuildingExchange Protocols for Energy Simulation of HVAC&R EquipmentInteroperability for Energy Simulation. buildingSmart (2010)

  7. Higher Efficiency HVAC Motors | Department of Energy

    Broader source: Energy.gov (indexed) [DOE]

    and the world leader in HVAC and refrigeration solutions. QM Power's Parallel Path Magnetic Technology(tm) (PPMT(tm)) uses permanent magnets in a novel yet simple magnetic...

  8. Predicting particle deposition on HVAC heat exchangers

    E-Print Network [OSTI]

    Siegel, J A; Nazaroff, William W

    2003-01-01

    Processing 75 (1), 121-127. Muyshondt, A. , Nutter, D. ,Bott and Bemrose, 1983; Muyshondt et al. , 1998). However,HVAC heat exchanger fouling (Muyshondt et al. , 1998). It is

  9. Better Buildings Neighborhood Program Business Models Guide: HVAC Contractor Business Model Conclusion

    Broader source: Energy.gov [DOE]

    Better Buildings Neighborhood Program Business Models Guide: HVAC Contractor Business Model Conclusion, Summary of HVAC Contractor Insights.

  10. Recovery act. Development of design and simulation tool for hybrid geothermal heat pump system

    SciTech Connect (OSTI)

    Wang, Shaojie; Ellis, Dan

    2014-05-29

    The ground source heat pump (GSHP) system is one of the most energy efficient HVAC technologies in the current market. However, the heat imbalance may degrade the ability of the ground loop heat exchanger (GLHX) to absorb or reject heat. The hybrid GSHP system, which combines a geothermal well field with a supplemental boiler or cooling tower, can balance the loads imposed on the ground loop heat exchangers to minimize its size while retaining superior energy efficiency. This paper presents a recent simulation-based study with an intention to compare multiple common control strategies used in hybrid GSHP systems, including fixed setpoint, outside air reset, load reset, and wetbulb reset. A small office in Oklahoma City conditioned by a hybrid GSHP system was simulated with the latest version of eQUEST 3.7[1]. The simulation results reveal that the hybrid GSHP system has the excellent capability to meet the cooling and heating setpoints during the occupied hours, balance thermal loads on the ground loop, as well as improve the thermal comfort of the occupants with the undersized well field.

  11. Computer Simulations of charged systems

    E-Print Network [OSTI]

    C. Holm; K. Kremer

    2002-03-26

    In this brief contribution to the Proceedings of the NATO-ASI on ``Electrostatic Effects in Soft Matter and Biophysics'', which took place in Les Houches from Oct. 1-13, 2000, we summarize in short aspects of the simulations methods to study charged systems. After describing some basics of Monte Carlo and Molecular dynamics techniques, we describe a few methods to compute long range interactions in periodic systems. After a brief detour to mean-field models, we describe our results obtained for flexible polyelectrolytes in good and bad solvents. We follow with a description of the inhomogeneity of the counterion distribution around finite chains, and continue then with infinitely long, rodlike systems. The last part is devoted to the phenomenon of overcharging for colloidal particles and its explanation in terms of simple electrostatic arguments.

  12. VARIABLE SPEED INTEGRATED INTELLIGENT HVAC BLOWER

    SciTech Connect (OSTI)

    Shixiao Wang; Herman Wiegman; Wilson Wu; John Down; Luana Iorio; Asha Devarajan; Jing Wang; Ralph Carl; Charlie Stephens; Jeannine Jones; Paul Szczesny

    2001-11-14

    This comprehensive topical report discusses the key findings in the development of a intelligent integrated blower for HVAC applications. The benefits of rearward inclined blades over that of traditional forward inclined blades is well documented and a prototype blower design is presented. A comparison of the proposed blower to that of three typical units from the industry is presented. The design of the blower housing is also addressed and the impact of size limitations on static efficiency is discussed. Issues of air flow controllability in the rearward inclined blower is addressed and a solution to this problem is proposed. Several motor design options are discussed including inside-out radial flux designs and novel axial flux designs, all are focused on the various blower needs. The control of the motor-blower and airflow through the use of a high density inverter stage and modern digital signal processor is presented. The key technical challenges of the approach are discussed. The use of the motor as a sensor in the larger heating/ventilating system is also discussed. Diagnostic results for both the motor itself and the blower system are presented.

  13. This paper has been downloaded from the Building and Environmental Thermal Systems Research Group at Oklahoma State University (www.hvac.okstate.edu)

    E-Print Network [OSTI]

    .J. Huang, A.E. Erdem. ENERGYPLUS, A New-Generation Building Energy Simulation Program. Proceedings of Building Simulation '99, Volume 1: 81-88. #12;1 ENERGYPLUS, A NEW-GENERATION BUILDING ENERGY SIMULATION simulation tool, EnergyPlus, building on the capabilities and features of BLAST and DOE-2. This paper focuses

  14. Cooling and Dehumidification HVAC Technology for 1990s

    E-Print Network [OSTI]

    Oak Ridge National Laboratory

    Desiccant Cooling and Dehumidification HVAC Technology for 1990s HVAC: Heating, Ventilation, and Air Conditioning Desiccant Cooling Group Solar Energy Research Institute Golden, Colorado #12;Table of Contents * Background and Fundamentals * SERI Desiccant Research * Status of Desiccant Technology * Future

  15. Co-Simulation of Detailed Whole Building with the Power System to Study Smart Grid Applications

    SciTech Connect (OSTI)

    Makhmalbaf, Atefe; Fuller, Jason C.; Srivastava, Viraj; Ciraci, Selim; Daily, Jeffrey A.

    2014-12-24

    Modernization of the power system in a way that ensures a sustainable energy system is arguably one of the most pressing concerns of our time. Buildings are important components in the power system. First, they are the main consumers of electricity and secondly, they do not have constant energy demand. Conventionally, electricity has been difficult to store and should be consumed as it is generated. Therefore, maintaining the demand and supply is critical in the power system. However, to reduce the complexity of power models, buildings (i.e., end-use loads) are traditionally modeled and represented as aggregated “dumb” nodes in the power system. This means we lack effective detailed whole building energy models that can support requirements and emerging technologies of the smart power grid. To gain greater insight into the relationship between building energy demand and power system performance, it is important to constitute a co-simulation framework to support detailed building energy modeling and simulation within the power system to study capabilities promised by the modern power grid. This paper discusses ongoing work at Pacific Northwest National Laboratory and presents underlying tools and framework needed to enable co-simulation of building, building energy systems and their control in the power system to study applications such as demand response, grid-based HVAC control, and deployment of buildings for ancillary services. The optimal goal is to develop an integrated modeling and simulation platform that is flexible, reusable, and scalable. Results of this work will contribute to future building and power system studies, especially those related to the integrated ‘smart grid’. Results are also expected to advance power resiliency and local (micro) scale grid studies where several building and renewable energy systems transact energy directly. This paper also reviews some applications that can be supported and studied using the framework introduced to understand their implications before they can be successfully implemented in the power system.

  16. Low Energy Quantum System Simulation

    E-Print Network [OSTI]

    Peter Cho; Karl Berggren

    2003-10-26

    A numerical method for solving Schrodinger's equation based upon a Baker-Campbell-Hausdorff (BCH) expansion of the time evolution operator is presented herein. The technique manifestly preserves wavefunction norm, and it can be applied to problems in any number of spatial dimensions. We also identify a particular dimensionless ratio of potential to kinetic energies as a key coupling constant. This coupling establishes characteristic length and time scales for a large class of low energy quantum states, and it guides the choice of step sizes in numerical work. Using the BCH method in conjunction with an imaginary time rotation, we compute low energy eigenstates for several quantum systems coupled to non-trivial background potentials. The approach is subsequently applied to the study of 1D propagating wave packets and 2D bound state time development. Failures of classical expectations uncovered by simulations of these simple systems help develop quantum intuition. Finally, we investigate the response of a Superconducting Quantum Interference Device (SQUID) to a time dependent potential. We discuss how to engineer the potential's energy and time scales so that the SQUID acts as a quantum NOT gate. The notional simulation we present for this gate provides useful insight into the design of one candidate building block for a quantum computer.

  17. Simulation and sequential dynamical systems

    SciTech Connect (OSTI)

    Mortveit, H.S.; Reidys, C.M.

    1999-06-01

    Computer simulations have a generic structure. Motivated by this the authors present a new class of discrete dynamical systems that captures this structure in a mathematically precise way. This class of systems consists of (1) a loopfree graph {Upsilon} with vertex set {l_brace}1,2,{hor_ellipsis},n{r_brace} where each vertex has a binary state, (2) a vertex labeled set of functions (F{sub i,{Upsilon}}:F{sub 2}{sup n} {yields} F{sub 2}{sup n}){sub i} and (3) a permutation {pi} {element_of} S{sub n}. The function F{sub i,{Upsilon}} updates the state of vertex i as a function of the states of vertex i and its {Upsilon}-neighbors and leaves the states of all other vertices fixed. The permutation {pi} represents the update ordering, i.e., the order in which the functions F{sub i,{Upsilon}} are applied. By composing the functions F{sub i,{Upsilon}} in the order given by {pi} one obtains the dynamical system (equation given in paper), which the authors refer to as a sequential dynamical system, or SDS for short. The authors will present bounds for the number of functionally different systems and for the number of nonisomorphic digraphs {Gamma}[F{sub {Upsilon}},{pi}] that can be obtained by varying the update order and applications of these to specific graphs and graph classes.

  18. Utility System Simulation: A Nonlinear Approach 

    E-Print Network [OSTI]

    Delk, S. R.

    1988-01-01

    SIMULATION: A NONLINEAR APPROACH STEPHEN R. DELK, P.E. Owner The MESA Company The Woodlands, Texas ABSTRACT Computer simulation of plant utility systems allows an engineer to rapidly I) analyze operation changes, 2) analyze design changes..., and 3) optimize the steam/electric system for the lowest operating cost. MESA (Modular Energy System Analyzer) is a PC-based computer program that can be configured to accurately simulate plant utility systems. MESA uses a modular modeling approach...

  19. Energy Savings Potential and RD&D Opportunities for Non-Vapor-Compression HVAC Technologies

    SciTech Connect (OSTI)

    none,

    2014-03-01

    While vapor-compression technologies have served heating, ventilation, and air-conditioning (HVAC) needs very effectively, and have been the dominant HVAC technology for close to 100 years, the conventional refrigerants used in vapor-compression equipment contribute to global climate change when released to the atmosphere. This Building Technologies Office report: --Identifies alternatives to vapor-compression technology in residential and commercial HVAC applications --Characterizes these technologies based on their technical energy savings potential, development status, non-energy benefits, and other factors affecting end-user acceptance and their ability to compete with conventional vapor-compression systems --Makes specific research, development, and deployment (RD&D) recommendations to support further development of these technologies, should DOE choose to support non-vapor-compression technology further.

  20. Energy Renovations: Volume 14: HVAC - A Guide for Contractors to Share with Homeowners

    SciTech Connect (OSTI)

    Gilbride, Theresa L.; Baechler, Michael C.; Hefty, Marye G.; Hand, James R.; Love, Pat M.

    2011-08-29

    This report was prepared by PNNL for DOE's Building America program and is intended as a guide that energy performance contractors can share with homeowners to describe various energy-efficient options for heating, cooling, and ventilating existing homes. The report provides descriptions of many common and not-so-common HVAC systems, including their advantages and disadvantages, efficiency ranges and characteristics of high-performance models, typical costs, and climate considerations. The report also provides decision trees and tables of useful information for homeowners who are making decisions about adding, replacing, or upgrading existing HVAC equipment in their homes. Information regarding home energy performance assessments (audits) and combustion safety issues when replacing HVAC equipment are also provided.

  1. This paper has been downloaded from the Building and Environmental Thermal Systems Research Group at Oklahoma State University (www.hvac.okstate.edu)

    E-Print Network [OSTI]

    In ENERGYPLUS. Proceedings of Building Simulation '99, Volume 2: 653-660. #12;1 ENHANCING AND EXTENDING THE CAPABILITIES OF THE BUILDING HEAT BALANCE SIMULATION TECHNIQUE FOR USE IN ENERGYPLUS Richard Strand, School achieved by the team of researchers developing the EnergyPlus program for the United States Department

  2. Nuclear Systems Modeling, Simulation & Validation | Nuclear Science...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Research Areas Fuel Cycle Science & Technology Fusion Nuclear Science Isotope Development and Production Nuclear Security Science & Technology Nuclear Systems Modeling, Simulation...

  3. System Simulations of Hybrid Electric Vehicles with Focus on...

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

    System Simulations of Hybrid Electric Vehicles with Focus on Emissions System Simulations of Hybrid Electric Vehicles with Focus on Emissions Comparative simulations of hybrid...

  4. Method for simulating discontinuous physical systems

    DOE Patents [OSTI]

    Baty, Roy S. (Albuquerque, NM); Vaughn, Mark R. (Albuquerque, NM)

    2001-01-01

    The mathematical foundations of conventional numerical simulation of physical systems provide no consistent description of the behavior of such systems when subjected to discontinuous physical influences. As a result, the numerical simulation of such problems requires ad hoc encoding of specific experimental results in order to address the behavior of such discontinuous physical systems. In the present invention, these foundations are replaced by a new combination of generalized function theory and nonstandard analysis. The result is a class of new approaches to the numerical simulation of physical systems which allows the accurate and well-behaved simulation of discontinuous and other difficult physical systems, as well as simpler physical systems. Applications of this new class of numerical simulation techniques to process control, robotics, and apparatus design are outlined.

  5. Parallel Implementation of Power System Dynamic Simulation

    SciTech Connect (OSTI)

    Jin, Shuangshuang; Huang, Zhenyu; Diao, Ruisheng; Wu, Di; Chen, Yousu

    2013-07-21

    Dynamic simulation of power system transient stability is important for planning, monitoring, operation, and control of electrical power systems. However, modeling the system dynamics and network involves the computationally intensive time-domain solution of numerous differential and algebraic equations (DAE). This results in a transient stability implementation that may not maintain the real-time constraints of an online security assessment. This paper presents a parallel implementation of the dynamic simulation on a high-performance computing (HPC) platform using parallel simulation algorithms and computation architectures. It enables the simulation to run even faster than real time, enabling the “look-ahead” capability of upcoming stability problems in the power grid.

  6. This paper was downloaded from the Oklahoma State University Building and Environmental Thermal Systems Research Group website, www.hvac.okstate.edu.

    E-Print Network [OSTI]

    design flow velocities on system performance of ground source heat pump systems in cold climates. ASHRAE Exchanger Design Flow Velocities on System Performance of Ground Source Heat Pump Systems in Cold Climates guidelines for ground source heat pump (GSHP) systems provide recommendations for minimum and maximum flow

  7. Monte Carlo simulation in systems biology

    E-Print Network [OSTI]

    Schellenberger, Jan

    2010-01-01

    2 The history of Monte Carlo Sampling in Systems Biology 1.1simulation tools: the systems biology workbench and biospiceCellular and Molecular Biology. ASM Press, Washington

  8. Duty-Cycling Buildings Aggressively: The Next Frontier in HVAC Control

    E-Print Network [OSTI]

    Simunic, Tajana

    network across an entire floor of a university building and our data shows several periods of low energy savings of 7.59% to 12.85% for the HVAC system by controlling just one floor of our four floor- sumers can be lighting, computing infrastructure, or what is most often the case, heating ventilation

  9. Modeling Building Thermal Response to HVAC Virginia Smith, Tamim Sookoor, and Kamin Whitehouse

    E-Print Network [OSTI]

    Whitehouse, Kamin

    temperatures has to be predicted. Making such a prediction is complicated by the fact that weather has a larger the influence of the HVAC system. We present a technique for dynamically estimating the heat load due to weather rooms at a comfortable temperature without wasting any energy conditioning unoccupied rooms. Many homes

  10. Power Parks System Simulation Sandia National Laboratories

    E-Print Network [OSTI]

    , a simulation tool will be very useful in evaluating the systems, and optimizing their performance with respect to efficiency and cost. 1 Proceedings of the 2002 U.S. DOE Hydrogen Program Review NREL/CP-610-32405 #12. Simulink performs dynamic simulation by integrating the system in time using a collection of ordinary

  11. This paper has been downloaded from the Building and Environmental Thermal Systems Research Group at Oklahoma State University (www.hvac.okstate.edu)

    E-Print Network [OSTI]

    -Loop Ground-Source Heat Pump Systems. ASHRAE Transactions. 106(1): 380-393. Reprinted by permission from. INTRODUCTION Ground-source heat pump systems have become increas- ingly popular for both residential with conventional systems. In closed-loop ground- source heat pump systems, heat rejection/extraction is accom

  12. This paper has been downloaded from the Building and Environmental Thermal Systems Research Group at Oklahoma State University (www.hvac.okstate.edu)

    E-Print Network [OSTI]

    .D. Smith, J.D. Spitler. 2002. Advances in Ground Source Heat Pump Systems - An International Overview-22, 2002. #12;313 ADVANCES IN GROUND SOURCE HEAT PUMP SYSTEMS AN INTERNATIONAL OVERVIEW James E. Bose, Ph properties, modeling of ground source heat pump systems, development of hybrid systems and further

  13. This paper has been downloaded from the Building and Environmental Thermal Systems Research Group at Oklahoma State University (www.hvac.okstate.edu)

    E-Print Network [OSTI]

    . INTRODUCTION Ground source heat pump systems have become increas- ingly popular for both residential to air source heat pump systems, ground source systems have not been so widely used. This may tools. In ground source heat pump systems, heat is extracted from or rejected to the ground via either

  14. This paper has been downloaded from the Building and Environmental Thermal Systems Research Group at Oklahoma State University (www.hvac.okstate.edu)

    E-Print Network [OSTI]

    source heat pump systems, and design of hybrid ground source systems. This paper describes-coupled heat pump systems is important for design of ground loop heat exchangers, energy analysis of ground in ground-coupled heat pump systems. The short time-step response factors allow for a direct evalu- ation

  15. This paper has been downloaded from the Building and Environmental Thermal Systems Research Group at Oklahoma State University (www.hvac.okstate.edu)

    E-Print Network [OSTI]

    properties, modeling of ground source heat pump systems, development of hybrid systems and further.D. Smith, J.D. Spitler. 2002. Advances in Ground Source Heat Pump Systems - An International Overview. Proceedings of the Seventh International Energy Agency Heat Pump Conference. 1:313-324. Beijing. May 19

  16. This paper has been downloaded from the Building and Environmental Thermal Systems Research Group at Oklahoma State University (www.hvac.okstate.edu)

    E-Print Network [OSTI]

    . Underwood. 2003. UK Application of Direct Cooling Ground Source Heat Pump Systems. Proceedings of ASHRAE Tyne, NE18ST, chris.underwood@unn.ac.uk Summary One form of ground-source heat pump (GSHP) system system with condensing gas boilers and vapor compression refrigeration. Introduction Ground source heat

  17. This paper has been downloaded from the Building and Environmental Thermal Systems Research Group at Oklahoma State University (www.hvac.okstate.edu)

    E-Print Network [OSTI]

    .J. Rees, and C. Yavuzturk. 2000. Recent Developments in Ground Source Heat Pump System Design, Modelling A28, p.34. #12;Page 1 of 1 Recent Developments in Ground Source Heat Pump System Design, Modeling research and developments in ground source heat pump system design, modeling, and applications

  18. HVAC Equipment Design Options for Near-Zero-Energy Homes (NZEH) -A Stage 2 Scoping Assessment

    SciTech Connect (OSTI)

    Baxter, Van D

    2005-11-01

    Although the energy efficiency of heating, ventilating, and air-conditioning (HVAC) equipment has increased substantially in recent years, new approaches are needed to continue this trend. Conventional unitary equipment and system designs have matured to a point where cost-effective, dramatic efficiency improvements that meet near-zero-energy housing (NZEH) goals require a radical rethinking of opportunities to improve system performance. The large reductions in HVAC energy consumption necessary to support the NZEH goals require a systems-oriented analysis approach that characterizes each element of energy consumption, identifies alternatives, and determines the most cost-effective combination of options. In particular, HVAC equipment must be developed that addresses the range of special needs of NZEH applications in the areas of reduced HVAC and water heating energy use, humidity control, ventilation, uniform comfort, and ease of zoning. This report describes results of a scoping assessment of HVAC system options for NZEH homes. ORNL has completed a preliminary adaptation, for consideration by The U.S. Department of Energy, Energy Efficiency and Renewable Energy Office, Building Technologies (BT) Program, of Cooper's (2001) stage and gate planning process to the HVAC and Water Heating element of BT's multi-year plan, as illustrated in Figure 1. In order to adapt to R&D the Cooper process, which is focused on product development, and to keep the technology development process consistent with an appropriate role for the federal government, the number and content of the stages and gates needed to be modified. The potential federal role in technology development involves 6 stages and 7 gates, but depending on the nature and status of the concept, some or all of the responsibilities can flow to the private sector for product development beginning as early as Gate 3. In the proposed new technology development stage and gate sequence, the Stage 2 'Scoping Assessment' provides the deliverable leading into the Gate 3 'Scoping Assessment Screen'. This report is an example of a Stage 2 deliverable written to document the screening of options against the Gate 3 criteria and to support DOE decision making and option prioritization. The objective of this scoping assessment was to perform a transparent evaluation of the HVAC system options for NZEH based on the applying the Gate 3 criteria uniformly to all options.

  19. R&D Opportunity Assessment: Joining Technologies in HVAC&R -...

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

    R&D Opportunity Assessment: Joining Technologies in HVAC&R - Workshop on Joining Technologies in HVAC&R R&D Opportunity Assessment: Joining Technologies in HVAC&R - Workshop on...

  20. Higher Efficiency HVAC Motors | Department of Energy

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:FinancingPetroleum12,ExecutiveFinancingR Walls - Building America Topa HighHigher Efficiency HVAC

  1. HVAC, Water Heating, and Appliances Overview - 2015 BTO Peer...

    Office of Environmental Management (EM)

    Heating, and Appliances Overview - 2015 BTO Peer Review HVAC, Water Heating, and Appliances Overview - 2015 BTO Peer Review Presenter: Tony Bouza, U.S. Department of Energy View...

  2. Pre-Commercial Demonstration of Cost-Effective Advanced HVAC...

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

    Research Center Optimal control coordination of heating, ventilation, and air conditioning (HVAC) equipment can reduce energy by more than 20% over current building...

  3. Columbia Water & Light- HVAC and Lighting Efficiency Rebates

    Broader source: Energy.gov [DOE]

    Columbia Water & Light (CWL) offers rebates to its commercial and industrial customers for the purchase of high efficiency HVAC installations and efficient lighting. Incentives for certain...

  4. Building America Top Innovations 2014 Profile: HVAC Cabinet Air...

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

    Building Science Solutions Optimized Comfort Solutions HVAC Cabinet Air Leakage Test Method (top left) Building America teams evaluated several testing methods to identify...

  5. HVAC component data modeling using industry foundation classes

    E-Print Network [OSTI]

    Bazjanac, Vladimir; Forester, James; Haves, Philip; Sucic, Darko; Xu, Peng

    2002-01-01

    of HVAC components, such as boilers and actuators, with allTable 1. actuator air handler boiler chiller coil controllerattribute lists for the boiler and actuator components. A

  6. Inverted Attic Bulkhead for HVAC Ductwork, Roseville, California...

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

    for HVAC Ductwork Roseville, California PROJECT INFORMATION Project Name: Long-Term Monitoring of Occupied Test House Location: Roseville, CA Partners: K. Hovnanian Homes,...

  7. Thermoelectric HVAC and Thermal Comfort Enablers for Light-Duty...

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

    and Thermal Comfort Enablers for Light-Duty Vehicle Applications Thermoelectric HVAC and Thermal Comfort Enablers for Light-Duty Vehicle Applications 2012 DOE Hydrogen and Fuel...

  8. PV modules, with a life measured in decades, will typically be in place longer than the outdoor unit of a HVAC system.

    E-Print Network [OSTI]

    Johnson, Eric E.

    PV modules, with a life measured in decades, will typically be in place longer than the outdoor and repaired promptly. PV systems suffer gradual degradation that is often not monitored, and the PV array may with copper conductors. On the other hand, PV systems have numerous modules (tens to thousands) and mounting

  9. This paper has been downloaded from the Building and Environmental Thermal Systems Research Group at Oklahoma State University (http://www.hvac.okstate.edu).

    E-Print Network [OSTI]

    .D., J.D. Spitler, and S.J. Rees. 2006. Performance Analysis of Standing Column Well Ground Heat. A comparative life-cycle cost analysis is conducted considering 20 year system operation. INTRODUCTION Ground-source heat pump (GSHP) systems have been gaining increasing popularity in commercial and residential

  10. The simulation system SIMPLEX II 

    E-Print Network [OSTI]

    Schinagl, Josef Georg

    1995-01-01

    Scientists must model increasingly complex nonlinear systems in their attempt to solve real world problems. Especially when dealing with nonlinear systems, it is sometimes impossible to find a solution analytically. In ...

  11. This paper has been downloaded from the Building and Environmental Thermal Systems Research Group at Oklahoma State University (www.hvac.okstate.edu)

    E-Print Network [OSTI]

    . Ramamoorthy 2000. Bridge Deck Deicing using Geothermal Heat Pumps. Proceedings of the Fourth International using Geothermal Heat Pumps JEFFREY D. SPITLER, PH.D., P.E., MAHADEVAN RAMAMOORTHY Oklahoma State. A system with 16 heat pumps of nominal 30-ton capacity and 250 boreholes, each 76 m deep, was selected

  12. This paper has been downloaded from the Building and Environmental Thermal Systems Research Group at Oklahoma State University (www.hvac.okstate.edu)

    E-Print Network [OSTI]

    University Stillwater, OK, U.S.A. KEY WORDS Ground source heat pump systems, ground loop heat exchangers. GLHEPRO -- A Design Tool For Commercial Building Ground Loop Heat Exchangers. Proceedings of the Fourth International Heat Pumps in Cold Climates Conference, Aylmer, Québec. August 17-18, 2000. #12;GLHEPRO ­ A DESIGN

  13. This paper has been downloaded from the Building and Environmental Thermal Systems Research Group at Oklahoma State University (www.hvac.okstate.edu)

    E-Print Network [OSTI]

    ., V. Ghatti, D.E. Fisher, and D.G. Scheatzle. 2003. "Experimental Validation of the EnergyPlus Low systems. With the recent release of EnergyPlus (Crawley et al. 2000), designers now have the opportunity ASHRAE Vinay Ghatti Student MemberASHRAE The EnergyPlus low-temperature radiant model was experimentally

  14. Short communication Optimization of hybrid ground coupled and air source heat pump systems

    E-Print Network [OSTI]

    Fernández de Córdoba, Pedro

    Short communication Optimization of hybrid ­ ground coupled and air source ­ heat pump systems 2008 Accepted 14 January 2010 Available online 28 January 2010 Keywords: Ground coupled heat pump Air to water heat pump Thermal storage device Hybrid HVAC system Energy efficiency Numerical simulation a b

  15. High-performance commercial building systems

    E-Print Network [OSTI]

    Selkowitz, Stephen

    2003-01-01

    heat pump-based HVAC system (HPAC) and a continuously ventilating, and potentially more energy efficient Advanced Hybrid

  16. Modeling of Diesel Exhaust Systems: A methodology to better simulate...

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

    of Diesel Exhaust Systems: A methodology to better simulate soot reactivity Modeling of Diesel Exhaust Systems: A methodology to better simulate soot reactivity Discussed...

  17. M. Bahrami ENSC 461 (S 11) Gas Vapor Mixtures and HVAC 1 Gas Vapor Mixtures and HVAC

    E-Print Network [OSTI]

    Bahrami, Majid

    to the vapor pressure: Tdp = Tsat@ Pv Sling Psychrometer: a rotating set of thermometers one of which measuresM. Bahrami ENSC 461 (S 11) Gas Vapor Mixtures and HVAC 1 Gas Vapor Mixtures and HVAC Atmospheric air normally contains some water vapor (moisture). The dry-air contains no water. Although the amount

  18. Better Buildings Neighborhood Program Business Models Guide: HVAC Contractor Business Model Introduction

    Broader source: Energy.gov [DOE]

    Better Buildings Neighborhood Program Business Models Guide: HVAC Contractor Business Model Introduction.

  19. Dynamic Thermal Modeling of a Radiant Panels System and its Environment for Commissioning: Application to Case Study 

    E-Print Network [OSTI]

    Diaz, N. F.; Bertagnolio, S.; Andre, P.

    2009-01-01

    been collected. The simulation of the whole system is performed by means of a dynamic thermal model of the building and its HVAC system. The model considers the radiant panels as a dynamic-state finned heat exchanger connected to a simplified lumped...

  20. Measuring Advances in HVAC Distribution System Design

    E-Print Network [OSTI]

    Franconi, E.

    2011-01-01

    lIIvall RH avail Thermal Energy Thermal Avail Input energythermal based index EDE and thermal energy end-use indices.Thus mechanical and thermal energy sources can be combined

  1. Measuring Advances in HVAC Distribution System Design

    E-Print Network [OSTI]

    Franconi, E.

    2011-01-01

    Energy Efficiency and Renewable Energy, Office of BuildingEnergy Efficiency and Renewable Energy, Office of Building

  2. Measuring Advances in HVAC Distribution System Design

    E-Print Network [OSTI]

    Franconi, E.

    2011-01-01

    with the inlet flow stream and energy transfers. Thewhen the input energy/fuel streams are a different "quality"

  3. Measuring Advances in HVAC Distribution System Design

    E-Print Network [OSTI]

    Franconi, E.

    2011-01-01

    that provide a useful measure of energy utilization inresults from energy being a poor indicator of useful workuseful can be destroyed - the quality of the energy in the

  4. Designing Forced-Air HVAC Systems

    SciTech Connect (OSTI)

    2010-08-31

    This guide explains proper calculation of heating and cooling design loads for homes.used to calculated for the home using the protocols set forth in the latest edition of the Air Conditioning Contractors of America’s (ACCA) Manual J (currently the 8th edition), ASHRAE 2009 Handbook of Fundamentals, or an equivalent computation procedure.

  5. Wireless Demand Response Controls for HVAC Systems

    E-Print Network [OSTI]

    Federspiel, Clifford

    2010-01-01

    Linksys WRT54G3G-ST Wireless G router for mobile broadband.This router includes a 4-port switch, a wireless G accessrouters for connecting to the DRAS, and tested the wireless

  6. Advanced HVAC Systems | Department of Energy

    Broader source: Energy.gov (indexed) [DOE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of Natural GasAdjustmentsShirleyEnergyTher i n c i p a l De p u t y A sCOLONY PROJECTRecord For Irradiation -- Indian

  7. Universal simulation of Markovian open quantum systems

    E-Print Network [OSTI]

    Ryan Sweke; Ilya Sinayskiy; Denis Bernard; Francesco Petruccione

    2015-07-02

    We consider the problem of constructing a "universal set" of Markovian processes, such that any Markovian open quantum system, described by a one-parameter semigroup of quantum channels, can be simulated through sequential simulations of processes from the universal set. In particular, for quantum systems of dimension $d$, we explicitly construct a universal set of semigroup generators, parametrized by $d^2-3$ continuous parameters, and prove that a necessary and sufficient condition for the dynamical simulation of a $d$ dimensional Markovian quantum system is the ability to implement a) quantum channels from the semigroups generated by elements of the universal set of generators, and b) unitary operations on the system. Furthermore, we provide an explicit algorithm for simulating the dynamics of a Markovian open quantum system using this universal set of generators, and show that it is efficient, with respect to this universal set, when the number of distinct Lindblad operators (representing physical dissipation processes) scales polynomially with respect to the number of subsystems.

  8. LHC RF System Time-Domain Simulation

    SciTech Connect (OSTI)

    Mastorides, T.; Rivetta, C.

    2010-09-14

    Non-linear time-domain simulations have been developed for the Positron-Electron Project (PEP-II) and the Large Hadron Collider (LHC). These simulations capture the dynamic behavior of the RF station-beam interaction and are structured to reproduce the technical characteristics of the system (noise contributions, non-linear elements, and more). As such, they provide useful results and insight for the development and design of future LLRF feedback systems. They are also a valuable tool for the study of diverse longitudinal beam dynamics effects such as coupled-bunch impedance driven instabilities and single bunch longitudinal emittance growth. Results from these studies and related measurements from PEP-II and LHC have been presented in multiple places. This report presents an example of the time-domain simulation implementation for the LHC.

  9. Maui Electrical System Simulation Model Validation

    E-Print Network [OSTI]

    Maui Electrical System Simulation Model Validation Prepared for the U.S. Department of Energy Office of Electricity Delivery and Energy Reliability Under Award No. DE-FC-06NT42847 Task 9 Deliverable was prepared by General Electric Company (GE) as an account of work sponsored by the Hawaii Natural Energy

  10. The Dwyer Series 640 air velocity transmitter is ideal for a wide range of HVAC measurement and control applications, particularly

    E-Print Network [OSTI]

    Berns, Hans-Gerd

    measurements, supply and exhaust fan tracking, industrial hygiene and clean-room systems, air pollution studiesThe Dwyer Series 640 air velocity transmitter is ideal for a wide range of HVAC measurement for use in reasonably clean and dry air streams, appli- cations include multi-point air velocity

  11. Strategy Guideline: Transitioning HVAC Companies to Whole House Performance Contractors

    SciTech Connect (OSTI)

    Burdick, A.

    2012-05-01

    This report describes the findings from research IBACOS conducted related to heating, ventilation, and air conditioning (HVAC) companies who have made the decision to transition to whole house performance contracting (WHPC).

  12. Industrial HVAC Air-to-Air Energy Recovery Retrofit Economics 

    E-Print Network [OSTI]

    Graham, E. L.

    1980-01-01

    Retrofitting air-to-air energy recovery equipment is relatively simply to design and easy to install. Additionally, HVAC energy recovery is almost risk free when compared to process retrofit. Life cycle cost analysis is the best way to illustrate...

  13. Strategy Guideline. Transitioning HVAC Companies to Whole House Performance Contractors

    SciTech Connect (OSTI)

    Burdick, Arlan

    2012-05-01

    This report describes the findings from research IBACOS conducted related to heating, ventilation, and air conditioning (HVAC) companies who have made the decision to transition to whole house performance contracting (WHPC).

  14. Nuclear engine system simulation (NESS) program update

    SciTech Connect (OSTI)

    Scheil, C.M.; Pelaccio, D.G. (Science Applications International Corporation, 10717 Griffith Park Drive NE, Albuquerque, NM 87123 (United States)); Petrosky, L.J. (Westinghouse Electric Corporation, Advanced Energy Systems, Waltz Mill Site Madison, PA 15663 (United States))

    1993-01-20

    The second phase of development of a Nuclear Thermal Propulsion (NTP) engine system design analysis code has been completed. The standalone, versatile Nuclear Engine System Simulation (NESS) code provides an accurate, detailed assessment of engine system operating performance, weight, and sizes. The critical information is required to support ongoing and future engine system and stage design study efforts. This recent development effort included incorporation of an updated solid-core nuclear thermal reactor model that yields a reduced core weight and higher fuel power density when compared to a NERVA type reactor. NESS can now analyze expander, gas generator, and bleed cycles, along with multi-redundant propellant pump feed systems. Performance and weight of efficient multi-stage axial turbopump can now be determined, in addition to the traditional centrifugal pump.

  15. INFORMATION INVASION IN ENTERPRISE SYSTEMS Modelling, simulating and analysing system-level information propagation

    E-Print Network [OSTI]

    Henderson, Peter

    INFORMATION INVASION IN ENTERPRISE SYSTEMS Modelling, simulating and analysing system@ecs.soton.ac.uk Keywords: Enterprise information systems, Systems-level modelling, System simulation. A significant problem facing these organisations is how their information systems will cope with inconsistency

  16. Simulation of cooling systems in gas turbines

    SciTech Connect (OSTI)

    Ebenhoch, G.; Speer, T.M. [Motoren- und Turbinen-Union Muenchen GmbH (Germany)

    1996-04-01

    The design of cooling systems for gas turbine engine blades and vanes calls for efficient simulation programs. The main purpose of the described program is to determine the complete boundary condition at the coolant side to support a temperature calculation for the solid. For the simulation of convection and heat pick up of the coolant flow, pressure loss, and further effects to be found in a rotating frame, the cooling systems are represented by networks of nodes and flow elements. Within each flow element the fluid flow is modeled by a system of ordinary differential equations based on the one-dimensional conservation of mass, momentum, and energy. In this respect, the computer program differs from many other network computation programs. Concerning cooling configurations in rotating systems, the solution for a single flow element or the entire flow system is not guaranteed to be unique. This is due to rotational forces in combination with heat transfer and causes considerable computational difficulties, which can be overcome by a special path following method in which the angular velocity is selected as the parameter of homotopy. Results of the program are compared with measurements for three applications.

  17. CoolCab Test and Evaluation and CoolCalc HVAC Tool Development...

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

    Test and Evaluation and CoolCalc HVAC Tool Development CoolCab Test and Evaluation and CoolCalc HVAC Tool Development 2012 DOE Hydrogen and Fuel Cells Program and Vehicle...

  18. CoolCab Test and Evaluation and CoolCalc HVAC Tool Development...

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

    Evaluation and CoolCalc HVAC Tool Development CoolCab Test and Evaluation and CoolCalc HVAC Tool Development 2013 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies...

  19. Critical Question #4: What are the Best Off-the-Shelf HVAC Solutions...

    Energy Savers [EERE]

    4: What are the Best Off-the-Shelf HVAC Solutions for Low-Load, High-Performance Homes and Apartments? Critical Question 4: What are the Best Off-the-Shelf HVAC Solutions for...

  20. Issue #7: What are the Best HVAC Solutions for Low-Load, High...

    Energy Savers [EERE]

    7: What are the Best HVAC Solutions for Low-Load, High Performance Homes? Issue 7: What are the Best HVAC Solutions for Low-Load, High Performance Homes? What components and...

  1. CoolCab Thermal Load Reduction Project: CoolCalc HVAC Tool Development...

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

    Thermal Load Reduction Project: CoolCalc HVAC Tool Development CoolCab Thermal Load Reduction Project: CoolCalc HVAC Tool Development 2010 DOE Vehicle Technologies and Hydrogen...

  2. Building America Whole-House Solutions for New Homes: HVAC Design...

    Energy Savers [EERE]

    HVAC Design Strategy for a Hot-Humid Production Builder Building America Whole-House Solutions for New Homes: HVAC Design Strategy for a Hot-Humid Production Builder In this...

  3. Validation of a Building Simulation Tool Using Field Data for Three Identical Configuration Full-Serve Restaurants Using Different HVAC Systems 

    E-Print Network [OSTI]

    Brillhart, P. L.; Worek, W. M.

    2000-01-01

    Philadelphia, PA, National Renewable Energy Laboratory (NREL) hour-by-hour bin TMY2 meteorological data was used for Philadelphia to model the annual outdoor conditions experienced by each site. Output was provided in the form of humidity bins, monthly energy...

  4. Deposition of biological aerosols on HVAC heat exchangers

    SciTech Connect (OSTI)

    Siegel, Jeffrey; Walker, Ian

    2001-09-01

    Many biologically active materials are transported as bioaerosols 1-10 {micro}m in diameter. These particles can deposit on cooling and heating coils and lead to serious indoor air quality problems. This paper investigates several of the mechanisms that lead to aerosol deposition on fin and tube heat exchangers. A model has been developed that incorporates the effects of several deposition mechanisms, including impaction, Brownian and turbulent diffusion, turbophoresis, thermophoresis, diffusiophoresis, and gravitational settling. The model is applied to a typical range of air velocities that are found in commercial and residential HVAC systems 1 - 6 m/s (200 - 1200 ft/min), particle diameters from 1 - 8 {micro}m, and fin spacings from 3.2 - 7.9 fins/cm (8 - 16 fins/inch or FPI). The results from the model are compared to results from an experimental apparatus that directly measures deposition on a 4.7 fins/cm (12 FPI) coil. The model agrees reasonably well with this measured data and suggests that cooling coils are an important sink for biological aerosols and consequently a potential source of indoor air quality problems.

  5. On sequential dynamical systems and simulation

    SciTech Connect (OSTI)

    Barrett, C.L.; Mortveit, H.S.; Reidys, C.M.

    1999-06-01

    The generic structure of computer simulations motivates a new class of discrete dynamical systems that captures this structure in a mathematically precise way. This class of systems consists of (1) a loopfree graph {Upsilon} with vertex set {l_brace}1,2,{hor_ellipsis},n{r_brace} where each vertex has a binary state, (2) a vertex labeled set of functions (F{sub i,{Upsilon}}:F{sub 2}{sup n} {r_arrow} F{sub 2}{sup n}){sub i} and (3) a permutation {pi} {element_of} S{sub n}. The function F{sub i,{Upsilon}} updates the state of vertex i as a function of the states of vertex i and its {Upsilon}-neighbors and leaves the states of all other vertices fixed. The permutation {pi} represents the update ordering, i.e., the order in which the functions F{sub i,{Upsilon}} are applied. By composing the functions F{sub i,{Upsilon}} in the order given by {pi} one obtains the dynamical system (equation given in paper) which the authors refer to as a sequential dynamical system, or SDS for short. The authors will present bounds for the number of functionally different systems and for the number of nonisomorphic digraphs {Gamma}[F{sub {Upsilon}},{pi}] that can be obtained by varying the update order and applications of these to specific graphs and graph classes. This will be done using both combinatorial/algebraic techniques and probabilistic techniques. Finally the authors give results on dynamical system properties for some special systems.

  6. High Performance HVAC Systems, Part II: Low-Load HVAC Systems for Single and Multifamily Applications

    Broader source: Energy.gov [DOE]

    The Building America Program hosted this no-cost webinar that will discuss the current research on comfort in residential buildings. Results will be presented from 37 new homes that were monitored...

  7. Nonlinear Electrical Simulation of High-Power Synchronous Generator System

    E-Print Network [OSTI]

    Wu, Thomas

    power density, the generator operates in nonlinear region of the magnetic circuit. Magnetic Finite for motor simulation [I]. Fardoun simulated permanent-magnet machine drive system using SPlCE [2]. NatarajanNonlinear Electrical Simulation of High-Power Synchronous Generator System Jie Chen and Thomas Wu

  8. Methodological advances in computer simulation of biomolecular systems

    E-Print Network [OSTI]

    Fischer, Wolfgang

    Methodological advances in computer simulation of biomolecular systems Wilfred F. van Gunsteren Computer simulation of the dynamics of biomolecular systems by the molecular dynamics technique yields computing power. Recent advances in simulation methodology e.g. to rapidly compute many free energies from

  9. Research and Implementation of Computer Simulation System for Neural Networks

    E-Print Network [OSTI]

    Byrne, John H.

    Research and Implementation of Computer Simulation System for Neural Networks Chen, Houjin Yuan: The ability of a neural network to process information and to generate a specific pattern of electrical computer simulation system for neural networks was designed and implemented including system architecture

  10. Handover Performance of HVAC Duct Based Indoor Wireless Networks

    E-Print Network [OSTI]

    Stancil, Daniel D.

    in indoor wireless net- works (IWN) that use heating, ventilation, and air conditioning (HVAC) ducts point to serve one floor and its staircase region achieves the best handover performance for IWN]. An alternative approach to transmitt/receive the RF signal is to use heating, ventilation, and airconditioning

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

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (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...

  12. A View on Future Building System Modeling and Simulation

    SciTech Connect (OSTI)

    Wetter, Michael

    2011-04-01

    This chapter presents what a future environment for building system modeling and simulation may look like. As buildings continue to require increased performance and better comfort, their energy and control systems are becoming more integrated and complex. We therefore focus in this chapter on the modeling, simulation and analysis of building energy and control systems. Such systems can be classified as heterogeneous systems because they involve multiple domains, such as thermodynamics, fluid dynamics, heat and mass transfer, electrical systems, control systems and communication systems. Also, they typically involve multiple temporal and spatial scales, and their evolution can be described by coupled differential equations, discrete equations and events. Modeling and simulating such systems requires a higher level of abstraction and modularisation to manage the increased complexity compared to what is used in today's building simulation programs. Therefore, the trend towards more integrated building systems is likely to be a driving force for changing the status quo of today's building simulation programs. Thischapter discusses evolving modeling requirements and outlines a path toward a future environment for modeling and simulation of heterogeneous building systems.A range of topics that would require many additional pages of discussion has been omitted. Examples include computational fluid dynamics for air and particle flow in and around buildings, people movement, daylight simulation, uncertainty propagation and optimisation methods for building design and controls. For different discussions and perspectives on the future of building modeling and simulation, we refer to Sahlin (2000), Augenbroe (2001) and Malkawi and Augenbroe (2004).

  13. Explosive simulants for testing explosive detection systems

    DOE Patents [OSTI]

    Kury, John W. (Danville, CA); Anderson, Brian L. (Lodi, CA)

    1999-09-28

    Explosives simulants that include non-explosive components are disclosed that facilitate testing of equipment designed to remotely detect explosives. The simulants are non-explosive, non-hazardous materials that can be safely handled without any significant precautions. The simulants imitate real explosives in terms of mass density, effective atomic number, x-ray transmission properties, and physical form, including moldable plastics and emulsions/gels.

  14. Simulation Models for Improved Water Heating Systems

    E-Print Network [OSTI]

    Lutz, Jim

    2014-01-01

    E. Inc. 1990. “Residential Water Heating Study: TechnicalScott. 2007. “HWSIM Hot Water Distribution Model Validationand Simulation of a Smart Water Heater. ” In Workshop in

  15. Application of real time transient temperature (RT{sup 3}) program on nuclear power plant HVAC analysis

    SciTech Connect (OSTI)

    Cai, Y.; Tomlins, V.A.; Haskell, N.L.; Giffels, F.W.

    1996-08-01

    A database oriented technical analysis program (RT) utilizing a lumped parameter model combined with a finite difference method was developed to concurrently simulate transient temperatures in single or multiple room(s)/area(s). Analyses can be seen for postulated design basis events, such as, 10CFR50 Appendix-R, Loss of Coolant Accident concurrent with Loss of Offsite Power (LOCA/LOOP), Station BlackOut (SBO), and normal station operating conditions. The rate of change of the air temperatures is calculated by explicitly solving a series of energy balance equations with heat sources and sinks that have been described. For building elements with heat absorbing capacity, an explicit Forward Time Central Space (FTCS) model of one dimensional transient heat conduction in a plane element is used to describe the element temperature profile. Heat migration among the rooms/areas is considered not only by means of conduction but also by means of natural convection induced by temperature differences through openings between rooms/areas. The program also provides a means to evaluate existing plant HVAC system performance. The performance and temperature control of local coolers/heaters can be also simulated. The program was used to calculate transient temperature profiles for several buildings and rooms housing safety-related electrical components in PWR and BWR nuclear power plants. Results for a turbine building and reactor building in a BWR nuclear power plant are provided here. Specific calculational areas were defined on the basis of elevation, physical barriers and components/systems. Transient temperature profiles were then determined for the bounding design basis events with winter and summer outdoor air temperatures.

  16. HVAC Design Strategy for a Hot-Humid Production Builder, Houston, Texas (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2014-03-01

    BSC worked directly with the David Weekley Homes - Houston division to redesign three floor plans in order to locate the HVAC system in conditioned space. The purpose of this project is to develop a cost effective design for moving the HVAC system into conditioned space. In addition, BSC conducted energy analysis to calculate the most economical strategy for increasing the energy performance of future production houses. This is in preparation for the upcoming code changes in 2015. The builder wishes to develop an upgrade package that will allow for a seamless transition to the new code mandate. The following research questions were addressed by this research project: 1. What is the most cost effective, best performing and most easily replicable method of locating ducts inside conditioned space for a hot-humid production home builder that constructs one and two story single family detached residences? 2. What is a cost effective and practical method of achieving 50% source energy savings vs. the 2006 International Energy Conservation Code for a hot-humid production builder? 3. How accurate are the pre-construction whole house cost estimates compared to confirmed post construction actual cost? BSC and the builder developed a duct design strategy that employs a system of dropped ceilings and attic coffers for moving the ductwork from the vented attic to conditioned space. The furnace has been moved to either a mechanical closet in the conditioned living space or a coffered space in the attic.

  17. A framework for on-line simulation systems 

    E-Print Network [OSTI]

    Drake, Glenn Richardson

    1996-01-01

    Simulation has traditionally been used for off-line planning and design. The advent of computer integrated manufacturing and flexible manufacturing systems has increased interest in shop floor control systems that use ...

  18. Dynamic wind turbine models in power system simulation tool

    E-Print Network [OSTI]

    Dynamic wind turbine models in power system simulation tool DIgSILENT Anca D. Hansen, Florin Iov Iov, Poul Sřrensen, Nicolaos Cutululis, Clemens Jauch, Frede Blaabjerg Title: Dynamic wind turbine system simulation tool PowerFactory DIgSILENT for different wind turbine concepts. It is the second

  19. Validating the Evaluation of Adaptive Systems by User Profile Simulation

    E-Print Network [OSTI]

    Bravo, Javier

    a simulation-based technique is proposed as an economic way for testing evaluation tools based on log analysisValidating the Evaluation of Adaptive Systems by User Profile Simulation Javier Bravo and Alvaro.ortigosa}@uam.es Abstract. Availability of automated tools and methods to evaluate adaptive systems is a fundamental

  20. An Improved Procedure for Developing Calibrated Hourly Simulation Models 

    E-Print Network [OSTI]

    Bou-Saada, T. E.; Haberl, J. S.

    1995-01-01

    . REFERENCES Abbas, M. 1993. Development of graphical indices for building energy data, M.S. Thesis, Energy Systems Rpt No. ESL-TH-93/12-02, Texas A&M University, College Station, TX. ASHRAE. 1991. ASHRAE handbook: 1991 HVAC applications volume. American... Support Office, University of Illinois Urbana-Champaign. Bou-Saada, T.E. 1994a. An improved procedure for developing a calibrated hourly simulation model of an electrically heated and cooled commercial building, M.S. Thesis, Energy Systems Rpt No. ESL- TH...

  1. Modeling particle deposition on HVAC heat exchangers

    E-Print Network [OSTI]

    Siegel, J.A.; Nazaroff, W.W.

    2002-01-01

    Vol. 11, pp 943-945. Muyshondt A, Nutter D, and Gordon M.particle deposition (Muyshondt et al. , 1998). The purposedynamic simulations of Muyshondt et al. (1998). Despite some

  2. Driven harmonic oscillator as a quantum simulator for open systems

    E-Print Network [OSTI]

    Jyrki Piilo; Sabrina Maniscalco

    2006-10-03

    We show theoretically how a driven harmonic oscillator can be used as a quantum simulator for non-Markovian damped harmonic oscillator. In the general framework, the results demonstrate the possibility to use a closed system as a simulator for open quantum systems. The quantum simulator is based on sets of controlled drives of the closed harmonic oscillator with appropriately tailored electric field pulses. The non-Markovian dynamics of the damped harmonic oscillator is obtained by using the information about the spectral density of the open system when averaging over the drives of the closed oscillator. We consider single trapped ions as a specific physical implementation of the simulator, and we show how the simulator approach reveals new physical insight into the open system dynamics, e.g. the characteristic quantum mechanical non-Markovian oscillatory behavior of the energy of the damped oscillator, usually obtained by the non-Lindblad-type master equation, can have a simple semiclassical interpretation.

  3. Simulation Models for Improved Water Heating Systems

    E-Print Network [OSTI]

    Lutz, Jim

    2014-01-01

    System Piping Time, Water, and Energy Waste- Phase I: TestSystem Piping Time, Water, and Energy Waste - Phase II TestSystem Piping Time, Water, and Energy Waste— Phase III: Test

  4. Simulation Methods for Optimal Experimental Design in Systems Biology

    E-Print Network [OSTI]

    Timmer, Jens

    Simulation Methods for Optimal Experimental Design in Systems Biology D. Faller Freiburg Center of a biological system, the authors conducted quantitative dynamic experiments from which the system structure and the parameters have to be deduced. Since biological systems have to cope with different environmental conditions

  5. Simulation of the secondary air system of aero engines

    SciTech Connect (OSTI)

    Kutz, K.J.; Speer, T.M. (MTU Motoren- und Turbinen-Union Muenchen GmbH, Munich (Germany))

    1994-04-01

    This paper describes a computer program for the simulation of secondary air systems. Typical flow system elements are presented, such as restrictors, tappings, seals, vortices, and coverplates. Two-phase flow as occurring in bearing chamber vent systems is briefly discussed. An algorithm is described for the solution of the resulting nonlinear equations. The validity of the simulation over the engine operation envelope is demonstrated by a comparison with test results.

  6. Reactor Subsystem Simulation for Nuclear Hybrid Energy Systems

    SciTech Connect (OSTI)

    Shannon Bragg-Sitton; J. Michael Doster; Alan Rominger

    2012-09-01

    Preliminary system models have been developed by Idaho National Laboratory researchers and are currently being enhanced to assess integrated system performance given multiple sources (e.g., nuclear + wind) and multiple applications (i.e., electricity + process heat). Initial efforts to integrate a Fortran-based simulation of a small modular reactor (SMR) with the balance of plant model have been completed in FY12. This initial effort takes advantage of an existing SMR model developed at North Carolina State University to provide initial integrated system simulation for a relatively low cost. The SMR subsystem simulation details are discussed in this report.

  7. DOE Zero Energy Ready Home Low Load High Efficiency HVAC Webinar (Text Version)

    Broader source: Energy.gov [DOE]

    Below is the text version of the DOE Zero Energy Ready Home webinar, Low Load High Efficiency HVAC, presented in May 2014.

  8. R&D Opportunity Assessment: Joining Technologies in HVAC&R -...

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

    HVAC&R More Documents & Publications Research & Development Roadmap: Next-Generation Low Global Warming Potential Refrigerants Advanced Rotating Heat Exchangers Working Fluids Low...

  9. Optimizing Your Motor-Driven System

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

    and air conditioning (HVAC) systems in many buildings use single or three-phase electrical power controlled by timers and thermostats to drive motors. These motors supply...

  10. Energy Management Systems: Maximizing Energy Savings

    Broader source: Energy.gov [DOE]

    This webinar covered how to optimize installations of new energy management systems, review EMS strategies following lighting/HVAC retrofit projects, and utilize excess EECBG funding.

  11. Proton corebeam system in the expanding solar wind: Hybrid simulations

    E-Print Network [OSTI]

    California at Berkeley, University of

    Proton corebeam system in the expanding solar wind: Hybrid simulations Petr Hellinger1,2 and Pavel 9 November 2011. [1] Results of a twodimensional hybrid expanding box simulation of a proton to a decrease of the ratio between the proton perpendicular and parallel temperatures as well as to an increase

  12. Simulation of diurnal thermal energy storage systems: Preliminary results

    SciTech Connect (OSTI)

    Katipamula, S.; Somasundaram, S.; Williams, H.R.

    1994-12-01

    This report describes the results of a simulation of thermal energy storage (TES) integrated with a simple-cycle gas turbine cogeneration system. Integrating TES with cogeneration can serve the electrical and thermal loads independently while firing all fuel in the gas turbine. The detailed engineering and economic feasibility of diurnal TES systems integrated with cogeneration systems has been described in two previous PNL reports. The objective of this study was to lay the ground work for optimization of the TES system designs using a simulation tool called TRNSYS (TRaNsient SYstem Simulation). TRNSYS is a transient simulation program with a sequential-modular structure developed at the Solar Energy Laboratory, University of Wisconsin-Madison. The two TES systems selected for the base-case simulations were: (1) a one-tank storage model to represent the oil/rock TES system, and (2) a two-tank storage model to represent the molten nitrate salt TES system. Results of the study clearly indicate that an engineering optimization of the TES system using TRNSYS is possible. The one-tank stratified oil/rock storage model described here is a good starting point for parametric studies of a TES system. Further developments to the TRNSYS library of available models (economizer, evaporator, gas turbine, etc.) are recommended so that the phase-change processes is accurately treated.

  13. Simulating Complex Window Systems using BSDF Data

    E-Print Network [OSTI]

    Konstantoglou, Maria

    2011-01-01

    complex fenestration systems (CFS) such as Venetian blindsproperties of the material that makes up the CFS, then2) CFS layer and window system sub-modelling, then ends with

  14. APPROXIMATE SIMULATION RELATIONS FOR HYBRID SYSTEMS 1

    E-Print Network [OSTI]

    Pappas, George J.

    . Pappas Department of Electrical and Systems Engineering University of Pennsylvania Philadelphia, PA been introduced as a powerful tool for the approximation of discrete and continuous systems systems approximation. An example of application in the context of safety verification is shown. Keywords

  15. The effect of shear on heat budgets in a simulated Mesoscale Convective System 

    E-Print Network [OSTI]

    Shaw, Justin David

    2000-01-01

    The evolution and structure of simulated Mesoscale Convective Systems (MCS) were examined using the Collaborative Model for Multiscale Atmospheric Simulations. Three numerical simulations were performed, with the amount ...

  16. System-Level Monitoring and Diagnosis of Building HVAC System

    E-Print Network [OSTI]

    Wu, Siyu

    2013-01-01

    Housing, energy and thermal comfort: A review of 10D. Liao, Evaluation on energy and thermal perfor- mance forsystematic evaluation on energy and thermal performance for

  17. A systems approach to retrofitting residential HVAC systems

    E-Print Network [OSTI]

    McWilliams, J.A.; Walker, I.S.

    2004-01-01

    LBNL’s Home Energy Saver (http://homeenergysaver.lbl.gov/),to DOE’s Home Energy Saver (homenergysaver.lbl.gov) and the

  18. Behavioral/Systems/Cognitive Embedding Multiple Trajectories in Simulated Recurrent

    E-Print Network [OSTI]

    Buonomano, Dean

    Behavioral/Systems/Cognitive Embedding Multiple Trajectories in Simulated Recurrent Neural Networks can be embedded in the network; and (2) the structure of the network became progressively more complex

  19. Simulation Algorithms in Vehicle System Dynamics MARTIN ARNOLD

    E-Print Network [OSTI]

    be considered as integration platform for simulation in vehicle system dynamics. In the present report we report the analysis of distributed physical phenomena like the elastic deformation of car components

  20. Systems integration and upgrade of an Engineering Flight Simulator 

    E-Print Network [OSTI]

    Alcorn, William Pleasant

    2002-01-01

    This thesis presents the system integration and upgrade of the Texas A&M Flight Mechanics Laboratory Engineering Flight Simulator (EFS). This upgrade replaced the previous EFS, a simplistic design that did not resemble an aircraft cockpit...

  1. A Simulation Study of Demand Responsive Transit System Design

    E-Print Network [OSTI]

    Dessouky, Maged

    A Simulation Study of Demand Responsive Transit System Design Luca Quadrifoglio, Maged M. Dessouky changed the landscape for demand responsive transit systems. First, the demand for this type of transit experiencing increased usage for demand responsive transit systems. The National Transit Summaries and Trends

  2. Simulation and analysis of district-heating and -cooling systems

    SciTech Connect (OSTI)

    Bloomster, C.H.; Fassbender, L.L.

    1983-03-01

    A computer simulation model, GEOCITY, was developed to study the design and economics of district heating and cooling systems. GEOCITY calculates the cost of district heating based on climate, population, energy source, and financing conditions. The principal input variables are minimum temperature, heating degree-days, population size and density, energy supply temperature and distance from load center, and the interest rate. For district cooling, maximum temperature and cooling degree-hours are required. From this input data the model designs the fluid transport and district heating systems. From this design, GEOCITY calculates the capital and operating costs for the entire system. GEOCITY was originally developed to simulate geothermal district heating systems and thus, in addition to the fluid transport and distribution models, it includes a reservoir model to simulate the production of geothermal energy from geothermal reservoirs. The reservoir model can be adapted to simulate the supply of hot water from any other energy source. GEOCITY has been used extensively and has been validated against other design and cost studies. GEOCITY designs the fluid transport and distribution facilities and then calculates the capital and operating costs for the entire system. GEOCITY can simulate nearly any financial and tax structure through varying the rates of return on equity and debt, the debt-equity ratios, and tax rates. Both private and municipal utility systems can be simulated.

  3. Simulation Models for Improved Water Heating Systems

    E-Print Network [OSTI]

    Lutz, Jim

    2014-01-01

    with studies of solar water heaters. Another area withto model hybrid water heaters or solar thermal systems. Theof a Gas Tankless Water Heater. ” In SOLAR 2008 San Diego,

  4. Ocean Observing System Simulation Experiments at AOML

    E-Print Network [OSTI]

    criteria and rigorous validation methods developed for atmospheric OSSE systems* · Partnership with CIMAS The system has been rigorously validated to demonstrate that credible impact assessments are obtained without: Improve ocean analyses and forecasts for two applications · Predict transport and dispersion of oil spills

  5. Chapitre 8: Simulation for Product Driven Systems

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    of controlling production through traditional MRP˛ systems. hal-00341987,version1-26Nov2008 Author manuscript) 221-255" #12;There is a large consensus in the IMS community between holonic control, production to the planning function is based on the five steps Manufacturing Planning and Control System (MPCS) structure

  6. Parallel Computing Environments and Methods for Power Distribution System Simulation

    SciTech Connect (OSTI)

    Lu, Ning; Taylor, Zachary T.; Chassin, David P.; Guttromson, Ross T.; Studham, Scott S.

    2005-11-10

    The development of cost-effective high-performance parallel computing on multi-processor super computers makes it attractive to port excessively time consuming simulation software from personal computers (PC) to super computes. The power distribution system simulator (PDSS) takes a bottom-up approach and simulates load at appliance level, where detailed thermal models for appliances are used. This approach works well for a small power distribution system consisting of a few thousand appliances. When the number of appliances increases, the simulation uses up the PC memory and its run time increases to a point where the approach is no longer feasible to model a practical large power distribution system. This paper presents an effort made to port a PC-based power distribution system simulator (PDSS) to a 128-processor shared-memory super computer. The paper offers an overview of the parallel computing environment and a description of the modification made to the PDSS model. The performances of the PDSS running on a standalone PC and on the super computer are compared. Future research direction of utilizing parallel computing in the power distribution system simulation is also addressed.

  7. Simulation models of subsea umbilicals, flowlines and fire pump systems

    SciTech Connect (OSTI)

    Bratland, O.

    1995-12-01

    This paper discusses mathematical models suited for simulating transient and stationary flow in umbilicals, flowlines and fire pump systems. Most emphasis is put on subsea systems. Measurements are compared with simulations and good agreement has been achieved. The results show that the dynamics and response time in a hydraulic subsea control system can be influenced by parameters like umbilical elastic properties, umbilical visco-elastic properties, transition between laminar and turbulent flow, and some frequency-dependant propagation mechanisms. The paper discusses typical problems in different flow systems. It is also shown how the relevant umbilical properties can be determined by simple measurements on a short test section of the umbilical. In fire pump systems, cavitation is typically the main transient problem. In long oil and gas pipelines, the friction dominates and an accurate representation of the friction is the best contribution to relevant simulation results.

  8. Computer Modeling and Simulation of an Active Vision Camera System MingChin Lu

    E-Print Network [OSTI]

    Subbarao, Murali "Rao"

    Computer Modeling and Simulation of an Active Vision Camera System Ming­Chin Lu Communications of computer simulation systems. Computer simulation avoids the necessity of building actual camera systems. Based on the proposed model and algorithms, a computer simulation system called Active Vision Simulator

  9. UGA DESIGN & CONSTRUCTION SUPPLEMENTAL GENERAL REQUIREMENTS & STANDARDS GENERAL MECHANICAL REQUIREMENTS (HVAC)

    E-Print Network [OSTI]

    Arnold, Jonathan

    UGA DESIGN & CONSTRUCTION SUPPLEMENTAL GENERAL REQUIREMENTS & STANDARDS GENERAL MECHANICAL REQUIREMENTS (HVAC) JANUARY 16, 2015 23 00 001 23 00 00 GENERAL MECHANICAL REQUIREMENTS (HVAC) 1. GENERAL A. Related sections: i. 00 00 07 ­ Design Professional Design Process Requirements ii. 00 00

  10. A LIBRARY OF HVAC COMPONENT MODELS FOR USE IN AUTOMATED1 DIAGNOSTICS2

    E-Print Network [OSTI]

    A LIBRARY OF HVAC COMPONENT MODELS FOR USE IN AUTOMATED1 DIAGNOSTICS2 3 4 Peng Xu, Philip Haves a library of equipment reference models developed for automated fault detection and diagnosis of secondary of automatic documentation methods in the library. INTRODUCTION The increasing complexity of building HVAC

  11. Modeling particle deposition on HVAC heat exchangers

    SciTech Connect (OSTI)

    Siegel, J.A.; Nazaroff, W.W.

    2002-01-01

    Fouling of fin-and-tube heat exchangers by particle deposition leads to diminished effectiveness in supplying ventilation and air conditioning. This paper explores mechanisms that cause particle deposition on heat exchanger surfaces. We present a model that accounts for impaction, diffusion, gravitational settling, and turbulence. Simulation results suggest that some submicron particles deposit in the heat exchanger core, but do not cause significant performance impacts. Particles between 1 and 10 {micro}m deposit with probabilities ranging from 1-20% with fin edge impaction representing the dominant mechanism. Particles larger than 10 {micro}m deposit by impaction on refrigerant tubes, gravitational settling on fin corrugations, and mechanisms associated with turbulent airflow. The model results agree reasonably well with experimental data, but the deposition of larger particles at high velocities is underpredicted. Geometric factors, such as discontinuities in the fins, are hypothesized to be responsible for the discrepancy.

  12. IBM and Energy Efficiency: Systems Recommisiong and Optimization 

    E-Print Network [OSTI]

    Veilleux, Y.; Boulianne, J. P.; Lefebvre, P.

    2013-01-01

    and revision of calibration process; and Tuning of PID control loops. IBM Bromont Manufacturing Plant IBM and Energy Efficiency - Recommissioning: Improving Buildings Systems Efficiency ? 2013 IBM Corporation8 Boilers: Steam pressure optimization Before.... The recommissioning and optimization program for the HVAC systems was established and based on the following activities: IBM Bromont Recommissioning Program: HVAC HVAC Systems Optimization Key Activities IBM Bromont Manufacturing Plant IBM and Energy Efficiency...

  13. STOCHASTIC MODE REDUCTION FOR PARTICLE-BASED SIMULATION METHODS FOR COMPLEX MICROFLUID SYSTEMS

    E-Print Network [OSTI]

    Kramer, Peter

    STOCHASTIC MODE REDUCTION FOR PARTICLE-BASED SIMULATION METHODS FOR COMPLEX MICROFLUID SYSTEMS (DPD) simulation approaches for complex microfluid systems. The resulting coarse-grained dynamics

  14. Simulating the Dynamic Coupling of Market and Physical System Operations

    SciTech Connect (OSTI)

    Widergren, Steven E.; Roop, Joseph M.; Guttromson, Ross T.; Huang, Zhenyu

    2004-06-01

    Abstract-As energy trading products cover shorter time periods and demand response programs move toward real-time pricing, financial market-based activity impacts ever more directly the physical operation of the system. To begin to understand the complex interactions between the market-driven operation signals, the engineered controlled schemes, and the laws of physics, new system modeling and simulation techniques must be explored. This discussion describes requirements for new simulation tools to address such market transaction control interactions and an approach to capture the dynamic coupling between energy markets and the physical operation of the power system appropriate for dispatcher reaction time frames.

  15. Dynamic Simulation of Nuclear Hydrogen Production Systems

    E-Print Network [OSTI]

    in a hydrogen plant. The resulting system is tightly interconnected and operates at very high temperature connecting a nuclear reactor and a hydrogen production plant. This heat transfer loop uses helium as the heat scenarios. The first contribution of this thesis is a novel equation-based model for the heat transfer loop

  16. Co-Simulation Tools for Networked Control Systems

    E-Print Network [OSTI]

    Branicky, Michael S.

    , unmanned vehicles, home robotics, distributed virtual environments, power distribution, and building-simulation. The first two tools are extensions to ns-2 called Agent/Plant and NSCSPlant; the third tool integrates and control of the physical world. (right) A networked control system with one controlled system (a.k.a. plant

  17. Aircraft AC Generators: Hybrid System Modeling and Simulation

    E-Print Network [OSTI]

    Koutsoukos, Xenofon D.

    generator, phase-domain model, synchronous AC generator. I. INTRODUCTION The Integrated Drive Generator (IDG1 Aircraft AC Generators: Hybrid System Modeling and Simulation Ashraf Tantawy, Student Member--Integrated Drive Generators (IDGs) are the main source of electrical power for a number of critical systems

  18. HVAC's Variable Refrigerant Flow (VRF) Technology 

    E-Print Network [OSTI]

    Jones, S.

    2012-01-01

    Ducted Units Ceiling Suspended Floor Standing 27 VRF Energy-Efficiency and Environmental Impact Utilizing VRF with LEED ? Energy and Atmosphere: VRF can achieve up to 21 points ? Environmental Quality: VRF can achieve up to seven... points LEED NC 3.0 ? Certified: 40-49 points ? Silver: 50-59 points ? Gold: 60-79 points ? Platinum: 80 + points 29 VRF Systems and Energy Modeling ? Energy usage and cost for the VRF systems can be modeled using EnergyPro EnergyPro uses...

  19. Research & Development Roadmap: Emerging HVAC Technologies | Department of

    Energy Savers [EERE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousMathematicsEnergyInterestedReplacement-2-A Wholesale Power RateEnergySection 1222Energy HVAC

  20. Simulating sensorimotor systems with cortical topology 

    E-Print Network [OSTI]

    Saxon, James Bennett

    1991-01-01

    . Below, we begin with the thought-scape, giving an example of a neural network focused upon the immediate circumstances and then continue through the slower changing timescapes, giving examples as we go. 2. 1. 1. Thought-scapes, Type 111 Intelligent... with their external world. It comes at this issue from three different directions: the theoretical, the computational, and the empirical. We first focus on robot arm/robot eye sensorimotor systems by categorizing pre- vious work into a theoretical timescape...

  1. High Frequency Mechanical Pyroshock Simulations for Payload Systems

    SciTech Connect (OSTI)

    BATEMAN,VESTA I.; BROWN,FREDERICK A.; CAP,JEROME S.; NUSSER,MICHAEL A.

    1999-12-15

    Sandia National Laboratories (SNL) designs mechanical systems with components that must survive high frequency shock environments including pyrotechnic shock. These environments have not been simulated very well in the past at the payload system level because of weight limitations of traditional pyroshock mechanical simulations using resonant beams and plates. A new concept utilizing tuned resonators attached to the payload system and driven with the impact of an airgun projectile allow these simulations to be performed in the laboratory with high precision and repeatability without the use of explosives. A tuned resonator has been designed and constructed for a particular payload system. Comparison of laboratory responses with measurements made at the component locations during actual pyrotechnic events show excellent agreement for a bandwidth of DC to 4 kHz. The bases of comparison are shock spectra. This simple concept applies the mechanical pyroshock simulation simultaneously to all components with the correct boundary conditions in the payload system and is a considerable improvement over previous experimental techniques and simulations.

  2. Final Technical Report "Multiscale Simulation Algorithms for Biochemical Systems"

    SciTech Connect (OSTI)

    Petzold, Linda R.

    2012-10-25

    Biochemical systems are inherently multiscale and stochastic. In microscopic systems formed by living cells, the small numbers of reactant molecules can result in dynamical behavior that is discrete and stochastic rather than continuous and deterministic. An analysis tool that respects these dynamical characteristics is the stochastic simulation algorithm (SSA, Gillespie, 1976), a numerical simulation procedure that is essentially exact for chemical systems that are spatially homogeneous or well stirred. Despite recent improvements, as a procedure that simulates every reaction event, the SSA is necessarily inefficient for most realistic problems. There are two main reasons for this, both arising from the multiscale nature of the underlying problem: (1) stiffness, i.e. the presence of multiple timescales, the fastest of which are stable; and (2) the need to include in the simulation both species that are present in relatively small quantities and should be modeled by a discrete stochastic process, and species that are present in larger quantities and are more efficiently modeled by a deterministic differential equation (or at some scale in between). This project has focused on the development of fast and adaptive algorithms, and the fun- damental theory upon which they must be based, for the multiscale simulation of biochemical systems. Areas addressed by this project include: (1) Theoretical and practical foundations for ac- celerated discrete stochastic simulation (tau-leaping); (2) Dealing with stiffness (fast reactions) in an efficient and well-justified manner in discrete stochastic simulation; (3) Development of adaptive multiscale algorithms for spatially homogeneous discrete stochastic simulation; (4) Development of high-performance SSA algorithms.

  3. Simulation and simplified design studies of photovoltaic systems

    SciTech Connect (OSTI)

    Evans, D.L.; Facinelli, W.A.; Koehler, L.P.

    1980-09-01

    Results of TRNSYS simulations of photovoltaic systems with electrical storage are described. Studies of the sensitivity of system performance, in terms of the fraction of the electrical load supplied by the solar energy system, to variables such as array size, battery size, location, time of year, and load shape are reported. An accurate simplified method for predicting array output of max-power photovoltaic systems is presented. A second simplified method, which estimates the overall performance of max-power systems, is developed. Finally, a preliminary technique for predicting clamped-voltage system performance is discussed.

  4. Building America Webinar: High Performance Space Conditioning Systems, Part II

    Broader source: Energy.gov [DOE]

    The webinar on Nov. 18, 2014, continued the series on strategies to improve the performance of HVAC systems for low load homes and home performance retrofits.

  5. Building America Webinar: High Performance Space Conditioning Systems, Part I

    Broader source: Energy.gov [DOE]

    The webinar on Oct. 23, 2014 focused on strategies to improve the performance of HVAC systems for low load homes and home performance retrofits.

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

    SciTech Connect (OSTI)

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

    2011-04-01

    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.

  7. Fouling of HVAC fin and tube heat exchangers

    SciTech Connect (OSTI)

    Siegel, Jeffrey; Carey, Van P.

    2001-07-01

    Fin and tube heat exchangers are used widely in residential, commercial and industrial HVAC applications. Invariably, indoor and outdoor air contaminants foul these heat exchangers. This fouling can cause decreased capacity and efficiency of the HVAC equipment as well as indoor air quality problems related to microbiological growth. This paper describes laboratory studies to investigate the mechanisms that cause fouling. The laboratory experiments involve subjecting a 4.7 fins/cm (12 fins/inch) fin and tube heat exchanger to an air stream that contains monodisperse particles. Air velocities ranging from 1.5-5.2 m/s (295 ft/min-1024 ft/min) and particle sizes from 1--8.6 {micro}m are used. The measured fraction of particles that deposit as well as information about the location of the deposited material indicate that particles greater than about 1 {micro}m contribute to fouling. These experimental results are used to validate a scaling analysis that describes the relative importance of several deposition mechanisms including impaction, Brownian diffusion, turbophoresis, thermophoresis, diffusiophoresis, and gravitational settling. The analysis is extended to apply to different fin spacings and particle sizes typical of those found in indoor air.

  8. Interactive long-term simulation for power system restoration planning

    SciTech Connect (OSTI)

    Fountas, N.A.; Hatziargyriou, N.D. [National Technical Univ., Athens (Greece)] [National Technical Univ., Athens (Greece); Orfanogiannis, C.; Tasoulis, A. [Public Power Corp., Athens (Greece)] [Public Power Corp., Athens (Greece)

    1997-02-01

    The problem of restoring a power system following a complete blackout is complex and multi-faceted. Many control actions have to be performed on time, while constraints such as power balance and system stability have to be carefully respected. In this paper, the application of long-term dynamic analysis in studying frequency and voltage responses due to load and generation mismatches in isolated systems or during extension of the existing system in the restoration phase is presented. Simulation results covering the main steps of the Hellenic power system restoration process following a recent total blackout are presented and discussed.

  9. Diagnosis of Effectiveness of HVAC System and Energy Performance of Osaka-Gas Building through Retro-Commissioning Part 2 Handling the Data Produced by BEMS and Some Results of Analyses 

    E-Print Network [OSTI]

    Yamaha, M.; Ando,T.

    2014-01-01

    Syst.-Tech Nagoya, Japan 1 ESL-IC-14-09-17a Proceedings of the 14th International Conference for Enhanced Building Operations, Beijing, China, September 14-17, 2014 Outlines • Description of the system • Performance indices for co-generation • Data... properties from BEMS • Results • Conclusions 2 ESL-IC-14-09-17a Proceedings of the 14th International Conference for Enhanced Building Operations, Beijing, China, September 14-17, 2014 Description of the system 3 R1 R2 Waste heat recovery type absorption...

  10. Acceleration of the matrix multiplication of Radiance three phase daylighting simulations with parallel computing on heterogeneous hardware of personal computer

    SciTech Connect (OSTI)

    University of Miami; Zuo, Wangda; McNeil, Andrew; Wetter, Michael; Lee, Eleanor S.

    2013-04-30

    Building designers are increasingly relying on complex fenestration systems to reduce energy consumed for lighting and HVAC in low energy buildings. Radiance, a lighting simulation program, has been used to conduct daylighting simulations for complex fenestration systems. Depending on the configurations, the simulation can take hours or even days using a personal computer. This paper describes how to accelerate the matrix multiplication portion of a Radiance three-phase daylight simulation by conducting parallel computing on heterogeneous hardware of a personal computer. The algorithm was optimized and the computational part was implemented in parallel using OpenCL. The speed of new approach was evaluated using various daylighting simulation cases on a multicore central processing unit and a graphics processing unit. Based on the measurements and analysis of the time usage for the Radiance daylighting simulation, further speedups can be achieved by using fast I/O devices and storing the data in a binary format.

  11. A flexible system for the simulation of turbocharged diesel engines and turbocharging systems

    SciTech Connect (OSTI)

    Bulaty, T.; Codan, E.; Skopil, M.

    1996-12-31

    A fully flexible simulation system enables substitution of the conventional tests performed on turbocharged diesel engines. The supercharging systems can be calculated either by filling and emptying or by the differential method for 1-D unsteady flow during steady-state or transient operation. During sophisticated simulations, some conservation problems were observed. Their theoretical explanation and a practical solution are presented.

  12. Joint HVAC transmission EMF environmental study

    SciTech Connect (OSTI)

    Stormshak, F.; Thompson, J. (Oregon State Univ., Corvallis, OR (United States))

    1992-05-01

    This document describes the rationale, procedures, and results of a carefully controlled study conducted to establish whether chronic exposure of female (ewe) Suffolk lambs to the environment of a 500-kV 60-Hz transmission line would affect various characteristics of growth, endocrine function, and reproductive development. This experiment used identical housing and management schemes for control and line-exposed ewes, thus minimizing these factors as contributors to between-group experimental error. Further, throughout the 10-month duration of this study, changes in electric and magnetic fields, audible noise, and weather conditions were monitored continuously by a computerized system. Such measurements provided the opportunity to identify any relationship between environmental factors and biological responses. Because of reports in the literature that electric and magnetic fields alter concentrations of melatonin in laboratory animals, the primary objective of this study was to ascertain whether a similar effect occurs in lambs exposed to a 500-kV a-c line in a natural setting. In addition, onset of puberty, changes in body weight, wool growth, and behavior were monitored. To determine whether the environment of a 500-kV line caused stress in the study animals, serum levels of cortisol were measured. The study was conducted at Bonneville Power Administration's Ostrander Substation near Estacada, Oregon.

  13. Simulated, Emulated, and Physical Investigative Analysis (SEPIA) of networked systems.

    SciTech Connect (OSTI)

    Burton, David P.; Van Leeuwen, Brian P.; McDonald, Michael James; Onunkwo, Uzoma A.; Tarman, Thomas David; Urias, Vincent E.

    2009-09-01

    This report describes recent progress made in developing and utilizing hybrid Simulated, Emulated, and Physical Investigative Analysis (SEPIA) environments. Many organizations require advanced tools to analyze their information system's security, reliability, and resilience against cyber attack. Today's security analysis utilize real systems such as computers, network routers and other network equipment, computer emulations (e.g., virtual machines) and simulation models separately to analyze interplay between threats and safeguards. In contrast, this work developed new methods to combine these three approaches to provide integrated hybrid SEPIA environments. Our SEPIA environments enable an analyst to rapidly configure hybrid environments to pass network traffic and perform, from the outside, like real networks. This provides higher fidelity representations of key network nodes while still leveraging the scalability and cost advantages of simulation tools. The result is to rapidly produce large yet relatively low-cost multi-fidelity SEPIA networks of computers and routers that let analysts quickly investigate threats and test protection approaches.

  14. An Integrated Measurement to Road Vibration Simulation System

    E-Print Network [OSTI]

    Birdsong, Charles

    An Integrated Measurement to Road Vibration Simulation System Charles Birdsong, Ph.D. Dactron Inc and replication of vibrations for product testing. Important issues such as data verification, compensation for vibrations measured on a Jeep, compensated, and replicated on an electrodynamic shaker. Introduction

  15. Applications of Ontologies for Assembling Simulation Models of Industrial Systems

    E-Print Network [OSTI]

    industrial plant man- ually, which is time-consuming and error-prone. We propose to use a semi-automated models, industrial automation, SPARQL querying, design and integration 1 Introduction Modern industrialApplications of Ontologies for Assembling Simulation Models of Industrial Systems Petr Nov´ak1

  16. Three-Dimensional Magnetohydrodynamic Simulation of Slapper Initiation Systems

    SciTech Connect (OSTI)

    Christensen, J S; Hrousis, C A

    2010-03-09

    Although useful information can be gleaned from 2D and even 1D simulations of slapper type initiation systems, these systems are inherently three-dimensional and therefore require full 3D representation to model all relevant details. Further, such representation provides additional insight into optimizing the design of such devices from a first-principles perspective and can thereby reduce experimental costs. We discuss in this paper several ongoing efforts in modeling these systems, our pursuit of validation, and extension of these methods to other systems. Our results show the substantial dependence upon highly accurate global equations of state and resistivity models in these analyses.

  17. Building America Expert Meeting Report: Transitioning Traditional HVAC Contractors to Whole House Performance Contractors

    SciTech Connect (OSTI)

    Burdick, A.

    2011-10-01

    This report outlines findings resulting from a U.S. Department of Energy Building America expert meeting to determine how HVAC companies can transition from a traditional contractor status to a service provider for whole house energy upgrade contracting. IBACOS has embarked upon a research effort under the Building America Program to understand business impacts and change management strategies for HVAC companies. HVAC companies can implement these strategies in order to quickly transition from a 'traditional' heating and cooling contractor to a service provider for whole house energy upgrade contracting. Due to HVAC service contracts, which allow repeat interaction with homeowners, HVAC companies are ideally positioned in the marketplace to resolve homeowner comfort issues through whole house energy upgrades. There are essentially two primary ways to define the routes of transition for an HVAC contractor taking on whole house performance contracting: (1) Sub-contracting out the shell repair/upgrade work; and (2) Integrating the shell repair/upgrade work into their existing business. IBACOS held an Expert Meeting on the topic of Transitioning Traditional HVAC Contractors to Whole House Performance Contractors on March 29, 2011 in San Francisco, CA. The major objectives of the meeting were to: Review and validate the general business models for traditional HVAC companies and whole house energy upgrade companies Review preliminary findings on the differences between the structure of traditional HVAC Companies and whole house energy upgrade companies Seek industry input on how to structure information so it is relevant and useful for traditional HVAC contractors who are transitioning to becoming whole house energy upgrade contractors Seven industry experts identified by IBACOS participated in the session along with one representative from the National Renewable Energy Laboratory (NREL). The objective of the meeting was to validate the general operational profile of an integrated whole house performance contracting company and identify the most significant challenges facing a traditional HVAC contractor looking to transition to a whole house performance contractor. To facilitate the discussion, IBACOS divided the business operations profile of a typical integrated whole house performance contracting company (one that performs both HVAC and shell repair/upgrade work) into seven Operational Areas with more detailed Business Functions and Work Activities falling under each high-level Operational Area. The expert panel was asked to review the operational profile or 'map' of the Business Functions. The specific Work Activities within the Business Functions identified as potential transition barriers were rated by the group relative to the value in IBACOS creating guidance ensuring a successful transition and the relative difficulty in executing.

  18. Simulated performance of a position sensitive radiation detecting system (COCAE)

    E-Print Network [OSTI]

    K. Karafasoulis; K. Zachariadou; S. Seferlis; I. Kaissas; C. Lambropoulos; D. Loukas; C. Poritiriadis

    2011-01-20

    Extensive simulations of a portable radiation detecting system have been performed in order to explore important performance parameters. The instrument consists of a stack of ten detecting layers made of pixelated Cadmium Telluride (CdTe) crystals. Its aim is to localize and identify radiation sources, by exploiting the Compton imaging technique. In this paper we present performance parameters based on simulation studies. Specifically the ratio of incompletely absorbed photons, the detector's absolute efficiency as well as its energy and angular resolution are evaluated in a wide range of incident photon energies.

  19. Big Data Visual Analytics for Exploratory Earth System Simulation Analysis

    SciTech Connect (OSTI)

    Steed, Chad A. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Ricciuto, Daniel M. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Shipman, Galen M. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Smith, Brian E. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Thornton, Peter E. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Wang, Dali [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Shi, Xiaoying [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Williams, Dean N. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

    2013-12-01

    Rapid increases in high performance computing are feeding the development of larger and more complex data sets in climate research, which sets the stage for so-called big data analysis challenges. However, conventional climate analysis techniques are inadequate in dealing with the complexities of today s data. In this paper, we describe and demonstrate a visual analytics system, called the Exploratory Data analysis ENvironment (EDEN), with specific application to the analysis of complex earth system simulation data sets. EDEN represents the type of interactive visual analysis tools that are necessary to transform data into insight, thereby improving critical comprehension of earth system processes. In addition to providing an overview of EDEN, we describe real-world studies using both point ensembles and global Community Land Model Version 4 (CLM4) simulations.

  20. Direct Monte Carlo simulation of chemical reaction systems: Dissociation and recombination

    E-Print Network [OSTI]

    Anderson, James B.

    Direct Monte Carlo simulation of chemical reaction systems: Dissociation and recombination Shannon Carlo simulations of a chemical reaction system with bimolecular and termolecular dissociation­8 to be well suited for treating chemical reaction systems with nonequilibrium distributions, coupled gas

  1. Generic solar photovoltaic system dynamic simulation model specification.

    SciTech Connect (OSTI)

    Ellis, Abraham; Behnke, Michael Robert; Elliott, Ryan Thomas

    2013-10-01

    This document is intended to serve as a specification for generic solar photovoltaic (PV) system positive-sequence dynamic models to be implemented by software developers and approved by the WECC MVWG for use in bulk system dynamic simulations in accordance with NERC MOD standards. Two specific dynamic models are included in the scope of this document. The first, a Central Station PV System model, is intended to capture the most important dynamic characteristics of large scale (> 10 MW) PV systems with a central Point of Interconnection (POI) at the transmission level. The second, a Distributed PV System model, is intended to represent an aggregation of smaller, distribution-connected systems that comprise a portion of a composite load that might be modeled at a transmission load bus.

  2. POEM: Power-efficient Occupancy-based Energy Management System

    E-Print Network [OSTI]

    Cerpa, Alberto E.

    is electrical energy [1]. Of this total, 50% of the energy consumed in buildings is used for heating, air-conditioningPOEM: Power-efficient Occupancy-based Energy Management System Varick L. Erickson Elect. Eng for Heating Ventilation and Air-Conditioning (HVAC) systems. Current HVAC systems only condition based

  3. Particle loading rates for HVAC filters, heat exchangers, and ducts Nomenclature

    E-Print Network [OSTI]

    Siegel, Jeffrey

    particle mass emission rate distribution func- tion for resuspension (mg/lm h) Es particle mass emission The results in this paper suggest important factors that lead to particle deposition on HVAC components

  4. What are the Best HVAC Solutions for Low-Load, High Performance Homes?"

    Broader source: Energy.gov [DOE]

    This presentation was given at the Summer 2012 DOE Building America meeting on July 26, 2012, and addressed the question ŤWhat are the best HVAC solutions for low-load, high performance homes?"

  5. Flexibility of Commercial Building HVAC Fan as Ancillary Service for Smart Grid

    E-Print Network [OSTI]

    Maasoumy, Mehdi

    2013-01-01

    controlled loads for ancillary services,” in Proc. PSCC,P. Barooah, and S. Meyn, “Ancillary service for the grid viaBuilding HVAC Fan as Ancillary Service for Smart Grid Mehdi

  6. Building America Expert Meeting Report. Transitioning Traditional HVAC Contractors to Whole House Performance Contractors

    SciTech Connect (OSTI)

    Burdick, Arlan

    2011-10-01

    This expert meeting was hosted by the IBACOS Building America research team to determine how HVAC companies can transition from a traditional contractor status to a service provider for whole house energy upgrade contracting.

  7. The Development of A Human Systems Simulation Laboratory: Strategic Direction

    SciTech Connect (OSTI)

    Jacques Hugo; Katya le Blanc; David Gertman

    2012-07-01

    The Human System Simulation Laboratory (HSSL) at the Idaho National Laboratory is one of few facilities of its kind that allows human factors researchers to evaluate various aspects of human performance and human system interaction for proposed reactor designs and upgrades. A basic system architecture, physical configuration and simulation capability were established to enable human factors researchers to support multiple, simultaneous simulations and also different power plant technologies. Although still evolving in terms of its technical and functional architecture, the HSSL is already proving its worth in supporting current and future nuclear industry needs for light water reactor sustainability and small modular reactors. The evolution of the HSSL is focused on continual physical and functional refinement to make it a fully equipped, reconfigurable facility where advanced research, testing and validation studies can be conducted on a wider range of reactor technologies. This requires the implementation of additional plant models to produce empirical research data on human performance with emerging human-system interaction technologies. Additional beneficiaries of this information include system designers and HRA practitioners. To ensure that results of control room crew studies will be generalizable to the existing and evolving fleet of US reactors, future expansion of the HSSL may also include other SMR plant models, plant-specific simulators and a generic plant model aligned to the current generation of pressurized water reactors (PWRs) and future advanced reactor designs. Collaboration with industry partners is also proving to be a vital component of the facility as this helps to establish a formal basis for current and future human performance experiments to support nuclear industry objectives. A long-range Program Plan has been developed for the HSSL to ensure that the facility will support not only the Department of Energy’s Light Water Reactor Sustainability Program, but also to provide human factors guidance for all future developments of the nuclear industry.

  8. Comparison of Building Energy Modeling Programs: HVAC Systems

    E-Print Network [OSTI]

    Zhou, Xin

    2014-01-01

    combustion turbine chiller; electric chiller chiller; Screwturbine chillers, and electric chillers. DeST has screw

  9. Unified HVAC and Refrigeration Control Systems for Small Footprint...

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

    Presentationname Benchmark Volttron on small devices Intel Next Unit of Computing (NUC) Raspberry Pi 2 BeagleBone Black 350 - 400 35 (85 fully loaded) 21...

  10. Using Energy Management Control Systems for HVAC Operational Diagnostics 

    E-Print Network [OSTI]

    Stum, K.

    1998-01-01

    unit (TU). If this is greater than 10% of the maximum box CFM rating, there may be a flow sensor or control loop malfunction. The moving average space temperature deviation is also hacked and can immediately detect when there is a problem...

  11. Fault Detection and Diagnosis in Building HVAC Systems

    E-Print Network [OSTI]

    Najafi, Massieh

    2010-01-01

    of outside air condition, occupant behavior, and buildingair condition and occupant behavior) and fault condition (

  12. Comparison of Building Energy Modeling Programs: HVAC Systems

    E-Print Network [OSTI]

    Zhou, Xin

    2014-01-01

    energy balance on the water and air sides of the air/watercurves and performed on the water and air side of thebalance on the water and outdoor air web-bulb air/water

  13. The Application of Ultraviolet Germicidal Technology in HVAC Systems 

    E-Print Network [OSTI]

    Taylor, M. J.

    2000-01-01

    ) filtration is another alternative. HEPA filters have the ability to intercept many fungal spores. However, they also intercept nutrients, and if damp, provide a site for the spores to grow and multiply. The spores may grow through the filter material..., releasing spores on the downstream side of the filter.12 The result is that the filter contributes to the increase in the number of spores in the occupied space rather than decreases them. HEPA filters are unable to remove viruses. Typical HEPA filters...

  14. Comparison of Control Strategies for Energy Efficient Building HVAC Systems

    E-Print Network [OSTI]

    Maasoumy, Mehdi; Sangiovanni-Vincentelli, Alberto

    2014-01-01

    transfer in rooms in the modelica buildings library. [18] A.Building models are first captured in Modelica [1]to leverage Modelica’s rich building component library and

  15. Software for fault detection in HVAC systems in commercial buildings

    E-Print Network [OSTI]

    Deshmukh, Suhrid Avinash

    2014-01-01

    The building sector of the United States currently consumes over 41% of the United States primary energy supply. Estimates suggest that between 5 and 30% of any building's annual energy consumption is unknowingly wasted ...

  16. Energy Efficient HVAC System for Distributed Cooling/Heating with

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:FinancingPetroleum12, 2015 Infographic courtesyEducation Data JamDepartment ofEEREPrecipitator

  17. Integration of HVAC System Design with Simplified Duct Distribution -

    Energy Savers [EERE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousMathematicsEnergy HeadquartersFuelBConservationEnergy5975-01 REPORTDepartmentMethodologyfrom

  18. Unified HVAC and Refrigeration Control Systems for Small Footprint Supermarkets

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousMathematics And Statistics » USAJobs Search USAJobs Search The jobs listedNuclear1 1DOE NuclearUnearthing for

  19. enVerid Systems - HVAC Load Reduction | Department of Energy

    Energy Savers [EERE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIX E LIST OFAMERICA'S FUTURE.EnergyWooden Rooftops |.doc�8 I N S P

  20. CLARREO shortwave observing system simulation experiments of the twenty-first century: Simulator design and implementation

    SciTech Connect (OSTI)

    Feldman, D.R.; Algieri, C.A.; Ong, J.R.; Collins, W.D.

    2011-04-01

    Projected changes in the Earth system will likely be manifested in changes in reflected solar radiation. This paper introduces an operational Observational System Simulation Experiment (OSSE) to calculate the signals of future climate forcings and feedbacks in top-of-atmosphere reflectance spectra. The OSSE combines simulations from the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report for the NCAR Community Climate System Model (CCSM) with the MODTRAN radiative transfer code to calculate reflectance spectra for simulations of current and future climatic conditions over the 21st century. The OSSE produces narrowband reflectances and broadband fluxes, the latter of which have been extensively validated against archived CCSM results. The shortwave reflectance spectra contain atmospheric features including signals from water vapor, liquid and ice clouds, and aerosols. The spectra are also strongly influenced by the surface bidirectional reflectance properties of predicted snow and sea ice and the climatological seasonal cycles of vegetation. By comparing and contrasting simulated reflectance spectra based on emissions scenarios with increasing projected and fixed present-day greenhouse gas and aerosol concentrations, we find that prescribed forcings from increases in anthropogenic sulfate and carbonaceous aerosols are detectable and are spatially confined to lower latitudes. Also, changes in the intertropical convergence zone and poleward shifts in the subsidence zones and the storm tracks are all detectable along with large changes in snow cover and sea ice fraction. These findings suggest that the proposed NASA Climate Absolute Radiance and Refractivity Observatory (CLARREO) mission to measure shortwave reflectance spectra may help elucidate climate forcings, responses, and feedbacks.

  1. A Study of mixing in computer simulated laminar flow systems 

    E-Print Network [OSTI]

    McFarland, Allison Anne

    1984-01-01

    1984 Major Subject: Chemical Engineering A STUDY OF MIXING IN COMPUTER SIMULATED LAMINAR FLOW SYSTEMS A Thesis by ALLISON ANNE MCFARLAND Approved as to style and content by: Gary B. Tatterson (Chairman) ries J. Glover (Member) A. Ted Watson...: Dr. Gary B. Tatterson Mixing is a process that reduces nonuniformities or gradients in composition, properties, or temperature of material in bulk. It is a basic part of many chemical engineering processes, yet the theoretical understanding...

  2. Vehicle & Systems Simulation & Testing | Department of Energy

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousMathematics And Statistics » USAJobs Search USAJobs SearchWater-SavingofCode& Systems Simulation &

  3. Waste simulant development for evaluation of LLW melter system technology

    SciTech Connect (OSTI)

    Shade, J.W.

    1994-05-25

    This document describes the LLW simulant compositions, basis for the simulants, and recipes for preparing nonradioactive simulants for LLW melter tests.

  4. Information Reuse and System Integration in the Development of a Hurricane Simulation System*

    E-Print Network [OSTI]

    Chen, Shu-Ching

    Information Reuse and System Integration in the Development of a Hurricane Simulation System* Shu@fiu.edu * ©©©© 2003 IEEE Abstract - This paper presents our effort in designing and implementing an advanced hurricane in hurricane study, our system assembles and utilizes information and techniques in a more flexible and robust

  5. Description of waste pretreatment and interfacing systems dynamic simulation model

    SciTech Connect (OSTI)

    Garbrick, D.J.; Zimmerman, B.D.

    1995-05-01

    The Waste Pretreatment and Interfacing Systems Dynamic Simulation Model was created to investigate the required pretreatment facility processing rates for both high level and low level waste so that the vitrification of tank waste can be completed according to the milestones defined in the Tri-Party Agreement (TPA). In order to achieve this objective, the processes upstream and downstream of the pretreatment facilities must also be included. The simulation model starts with retrieval of tank waste and ends with vitrification for both low level and high level wastes. This report describes the results of three simulation cases: one based on suggested average facility processing rates, one with facility rates determined so that approximately 6 new DSTs are required, and one with facility rates determined so that approximately no new DSTs are required. It appears, based on the simulation results, that reasonable facility processing rates can be selected so that no new DSTs are required by the TWRS program. However, this conclusion must be viewed with respect to the modeling assumptions, described in detail in the report. Also included in the report, in an appendix, are results of two sensitivity cases: one with glass plant water recycle steams recycled versus not recycled, and one employing the TPA SST retrieval schedule versus a more uniform SST retrieval schedule. Both recycling and retrieval schedule appear to have a significant impact on overall tank usage.

  6. Co-Simulation of Building Energy and Control Systems with the Building

    E-Print Network [OSTI]

    LBNL-5065E Co-Simulation of Building Energy and Control Systems with the Building Controls Virtual Simulation, 4(3):185-203, 2011. Co-Simulation of Building Energy and Control Systems with the Building the run-time coupling of different simulation programs for data exchange, including EnergyPlus, MATLAB

  7. A Virtual Engineering Framework for Simulating Advanced Power System

    SciTech Connect (OSTI)

    Mike Bockelie; Dave Swensen; Martin Denison; Stanislav Borodai

    2008-06-18

    In this report is described the work effort performed to provide NETL with VE-Suite based Virtual Engineering software and enhanced equipment models to support NETL's Advanced Process Engineering Co-simulation (APECS) framework for advanced power generation systems. Enhancements to the software framework facilitated an important link between APECS and the virtual engineering capabilities provided by VE-Suite (e.g., equipment and process visualization, information assimilation). Model enhancements focused on improving predictions for the performance of entrained flow coal gasifiers and important auxiliary equipment (e.g., Air Separation Units) used in coal gasification systems. In addition, a Reduced Order Model generation tool and software to provide a coupling between APECS/AspenPlus and the GE GateCycle simulation system were developed. CAPE-Open model interfaces were employed where needed. The improved simulation capability is demonstrated on selected test problems. As part of the project an Advisory Panel was formed to provide guidance on the issues on which to focus the work effort. The Advisory Panel included experts from industry and academics in gasification, CO2 capture issues, process simulation and representatives from technology developers and the electric utility industry. To optimize the benefit to NETL, REI coordinated its efforts with NETL and NETL funded projects at Iowa State University, Carnegie Mellon University and ANSYS/Fluent, Inc. The improved simulation capabilities incorporated into APECS will enable researchers and engineers to better understand the interactions of different equipment components, identify weaknesses and processes needing improvement and thereby allow more efficient, less expensive plants to be developed and brought on-line faster and in a more cost-effective manner. These enhancements to APECS represent an important step toward having a fully integrated environment for performing plant simulation and engineering. Furthermore, with little effort the modeling capabilities described in this report can be extended to support other DOE programs, such as ultra super critical boiler development, oxy-combustion boiler development or modifications to existing plants to include CO2 capture and sequestration.

  8. Underfloor vs. overhead: a comparative analysis of air distribution systems using the EnergyPlus simulation software

    E-Print Network [OSTI]

    Daly, A.

    2006-01-01

    be able to address thermal stratification inside HVAC zones.Room Air Stratification Modeling Thermal plumes areof temperature stratification on thermal comfort in the

  9. Comparison Between TRNSYS Software Simulation and PV F-Chart Program on Photovoltaic System 

    E-Print Network [OSTI]

    Haberl, J. S.; Baltazar, J. C.; Mao, C.

    2012-01-01

    This report covers the comparisons of Photovoltaic System by TRNSYS simulation and PV F-Chart program to test TRNSYS simulation accuracy. The report starts with the Photovoltaic (PV) (PV) System introduction in Section one which is followed...

  10. Development of Design and Simulation Tool for Hybrid Geothermal Heat Pump System

    Broader source: Energy.gov [DOE]

    This project will expand Expand eQUEST, a building energy analysis software with latest implementation of DOE-2, for simulations of HGSHP systems and improve its existing simulation capabilities for ordinary GSHP systems.

  11. Systems and methods for controlling energy use in a building management system using energy budgets

    DOE Patents [OSTI]

    Wenzel, Michael J; Drees, Kirk H

    2014-09-23

    Systems and methods for limiting power consumption by a heating, ventilation, and air conditioning (HVAC) subsystem of a building are shown and described. A feedback controller is used to generate a manipulated variable based on an energy use setpoint and a measured energy use. The manipulated variable may be used for adjusting the operation of an HVAC device.

  12. Building HVAC Requirements Overview Page 4-1 4 Building HVAC Requirements

    E-Print Network [OSTI]

    heating, radiant floor systems, evaporative cooling, gas cooling, ground-source heat pumps, and wood space.1.1 Introduction and Organization This chapter addresses the requirements for heating, ventilating, and air the following topics: 1. Heating Equipment. The first section addresses the requirements for heating equipment

  13. Spreader-Bar Radiation Detection System Enhancements: A Modeling and Simulation Study

    SciTech Connect (OSTI)

    Ely, James H.; Ashbaker, Eric D.; Batdorf, Michael T.; Baciak, James E.; Hensley, Walter K.; Jarman, Kenneth D.; Robinson, Sean M.; Sandness, Gerald A.; Schweppe, John E.

    2012-11-13

    This report provides the modeling and simulation results of the investigation of enhanced spreader bar radiation detection systems.

  14. THE ROLE OF CLOUD MICROPHYSICS PARAMETERIZATION IN THE SIMULATION OF MESOSCALE CONVECTIVE SYSTEMS AND ANVIL

    E-Print Network [OSTI]

    THE ROLE OF CLOUD MICROPHYSICS PARAMETERIZATION IN THE SIMULATION OF MESOSCALE CONVECTIVE SYSTEMS in the Simulation of Mesoscale Convective Systems and Anvil Clouds in the Tropical Western Pacific K. Van Weverberg1 cloud microphysics in the simulation of mesoscale convective systems (MCSs) in the tropical western

  15. A simulator prototype for an ERP system Oscar Alfonso Caceres Mendoza

    E-Print Network [OSTI]

    A simulator prototype for an ERP system Oscar Alfonso Caceres Mendoza LYNGBY 2005 MASTER THESIS and application are both based on my professional interest in simulation modeling for ERP systems, as well as my of Enterprise Resource Planning (ERP) systems by adding a discrete event simulation application to the ERP

  16. A computer simulation of a generalized police patrol system 

    E-Print Network [OSTI]

    Dozier, Harold Wallace

    1975-01-01

    of barriers to travel FIGURE 14 ~ FIGURE 15. Examples of the use of linearized barriers to simulate a non-linear barrier. The points used in the array CARS to describe a patrol sector. 85 FIGURE 'l6. FIGURE 17. Example of data output from a trial... modifications. Though they do not realize it, , the public is also involved in these tests as it is their safety that is being tested. Some pre-screening of proposed mod- ification is called for to help identify system modifications that may prove unwise...

  17. Solar Event Simulations using the HAWC Scaler System

    E-Print Network [OSTI]

    Enriquez-Rivera, O; Caballero-Lopez, R

    2015-01-01

    The High Altitude Water Cherenkov (HAWC) Observatory is an air shower array located near the volcano Sierra Negra in Mexico. The observatory has a scaler system sensitive to low energy cosmic rays (the geomagnetic cutoff for the site is 8 GV) suitable for conducting studies of solar or heliospheric transients such as Ground Level Enhancements (GLEs) and Forbush decreases. In this work we present the simulation of the HAWC response to these phenomena. We computed HAWC effective areas for different array configurations (different selection of photomultiplier tubes per detector) relevant for Forbush decreases and GLEs.

  18. 1736 IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 51, NO. 10, OCTOBER 2003 Impulse Response of the HVAC Duct as a

    E-Print Network [OSTI]

    Stancil, Daniel D.

    of the HVAC Duct as a Communication Channel Pavel V. Nikitin, Member, IEEE, Daniel D. Stancil, Senior Member (HVAC) ducts in buildings behave as multimode waveguides when excited at radio frequencies and thus, can be used to distribute radio signals. The channel properties of the ducts are different from the properties

  19. LWR (Light Water Reactor) power plant simulations using the AD10 and AD100 systems

    SciTech Connect (OSTI)

    Wulff, W.; Cheng, H.S.; Chien, C.J.; Jang, J.Y.; Lin, H.C.; Mallen, A.N.; Wang, S.J. (Brookhaven National Lab., Upton, NY (USA); Institute of Nuclear Energy Research, Lung-Tan (Taiwan); Tawian Power Co., Taipei (Taiwan); Brookhaven National Lab., Upton, NY (USA); Institute of Nuclear Energy Research, Lung-Tan (Taiwan))

    1989-01-01

    Boiling (BWR) and Pressurized (PWR) Water Reactor Power Plants are being simulated at BNL with the AD10 and AD100 Peripheral Processor Systems. The AD10 system has been used for BWR simulations since 1984 for safety analyses, emergency training and optimization studies. BWR simulation capabilities have been implemented recently on the AD100 system and PWR simulation capabilities are currently being developed under the auspices of international cooperation. Modeling and simulation methods are presented with emphasis on the simulation of the Nuclear Steam Supply System. Results are presented for BWR simulation and performance characteristics are compared of the AD10 and AD100 systems. It will be shown that the AD100 simulates two times faster than two AD10 processors operating in parallel and that the computing capacity of one AD100 (with FMU processor) is twice as large as that of two AD10 processors. 9 refs., 5 figs., 1 tab.

  20. A Simulation Tool for Real-time Systems using Environmental Energy Harvesting Maryline CHETTO

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    A Simulation Tool for Real-time Systems using Environmental Energy Harvesting Maryline CHETTO, we present a simulation tool for real-time systems using environmental energy harvesting. Energy. The simulator enables to construct an optimal schedule for any task set, battery capacity and energy source

  1. A Scalable Parallel Monte Carlo Method for Free Energy Simulations of Molecular Systems

    E-Print Network [OSTI]

    Chan, Derek Y C

    A Scalable Parallel Monte Carlo Method for Free Energy Simulations of Molecular Systems MALEK O for problems where the energy dominates the entropy. An example is parallel tempering, in which simulations the free energy of the system as a direct output of the simulation. Traditional Metropolis MC samples phase

  2. Simulated watershed responses to land cover changes using the Regional Hydro-Ecological Simulation System

    E-Print Network [OSTI]

    Tarboton, David

    Simulated watershed responses to land cover changes using the Regional Hydro-Ecological Simulation Old Main Hill, Logan, UT, 84322-8200, USA Abstract: In this work, we used the Regional Hydro

  3. The simulation and analysis of continuous single product manufacturing systems 

    E-Print Network [OSTI]

    Snyder, Theodore Robert

    1974-01-01

    -My y kkN-, j+Mk+My s I s AREA II Table 3. 4 Continued (I & i & F) (j=F+I) P. . = (I-Pm) 1J [i/M] (i-(M-1)k) 1 I Mk k-o N-k Nk-i+Mk ( ) 1 (1 k )Mk-i+Mk- z=N-i-My 28 Area II represents the probabil1ty of enough failures occurr1ng to cause a... OF SCIENCE May 1974 Major Subject: Industrial Eng1neeri ng THE SIMULATION AND ANALYSIS OF CONTINUOUS SINGLE PRODUCT MANUFACTURING SYSTEMS A Thesis by THEODORE ROBERT SNYDER Approved as to sty1e and content by: rma of Commi ttee ead o D artment em...

  4. Performance comparison of U.K. low-energy cooling systems by energy simulation

    E-Print Network [OSTI]

    Olsen, Erik L. (Erik Lee), 1979-

    2002-01-01

    Building energy simulation is an important tool for evaluating the energy consumption of a building and can provide guidance in the design of a building and its mechanical systems. EnergyPlus is a new energy simulation ...

  5. Use of Building Automation System Trend Data for Inputs Generation in Bottom-Up Simulation Calibration 

    E-Print Network [OSTI]

    Zibin, N. F.; Zmeureanu, R. G.; Love, J. A.

    2013-01-01

    for analysis and use in simulation is very large. This paper explores automating the process of generating inputs from Building Automation System (BAS) trend data for use in building simulation software. A proof-of-concept prototype called the Automatic...

  6. A Partitioning Approach for Parallel Simulation of AC-Radial Shipboard Power Systems 

    E-Print Network [OSTI]

    Uriarte, Fabian Marcel

    2011-08-08

    An approach to parallelize the simulation of AC-Radial Shipboard Power Systems (SPSs) using multicore computers is presented. Time domain simulations of SPSs are notoriously slow, due principally to the number of components, ...

  7. A Co-simulation Approach for System-Level Analysis of Embedded Control Systems

    E-Print Network [OSTI]

    Teich, Jürgen

    by co-simulation: A SystemC-based virtual prototype of a distributed controller implementation is combined with high- level models of the plants specified in Matlab/Simulink. Through a model transformation., monetary costs, power consumption, or dependability. Design constraints are much more specific

  8. Lean NOx Trap Modeling in Vehicle Systems Simulations

    SciTech Connect (OSTI)

    Gao, Zhiming [ORNL] [ORNL; Chakravarthy, Veerathu K [ORNL] [ORNL; Daw, C Stuart [ORNL] [ORNL; Conklin, Jim [ORNL] [ORNL

    2010-09-01

    A one-dimensional model for simulating lean NOx trap (LNT) performance is developed and validated using both steady state cycling data and transient data from FTP testing cycles. The model consists of the conservation equations for chemical species and energy in the bulk flow, energy of the solid walls, O2 storage and NOx storage (in the form of nitrites and nitrates). Nitrites and nitrates are formed by diffusion of NO and NO2, respectively, into sorbent particles (assumed to be hemi-spherical in shape) along with O2 and their formation rates are controlled by chemical kinetics as well as solid-phase diffusion rates of NOx species. The model also accounts for thermal aging and sulfation of LNTs. Empirical correlations are developed on the basis of published experimental data to capture these effects. These empirical correlations depend on total mileage for which the LNT has been in use, the mileage accumulated since the last desulfation event in addition to the freshly degreened catalyst characteristics. The model has been used in studies of vehicle systems (integration, performance etc.) including hybrid powertrain configurations. Since the engines in hybrid vehicles turn on and off multiple number of times during single drive cycles, the exhaust systems may encounter multiple cold start transients. Accurate modeling of catalyst warm-up and cooling is, therefore, very important to simulate LNT performance in such vehicles. For this purpose, the convective heat loss from the LNT to the ambient is modeled using a Nusselt number correlation that includes effects of both forced convection and natural convection (with later being important when vehicle is stationary). Using the model, the fuel penalty associated with operating LNTs on small diesel engine powered car during FTP drive cycles is estimated.

  9. Thermal Storage with Conventional Cooling Systems 

    E-Print Network [OSTI]

    McGee, E. E.

    1990-01-01

    "Thermal Storage" is a term that describes a mechanical systems ability to sustain normal HVAC operations through a thermal retention source. This system allows for the curtailment of operating major refrigeration equipment during periods of high kw...

  10. Loop simulation capability for sodium-cooled systems

    E-Print Network [OSTI]

    Adekugbe, Oluwole A.

    1984-01-01

    A one-dimensional loop simulation capability has been implemented in the thermal-hydraulic analysis code, THERMIT-4E. This code had been used to simulate and investigate flow in test sections of experimental sodium loops ...

  11. Functional Mock-up Unit for Co-Simulation Import in EnergyPlus

    E-Print Network [OSTI]

    Nouidui, Thierry Stephane

    2014-01-01

    system and its controls in Modelica, export the HVAC systemsystem was implemented in Modelica and exported as an FMU.fraction). Figure 9 shows the Modelica implementation of the

  12. System Simulations of Hybrid Electric Vehicles with Focus on Emissions

    Broader source: Energy.gov [DOE]

    Comparative simulations of hybrid electric vehicles with gasoline and diesel engines will be conducted with focus on emissions control.

  13. Agent-Based Simulation of Distribution Systems with High Penetration of Photovoltaic Generation

    E-Print Network [OSTI]

    Tesfatsion, Leigh

    1 Agent-Based Simulation of Distribution Systems with High Penetration of Photovoltaic Generation- tems, photovoltaic generation, power distribution, power system economics, smart grids. I. INTRODUCTION study of electric distribution systems with high penetration of photovoltaic (PV) panels within

  14. Investigating Operating System Noise in Extreme-Scale High-Performance Computing Systems using Simulation

    SciTech Connect (OSTI)

    Engelmann, Christian

    2013-01-01

    Hardware/software co-design for future-generation high-performance computing (HPC) systems aims at closing the gap between the peak capabilities of the hardware and the performance realized by applications (application-architecture performance gap). Performance profiling of architectures and applications is a crucial part of this iterative process. The work in this paper focuses on operating system (OS) noise as an additional factor to be considered for co-design. It represents the first step in including OS noise in HPC hardware/software co-design by adding a noise injection feature to an existing simulation-based co-design toolkit. It reuses an existing abstraction for OS noise with frequency (periodic recurrence) and period (duration of each occurrence) to enhance the processor model of the Extreme-scale Simulator (xSim) with synchronized and random OS noise simulation. The results demonstrate this capability by evaluating the impact of OS noise on MPI_Bcast() and MPI_Reduce() in a simulated future-generation HPC system with 2,097,152 compute nodes.

  15. On theoretical issues of computer simulations sequential dynamical systems

    SciTech Connect (OSTI)

    Barrett, C.L.; Mortveit, H.S.; Reidys, C.M.

    1998-12-01

    The authors study a class of discrete dynamical systems that is motivated by the generic structure of simulations. The systems consist of the following data: (a) a finite graph Y with vertex set {l_brace}1,...,n{r_brace} where each vertex has a binary state, (b) functions F{sub i}:F{sub 2}{sup n} {r_arrow} F{sub 2}{sup n} and (c) an update ordering {pi}. The functions F{sub i} update the binary state of vertex i as a function of the state of vertex i and its Y-neighbors and leave the states of all other vertices fixed. The update ordering is a permutation of the Y-vertices. They derive a decomposition result, characterize invertible SDS and study fixed points. In particular they analyze how many different SDS that can be obtained by reordering a given multiset of update functions and give a criterion for when one can derive concentration results on this number. Finally, some specific SDS are investigated.

  16. Model Code for the Control of Residential HVAC Distribution System Leakage and HVAC-Induced Building Leakage 

    E-Print Network [OSTI]

    Wemhoff, P.

    1990-01-01

    , and nonmetallic flexible duct. Also addressed are (1) detailed requirements for the sealing of mechanical closets when they function as plenum chambers, (2) detailed requirements for the sealing of enclosed support platforms or air handlers and furnaces when...

  17. Climate Dynamics Diagnosis of the Marine Low Cloud Simulation in the NCAR Community Earth System

    E-Print Network [OSTI]

    Bretherton, Chris

    -of-the-art coupled atmosphere-ocean models: the NCAR Community Earth System Model (CESM) and the NCEP Global of the Marine Low Cloud Simulation in the NCAR1 Community Earth System Model (CESM) and the NCEP Global2Climate Dynamics Diagnosis of the Marine Low Cloud Simulation in the NCAR Community Earth System

  18. HYBRID GROUND SOURCE HEAT PUMP SYSTEM SIMULATION USING VISUAL MODELING TOOL FOR HVACSIM+

    E-Print Network [OSTI]

    HYBRID GROUND SOURCE HEAT PUMP SYSTEM SIMULATION USING VISUAL MODELING TOOL FOR HVACSIM+ M.H. Khan, 74078, USA ABSTRACT This paper presents a simulation of a hybrid ground source heat pump system, performed using a new graphical user interface for HVACSIM+. Hybrid ground source heat pump systems

  19. Simulating the Impact of a Carbon Market Electricity System in the Western U.S.A.

    E-Print Network [OSTI]

    Ford, Andrew

    , electricity markets, power plants, transmission network, renewable resources, system dynamics, computerSimulating the Impact of a Carbon Market on the Electricity System in the Western U.S.A. Andrew and trade market to control carbon emissions in the western electricity system. The simulations indicate

  20. Fouling of HVAC Fin and Tube Heat Exchangers Jeffrey Siegel and Van P. Carey

    E-Print Network [OSTI]

    LBNL-47668 Fouling of HVAC Fin and Tube Heat Exchangers Jeffrey Siegel and Van P. Carey FIN AND TUBE HEAT EXCHANGERS Jeffrey Siegel1,2 and Van P. Carey2 1 Lawrence Berkeley National, USA; E-mail: vcarey@euler.me.berkeley.edu ABSTRACT Fin and tube heat exchangers are used widely

  1. Building America Best Practices Series Volume 14 - HVAC. A Guide for Contractors to Share with Homeowners

    SciTech Connect (OSTI)

    Baechler, Michael C.; Gilbride, Theresa L.; Hefty, Marye G.; Hand, James R.; Love, Pat M.

    2011-08-01

    This guide, which is part of a series of Best Practices guides produced by DOE’s Building America program, describes ways homeowners can reduce their energy costs and improve the comfort, health, and safety of their homes by upgrading their heating, ventilation, and air conditioning (HVAC) equipment.

  2. Co-Simulation of Building Energy and Control Systems with the Building Controls Virtual Test Bed

    E-Print Network [OSTI]

    Wetter, Michael

    2012-01-01

    protocol for building automation and control networks, 2004.other. Interfaces to Building Automation Systems (BAS) arebuilding performance simulation environment for early design support. Automation

  3. Simulations of eccentric disks in close binary systems

    E-Print Network [OSTI]

    Wilhelm Kley; John Papaloizou; Gordon Ogilvie

    2008-06-24

    We study the development of finite eccentricity in accretion disks in close binary systems using a two-dimensional grid-based numerical scheme. We perform detailed parameter studies to explore the dependence on viscosity, disk aspect ratio, the inclusion of a mass-transfer stream and the role of the boundary conditions. We consider mass ratios 0.05systems. Instability to the formation of a precessing eccentric disk that attains a quasi-steady state with mean eccentricity in the range 0.3-0.5 occurs readily. The shortest growth times are ~15 binary orbits for the largest viscosities and the instability mechanism is for the most part consistent with the mode-coupling mechanism associated with the 3:1 resonance proposed by Lubow. However, the results are sensitive to the treatment of the inner boundary and to the incorporation of the mass-transfer stream. In the presence of a stream we found a critical viscosity below which the disk remains circular. Incorporation of a mass-transfer stream tends to impart stability for small enough viscosity (or, equivalently, mass-transfer rate through the disk) and does assist in obtaining a prograde precession rate that is in agreement with observations. For the larger q the location of the 3:1 resonance is pushed outwards towards the Roche lobe where higher-order mode couplings and nonlinearity occur. It is likely that three-dimensional simulations that properly resolve the disk's vertical structure are required to make significant progress in this case.

  4. New Automotive Air Conditioning System Simulation Tool Developed in MATLAB/Simulink

    SciTech Connect (OSTI)

    Kiss, T.; Chaney, L.; Meyer, J.

    2013-07-01

    Further improvements in vehicle fuel efficiency require accurate evaluation of the vehicle's transient total power requirement. When operated, the air conditioning (A/C) system is the largest auxiliary load on a vehicle; therefore, accurate evaluation of the load it places on the vehicle's engine and/or energy storage system is especially important. Vehicle simulation software, such as 'Autonomie,' has been used by OEMs to evaluate vehicles' energy performance. A transient A/C simulation tool incorporated into vehicle simulation models would also provide a tool for developing more efficient A/C systems through a thorough consideration of the transient A/C system performance. The dynamic system simulation software Matlab/Simulink was used to develop new and more efficient vehicle energy system controls. The various modeling methods used for the new simulation tool are described in detail. Comparison with measured data is provided to demonstrate the validity of the model.

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

    SciTech Connect (OSTI)

    Wray, Craig P.; Matson, Nance E.

    2003-10-01

    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.

  6. Long-term effects of anthropogenic CO2 emissions simulated with a complex earth system model

    E-Print Network [OSTI]

    Winguth, Arne

    Long-term effects of anthropogenic CO2 emissions simulated with a complex earth system model Uwe earth system model con- sisting of an atmospheric general circulation model, an ocean general

  7. Comparison Between TRNSYS Software Simulation and F-Chart Program on Solar Domestic Hot Water System 

    E-Print Network [OSTI]

    Haberl, J. S.; Baltazar, J. C.; Mao, C.

    2012-01-01

    This study presents the accuracy test of a TRNSYS Solar Domestic Hot Water (SDHW) System simulation. The testing is based on comparing the results with the F-Chart software. The selected system to carry out the tests was ...

  8. Vehicle Technologies Office: 2010 Vehicle and Systems Simulation and Testing R&D Annual Progress Report

    Broader source: Energy.gov [DOE]

    2010 annual report focusing on five main areas: modeling and simulation, component and systems evaluation, laboratory and field vehicle evaluation, codes and standards development, and heavy vehicle systems optimization.

  9. Vehicle Technologies Office: 2012 Vehicle and Systems Simulation and Testing R&D Annual Progress Report

    Office of Energy Efficiency and Renewable Energy (EERE)

    FY 2012 annual report focusing on five main areas: modeling and simulation, component and systems evaluation, laboratory and field vehicle evaluation, codes and standards development, and heavy vehicle systems optimization.

  10. Vehicle Technologies Office: 2011 Vehicle and Systems Simulation and Testing R&D Annual Progress Report

    Office of Energy Efficiency and Renewable Energy (EERE)

    FY 2011 annual report focusing on five main areas: modeling and simulation, component and systems evaluation, laboratory and field vehicle evaluation, codes and standards development, and heavy vehicle systems optimization.

  11. Vehicle Technologies Office: 2013 Vehicle and Systems Simulation and Testing R&D Annual Progress Report

    Office of Energy Efficiency and Renewable Energy (EERE)

    FY 2013 annual report focuses on the following areas: vehicle modeling and simulation, component and systems evaluations, laboratory and field evaluations, codes and standards, industry projects, and vehicle systems optimization.

  12. FY2013 Vehicle and Systems Simulation and Testing R&D Annual Progress Report

    SciTech Connect (OSTI)

    none,

    2014-02-01

    FY 2013 annual report focuses on the following areas: vehicle modeling and simulation, component and systems evaluations, laboratory and field evaluations, codes and standards, industry projects, and vehicle systems optimization.

  13. Simulation of e-cloud driven instability and its attenuation using a simulated feedback system in the CERN SPS

    SciTech Connect (OSTI)

    Vay, J.-L.; Furman, M. A.

    2010-12-13

    Electron clouds have been shown to trigger fast growing instabilities on proton beams circulating in the SPS, and a feedback system to control the single-bunch instabilities is under active development. We present the latest improvements to the WARP-POSINST simulation framework and feedback model, and its application to the self-consistent simulations of two consecutive bunches interacting with an electron cloud in the SPS. Simulations using an idealized feedback system exhibit adequate mitigation of the instability providing that the cutoff of the feedback bandwidth is at or above 450 MHz. Artifacts from numerical noise of the injected distribution of electrons in the modeling of portions of bunch trains are discussed, and benchmarking of WARP against POSINST and HEADTAIL are presented.

  14. Numerical simulation of flow and mixing behavior of solids on a moving grate combustion system

    E-Print Network [OSTI]

    Columbia University

    Numerical simulation of flow and mixing behavior of solids on a moving grate combustion system by #12;ii Numerical simulation of flow and mixing behavior of solids on a moving grate combustion system, and to a large extent influences the combustion process. Municipal solid waste (MSW) is not a uniform fuel

  15. A PRODUCTION SIMULATION TOOL FOR SYSTEMS WITH INTEGRATED WIND ENERGY RESOURCES

    E-Print Network [OSTI]

    Gross, George

    A PRODUCTION SIMULATION TOOL FOR SYSTEMS WITH INTEGRATED WIND ENERGY RESOURCES BY NICOLAS BENOIT of renewable energy sources in order to reduce CO2 emissions. In fact, several jurisdictions around the world production simulation tool with the capability to quantify the variable effects of systems with varying wind

  16. Experimental Study of a Cooling Coil and the Validation of its Simulation Model for the Purpose of Commissioning 

    E-Print Network [OSTI]

    Yamaguchi, H.; Miyata, M.; Oda, H.; Shioya, M.; Watanabe, T.; Niwa, H.; Yoshida, H.

    2006-01-01

    For HVAC system commissioning, it is important to evaluate the performance of the cooling coil in an air-handling unit. However, manual evaluation requires a great deal of time and effort. One solution is to predict the coil performance...

  17. Improving Energy Efficiency by Developing Components for Distributed Cooling and Heating Based on Thermal Comfort Modeling[Thermoelectric (TE) HVAC

    Broader source: Energy.gov [DOE]

    Discusses results from TE HVAC project to add detail to a human thermal comfort model and further allow load reduction in the climate control energy through a distributed TE network

  18. Simulating a storage-production system with three oilseed crops

    E-Print Network [OSTI]

    Figer, Luiz

    2012-01-01

    This work developed a simulation model that is intended to be used for strategic investment decisions by a company that operates in a wide range of activities in the agriculture business in Brazil. Mostly, it is a tool ...

  19. Causes of variation in soil carbon simulations from CMIP5 Earth system models and comparison with observations

    E-Print Network [OSTI]

    2013-01-01

    and benchmarks in Earth system models sitivity of the Amazonand benchmarks in Earth system models Thornton, P. E. ,simulations from CMIP5 Earth system models and comparison

  20. Fouling of HVAC fin and tube heat exchangers

    E-Print Network [OSTI]

    Siegel, Jeffrey; Carey, Van P.

    2001-01-01

    Vol. 42, pp. 943-945. Muyshondt, A. , Nutter, D. and Gordon,of electric air cleaners. Muyshondt et al. (1998) used adynamic simulations of Muyshondt et al. (1998). A rigorous

  1. Enhancing student learning of two-level quantum systems with interactive simulations

    E-Print Network [OSTI]

    Kohnle, Antje; Campbell, Anna; Korolkova, Natalia; Paetkau, Mark J

    2015-01-01

    The QuVis Quantum Mechanics Visualization project aims to address challenges of quantum mechanics instruction through the development of interactive simulations for the learning and teaching of quantum mechanics. In this article, we describe evaluation of simulations focusing on two-level systems developed as part of the Institute of Physics Quantum Physics resources. Simulations are research-based and have been iteratively refined using student feedback in individual observation sessions and in-class trials. We give evidence that these simulations are helping students learn quantum mechanics concepts at both the introductory and advanced undergraduate level, and that students perceive simulations to be beneficial to their learning.

  2. Best Practices for Energy Efficient Cleanrooms: Control of Chilled Water System

    E-Print Network [OSTI]

    : Control of chilled water system Tengfang Xu Contents HVAC WATER SYSTEMSLBNL-58635 Best Practices for Energy Efficient Cleanrooms: Control of Chilled Water System Tengfang.............................................................................................. 2 Control of chilled water system

  3. Improving Building Control and System Operation Through the Continuous Commissioning® Process: A Case Study 

    E-Print Network [OSTI]

    Redmann, N.; Liu, M.

    2003-01-01

    , and Energy Management and Control System (EMCS) functionality. It also aided in the identification of mechanical systems needing repair. The optimization of the HVAC systems and advanced utilization of the EMCS reduced the combined heating and cooling energy...

  4. Simulation of e-cloud driven instability and its attenuation using a simulated feedback system in the CERN SPS

    E-Print Network [OSTI]

    Vay, J.-L.

    2011-01-01

    bottom) from computer simulations of electron cloud drivenusing computer simulations of electron cloud buildup in the

  5. NUMERICAL SIMULATION OF RESERVOIR COMPACTION IN LIQUID DOMINATED GEOTHERMAL SYSTEMS

    E-Print Network [OSTI]

    Lippmann, M.J.

    2010-01-01

    modeling of liquid geothermal systems: Ph.D. thesis, Univ.IN LIQUID DOMINATED GEOTHERMAL SYSTEMS by M, J. Lippmann, T.IN LIQUID DOMINATED GEOTHERMAL SYSTEMS Marcelo J. Lippmann,

  6. A co-simulation framework for design of time-triggered automotive cyber physical systems

    E-Print Network [OSTI]

    Koutsoukos, Xenofon D.

    A co-simulation framework for design of time-triggered automotive cyber physical systems Zhenkai Automotive control system SystemC a b s t r a c t Designing cyber-physical systems (CPS) is challenging due to the tight interactions between software, network/platform, and physical components. Automotive control sys

  7. A software package for the graphical simulation of the Global Positioning System's satellite orbits 

    E-Print Network [OSTI]

    Martinez-Lopez, Eugenio

    1981-01-01

    A SOFTWARE PACKAGE FOR THE GRAPHICAL SIMULATION OF THE GLOBAL POSITIONING SYSTEM'S SATELLITE ORBITS A Thesis by EUGENIO MARTINEZ-LOPEZ Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement... for the degree of MASTER OF SCIENCE August 1981 Ma)or Subject: Electrical Engineering Copyright by Eugenio Martinez-Lopez, 1979 A SOFTWARE PACKAGE FOR THE GRAPHICAL SIMULATION OF THE GLOBAL POSITIONING SYSTEM&S SATELLITE ORBITS A Thesis by Eugenio...

  8. A Versatile and Powerful Simulator for Design, Advanced Control and Expert Systems 

    E-Print Network [OSTI]

    Schindler, H. E.; Leaver, E. W.; Shewchuk, C. F.

    1988-01-01

    , Ontario Canada ABSnACT The usefulness of models of plant utility systems largely depends on the capabilities of the process system simulator which uses them. SACDA has been engaged in a multi-year development of a versatile and powerful steady state... generalized simultaneous modular process simulation package for calculating the steady-state heat and mass balance for industrial processes. The system has been designed for the modelling of the operation of water-based processes such as those found...

  9. Interoperable simulation gaming for strategic infrastructure systems design

    E-Print Network [OSTI]

    Grogan, Paul Thomas, 1985-

    2014-01-01

    Infrastructure systems are large physical networks of interrelated components which produce and distribute resources to meet societal needs. Meeting future sustainability objectives may require more complex systems with ...

  10. Systems and methods for controlling energy use in a building management system using energy budgets

    SciTech Connect (OSTI)

    Wenzel, Michael J.

    2012-06-17

    Systems and methods for limiting power consumption by a heating, ventilation, and air conditioning (HVAC) subsystem of a building are shown and described. A mathematical linear operator is found that transforms the unused or deferred cooling power usage of the HVAC system based on pre-determined temperature settings to a target cooling power usage. The mathematical operator is applied to the temperature settings to create a temperature setpoint trajectory expected to provide the target cooling power usage.

  11. Using Simulation Models for District Chilled Water Distribution Systems Design 

    E-Print Network [OSTI]

    Chen, Q.; Xu, C.; Deng, S.; Claridge, D. E.; Turner, W. D.

    2004-01-01

    the design. The focus of this paper is to demonstrate how the using of the computerized simulation model can give the engineer the ability to explore many more alternative design scenarios and to identify more cost-effective and robust designs. The University...

  12. Parallelization of DQMC Simulation for Strongly Correlated Electron Systems

    E-Print Network [OSTI]

    California at Davis, University of

    with novelty by presenting a hybrid granularity parallelization (HGP) scheme that combines algo- rithmic, the HGP scheme explores the parallelism on different levels and maps the underlying algorithms onto and load balancing are also considered in the proposed HGP scheme. We have implemented the DQMC simulation

  13. SIMULATION OF A TIRE INSPECTION SYSTEM W. H. GRAY1

    E-Print Network [OSTI]

    Abidi, Mongi A.

    is a key component for efficient machine vision building. A quality control system by artificial vision when designing an inspection system based upon machine vision. The tire inspection system uses thermal. For any vision system, the placement of the camera(s) determines the effectiveness of the defect detection

  14. Unified System for Processing Real and Simulated Data in the ATLAS Experiment

    E-Print Network [OSTI]

    Borodin, Mikhail; Navarro, Jose Garcia; Golubkov, Dmitry; Klimentov, Alexei; Maeno, Tadashi; South, David

    2015-01-01

    The physics goals of the next Large Hadron Collider run include high precision tests of the Standard Model and searches for new physics. These goals require detailed comparison of data with computational models simulating the expected data behavior. To highlight the role which modeling and simulation plays in future scientific discovery, we report on use cases and experience with a unified system built to process both real and simulated data of growing volume and variety.

  15. Unified System for Processing Real and Simulated Data in the ATLAS Experiment

    E-Print Network [OSTI]

    Mikhail Borodin; Kaushik De; Jose Garcia Navarro; Dmitry Golubkov; Alexei Klimentov; Tadashi Maeno; David South; Alexandre Vaniachine on behalf of the ATLAS Collaboration

    2015-08-28

    The physics goals of the next Large Hadron Collider run include high precision tests of the Standard Model and searches for new physics. These goals require detailed comparison of data with computational models simulating the expected data behavior. To highlight the role which modeling and simulation plays in future scientific discovery, we report on use cases and experience with a unified system built to process both real and simulated data of growing volume and variety.

  16. A Multi-Agent Simulation System for Prediction and Scheduling of Aero Engine Overhaul

    E-Print Network [OSTI]

    Roberts, Stephen

    A Multi-Agent Simulation System for Prediction and Scheduling of Aero Engine Overhaul Armin Southampton SO17 1BJ, UK. {acr, pv}@ecs.soton.ac.uk ABSTRACT The Aero Repair and Overhaul industry is facing Experimentation Keywords Scheduling, negotiation, risk estimation, simulation, aero re- pair and overhaul, multi

  17. 1 Relaxing the Multivariate Normality Assumption in the Simulation 2 of Transportation System Dependencies

    E-Print Network [OSTI]

    Kockelman, Kara M.

    1 1 Relaxing the Multivariate Normality Assumption in the Simulation 2 of Transportation System network analysis literature is the3 use of the multivariate normal (MVN) distribution. While in certain to sample from these case-specific multivariate distributions in simulation studies (see, e.g.,14 Ghosh

  18. Bayesian-based simulation model validation for spacecraft thermal systems

    E-Print Network [OSTI]

    Stout, Kevin Dale

    2015-01-01

    Over the last several decades of space flight, spacecraft thermal system modeling software has advanced significantly, but the model validation process, in general, has changed very little. Although most thermal systems ...

  19. Tecnical Report CSTR0305 Advanced Life Support System Simulation

    E-Print Network [OSTI]

    Wu, Annie S.

    ; ~ o;~ a; ~ wg where: 2 #12; ~ e def = he energy ; e air:o2 ; e air:co2 ; e water:clean ; e water is the initial state of the simulation, C is the control strategy that defines a vector of control parameters asphyxiation i, vector of crew variables, ~ o def = ho status ; o energy ; o water ; o low:energy ; o low

  20. Vehicle Technologies Office Merit Review 2014: Vehicle & Systems Simulation

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousMathematics And Statistics » USAJobs Search USAJobsAdvanced Engine Combustion Simulation

  1. Global Evaluation of the ISBA-TRIP Continental Hydrological System. Part II: Uncertainties in River Routing Simulation Related to Flow

    E-Print Network [OSTI]

    Boyer, Edmond

    the entire globe. RRMs have been introduced into earth system models (ESMs) to convert the runoff simulated

  2. Simulation of a High Efficiency Multi-bed Adsorption Heat Pump

    SciTech Connect (OSTI)

    TeGrotenhuis, Ward E.; Humble, Paul H.; Sweeney, J. B.

    2012-05-01

    Attaining high energy efficiency with adsorption heat pumps is challenging due to thermodynamic losses that occur when the sorbent beds are thermally cycled without effective heat recuperation. The multi-bed concept described here effectively transfers heat from beds being cooled to beds being heated, which enables high efficiency in thermally driven heat pumps. A simplified lumped-parameter model and detailed finite element analysis are used to simulate the performance of an ammonia-carbon sorption compressor, which is used to project the overall heat pump coefficient of performance. The effects of bed geometry and number of beds on system performance are explored, and the majority of the performance benefit is obtained with four beds. Results indicate that a COP of 1.24 based on heat input is feasible at AHRI standard test conditions for residential HVAC equipment. When compared on a basis of primary energy input, performance equivalent to SEER 13 or 14 are theoretically attainable with this system.

  3. Integrating Solar Thermal and Photovoltaic Systems in Whole Building Energy Simulation 

    E-Print Network [OSTI]

    Cho, S.; Haberl, J.

    2010-01-01

    This paper introduces methodologies on how the renewable energy generated by the solar thermal and solar photovoltaic (PV) systems installed on site can be integrated in the whole building simulation analyses, which ...

  4. Geographic information system (GIS) and simulation model for management of irrigation districts 

    E-Print Network [OSTI]

    Nazarov, Azimjon S.

    2000-01-01

    . It consists of IRDDESS (Irrigation District Decision Support System), a crop growth and district simulation model that was integrated into ArcView GIS software. To demonstrate the usefulness of the model, its predictions were compared with those observed...

  5. Reliability Modeling and Simulation of Composite Power Systems with Renewable Energy Resources and Storage 

    E-Print Network [OSTI]

    Kim, Hagkwen

    2013-05-24

    This research proposes an efficient reliability modeling and simulation methodology in power systems to include photovoltaic units, wind farms and storage. Energy losses by wake effect in a wind farm are incorporated. Using the wake model, wind...

  6. Retro-Commissioning and Improvement for District Heating and Cooling System Using Simulation 

    E-Print Network [OSTI]

    Shingu, H.; Nakajima, R.; Yoshida, H.; Wang, F.

    2006-01-01

    In order to improve the energy performance of a district heating and cooling (DHC) system, retro-commissioning was analyzed using visualization method and simulation based on mathematical models, and improved operation schemes were proposed...

  7. American Institute of Aeronautics and Astronautics A Case Study of High Fidelity Engine System Simulation

    E-Print Network [OSTI]

    Cincinnati, University of

    Simulation Russell W. Claus,* Scott Townsend , Tom Lavelle , Cynthia Naiman§ , and Mark Turner** NASA Glenn detailed analysis of critical components or sub-systems and 4) a user-friendly run-time environment

  8. A Method for On-Going Commissioning of VRV Package Systems Using a Simulation Model 

    E-Print Network [OSTI]

    Yamaha, M.; Sekiyama, K.; Misaki, S.

    2006-01-01

    is not known. A simulation model based on a refrigeration cycle was proposed to evaluate system performance. Basic conditions for evaporation and condensation were defined from conditions provided in Japanese Industrial Standards (JIS). Flow rate of refrigerant...

  9. A digital autopilot simulator and advisory system for detecting off-nominal behavior 

    E-Print Network [OSTI]

    Bae, Han-Wook

    2002-01-01

    This thesis describes the development and the testing of an advisory system for a digital autopilot on the Space Shuttle. A simplified spacecraft attitude control simulator has also been developed and tested using real-time telemetry data...

  10. A Training Simulation System with Realistic Autonomous Ship Control Monica Nicolescu, Ryan Leigh, Adam Olenderski, Lt. Ryan Aleson (Retd.)

    E-Print Network [OSTI]

    Dascalu, Sergiu

    1 A Training Simulation System with Realistic Autonomous Ship Control Monica Nicolescu, Ryan Leigh In this paper we present a computational approach to developing effective training systems for virtual simulation environments. In particular, we focus on a Naval simulation system, used for training of conning

  11. A Reliable Web-based System for Hurricane Analysis and Simulation*

    E-Print Network [OSTI]

    Chen, Shu-Ching

    -related historical and simulated data. Keywords: System modeling and integration, information fusion, data management] at University of Oklahoma, the Colorado State University's Regional Atmospheric Modeling System (RAMS) [9 in the literature. However, in most of these existing systems, neither database management nor warehouse techniques

  12. Direct Monte Carlo simulation of chemical reaction systems: Simple bimolecular reactions

    E-Print Network [OSTI]

    Anderson, James B.

    Direct Monte Carlo simulation of chemical reaction systems: Simple bimolecular reactions Shannon D and understanding the behavior of gas phase chemical reaction systems. This Monte Carlo method, originated by Bird. Extension to chemical reactions offers a powerful tool for treating reaction systems with nonthermal

  13. Exploring the Dynamic Costs of Process-aware Information Systems through Simulation

    E-Print Network [OSTI]

    Ulm, Universität

    Exploring the Dynamic Costs of Process-aware Information Systems through Simulation Bela Mutschler systems, case handling systems) is associated with high costs. Though cost evaluation has received utilizes si- mulation models for investigating costs related to PAIS engineering projects. We motivate

  14. Building America Webinar: High Performance Space Conditioning Systems, Part II

    Broader source: Energy.gov [DOE]

    The webinar will continue our series on strategies to improve the performance of HVAC systems for low load homes and home performance retrofits. Presenters and specific topics for this webinar...

  15. Building America Webinar: High Performance Space Conditioning Systems, Part I

    Broader source: Energy.gov [DOE]

    The webinar will focus on strategies to improve the performance of HVAC systems for low load homes and home performance retrofits. Presenters and specific topics for this webinar will be:

  16. Applications of Optimal Building Energy System Selection and Operation

    E-Print Network [OSTI]

    Marnay, Chris

    2014-01-01

    PDP: Peak Day Pricing PV: solar photovoltaic systems SaaS:Software as a Service ST: solar thermal SVOW: StorageEnvironmental Performance of a Solar-Thermal-Assisted HVAC

  17. Applications of Optimal Building Energy System Selection and Operation

    E-Print Network [OSTI]

    Marnay, Chris

    2014-01-01

    solar thermal SVOW: Storage Viability Web Service UCD: University of California, Davis campus, near Sacramento UNM: University of New Mexico,solar-assisted heating ventilation and air conditioning (HVAC) system of a University of New Mexico (

  18. Optimal Control of Harvesting Ice Thermal Storage Systems 

    E-Print Network [OSTI]

    Knebel, D. E.

    1988-01-01

    Thermal storage is becoming a standard consideration in HVAC and process cooling systems. As the technology is refined, more attention is being given to minimize the energy consumption and power demand requirements. This paper addresses a method...

  19. Vehicle Technologies Office: 2011 Vehicle and Systems Simulation...

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

    vehicle evaluation, codes and standards development, and heavy vehicle systems optimization. 2011vsstreport.pdf More Documents & Publications Vehicle Technologies Office:...

  20. Vehicle Technologies Office: 2012 Vehicle and Systems Simulation...

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

    vehicle evaluation, codes and standards development, and heavy vehicle systems optimization. 2012vsstreport.pdf More Documents & Publications Vehicle Technologies Office:...

  1. Vehicle Technologies Office: 2010 Vehicle and Systems Simulation...

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

    vehicle evaluation, codes and standards development, and heavy vehicle systems optimization. 2010vsstreport.pdf More Documents & Publications AVTA PHEV Demonstrations and...

  2. Vehicle Technologies Office: 2013 Vehicle and Systems Simulation...

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

    and field evaluations, codes and standards, industry projects, and vehicle systems optimization. 2013vsstreport.pdf More Documents & Publications Vehicle Technologies Office:...

  3. A High Performance Computing Network and System Simulator for the Power Grid: NGNS^2

    SciTech Connect (OSTI)

    Villa, Oreste; Tumeo, Antonino; Ciraci, Selim; Daily, Jeffrey A.; Fuller, Jason C.

    2012-11-11

    Designing and planing next generation power grid sys- tems composed of large power distribution networks, monitoring and control networks, autonomous generators and consumers of power requires advanced simulation infrastructures. The objective is to predict and analyze in time the behavior of networks of systems for unexpected events such as loss of connectivity, malicious attacks and power loss scenarios. This ultimately allows one to answer questions such as: “What could happen to the power grid if ...”. We want to be able to answer as many questions as possible in the shortest possible time for the largest possible systems. In this paper we present a new High Performance Computing (HPC) oriented simulation infrastructure named Next Generation Network and System Simulator (NGNS2 ). NGNS2 allows for the distribution of a single simulation among multiple computing elements by using MPI and OpenMP threads. NGNS2 provides extensive configuration, fault tolerant and load balancing capabilities needed to simulate large and dynamic systems for long periods of time. We show the preliminary results of the simulator running approximately two million simulated entities both on a 64-node commodity Infiniband cluster and a 48-core SMP workstation.

  4. Aalborg Universitet Analysis and simulation of electromagnetic transients in HVAC cable transmission

    E-Print Network [OSTI]

    Silva, Filipe Faria Da

    in Electrical Engineering. The research was conducted at the Department of Energy Technology for Energinet by Associated Professor Claus Leth Bak (Department of En- ergy Technology) and by Dr. Wojciech Wiechowski plus references and fifteen appendices. A list of all authored and co-authored publications written

  5. Comparisons of HVAC Simulations between EnergyPlus and DOE-2.2 for Data Centers

    E-Print Network [OSTI]

    Hong, Tianzhen

    2009-01-01

    Monthly Cooling Electricity Consumption for San FranciscoOct Nov Dec Cooling Electricity Consumption (kWh) DOE?2.2Monthly Cooling Electricity Consumption for San Francisco 

  6. Comparisons of HVAC Simulations between EnergyPlus and DOE-2.2 for Data Centers

    E-Print Network [OSTI]

    Hong, Tianzhen

    2009-01-01

    Laboratory. LBNL. 1993. DOE-2.1E BDL Summary. Berkeley,Laboratory. LBNL. 1982. DOE-2.1A Engineers Manual. Berkeley,Hirsch and Associates. 2007. DOE-2.2 Documentation Volume

  7. Comparisons of HVAC Simulations between EnergyPlus and DOE-2.2 for Data Centers

    E-Print Network [OSTI]

    Hong, Tianzhen

    2009-01-01

    Company. USDOE. 2007. EnergyPlus 2.1 Input Output Referenceof Energy. USDOE. 2007. EnergyPlus 2.1 Engineering Manual.Hitchcock . 2006. Using EnergyPlus for California Title-24

  8. Modeling and Simulation of HVAC Faulty Operations and Performance Degradation due to Maintenance Issues

    E-Print Network [OSTI]

    Wang, Liping

    2014-01-01

    of building, operations and maintenance play a significantin building operation and maintenance have been neglected.of building, operation and maintenance play a decisive role.

  9. Modeling and Simulation of HVAC Faulty Operations and Performance Degradation due to Maintenance Issues

    E-Print Network [OSTI]

    Wang, Liping

    2014-01-01

    cooling tower fouling, boiler/chiller fouling, refrigerantissues such as chiller or boiler fouling by introducing afactor to the chiller or boiler efficiency inputs to the

  10. Comparisons of HVAC Simulations between EnergyPlus and DOE-2.2 for Data Centers

    E-Print Network [OSTI]

    Hong, Tianzhen

    2009-01-01

    kWh) DOE?2.2 EnergyPlus % Difference Figure 7 – Monthly Cooling Electricity Consumption for Phoenix kWh) DOE?2.2 EnergyPlus % Difference Figure 8 – Monthly Cooling Electricity Consumption for Phoenix 

  11. Monte Carlo Simulations of Lattice Models for Single Polymer Systems

    E-Print Network [OSTI]

    Hsiao-Ping Hsu

    2015-03-03

    Single linear polymer chains in dilute solutions under good solvent conditions are studied by Monte Carlo simulations with the pruned-enriched Rosenbluth method up to the chain length $N \\sim {\\cal O}(10^4)$. Based on the standard simple cubic lattice model (SCLM) with fixed bond length and the bond fluctuation model (BFM) with bond lengths in a range between $2$ and $\\sqrt{10}$, we investigate the conformations of polymer chains described by self-avoiding walks (SAWs) on the simple cubic lattice, and by random walks (RWs) and non-reversible random walks (NRRWs) in the absence of excluded volume (EV) interactions. In addition to flexible chains, we also extend our study to semiflexible chains for different stiffness controlled by a bending potential. The persistence lengths of chains extracted from the orientational correlations are estimated for all cases. We show that chains based on the BFM are more flexible than those based on the SCLM for a fixed bending energy. The microscopic differences between these two lattice models are discussed and the theoretical predictions of scaling laws given in the literature are checked and verified. Our simulations clarify that a different mapping ratio between the coarse-grained models and the atomistically realistic description of polymers is required in a coarse-graining approach due to the different crossovers to the asymptotic behavior.

  12. DOE ZERH Webinar: Low Load High Efficiency HVAC

    Broader source: Energy.gov [DOE]

    Zero Energy Ready Homes have advanced insulation and draft sealing that reduce energy consumption and enable the design and installation of an engineered comfort system that is significantly...

  13. EECBG Success Story: HVAC Upgrade Saving Money, Protecting History...

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

    Saving Money, Protecting History November 2, 2010 - 5:37pm Addthis A new heating and cooling system at Chester County Historical Societys history center is saving the...

  14. Indirect Benefits (Increased Roof Life and HVAC Savings) from...

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

    a decision on the PV installation, the Department of Energy Tiger Team has investigated potential indirect benefits of installing a solar PV system on the Convention Center roof....

  15. A Comparison of Simulation Capabilities for Ducts

    SciTech Connect (OSTI)

    Miller, William A.; Smith, Matt K.; Gu, Lixing; New, Joshua Ryan

    2014-11-01

    Typically, the cheapest way to install a central air conditioning system in residential buildings is to place the ductwork in the attic. Energy losses due to duct-attic interactions can be great, but current whole-house models are unable to capture the dynamic multi-mode physics of the interactions. The building industry is notoriously fragmented and unable to devote adequate research resources to solve this problem. Builders are going to continue to put ducts in the attic because floor space is too expensive to closet them within living space, and there are both construction and aesthetic issues with other approaches such as dropped ceilings. Thus, there is a substantial need to publicly document duct losses and the cost of energy used by ducts in attics so that practitioners, builders, homeowners and state and federal code officials can make informed decisions leading to changes in new construction and additional retrofit actions. Thus, the goal of this study is to conduct a comparison of AtticSim and EnergyPlus simulation algorithms to identify specific features for potential inclusion in EnergyPlus that would allow higher-fidelity modeling of HVAC operation and duct transport of conditioned air. It is anticipated that the resulting analysis from these simulation tools will inform energy decisions relating to the role of ducts in future building energy codes and standards.

  16. Mathematical modeling and computer simulation of processes in energy systems

    SciTech Connect (OSTI)

    Hanjalic, K.C. )

    1990-01-01

    This book is divided into the following chapters. Modeling techniques and tools (fundamental concepts of modeling); 2. Fluid flow, heat and mass transfer, chemical reactions, and combustion; 3. Processes in energy equipment and plant components (boilers, steam and gas turbines, IC engines, heat exchangers, pumps and compressors, nuclear reactors, steam generators and separators, energy transport equipment, energy convertors, etc.); 4. New thermal energy conversion technologies (MHD, coal gasification and liquefaction fluidized-bed combustion, pulse-combustors, multistage combustion, etc.); 5. Combined cycles and plants, cogeneration; 6. Dynamics of energy systems and their components; 7. Integrated approach to energy systems modeling, and 8. Application of modeling in energy expert systems.

  17. NUMERICAL SIMULATION OF RESERVOIR COMPACTION IN LIQUID DOMINATED GEOTHERMAL SYSTEMS

    E-Print Network [OSTI]

    Lippmann, M.J.

    2010-01-01

    13. modeling of liquid geothermal systems: Ph.D. thesis,of water dominated geothermal fields with large temper~of land subsidence in geothermal areas: Proc. 2nd Int. Symp.

  18. NUMERICAL SIMULATION OF RESERVOIR COMPACTION IN LIQUID DOMINATED GEOTHERMAL SYSTEMS

    E-Print Network [OSTI]

    Lippmann, M.J.

    2010-01-01

    XBllSlI-7161 Example 4a. Pore pressure change with time atisothermal system, the pore pressure decreased more in thea' effective stress, P pore pressure, V volume, k intrinsic

  19. Vehicle Technologies Office: 2014 Vehicle and Systems Simulation and Testing Annual Progress Report

    Office of Energy Efficiency and Renewable Energy (EERE)

    This report describes the progress made on the research and development projects funded by the Vehicle and Systems Simulation and Testing subprogram. The Vehicle and Systems Simulation and Testing research and development (R&D) subprogram within the DOE Vehicle Technologies Office (VTO) provides support and guidance for many cutting-edge automotive technologies under development. Research focuses on addressing critical barriers to advancing light-, medium-, and heavy-duty vehicle systems to help maximize the number of electric miles driven and increase the energy efficiency of transportation vehicles.

  20. Design and implementation of a hardware-in-the-loop simulation system for small-scale UAV helicopters q

    E-Print Network [OSTI]

    Benmei, Chen

    Design and implementation of a hardware-in-the-loop simulation system for small-scale UAV: Hardware-in-the-loop simulation UAV Helicopter Flight control a b s t r a c t We present in the paper constructed unmanned-aerial-vehicle (UAV) helicopter systems. Real-time hardware-in-the-loop simulation is one

  1. Advances in Fully-Kinetic PIC Simulations of a Near-Vacuum Hall Thruster and Other Plasma Systems

    E-Print Network [OSTI]

    Advances in Fully-Kinetic PIC Simulations of a Near- Vacuum Hall Thruster and Other Plasma Systems;3 Advances in Fully-Kinetic PIC Simulations of a Near- Vacuum Hall Thruster and Other Plasma Systems generation of simulations used the fully-kinetic particle-in-cell (PIC) model. Although much more

  2. Direct Monte Carlo simulation of chemical reaction systems: Internal energy transfer and an energy-dependent unimolecular reaction

    E-Print Network [OSTI]

    Anderson, James B.

    Direct Monte Carlo simulation of chemical reaction systems: Internal energy transfer and an energy a direct Monte Carlo simulation of an energy-dependent t&molecular reaction system of the type A+ B simulation of a unimo- lecular reaction with an energy-dependent rate constant k3 and with explicit treatment

  3. Towards a Dynamic Data Driven Application System for Wildfire Simulation

    E-Print Network [OSTI]

    Knyazev, Andrew

    -time weather data, images, and sensor streams. The system should change the forecast when new data is received (DDDAS) for short-range forecast of wildfire behavior with models steered by real-time weather data, images, and sensor streams. The forecast should be based on all available data, such as fuel maps

  4. Computer Simulation of Chemical and Biomolecular Systems Vol. 482 (1986)

    E-Print Network [OSTI]

    Mezei, Mihaly

    1986-01-01

    functions to the exploration of the structure and energetics of condensed fluid phases such as liquid water internal energy), various spatial distribution functions for equilibrium systems and time correlation and mecha- nism via activated complex theory also require a particular knowledge of the configurational free

  5. Comparison Between TRNSYS Software Simulation and F-Chart Program on Pool Heating System 

    E-Print Network [OSTI]

    Haberl, J. S.; Baltazar, J. C.; Mao, C.

    2012-01-01

    The purpose of this report is to test the accuracy of TRNSYS simulation of Solar Pool Heating System by comparing with F-Chart program which is an authoritative tool to analyze solar system and was developed in 1970s. This report is organized...

  6. Contribution of simulation in the product-driven systems production activity control

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    control consists in improving existing manufacturing production planning and control systems. We graduallyContribution of simulation in the product-driven systems production activity control Olivier CARDIN the emergence of product driven production activity control concept, the development of RFID technologies had

  7. A modified next reaction method for simulating chemical systems with time dependent propensities and delays

    E-Print Network [OSTI]

    Anderson, David F.

    A modified next reaction method for simulating chemical systems with time dependent propensities; publisher error corrected 28 January 2008 Chemical reaction systems with a low to moderate number with methods that produce statistically exact sample paths such as the Gillespie algorithm or the next reaction

  8. The Momentum Cloud Method for Dynamic Simulation of Rigid Body Systems

    E-Print Network [OSTI]

    Sweetman, Bert

    is presented for a 6-body floating wind turbine system. CE Database subject headings: Simulation, Structural dynamics, Rigid-body dynamics, Wind power, Floating structures 1. Introduction and Background A multibody. Featherstone (Featherstone, 2008) investigates the dynamics formulation of a floating-base rigid-body system

  9. Computer simulation of magnetization-controlled shunt reactors for calculating electromagnetic transients in power systems

    SciTech Connect (OSTI)

    Karpov, A. S. [St Petersburg State Polytechnical University, JSC 'System Operator of the United Power System', Leningradskoe RDU (Russian Federation)] [St Petersburg State Polytechnical University, JSC 'System Operator of the United Power System', Leningradskoe RDU (Russian Federation)

    2013-01-15

    A computer procedure for simulating magnetization-controlled dc shunt reactors is described, which enables the electromagnetic transients in electric power systems to be calculated. It is shown that, by taking technically simple measures in the control system, one can obtain high-speed reactors sufficient for many purposes, and dispense with the use of high-power devices for compensating higher harmonic components.

  10. Heat Pump Water Heater Technology Assessment Based on Laboratory Research and Energy Simulation Models: Preprint

    SciTech Connect (OSTI)

    Hudon, K.; Sparn, B.; Christensen, D.; Maguire, J.

    2012-02-01

    This paper explores the laboratory performance of five integrated Heat Pump Water Heaters (HPWHs) across a wide range of operating conditions representative of US climate regions. Laboratory results demonstrate the efficiency of this technology under most of the conditions tested and show that differences in control schemes and design features impact the performance of the individual units. These results were used to understand current model limitations, and then to bracket the energy savings potential for HPWH technology in various US climate regions. Simulation results show that HPWHs are expected to provide significant energy savings in many climate zones when compared to other types of water heaters (up to 64%, including impact on HVAC systems).

  11. DOE Task 99-4 Extension of Design and Simulation Models 3/24/00 EXTENSION OF EXISTING DESIGN AND SIMULATION MODELS

    E-Print Network [OSTI]

    pump systems, heat transfer, HVAC, hybrid systems, pavement heating, cooling ponds, surface water-source heat pump systems PROJECT BACKGROUND AND STATUS This project originated in 1996 with the aim to reduce the first costs of closed-loop ground-source heat pump (GSHP) systems by reducing the necessary size

  12. SIMES: A Simulator for Hybrid Electrical Energy Storage Systems Siyu Yue, Di Zhu, Yanzhi Wang, and Massoud Pedram

    E-Print Network [OSTI]

    Pedram, Massoud

    SIMES: A Simulator for Hybrid Electrical Energy Storage Systems Siyu Yue, Di Zhu, Yanzhi Wang Electrical Energy Storage System, Simulator 1. Introduction An electrical energy storage (EES) system to store a higher grade of energy compared to other energy storage systems since electrical energy has

  13. Systems simulation of oil additives to grain at terminal elevators 

    E-Print Network [OSTI]

    Goforth, Kerry James

    1985-01-01

    Negligible colorless, odorless stable, inert From: McIlveen, 1984 12 Previous Research Dust suppression characteristics of mineral oil have been evaluated at the United States Grain Marketing Research Laboratory in Manhatten, Kansas. Lai et al. (1981... and are not separated out by normal grain inspection procedures. Foreign matter reductions of up to 1. 5 percent have been reported in informal experiments (Hegadorn, 1984). Country elevators that have no dust collection systems are realizing savings from oil...

  14. Visualization and continuous simulation of a space nuclear power system 

    E-Print Network [OSTI]

    Rawal, Rajiv

    1992-01-01

    - tor Systems. In Third International Symposium on Science and Engineering on Cray Supemornputers (Minneapolis, Minnesota, Sept. 9-11). 1987. 6 Ransom, V. H. et al. RELAP5/MODg Code Manual. EG Ic G Idaho, Inc, Idaho National Engineering Laboratory.... There is need for improvement in the current process. Omega is a graphical user interface driven software, which enables quasi real time anal- ysis of reactor characteristics to be gained without either constructing or operating a full scale space nuclear...

  15. Hybrid Network Simulation for the ATLAS Trigger and Data Acquisition (TDAQ) System

    E-Print Network [OSTI]

    Bonaventura, Matias Alejandro; The ATLAS collaboration; Castro, Rodrigo Daniel; Foguelman, Daniel Jacob

    2015-01-01

    The poster shows the ongoing research in the ATLAS TDAQ group in collaboration with the University of Buenos Aires in the area of hybrid data network simulations. he Data Network and Processing Cluster filters data in real-time, achieving a rejection factor in the order of 40000x and has real-time latency constrains. The dataflow between the processing units (TPUs) and Readout System (ROS) presents a “TCP Incast”-type network pathology which TCP cannot handle it efficiently. A credits system is in place which limits rate of queries and reduces latency. This large computer network, and the complex dataflow has been modelled and simulated using a PowerDEVS, a DEVS-based simulator. The simulation has been validated and used to produce what-if scenarios in the real network. Network Simulation with Hybrid Flows: Speedups and accuracy, combined • For intensive network traffic, Discrete Event simulation models (packet-level granularity) soon becomes prohibitive: Too high computing demands. • Fluid Flow simul...

  16. Estimation of Lateral Distribution Function in Extensive Air Showers by Using AIRES Simulation System

    E-Print Network [OSTI]

    A. Ahmed Al-Rubaiee; Ahmed Jumaah

    2013-05-25

    In this work the estimation of the lateral distribution function in Extensive Air showers was performed by using a system for air shower simulations which is called AIRES version 2.6 for different hadronic models like (QGSJET99, SIBYLL and SIBYLL1.6). The simulation was fulfilled in the high energy range (10^15-10^19 eV) for different primary particles like (gamma, protons and iron nuclei) for vertical showers. This simulation can be used to reconstruct the type and energy of the particle that generated Extensive Air showers for charged particles that registered with different arrays.

  17. Development and use of an interactive computer simulation for generalized technical and economic assessments of cogeneration systems 

    E-Print Network [OSTI]

    Baxter, Geoffrey R.

    1997-01-01

    comprehensive sensitivity analysis were completed to demonstrate the employment of the simulation program. The simulation can model cogeneration systems using either a gas turbine, internal combustion (IC) engine or steam turbine prime mover for both electrical...

  18. Analysis of Aurora’s Performance Simulation Engine for Three Systems

    SciTech Connect (OSTI)

    Freeman, Janine; Simon, Joseph

    2015-07-07

    Aurora Solar Inc. is building a cloud-based optimization platform to automate the design, engineering, and permit generation process of solar photovoltaic (PV) installations. They requested that the National Renewable Energy Laboratory (NREL) validate the performance of the PV system performance simulation engine of Aurora Solar’s solar design platform, Aurora. In previous work, NREL performed a validation of multiple other PV modeling tools [1], so this study builds upon that work by examining all of the same fixed-tilt systems with available module datasheets that NREL selected and used in the aforementioned study. Aurora Solar set up these three operating PV systems in their modeling platform using NREL-provided system specifications and concurrent weather data. NREL then verified the setup of these systems, ran the simulations, and compared the Aurora-predicted performance data to measured performance data for those three systems, as well as to performance data predicted by other PV modeling tools.

  19. Human System Simulation in Support of Human Performance Technical Basis at NPPs

    SciTech Connect (OSTI)

    David Gertman; Katya Le Blanc; alan mecham; william phoenix; Magdy Tawfik; Jeffrey Joe

    2010-06-01

    This paper focuses on strategies and progress toward establishing the Idaho National Laboratory’s (INL’s) Human Systems Simulator Laboratory at the Center for Advanced Energy Studies (CAES), a consortium of Idaho State Universities. The INL is one of the National Laboratories of the US Department of Energy. One of the first planned applications for the Human Systems Simulator Laboratory is implementation of a dynamic nuclear power plant simulation (NPP) where studies of operator workload, situation awareness, performance and preference will be carried out in simulated control rooms including nuclear power plant control rooms. Simulation offers a means by which to review operational concepts, improve design practices and provide a technical basis for licensing decisions. In preparation for the next generation power plant and current government and industry efforts in support of light water reactor sustainability, human operators will be attached to a suite of physiological measurement instruments and, in combination with traditional Human Factors Measurement techniques, carry out control room tasks in simulated advanced digital and hybrid analog/digital control rooms. The current focus of the Human Systems Simulator Laboratory is building core competence in quantitative and qualitative measurements of situation awareness and workload. Of particular interest is whether introduction of digital systems including automated procedures has the potential to reduce workload and enhance safety while improving situation awareness or whether workload is merely shifted and situation awareness is modified in yet to be determined ways. Data analysis is carried out by engineers and scientists and includes measures of the physical and neurological correlates of human performance. The current approach supports a user-centered design philosophy (see ISO 13407 “Human Centered Design Process for Interactive Systems, 1999) wherein the context for task performance along with the requirements of the end-user are taken into account during the design process and the validity of design is determined through testing of real end users

  20. Simulation of condensation systems in the presence of noncondensable gases 

    E-Print Network [OSTI]

    Raja, Laxminarayan Lakshmana

    1992-01-01

    , and turbine trip. The MOD3 version of RELAP5 has been developed jointly by the NRC and a consortium consisting of several of the countries and organizations in the U. S. that are members of the International Code Assessment and Applications Program (ICAP... of the loss of residual heat removal (RHR) system during midloop operations is also per- formed. The RELAP5(MOD3 thermal hydraulic code is utilized for the same. Two separate effects experiments were chosen for this study considering their relevance...