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1

The Organic Rankine Cycle  

Science Journals Connector (OSTI)

Chap. 3 is dedicated to Rankine cycles with organic fluids: the so-called organic Rankine cycles (ORC), which in recent years have ... of the use of...

Costante Mario Invernizzi

2013-01-01T23:59:59.000Z

2

Working fluid design for organic rankine cycle systems (ORC):.  

E-Print Network (OSTI)

??The Organic Rankine Cycle is an energy conversion cycle similar to the conventional Rankine cycle which runs on a working fluid other than water. The… (more)

Hattiangadi, A.

2013-01-01T23:59:59.000Z

3

Working Fluid Design for Organic Rankine Cycle (ORC) Systems:.  

E-Print Network (OSTI)

??The Organic Rankine Cycle is an energy conversion cycle similar to the conventional Rankine cycle which runs on a working fluid other than water. The… (more)

Hattiangadi, A.

2013-01-01T23:59:59.000Z

4

Heat resources and organic Rankine cycle machines  

Science Journals Connector (OSTI)

Abstract Various Rankine cycle architectures for single fluids and other improved versions operating with ammonia/water mixture are presented in this paper. Untapped heat resources and their potential for driving organic Rankine cycles are outlined. The nature – state and temperature of the heat source significantly influences the choice of the type of organic Rankine cycle machine. The temperature appears as a critical parameter during the selection process. Modules differ from one another from technology, size and cost viewpoints. The investment cost of an ORC project includes machine, engineering, system integration, capital costs, etc. and is closely linked to the application.

Bertrand F. Tchanche; M. Pétrissans; G. Papadakis

2014-01-01T23:59:59.000Z

5

Industrial Heat Recovery with Organic Rankine Cycles  

E-Print Network (OSTI)

Rising energy costs are encouraging energy intensive industries to investigate alternative means of waste heat recovery from process streams. The use of organic fluids in Rankine cycles offers improved potential for economical cogeneration from...

Hnat, J. G.; Patten, J. S.; Cutting, J. C.; Bartone, L. M.

1982-01-01T23:59:59.000Z

6

Cascaded organic rankine cycles for waste heat utilization  

DOE Patents (OSTI)

A pair of organic Rankine cycle systems (20, 25) are combined and their respective organic working fluids are chosen such that the organic working fluid of the first organic Rankine cycle is condensed at a condensation temperature that is well above the boiling point of the organic working fluid of the second organic Rankine style system, and a single common heat exchanger (23) is used for both the condenser of the first organic Rankine cycle system and the evaporator of the second organic Rankine cycle system. A preferred organic working fluid of the first system is toluene and that of the second organic working fluid is R245fa.

Radcliff, Thomas D. (Vernon, CT); Biederman, Bruce P. (West Hartford, CT); Brasz, Joost J. (Fayetteville, NY)

2011-05-17T23:59:59.000Z

7

Implementation of an Organic Rankine cycle on a Stepping furnace.  

E-Print Network (OSTI)

?? In this master thesis an implementation of an Organic Rankine Cycle (ORC) on a stepping furnace in a steel mill is modeled and proposed.… (more)

Pižorn, Žiga

2014-01-01T23:59:59.000Z

8

Set point optimization of controlled Organic Rankine Cycle systems  

Science Journals Connector (OSTI)

In this paper, an approach to optimize set points is proposed for controlled Organic Rankine Cycle (ORC) systems. Owing to both disturbances...

Jianhua Zhang; Mingming Lin; Fei Shi; Jia Meng; Jinliang Xu

2014-11-01T23:59:59.000Z

9

Industrial waste heat recovery and cogeneration involving organic Rankine cycles  

Science Journals Connector (OSTI)

This paper proposes a systematic approach for energy integration involving waste heat recovery through an organic Rankine cycle (ORC). The proposed approach is based...

César Giovani Gutiérrez-Arriaga…

2014-08-01T23:59:59.000Z

10

Parabolic Trough Organic Rankine Cycle Power Plant  

SciTech Connect

Arizona Public Service (APS) is required to generate a portion of its electricity from solar resources in order to satisfy its obligation under the Arizona Environmental Portfolio Standard (EPS). In recent years, APS has installed and operates over 4.5 MWe of fixed, tracking, and concentrating photovoltaic systems to help meet the solar portion of this obligation and to develop an understanding of which solar technologies provide the best cost and performance to meet utility needs. During FY04, APS began construction of a 1-MWe parabolic trough concentrating solar power plant. This plant represents the first parabolic trough plant to begin construction since 1991. The plant will also be the first commercial deployment of the Solargenix parabolic trough collector technology developed under contract to the National Renewable Energy Laboratory (NREL). The plant will use an organic Rankine cycle (ORC) power plant, provided by Ormat. The ORC power plant is much simpler than a conventional steam Rankine cycle power plant and allows unattended operation of the facility.

Canada, S.; Cohen, G.; Cable, R.; Brosseau, D.; Price, H.

2005-01-01T23:59:59.000Z

11

Design of organic Rankine cycles for conversion of waste heat in a polygeneration plant .  

E-Print Network (OSTI)

??Organic Rankine cycles provide an alternative to traditional steam Rankine cycles for the conversion of low grade heat sources, where steam cycles are known to… (more)

DiGenova, Kevin (Kevin J.)

2011-01-01T23:59:59.000Z

12

Bubble-Point Measurements of Eight Binary Mixtures for Organic Rankine Cycle Applications  

Science Journals Connector (OSTI)

Bubble-Point Measurements of Eight Binary Mixtures for Organic Rankine Cycle Applications ... These mixtures are of interest as working fluids in organic Rankine power cycles. ...

Stephanie L. Outcalt; Eric W. Lemmon

2013-05-24T23:59:59.000Z

13

Investigation of Organic Rankine Cycle Performance with Variable Mixture Composition  

Science Journals Connector (OSTI)

The present study deals with a comprehensive thermodynamic modeling of a renewable energy-based organic Rankine cycle (ORC). In this regard, two ... investigate the effect of mixture composition on the cycle perf...

H. Barzegaravval; Ibrahim Dincer

2014-01-01T23:59:59.000Z

14

Organic Rankine Cycle for Light Duty Passenger Vehicles  

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

Dynamic model of organic Rankine cycle with R245fa working fluid and conservative component efficiencies predict power generation in excess of electrical accessory load demand under highway drive cycle

15

Selection of Working Fluids for the Organic Rankine Cycle  

E-Print Network (OSTI)

SELECTION OF WORKING FLUIDS FOR THE ORGANIC RANKINE CYCLE H. H. West J. M. Patton Energy Analysts, Inc. Engineering Design Group Houston, Texas Tulsa, Oklahoma K. E. Starling The University of Oklahoma Norman, Oklahoma ABSTRACT...

West, H. H.; Patton, J. M.; Starling, K. E.

1979-01-01T23:59:59.000Z

16

Power Generation From Waste Heat Using Organic Rankine Cycle Systems  

E-Print Network (OSTI)

Many efforts are currently being pursued to develop and implement new energy technologies aimed at meeting our national energy goals The use of organic Rankine cycle engines to generate power from waste heat provides a near term means to greatly...

Prasad, A.

1980-01-01T23:59:59.000Z

17

Organic Rankine Cycles for the Petro-Chemical Industry  

E-Print Network (OSTI)

considered to the limits of economic feasibility. However, both economic and technical feasibility limit the use of waste heat flows with conventional approaches in the 250 F to 350 F range. A packaged organic Rankine power cycle can technically...

Rose, R. K.; Colosimo, D. D.

1979-01-01T23:59:59.000Z

18

Design of organic Rankine cycles for conversion of waste heat in a polygeneration plant  

E-Print Network (OSTI)

Organic Rankine cycles provide an alternative to traditional steam Rankine cycles for the conversion of low grade heat sources, where steam cycles are known to be less efficient and more expensive. This work examines organic ...

DiGenova, Kevin (Kevin J.)

2011-01-01T23:59:59.000Z

19

Current status of an organic Rankine cycle engine development program  

SciTech Connect

The steps taken to achieve improved bearing life in the organic Rankine cycle (ORC) engine being developed for use on solar parabolic dishes are presented. A summary of test results is given. Dynamic tests on the machine shaft and rotors of the ORC engine are also discussed.

Barber, R.E.

1984-03-01T23:59:59.000Z

20

Comparative analysis of CO2-based transcritical Rankine cycle and HFC245fa-based subcritical organic Rankine cycle using low-temperature geothermal source  

Science Journals Connector (OSTI)

A detailed thermodynamic and techno-economic comparison is presented for a CO2-based transcritical Rankine cycle and a subcritical organic Rankine cycle (ORC) using HFC245fa (1,1,1 ... a minimum investment. The e...

Tao Guo; HuaiXin Wang; ShengJun Zhang

2010-06-01T23:59:59.000Z

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


21

Testing and Thermodynamic Analysis of Low-Grade Heat Power Generation System Using Organic Rankine Cycle  

Science Journals Connector (OSTI)

Low grade heat power generation system using Organic Rankine Cycle (ORC) was introduced in this work. ... system behaved better in thermodynamic efficiency than stream-Rankine cycle. Numerical thermodynamic model...

Wei Gu; Yiwu Weng; Guangyi Cao

2007-01-01T23:59:59.000Z

22

Experience with organic Rankine cycles in heat recovery power plants  

SciTech Connect

Over the last 30 years, organic Rankine cycles (ORC) have been increasingly employed to produce power from various heat sources when other alternatives were either technically not feasible or economical. These power plants have logged a total of over 100 million turbine hours of experience demonstrating the maturity and field proven technology of the ORC cycle. The cycle is well adapted to low to moderate temperature heat sources such as waste heat from industrial plants and is widely used to recover energy from geothermal resources. The above cycle technology is well established and applicable to heat recovery of medium size gas turbines and offers significant advantages over conventional steam bottoming cycles.

Bronicki, L.Y.; Elovic, A.; Rettger, P.

1996-11-01T23:59:59.000Z

23

THE TRANSPOSED CRITICAL TEMPERATURE RANKINE THERMODYNAMIC CYCLE  

E-Print Network (OSTI)

Combined Diesel-Organic Rankine Cycle Power Plant", in25OoC) closed simple organic Rankine cycle geothermal powerthe simple closed organic Rankine cycle for a given set of

Pope, William L.

2012-01-01T23:59:59.000Z

24

Predicting toluene degradation in organic Rankine-cycle engines  

SciTech Connect

This paper describes the measurement of toluene degradation in dynamic loop tests that simulate operation of an organic Rankine-cycle engine. Major degradation products and degradation mechanisms are identified, and degradation is quantified. Results indicate that toluene is a stable fluid with benign degradation products, provided that oxygen is excluded from the engine. A means of predicting degradation in the engine is developed. 3 refs., 4 figs., 5 tabs.

Cole, R.L.; Demirgian, J.C.; Allen, J.W.

1987-01-01T23:59:59.000Z

25

Solar thermal organic rankine cycle for micro-generation  

Science Journals Connector (OSTI)

The conceptual design of an Organic Rankine Cycle (ORC) driven by solar thermal energy is developed for the decentralized production of electricity of up to 50 kW. Conventional Rankine Cycle uses water as the working fluid whereas ORC uses organic compound as the working fluid and it is particularly suitable for low temperature applications. The ORC and the solar collector will be sized according to the solar flux distribution in the Republic of Yemen for the required power output of 50 kW. This will be a micro power generation system that consists of two cycles the solar thermal cycle that harness solar energy and the power cycle which is the ORC that generates electricity. As for the solar thermal cycle heat transfer fluid (HTF) circulates the cycle while absorbing thermal energy from the sun through a parabolic trough collector and then storing it in a thermal storage to increase system efficiency and maintains system operation during low radiation. The heat is then transferred to the organic fluid in the ORC via a heat exchanger. The organic fluids to be used and analyzed in the ORC are hydrocarbons R600a and R290.

2012-01-01T23:59:59.000Z

26

Industrial Waste Heat Recovery by Use of Organic Rankine Cycles (ORC)  

Science Journals Connector (OSTI)

The project is a combined analytical and experimental programme to investigate the feasibility of the Organic Rankine Cycle principle for waste heat recovery in industry....

Dipl.-Phys. G. Huppmann

1983-01-01T23:59:59.000Z

27

Optimal Selection of Working Fluid for the Organic Rankine Cycle Driven by Low-Temperature Geothermal Heat  

Science Journals Connector (OSTI)

To select the optimal organic working fluid for organic Rankine cycles driven by low-temperature geothermal heat, the ... thermal performances of low-temperature geothermal heat powered organic Rankine cycles usi...

Wang Hui-tao; Wang Hua; Ge Zhong

2012-01-01T23:59:59.000Z

28

Analysis of Organic Rankine Cycle for Low and Medium Grade Heat Source  

Science Journals Connector (OSTI)

Organic Rankine cycle (ORC) is an effective technique to generate power from low and medium temperature heat source, including industrial waste heat, solar heat, geothermal and biomass etc. Advantages of ORC are high efficiency, simple system, environment ... Keywords: organic Rankine cycle, new energy, waste heat recovery

Zhonghe Han; Yida Yu

2012-07-01T23:59:59.000Z

29

Rankine cycle power plant with improved organic working fluid  

SciTech Connect

In a Rankine cycle power plant having a boiler for vaporizing an organic working fluid which is applied to a turbine in which vaporized working fluid produced by the boiler expands and produces work, a condenser for condensing expanded vaporized working fluid exhausted by the turbine and producing condensate, and means for returning the condensate to the boiler, the improvement is described comprising: (a) operating the boiler so that the organic fluid vaporizes at substantially constant pressure and a temperature not exceeding 400/sup 0/C; (b) applying only vaporized working fluid to the turbine; and (c) using as the working fluid, a compound selected from the group consisting of bicyclic hydrocarbons, substituted bicyclic aromatic hydrocarbons, heterobicyclic aromatic hydrocarbons, substituted heterobicyclic aromatic hydrocarbons, bicyclic compounds where one ring is aromatic and the other condensed ring is nonaromatic, and their mixtures.

Yogev, A.; Mahlab, D.

1988-08-02T23:59:59.000Z

30

Thermodynamic analysis of organic Rankine cycle using dry working fluids  

SciTech Connect

Utilization of waste heat is not economically incentive to the industry once the temperature of the waste heat drops to a certain level. This is primarily due to a low efficiency when converting the energy of the waste heat to some forms of useful power. A Rankine cycle using organic fluids as working fluids, called organic Rankine cycle (ORC), is potentially feasible in recovering low-enthalpy containing heat sources. Nevertheless, an efficient operation of the ORC depends heavily on two factors: working conditions of the cycle and the thermodynamic properties of the working fluids. The main objective of this study is to investigate the effects of these two factors on the performance of the ORC. The working fluids under investigation are: benzene (C{sub 6}H), toluene (C{sub 7}H{sub 8}), p-xylene (C{sub 8}H{sub 10}), R113 and R123. Irreversibility of a system using various working fluids was studied since it represents the energy balance in recovering the waste heat. The study shows that the system efficiency increases as the inlet pressure of the turbine increases regardless of the working fluid used. Among the working fluids under investigation, p-xylene shows the highest efficiency while benzene the lowest. The study also shows that irreversibility depends on the type of heat source. Generally speaking, p-xylene has the lowest irreversibility in recovering a high temperature waste heat while R113 and R123 have a better performance in recovering a low temperature waste heat. In addition, an economic feasibility of ORC using various working fluids is given for ORC`s with commercial capacities.

Wang, S.K.; Hung, T.C. [I-Shou Univ., Tashu (Taiwan, Province of China). Mechanical Engineering Dept.

1998-12-31T23:59:59.000Z

31

Emissions-critical charge cooling using an organic rankine cycle  

DOE Patents (OSTI)

The disclosure provides a system including a Rankine power cycle cooling subsystem providing emissions-critical charge cooling of an input charge flow. The system includes a boiler fluidly coupled to the input charge flow, an energy conversion device fluidly coupled to the boiler, a condenser fluidly coupled to the energy conversion device, a pump fluidly coupled to the condenser and the boiler, an adjuster that adjusts at least one parameter of the Rankine power cycle subsystem to change a temperature of the input charge exiting the boiler, and a sensor adapted to sense a temperature characteristic of the vaporized input charge. The system includes a controller that can determine a target temperature of the input charge sufficient to meet or exceed predetermined target emissions and cause the adjuster to adjust at least one parameter of the Rankine power cycle to achieve the predetermined target emissions.

Ernst, Timothy C.; Nelson, Christopher R.

2014-07-15T23:59:59.000Z

32

Improving the Control Performance of an Organic Rankine Cycle System for Waste Heat Recovery from a Heavy-Duty  

E-Print Network (OSTI)

Improving the Control Performance of an Organic Rankine Cycle System for Waste Heat Recovery from and efficiency of those systems. The system considered here is an Organic Rankine Cycle (ORC) for recovering internal combustion engines presented in [1]. The system considered here is an Organic Rankine Cycle (ORC

Paris-Sud XI, Université de

33

Rapid Screening of Fluids for Chemical Stability in Organic Rankine Cycle Applications  

Science Journals Connector (OSTI)

Description of the SMR cycle, which combines fluid elements of steam and organic Rankine cycles ... isomerization of 1-pentyl radical to 2-pentyl radical, which proceeds via a five-membered, cyclic transition state. ...

Wendy C. Andersen; Thomas J. Bruno

2005-06-02T23:59:59.000Z

34

Cost Effective Waste Heat Organic Rankine Cycle Applications and Systems Designs  

E-Print Network (OSTI)

Conceptually, the Organic Rankine Cycle (ORC) power cycle has been well known to the engineering community for many years. Despite the rapid escalation of energy costs during the past decade, and a concerted, though somewhat belated, effort towards...

Rohrer, J. W.; Bronicki, L. Y.

1980-01-01T23:59:59.000Z

35

Slag-washing water of blast furnace power station with supercritical organic Rankine cycle  

Science Journals Connector (OSTI)

Organic Rankine cycle (ORC) power plant operating with supercritical ... of a supercritical power plant. Two typical organic fluids with sufficiently low critical parameters were ... study the efficiency of the s...

Song Xiao ??; Shu-ying Wu ???; Dong-sheng Zheng ???

2013-03-01T23:59:59.000Z

36

Trends in Patent Applications Relating to Organic Rankine Cycle  

Science Journals Connector (OSTI)

Abstract This study presents a statistical analysis of patent data to explore the technological developments of the Organic Rankine Cycle (ORC). The ORC is considered as one of the most economic and efficient ways to convert low grade thermal energy to electricity. Patent data of this study are obtained from the commercial database, Thomson Innovation, which can be used to search the patent information from many countries and offices. With searching, screening, and patent family integrating by the International Patent Documentation Center (INPADOC), 304 patents are analyzed in the present study. The results show that the patent applications increase slowly before 2006, but increase significantly from 2009 to 2011 mainly due to the contributions from the applications in China and Republic of Korea. The year of 2009 can be regarded as a significant distinction year for the ORC development and patent application. The results also show that the assignee from United States is the most prominent. On the other hand, the number of patent applications in China is the largest, indicating that China might be one of the most potential markets of the ORC. The main International Patent Classification (IPC) of the patent data is F01K (i.e., Steam engine plants; Steam accumulators; Engine plants not otherwise provided for; Engines using special working fluids or cycles). Most importantly, the technology life cycle of the ORC, based on the patent data, is at a growth stage.

Ben-Ran Fu; Sung-Wei Hsu; Chih-His Liu

2014-01-01T23:59:59.000Z

37

Rankine and Brayton Cycle Cogeneration for Glass Melting  

E-Print Network (OSTI)

Rankine cycle, b) an organic Rankine cycle, c) an indirectly heated positive pressure Brayton cycle and d) a directly heated subatmospheric Brayton cycle. For the specified flue gas temperatures considered, the organic Rankine cycle produced the most...

Hnat, J. G.; Patten, J. S.; Sheth, P. R.

1981-01-01T23:59:59.000Z

38

Operation and performance of a low temperature Organic Rankine Cycle  

Science Journals Connector (OSTI)

Abstract The test and analysis of an Organic Rankine Cycle (ORC) with R123 as the working fluid were presented in this paper. A scroll expander was integrated in the system to generate work. The expander was connected with an AC dynamometer unit, which was used to control and measure the expander shaft torque and rotating speed. The conductive oil simulated the low grade heat source. Operation characteristics were compared between the heat source temperatures of 140°C and 160°C. The experiments were conducted by adjusting two independent parameters: the pumping frequency of the R123 pump and the shaft torque of the expander. The former parameter was directly related to the R123 mass flow rate and the later to the external load. The optimum system performance can be determined by these two parameters. The maximum measured shaft power and thermal efficiency were 2.35 kW and 6.39% at the heat source temperature of 140°C, but they were 3.25 kW and 5.12% at the heat source temperature of 160°C. This study identified that the measured shaft power was about 15-20% lower than the enthalpy determined values, and the pumping power of the organic fluid was 2-4 times higher than the enthalpy determined values. The enthalpy determined values were based on the local pressure and temperature sensor measurements.

Zheng Miao; Jinliang Xu; Xufei Yang; Jinhuang Zou

2014-01-01T23:59:59.000Z

39

Multiple Rankine topping cycles  

SciTech Connect

The efficiency of a Rankine cycle is primarily determined by the temperatures of heat addition and rejection. However, no working fluid has been identified which will operate in a Rankine cycle over an extremely wide temperature range. Multiple Rankine topping cycles offer a technique for achieving high thermal efficiencies in power plants by allowing the use of several working fluids. This paper gives a history of Rankine topping cycles, presents an analysis for the calculation of the overall efficiency of a three-module multiple Rankine cycle, and presents results from a case study for a sodium-mercury-water cycle.

McWhirter, J.D. [Argonne National Lab., Idaho Falls, ID (United States). Engineering Div.]|[Idaho State Univ., Pocatello, ID (United States). Coll. of Engineering

1995-07-01T23:59:59.000Z

40

Working fluid selection based on critical temperature and water temperature in organic Rankine cycle  

Science Journals Connector (OSTI)

This paper examines the thermal performance of working fluids in the entire evaporation temperature region up to near-critical temperature of working fluids in the organic Rankine cycle (ORC). The variation and t...

XinGuo Li; WenJing Zhao; DieDie Lin; Qiang Zhu

2014-11-01T23:59:59.000Z

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


41

Low-grade geothermal energy conversion by organic Rankine cycle turbine generator  

SciTech Connect

This paper reports results of a demonstration project which helped determine the feasibility of converting low-grade thermal energy in 49/sup 0/C water into electrical energy via an organic Rankine cycle 2500 watt (electrical) turbine-generator. The geothermal source which supplied the water is located in a rural Alaskan village. The primary reasons an organic Rankine cycle turbine-generator was investigated as a possible source of electric power in rural Alaska are: high cost of operating diesel-electric units and their poor long-term reliability when high-quality maintenance is unavailable; and the extremely high level of long-term reliability reportedly attained by commercially available organic Rankine cycle turbines. The important contribution made by this project is data provided on the thermal and electrical operating characteristics of an experimental organic Rankine cycle turbine-generator operating at a uniquely low vaporizer temperature.

Zarling, J.P.; Aspnes, J.D.

1983-08-01T23:59:59.000Z

42

Molecular Entropy, Thermal Efficiency, and Designing of Working Fluids for Organic Rankine Cycles  

Science Journals Connector (OSTI)

A shortage of fossil energy sources boosts the utilization of renewable energy. Among numerous novel techniques, recovering energy from low-grade heat sources through power generation via organic Rankine cycles (...

Jingtao Wang; Jin Zhang; Zhiyou Chen

2012-06-01T23:59:59.000Z

43

A thermodynamic study of waste heat recovery from GT-MHR using organic Rankine cycles  

Science Journals Connector (OSTI)

This paper presents an investigation on the utilization of waste heat from a gas turbine-modular helium reactor (GT-MHR) using different arrangements of organic Rankine cycles (ORCs) for power production. The con...

Mortaza Yari; S. M. S. Mahmoudi

2011-02-01T23:59:59.000Z

44

Quasi-dynamic model for an organic Rankine cycle  

Science Journals Connector (OSTI)

Abstract When considering solar based thermal energy input to an organic Rankine cycle (ORC), intermittent nature of the heat input does not only adversely affect the power output but also it may prevent ORC to operate under steady state conditions. In order to identify reliability and efficiency of such systems, this paper presents a simplified transient modeling approach for an ORC operating under variable heat input. The approach considers that response of the system to heat input variations is mainly dictated by the evaporator. Consequently, overall system is assembled using dynamic models for the heat exchangers (evaporator and condenser) and static models of the pump and the expander. In addition, pressure drop within heat exchangers is neglected. The model is compared to benchmark numerical and experimental data showing that the underlying assumptions are reasonable for cases where thermal input varies in time. Furthermore, the model is studied on another configuration and mass flow rates of both the working fluid and hot water and hot water’s inlet temperature to the ORC unit are shown to have direct influence on the system’s response.

Musbaudeen O. Bamgbopa; Eray Uzgoren

2013-01-01T23:59:59.000Z

45

Thermodynamic analysis of organic Rankine cycle using zeotropic mixtures  

Science Journals Connector (OSTI)

Abstract In recent years, more and more attention has been paid to organic Rankine cycle (ORC), which is simply structured, highly reliable and easily maintainable. In order to improve the efficiency of ORC systems, zeotropic mixtures whose phase change process is variable temperature, are used as working fluids to match the temperature profiles of the heat source and heat sink. In this paper, a thermodynamic model which mainly includes Jacob number and the ratio of evaporation temperature and condensation temperature is proposed to forecast the thermal efficiency, output work and exergy efficiency of ORC system with zeotropic mixture. Furthermore, the proposed model programmed by Mablab 2010a is verified by the theoretical data. Then, for different heat source inlet temperature, using different zeotropic mixture pairs, output work that is objective function is maximized by optimizing the evaporation temperature. The results show that if the other working conditions are fixed, the heat source inlet temperature has a significant influence on the best composition of zeotropic mixtures at the optimal evaporation temperature. With the increase of heat source inlet temperature, there exists a heat source inlet temperature that pure working fluid has better system performance than zeotropic mixture. The extent of ORC system performance improvement has a positive correlation with zeotropic mixture’s temperature glide.

Li Zhao; Junjiang Bao

2014-01-01T23:59:59.000Z

46

Optimized nuclear and solar dynamic organic Rankine cycles for Space Station applications  

E-Print Network (OSTI)

OPTIMIZED NUCLEAR AND SOLAR DYNAMIC ORGANIC RANKINE CYCLES FOR SPACE STATION A. PPLICATIONS A Thesis by DANA LEN EUBANKS Submitted to the Office of Graduate Studies of Texas AkM University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE December 1988 Major Subject: Nuclear Engineering OPTIMIZED NUCLEAR AND SOLAR DYNAMIC ORGANIC RANKINE CYCLES FOR SPACE STATION APPLICATIONS A Thesis by DANA LEN EUBANKS Approved as to style and content by: Frederick R...

Eubanks, Dana Len

2012-06-07T23:59:59.000Z

47

Offshore Rankine Cycles.  

E-Print Network (OSTI)

?? The title of the thesis - "Offshore Rankine Cycles" - is very general and cover a large range of engineering fields, e.g. thermodynamic cycles… (more)

Brandsar, Jo

2012-01-01T23:59:59.000Z

48

Thermodynamische Auslegung und transiente Simulation eines überkritischen Organic Rankine Cycles für einen leistungsoptimierten Betrieb (KIT Scientific Reports ; 7674).  

E-Print Network (OSTI)

??Niedertemperaturwärme im Bereich von 100 °C - 200 °C kann mittels Organic Rankine Cycles (ORC) zur Stromproduktion genutzt werden. Zur Untersuchung von Optimierungsmöglichkeiten bei ORC-Prozessen… (more)

Vetter, Christian

2014-01-01T23:59:59.000Z

49

Structure and Parameters Optimization of Organic Rankine Cycle System for Natural Gas Compressor Exhaust Gas Energy Recovery  

Science Journals Connector (OSTI)

In the paper, the structure and working principle of free piston based organic rankine cycle (ORC) exhaust gas energy recovery system...

Yongqiang Han; Zhongchang Liu; Yun Xu…

2013-01-01T23:59:59.000Z

50

Diesel organic Rankine bottoming-cycle powerplant program: Volume III. Appendices. Final report. [Using Fluorinol-85 as working fluid  

SciTech Connect

The final report on organic Rankine cycle power systems used to recover energy either from the waste heat of power-generating diesel engines or from waste heat from industrial plants has the following appendices which are included in this volume: major component specifications; test plan for the power conversion subsystem of the Diesel-Organic Rankine-Cycle Power Plant; environmental assessment of Fluorinol-85 which is the working fluid in the Rankine Cycle System; and applicable regulations and codes. (LCL)

Not Available

1981-10-01T23:59:59.000Z

51

Methodology of Regenerator Calculation for Use in Subcritical and Transcritical Organic Rankine Cycle for Low-Temperature Heat Recovery  

Science Journals Connector (OSTI)

A comparative study of different Cases (A1, A2, B, C1, C2, D) of regenerator calculating methodology has been carried out for use in subcritical and transcritical organic Rankine cycles(ORCs) driven by low-temperature heat sources. The applicable ranges ... Keywords: organic Rankine cycle (ORC), subcritical, transcritical, regenerator, low-temperature heat source

Tao Guo; Huaixin Wang; Shengjun Zhang; Shihai Yin

2010-06-01T23:59:59.000Z

52

Waste Heat Recovery by Organic Fluid Rankine Cycle  

E-Print Network (OSTI)

In organic vapor cycles, the compression work is often comparatively more important than in steam cycles. The efficiency of the pump should not be neglected. T, , Tr2 " Tr " 3 "" " 12 '--_L----L__-i tc Qv,>Qv2~Qv3 flowrole 'lturb ' 0.85 12~ 3JO... In organic vapor cycles, the compression work is often comparatively more important than in steam cycles. The efficiency of the pump should not be neglected. T, , Tr2 " Tr " 3 "" " 12 '--_L----L__-i tc Qv,>Qv2~Qv3 flowrole 'lturb ' 0.85 12~ 3JO...

Verneau, A.

1979-01-01T23:59:59.000Z

53

Thermal Stability of Cyclopentane as an Organic Rankine Cycle Working Fluid  

Science Journals Connector (OSTI)

Thermal Stability of Cyclopentane as an Organic Rankine Cycle Working Fluid ... Because of the rather low molecular weight of water, the use of steam Rankine cycles for waste heat temperatures below 400 °C is inefficient and requires the use of expensive multistage expanders. ... Cyclopentane (C5H10) is a cyclic alkane that exhibits a “puckered” (i.e., one carbon atom tends to jut out above the others to relieve ring stress) ring system of carbon–hydrogen (C–H) bonds and carbon–carbon (C–C) single bonds. ...

Daniel M. Ginosar; Lucia M. Petkovic; Donna Post Guillen

2011-08-02T23:59:59.000Z

54

Altheim geothermal Plant for electricity production by Organic Rankine Cycle turbogenerator  

SciTech Connect

The paper describes the plan of the town Altheim in Upper Austria to produce electricity by an Organic Rankine Cycle-turbogenerator in the field of utilization of low temperatured thermal water. The aim of the project is to improve the technical and economic situation of the geothermal plant.

Pernecker, Gerhard; Ruhland, Johannes

1996-01-24T23:59:59.000Z

55

Analysis and reduction of degradation of working fluid in the Sundstrand Organic Rankine-Cycle System  

SciTech Connect

Studies on understanding the location and construction levels of oxygen in the organic Rankine cycle (ORC) unit and establishing a rate of degradation with time for toluene in an operating ORC system are presented. Work on identifying the compounds in degraded toluene and contamination removal is discussed. (MHR)

Berger, R.

1983-07-01T23:59:59.000Z

56

Final Report. Conversion of Low Temperature Waste Heat Utilizing Hermetic Organic Rankine Cycle  

SciTech Connect

The design of waste heat recovery using the organic Rankine cycle (ORC) engine is updated. Advances in power electronics with lower cost enable the use of a single shaft, high-speed generator eliminating wear items and allowing hermetic sealing of the working fluid. This allows maintenance free operation and a compact configuration that lowers cost, enabling new market opportunities.

Fuller, Robert L.

2005-04-20T23:59:59.000Z

57

Heat-Exchanger Network Synthesis Involving Organic Rankine Cycle for Waste Heat Recovery  

Science Journals Connector (OSTI)

This article aims to present a mathematical model for the synthesis of a heat-exchanger network (HEN) which can be integrated with an organic Rankine cycle (ORC) for the recovery of low-grade waste heat from the heat surplus zone of the background ...

Cheng-Liang Chen; Feng-Yi Chang; Tzu-Hsiang Chao; Hui-Chu Chen; Jui-Yuan Lee

2014-04-23T23:59:59.000Z

58

Altheim geothermal plant for electricity production by organic Rankine cycle turbogenerator  

SciTech Connect

The paper describes the plan of the town Altheim in Upper Austria to produce electricity by an Organic Rankine Cycle-turbogenerator in the field of utilization of low temperatured thermal water. The aim of the project is to improve the technical and economic situation of the geothermal plant.

Pernecker, G. [Municipality of Altheim (Austria); Ruhland, J. [TERRAWAT GmbH, Schwaben (Germany)

1996-12-31T23:59:59.000Z

59

Electric power generation from a geothermal source utilizing a low-temperature organic Rankine cycle turbine  

SciTech Connect

A demonstration project to generate electricity with a geothermal source and low-temperature organic Rankine cycle turbine in a rural Alaskan location is described. Operating data and a set of conclusions are presented detailing problems and recommendations for others contemplating this approach to electric power generation.

Aspnes, J.D.; Zarling, J.P.

1982-12-01T23:59:59.000Z

60

The Organic Rankine Cycle System, Its Application to Extract Energy From Low Temperature Waste Heat  

E-Print Network (OSTI)

The conservation of energy by its recovery from low temperature waste heat is of increasing importance in today's world energy crisis. The Organic Rankine Cycle is a cost efficient and proven method of converting low temperature (200-400o F) waste...

Sawyer, R. H.; Ichikawa, S.

1980-01-01T23:59:59.000Z

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


61

Analysis of design and part load performance of micro gas turbine/organic Rankine cycle combined systems  

Science Journals Connector (OSTI)

This study analyzes the design and part load performance of a power generation system combining a micro gas turbine (MGT) and an organic Rankine cycle (ORC). Design performances of cycles adopting several differe...

Joon Hee Lee; Tong Seop Kim

2006-09-01T23:59:59.000Z

62

A concept of power generator using wind turbine, hydrodynamic retarder, and organic Rankine cycle drive  

Science Journals Connector (OSTI)

This paper describes a concept of electric power generating system that uses a wind turbine to generate kinetic energy which converts heat through a hydrodynamic retarder. The heat so generated is utilized to drive an organic Rankine cycle that converts thermal energy into electricity power for continuous and undisrupted supply during the year. A hydrodynamic retarder converts kinetic energy into heat through hot fluid by directing the flow of the fluid into the hydrodynamic retarder in a manner that resists rotation of blades of the wind turbine. The hot fluid circulating in the hydrodynamic retarder is a thermal heat source for vapor regeneration of organic heat exchange fluid mixture(s) used in the Rankine cycle. The expansion of the organic heat exchange fluid gets converted into rotation of the generator rotor.

Samuel Sami

2013-01-01T23:59:59.000Z

63

Waste Heat-to-Power in Small Scale Industry Using Scroll Expander for Organic Rankine Bottoming Cycle  

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

The project objective is to develop the scroll expander for Organic Rankine cycle (ORC) systems to be used in medium-grade waste heat recovery applications, and to validate and quantify the benefits of the prototype system.

64

Measurement of Thermophysical Pure Component Properties for a Few Siloxanes Used as Working Fluids for Organic Rankine Cycles  

Science Journals Connector (OSTI)

Measurement of Thermophysical Pure Component Properties for a Few Siloxanes Used as Working Fluids for Organic Rankine Cycles ... K and for two cyclic siloxanes (octamethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5)) in the temperature range of 288.15–443.15 ... Organic Rankine cycle (ORC) processes are gaining increasing interest(1-5) for the utilization of renewable energy such as geothermal heat, solar energy, biomass, and waste heat for the generation of electricity. ...

Rima Abbas; Andre Schedemann; Christian Ihmels; Sabine Enders; Ju?rgen Gmehling

2011-06-30T23:59:59.000Z

65

Rankine cycle leak detection via continuous monitoring  

SciTech Connect

Rankine cycle power plants operate on a closed cycle in which heat is transferred from a high temperature reservoir to a low temperature sink while performing useful work. leaks in this cycle cause the loss of working fluid and/or corrosion of the power plant. Both of these constitute a loss of capital assets. A severe leak can reduce the efficiency of the cycle to the extent of creating an operating loss. PNL is undertaking the development of continuous monitoring techniques to protect rankine cycle plants from such losses. The location of these continuous monitors on an organic rankine cycle is described and shown schematically.

Kindle, Cecil H.

1982-10-08T23:59:59.000Z

66

Dynamic modeling and optimal control strategy of waste heat recovery Organic Rankine Cycles  

Science Journals Connector (OSTI)

Organic Rankine Cycles (ORCs) are particularly suitable for recovering energy from low-grade heat sources. This paper describes the behavior of a small-scale ORC used to recover energy from a variable flow rate and temperature waste heat source. A traditional static model is unable to predict transient behavior in a cycle with a varying thermal source, whereas this capability is essential for simulating an appropriate cycle control strategy during part-load operation and start and stop procedures. A dynamic model of the ORC is therefore proposed focusing specifically on the time-varying performance of the heat exchangers, the dynamics of the other components being of minor importance. Three different control strategies are proposed and compared. The simulation results show that a model predictive control strategy based on the steady-state optimization of the cycle under various conditions is the one showing the best results.

Sylvain Quoilin; Richard Aumann; Andreas Grill; Andreas Schuster; Vincent Lemort; Hartmut Spliethoff

2011-01-01T23:59:59.000Z

67

Measurement of Transport Properties for Selected Siloxanes and Their Mixtures Used as Working Fluids for Organic Rankine Cycles  

Science Journals Connector (OSTI)

Measurement of Transport Properties for Selected Siloxanes and Their Mixtures Used as Working Fluids for Organic Rankine Cycles ... Thermal conductivities have been measured for three linear siloxanes [hexamethyl disiloxane (MM), octamethyltrisiloxane (MDM), decamethyltetrasiloxane (MD2M)], two cyclic siloxanes [octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5)], and a mixture of 50 mass % MDM + 50 mass % MD2M in the temperature range from 290 to 520 K and the pressure range from 500 to 10000 kPa using the transient hot wire method and correlated with a temperature–pressure–thermal conductivity relationship. ... To generate electricity from renewable energy, organic Rankine cycle (ORC) processes can be used. ...

Rima Abbas; E. Christian Ihmels; Sabine Enders; Ju?rgen Gmehling

2011-05-26T23:59:59.000Z

68

Application guide for waste heat recovery with organic Rankine cycle equipment. Final report May-Dec 82  

SciTech Connect

This report assesses the state-of-the-art of commercially available organic Rankine cycle (ORC) hardware from a literature search and industry survey. Engineering criteria for applying ORC technology are established, and a set of nomograms to enable the rapid sizing of the equipment is presented. A comparison of an ORC system with conventional heat recovery techniques can be made with a nomogram developed for a recuperative heat exchanger. A graphical technique for evaluating the economic aspects of an ORC system and conventional heat recovery method is discussed; also included is a description of anticipated future trends in organic Rankine cycle RandD.

Moynihan, P.I.

1983-01-15T23:59:59.000Z

69

Working fluid for Rankine cycle  

SciTech Connect

A Rankine cycle working fluid is disclosed containing a mixture of 2,2,3,3tetrafluoropropanol and water, which is low toxic, incombustible, nonexplosive, noncorrosive and stable, and also has a high critical temperature and forms azeotropic-like composition. It is suited for use in a rankine cycle using heat source of low temperature.

Aomi, H.; Enjo, N.

1980-11-11T23:59:59.000Z

70

Analysis of zeotropic mixtures used in high-temperature Organic Rankine cycle  

Science Journals Connector (OSTI)

Abstract The paper investigates the performance of high-temperature Organic Rankine cycle (ORC) with zeotropic mixtures as working fluid. A numerical model, which has been validated by comparing with the published data, is developed to predict the first law thermal efficiency of the cycle. The effects of mixture concentration, temperature gradient of the heat transfer fluid, pinch temperature difference, pressure ratio, and condensation pressure on the first law efficiency are presented firstly using a purposely designed program, and then the suitable conditions for the described ORC are suggested based on the results of the simulation. It is demonstrated that the use of zeotropic mixtures leads to an efficiency increase compared to pure fluids.

Bensi Dong; Guoqiang Xu; Yi Cai; Haiwang Li

2014-01-01T23:59:59.000Z

71

Minimum variance control of organic Rankine cycle based waste heat recovery  

Science Journals Connector (OSTI)

Abstract In this paper, an online self-tuning generalized minimum variance (GMV) controller is proposed for a 100 KW waste heat recovery system with organic Rankine cycle (ORC). The ORC process model is formulated by the controlled autoregressive moving average (CARMA) model whose parameters are identified using the recursive least squares (RLS) algorithm with forgetting factor. The generalized minimum variance algorithm is applied to regulate ORC based waste heat recovery system. The contributions of this work are twofold: (1) the proposed control strategy is formulated under the data-driven framework, which does not need the precise mathematic model; (2) this proposed method is applied to handle tracking set-point variations and process disturbances by improved minimum objective GMV function. The performance of GMV controller is compared with the PID controller. The simulation results show that the proposed strategy can achieve satisfactory set-point tracking and disturbance rejection performance.

Guolian Hou; Shanshan Bi; Mingming Lin; Jianhua Zhang; Jinliang Xu

2014-01-01T23:59:59.000Z

72

Optimization of power generation from a set of low-temperature abandoned gas wells, using organic Rankine cycle  

Science Journals Connector (OSTI)

This research article deals with the employment of organic Rankine cycle (ORC) to generate electricity from a set of low-temperature abandoned gas wells in Iran. At first a thermodynamic analysis was performed to select an appropriate power cycle; consequently organic Rankine cycle was chosen. Then a comprehensive investigation was carried out to find a typical low-temperature abandoned gas reservoir so an abandoned gas reservoir in the central part of Iran was considered. The next step was selecting the working fluid; in this regard a vast range of common organic fluids were studied and R125 was chosen. Finally the gas well and the power plant were simulated and then a parametric optimization of the ORC plant was performed in order to achieve optimum power generation and also to compute generated power at different operational parameters of gas wells and power cycle.

Mahyar Ebrahimi; Seyed Ebrahim Moussavi Torshizi

2012-01-01T23:59:59.000Z

73

Economic comparison of ORC (Organic Rankine cycle) processes at different scales  

Science Journals Connector (OSTI)

Abstract The utilization of low temperature heat sources, e.g. waste heat, for power generation in Organic Rankine Cycles has become more and more important in recent decades. In this work, exhaust gas as the heat transfer medium is considered. Five organic working fluids in three cycle designs at three different scales are investigated in Aspen Plus V7.3. Additionally, two different constraints have been applied to the exhaust gas temperature: A minimum of 180 °C in order to avoid the acid dew point and a minimal temperature approach, where the pinch point in the exhaust gas heat exchanger is fixed at 10 K. The investigated turbine-bleeding process with regenerative pre-heating benefits higher exhaust gas outlet temperatures for further combined heat and power applications in conjunction with enhanced system performances. Also noteworthy is the lower total heat exchanger area of the process compared to the reference designs. Economic analyses are carried out in order to outline the economic merits of the turbine-bleeding cycle.

Dominik Meinel; Christoph Wieland; Hartmut Spliethoff

2014-01-01T23:59:59.000Z

74

Performance evaluation of an Organic Rankine Cycle (ORC) for power applications from low grade heat sources  

Science Journals Connector (OSTI)

Abstract In this paper the performance of an Organic Rankine Cycle (ORC) module, which was designed and built for a specific power application, is experimentally characterized. The ORC tested satisfies the main specifications for an efficient power system, highlighting a volumetric expander with large built-in volume ratio. For tests development, a monitored test bench has been used and adapted to the planned test procedure, which consisted of varying the thermal power input for different condensing conditions. Thereby, 10 steady state points are achieved and analyzed according to thermal power input, gross and net electrical powers, electrical cycle efficiencies and expander effectiveness. The results show that the ORC performances are improved for higher thermal oil temperatures, capturing more thermal power, producing more electricity and achieving better cycle efficiencies. The maximum gross electrical efficiency obtained is 12.32%, for a heat source temperature about 155 °C and a direct dissipation to the ambient. Moreover, the expander reaches an electrical isentropic effectiveness about 65% for an optimum pressure ratio around 7, being a suitable system for power applications from low grade heat sources.

Bernardo Peris; Joaquín Navarro-Esbrí; Francisco Molés; Roberto Collado; Adrián Mota-Babiloni

2014-01-01T23:59:59.000Z

75

Power production from a moderate temperature geothermal resource with regenerative Organic Rankine Cycles  

Science Journals Connector (OSTI)

Much remains to be done in binary geothermal power plant technology, especially for exploiting low-enthalpy resources. Due to the great variability of available resources (temperature, pressure, chemical composition), it is really difficult to “standardize the technology”.The problem involves many different variables: working fluid selection, heat recovery system definition, heat transfer surfaces sizing and auxiliary systems consumption. Electricity generation from geothermal resources is convenient if temperature of geothermal resources is higher than 130 °C. Extension of binary power technology to use low-temperature geothermal resources has received much attention in the last years. This paper analyzes and discusses the exploitation of low temperature, water-dominated geothermal fields with a specific attention to regenerative Organic Rankine Cycles (ORC). The geothermal fluid inlet temperatures considered are in the 100–130 °C range, while the return temperature of the brine is assumed to be between 70 and 100 °C. The performances of different configurations, two basic cycle configurations and two recuperated cycles are analyzed and compared using dry organic fluids as the working fluids. The dry organic fluids for this study are R134a, isobutane, n-pentane and R245fa. Effects of the operating parameters such as turbine inlet temperature and pressure on the thermal efficiency, exergy destruction rate and Second Law efficiency are evaluated. The possible advantages of recuperated configurations in comparison with basic configurations are analyzed, showing that in a lot of cases the advantage in terms of performance increase is minimal but significant reductions in cooling systems surface area can be obtained (up to 20%).

Alessandro Franco

2011-01-01T23:59:59.000Z

76

Modeling Energy Recovery Using Thermoelectric Conversion Integrated with an Organic Rankine Bottoming Cycle  

SciTech Connect

Hot engine exhaust represents a resource that is often rejected to the environment without further utilization. This resource is most prevalent in the transportation sector, but stationary engine-generator systems also typically do not utilize this resource. Engine exhaust is a source of high grade thermal energy that can potentially be utilized by various approaches to produce electricity or to drive heating and cooling systems. This paper describes a model system that employs thermoelectric conversion as a topping cycle integrated with an organic Rankine bottoming cycle for waste heat utilization. This approach is being developed to fully utilize the thermal energy contained in hot exhaust streams. The model is composed of a high temperature heat exchanger which extracts thermal energy for driving the thermoelectric conversion elements. However, substantial sensible heat remains in the exhaust stream after emerging from the heat exchanger. The model incorporates a closely integrated bottoming cycle to utilize this remaining thermal energy in the exhaust stream. The model has many interacting parameters that define combined system quantities such as overall output power, efficiency, and total energy utilization factors. In addition, the model identifies a maximum power operating point for the system. That is, the model can identify the optimal amount of heat to remove from the exhaust flow to run through the thermoelectric elements. Removing too much or too little heat from the exhaust stream in this stage will reduce overall cycle performance. The model has been developed such that heat exchanger UAh values, thermal resistances, ZT values, and multiple thermoelectric elements can be investigated in the context of system operation. The model also has the ability to simultaneously determine the effect of each cycle design parameter on the performance of the overall system, thus giving the ability to utilize as much waste heat as possible. Key analysis results are presented showing the impact of critical design parameters on power output, system performance and inter-relationships between design parameters in governing performance.

Miller, Erik W.; Hendricks, Terry J.; Peterson, Richard B.

2009-07-01T23:59:59.000Z

77

Applicability of entropy, entransy and exergy analyses to the optimization of the Organic Rankine Cycle  

Science Journals Connector (OSTI)

Abstract Based on the theories of entropy, entransy and exergy, the concepts of entropy generation rate, revised entropy generation number, exergy destruction rate, entransy loss rate, entransy dissipation rate and entransy efficiency are applied to the optimization of the Organic Rankine Cycle. Cycles operating on R123 and N-pentane have been compared in three common cases which are variable evaporation temperature, hot stream temperature and hot stream mass flow rate. The optimization goal is to produce maximum output power. Some numerical analyses and simulations are presented, and the results show that when both the hot and cold stream conditions are fixed, all the entropy principle, the exergy theory, the entransy loss rate and the entransy efficiency are applicable to the optimization of the ORC, while entransy dissipation is not. This conclusion is available no matter what kind of working fluid is used, nevertheless, the system performances and parameters may be much different. The results also indicate that when the hot stream condition (temperature or mass flow rate) varies, the entransy loss rate is the only parameter which always corresponds to the maximum power output.

Yadong Zhu; Zhe Hu; Yaodong Zhou; Liang Jiang; Lijun Yu

2014-01-01T23:59:59.000Z

78

Discussion of the internal heat exchanger's effect on the Organic Rankine Cycle  

Science Journals Connector (OSTI)

Abstract This paper explores the performances of IHE (Internal Heat Exchanger) in ORC (Organic Rankine Cycle) systems. Although previous studies hold multitudinous opinions, this study gives clear statements of IHE in both subcritical and supercritical ORC systems by setting a new model taking pressure drop in loops and acid dew point into consideration. Commonly used working fluids R123 and R600 are chosen for subcritical and supercritical cases separately. The temperature of the heat source applied is 200 °C and the mass flow rate of it is 1 kg/s. The analysis is accomplished by program Engineering Equation Solver. A modified method of calculating maximum heat exchange in IHE is given when modeling a supercritical cycle, because of the momentously changing specific heat near the critical point. Besides, a new approach is put forward to calculate the outlet temperature of the heat source and find the location of pinch point in supercritical cases. The results provide that IHE is beneficial to a subcritical case, but it improves system performance only in part of the low pressure stage in a supercritical case. Moreover, after the acid dew point Tad is taken into account, it is found that IHE is able to enlarge euphemistically the maximum system net output in a subcritical case. And in a supercritical case, the original evaporation pressure which does not conform to the rule Th,out > Tad is available now. It is revealed that the utilization of IHE will strengthen the applicability of the system.

Yadong Zhu; Zhe Hu; Yaodong Zhou; Liang Jiang; Lijun Yu

2014-01-01T23:59:59.000Z

79

Task report No. 3. Systems analysis of organic Rankine bottoming cycles. [Fuel cell power plant  

SciTech Connect

A model was developed that predicts the design performance and cost of a Fuel Cell/Rankine cycle powerplant. The Rankine cycle utilizes the rejected heat of an 11.3 MW phosphoric acid fuel cell powerplant. Improvements in the total plant heat rate and efficiency of up to 10% were attainalbe, using ammonia as the working fluid. The increase in total plant cost divided by the increase in total plant power ranged from $296/kW to $1069/kW for the cases run, and was a strong function of ambient temperature. The concept appears to be capable of producing substantial energy savings in large fuel cell powerplants, at reasonable costs. However, a much more detailed study that includes such factors as duty cycle, future cost of fuel and site meteorology needs to be done to prove the design for any potential site.

Bloomfield, D.; Fried, S.

1980-12-01T23:59:59.000Z

80

Exergy analysis of zeotropic mixtures as working fluids in Organic Rankine Cycles  

Science Journals Connector (OSTI)

Abstract The thermodynamic performance of non-superheated subcritical Organic Rankine Cycles (ORCs) with zeotropic mixtures as working fluids is examined based on a second law analysis. In a previous study, a mixture selection method based on a first law analysis was proposed. However, to assess the performance potential of zeotropic mixtures as working fluids the irreversibility distributions under different mixtures compositions are calculated. The zeotropic mixtures under study are: R245fa–pentane, R245fa–R365mfc, isopentane–isohexane, isopentane–cyclohexane, isopentane–isohexane, isobutane–isopentane and pentane–hexane. The second law efficiency, defined as the ratio of shaft power output and input heat carrier exergy, is used as optimization criterion. The results show that the evaporator accounts for the highest exergy loss. Still, the best performance is achieved when the condenser heat profiles are matched. An increase in second law efficiency in the range of 7.1% and 14.2% is obtained compared to pure working fluids. For a heat source of 150 °C, the second law efficiency of the pure fluids is in the range of 26.7% and 29.1%. The second law efficiency in function of the heat carrier temperature between 120 °C and 160 °C shows an almost linear behavior for all investigated mixtures. Furthermore, between optimized \\{ORCs\\} with zeotropic mixtures as working fluid the difference in second law efficiency varies less than 3 percentage points.

S. Lecompte; B. Ameel; D. Ziviani; M. van den Broek; M. De Paepe

2014-01-01T23:59:59.000Z

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


81

New efficiency charts for the optimum design of axial flow turbines for organic Rankine cycles  

Science Journals Connector (OSTI)

Abstract Turbine efficiency plays a key role in the design optimization of \\{ORCs\\} (organic Rankine cycles) and should be properly evaluated for an accurate estimate of the real power production. Its value is in general assumed as given in the design optimization procedure, without a check that it can be really achieved in the resulting working conditions. The peculiar properties of high molecular weight fluids markedly influence turbine design and ask for turbine design criteria specifically tailored to ORCs. In this work a meanline design procedure for single stage axial flow turbines is developed to find optimum turbine geometry and efficiency in a wide range of operating conditions. Unlike previous literature, real fluid properties and very recent loss models are implemented. The variation of the predicted turbine efficiency with loading coefficient, flow coefficient, specific speed and specific diameter is shown through new general maps that explicitly take into account the strong influence of compressibility and turbine size through the volumetric expansion ratio and size parameter, respectively. All these maps can be included in a general design optimization procedure of the ORC system to help select the optimum design point, overcoming any arbitrary assumptions on turbine efficiency.

Luca Da Lio; Giovanni Manente; Andrea Lazzaretto

2014-01-01T23:59:59.000Z

82

Potential of organic Rankine cycle using zeotropic mixtures as working fluids for waste heat recovery  

Science Journals Connector (OSTI)

Abstract The performance of the ORC (organic Rankine cycle) systems using zeotropic mixtures as working fluids for recovering waste heat of flue gas from industrial boiler is examined on the basis of thermodynamics and thermo-economics under different operating conditions. In order to explore the potential of the mixtures as the working fluids in the ORC, the effects of various mixtures with different components and composition proportions on the system performance have been analyzed. The results show that the compositions of the mixtures have an important effect on the ORC system performance, which is associated with the temperature glide during the phase change of mixtures. From the point of thermodynamics, the performance of the ORC system is not always improved by employing the mixtures as the working fluids. The merit of the mixtures is related to the restrictive conditions of the ORC, different operating conditions results in different conclusions. At a fixed pinch point temperature difference, the small mean heat transfer temperature difference in heat exchangers will lead to a larger heat transfer area and the larger total cost of the ORC system. Compared with the ORC with pure working fluids, the ORC with the mixtures presents a poor economical performance.

You-Rong Li; Mei-Tang Du; Chun-Mei Wu; Shuang-Ying Wu; Chao Liu

2014-01-01T23:59:59.000Z

83

Thermal Stability of Cyclopentane as an Organic Rankine Cycle Working Fluid  

SciTech Connect

Laboratory experiments were performed to aid in determining the maximum operating temperature for cyclopentane as an Organic Rankine Cycle working fluid. The thermochemical decomposition of cyclopentane was measured in a recirculation loop at 240 C, 300 C and 350 C at 43 bar in a glass-lined heated tube. It was determined that in the absence of air at the lower two temperatures, decomposition was minor after more than twelve days of continuous operation. At 240 C, the total cyclopentane decomposition products were approximately 65 parts per million (ppm) and at 300 C, total decomposition products were on the order of 270 ppm at the end of the experiment. At 350 C, decomposition products were significantly higher and reached 1,500 ppm. When the feed was contacted with air, the decomposition rate increased dramatically. Residues found in the reactor after the decomposition experiments were examined by a number of different techniques. The mass of the residues increased with experimental temperature, but was lower at the same temperature when the feed was contacted with air. Analysis of the residues suggested that the residues were primarily heavy saturated hydrocarbons.

Daniel M. Ginosar; Lucia M. Petkovic; Donna Post Guillen

2011-08-01T23:59:59.000Z

84

Statistical analysis of patent data relating to the organic Rankine cycle  

Science Journals Connector (OSTI)

Abstract This study analyzed patent data to explore the technological developments based on the organic Rankine cycle (ORC), which is one of the most economical and efficient methods for converting low-grade thermal energy into electricity. The patent data were obtained from the Thomson Innovation commercial database, which contains patent information from various countries and offices. After querying, filtering, and organizing the results into patent families in accordance with International Patent Documentation Center guidelines, this study analyzed data on 304 ORC-related patents. The results show that the number of patent applications increased gradually before 2006, and then rapidly from 2009 to 2011, primarily because of contributions from patent applications in China (CN) and the Republic of Korea (KR). The present findings indicate that 2009 is an important year regarding developments in ORC systems and the number of patent applications. Furthermore, the assignees from the United States (US) were the most prominent contributors. However, the most patent applications were filed in CN, indicating that the market for ORC systems in CN might offer the most potential for future development. This study also examined the top ten patent assignees, as well as the trends of the number of patent applications, size of patent families, and frequency of patent citations. The results show that all of the top ten assignees were from the US, CN, and KR. Moreover, most of them filed their patent applications in recent years, particularly after 2008. The results further indicate that the most active assignee is currently General Electric Company (US). In addition, the top five patent families and the five most frequently cited patents are briefly reviewed and discussed. The patent data analysis results indicate that the technology life cycle status of the ORC is currently in the growth stage.

Ben-Ran Fu; Sung-Wei Hsu; Chih-Hsi Liu; Yu-Ching Liu

2014-01-01T23:59:59.000Z

85

THE TRANSPOSED CRITICAL TEMPERATURE RANKINE THERMODYNAMIC CYCLE  

E-Print Network (OSTI)

Process Program for Geothermal Power Plant Cycles,'*for a Rankine Cycle Geothermal Power Plant," Proceedings,Design and Optimize Geothermal Power Cycles," presented at

Pope, William L.

2012-01-01T23:59:59.000Z

86

Organic Rankine Cycle System Preliminary Design with Corn Cob Biomass Waste Burning as Heat Source  

Science Journals Connector (OSTI)

Abstract The renewable energy source potencies in Indonesia are needed to be utilized to fulfill the electricity requirement in rural or remote area that not yet get electricity. One of the potency is biomass waste. Therefore, this paper discusses about the electricity generation preliminary design of Organic Rankine Cycle (ORC) system with corn cob biomass waste burning as heat source, so it can be obtained the theoretic corn farm area requirement, electricity power, and thermal efficiency at heat source temperature and flow rate variations. Corn cob burning temperature can heat up the heating fluid that is heated by boiler with corn cob as the biomass fuel. Furthermore, that heating fluid is used as ORC electricity generation heat source. The independent variables in this study are the heating fluid temperature which varied between 110, 120, and 130oC, and the heating fluid flow rate that varied between 100, 150, and 200 liter/minute. \\{R141b\\} is selected to be the working fluid, palm oil is used for heating fluid and water as cooling fluid. The calculation results that the theoretic electricity power, thermal efficiency, and corn farm area requirement, respectively, are in the range of 3.5-8.5 kW, 9.2-10.3%, and 49.5-101.1 hectare/year. All of the highest range values are resulted at the highest temperature and flow rate, 130oC and 200 liter/minute. This result shows that corn cob burning heat is potential to be utilized as electricity generation heat source for rural society, particularly for some areas that have been studied.

Nur Rohmah; Ghalya Pikra; Agus Salim

2013-01-01T23:59:59.000Z

87

Hybridisation of solar and geothermal energy in both subcritical and supercritical Organic Rankine Cycles  

Science Journals Connector (OSTI)

Abstract A supercritical Organic Rankine Cycle (ORC) is renowned for higher conversion efficiency than the conventional ORC due to a better thermal match (i.e. reduced irreversibility) presented in the heat exchanger unit. This improved thermal match is a result of the obscured liquid-to-vapor boundary of the organic working fluid at supercritical states. Stand-alone solar thermal power generation and stand-alone geothermal power generation using a supercritical ORC have been widely investigated. However, the power generation capability of a single supercritical ORC using combined solar and geothermal energy has not been examined. This paper thus investigates the hybridisation of solar and geothermal energy in a supercritical ORC to explore the benefit from the potential synergies of such a hybrid platform. Its performances were also compared with those of a subcritical hybrid plant, stand-alone solar and geothermal plants. All simulations and modelling of the power cycles were carried out using process simulation package Aspen HYSYS. The performances of the hybrid plant were then assessed using technical analysis, economic analysis, and the figure of merit analysis. The results of the technical analysis show that thermodynamically, the hybrid plant using a supercritical ORC outperforms the hybrid plant using a subcritical ORC if at least 66% of its exergy input is met by solar energy (i.e. a solar exergy fraction of >66%), namely producing 4–17% more electricity using the same energy resources. Exergy analysis shows that with a solar exergy fraction of more than 66% the exergetic efficiency of the hybrid plant is about 27–34% for the supercritical hybrid plant and 23–32% for the subcritical hybrid plant. The figure of merit analysis indicates that the hybrid plant produces a maximum of 15% (using a subcritical ORC) and 19% (using a supercritical ORC) more annual electricity than the two stand-alone plants. Economically, the hybrid plant using the supercritical ORC has a solar-to-electricity cost of approximately 1.5–3.3% less than those of the subcritical scenario.

Cheng Zhou

2014-01-01T23:59:59.000Z

88

Definition: Rankine cycle | Open Energy Information  

Open Energy Info (EERE)

Rankine cycle Rankine cycle Jump to: navigation, search Dictionary.png Rankine cycle Sometimes referred to as the steam cycle. Fuel is used to heat a liquid to produce a high pressure gas that expands and produces work, such as turning a turbine; when the turbine is connected to a generator, it produces electricity. Usually water is the liquid used in the Rankine cycle (to produce steam), but other liquids can also be used. The exhaust vapor expelled from the turbine condenses and the liquid is pumped back to the boiler to repeat the cycle.[1][2] View on Wikipedia Wikipedia Definition The Rankine cycle is a mathematical model that is used to predict the performance of steam engines. The Rankine cycle is an idealised thermodynamic cycle of a heat engine that converts heat into mechanical

89

Organic Rankine-Cycle Power Systems Working Fluids Study: Topical report No. 3, 2-methylpyridine/water  

SciTech Connect

A mixture of 35 mole percent (mol %) 2-methylpyridine and 65 mol % water was tested at 575, 625, and 675/degree/F in a dynamic loop. Samples of the degraded fluid were chemically analyzed to determine the identities of major degradation products and the quantity of degradation. Computed degradation rates were found to be higher than those for Fluorinol 85 or toluene. For this reason (and other reasons, related to fluid handling), other fluids are recommended as the first choice for service in organic Rankine-cycle systems in preference to 2-methylpyridine/water. 7 refs., 39 figs., 39 tabs.

Cole, R.L.; Demirgian, J.C.; Allen, J.W.

1987-09-01T23:59:59.000Z

90

[en] SIMULATION OF AN ORGANIC RANKINE CYCLE POWERED BY SOLAR ENERGY.  

E-Print Network (OSTI)

??[pt] Esta simulação considera um ciclo Rankine que utiliza um fluido de trabalho orgânico, com a particularidade que a fonte de energia de entrada ao… (more)

ERNESTO JAVIER RUANO HERRERIA

2013-01-01T23:59:59.000Z

91

Multiple Rankine topping cycles offer high efficiency  

SciTech Connect

The efficiency of a Rankine cycle is primarily determined by the temperatures of heat addition and heat rejection. However, no working fluid has been identified that will operate in a Rankine cycle over an extremely wide temperature range. Multiple Rankine topping cycles offer a technique for achieving high thermal efficiencies in power plants by allowing the use of several working fluids to span larger temperature ranges.

McWhirter, J.D. [Idaho State Univ., Pocatello, ID (United States)

1997-10-01T23:59:59.000Z

92

Rankine cycle system and method  

DOE Patents (OSTI)

A Rankine cycle waste heat recovery system uses a receiver with a maximum liquid working fluid level lower than the minimum liquid working fluid level of a sub-cooler of the waste heat recovery system. The receiver may have a position that is physically lower than the sub-cooler's position. A valve controls transfer of fluid between several of the components in the waste heat recovery system, especially from the receiver to the sub-cooler. The system may also have an associated control module.

Ernst, Timothy C.; Nelson, Christopher R.

2014-09-09T23:59:59.000Z

93

Thermodynamic and design considerations of organic Rankine cycles in combined application with a solar thermal gas turbine  

Science Journals Connector (OSTI)

Concentrated Solar Power (CSP) technologies are considered to provide a significant contribution for the electric power production in the future. Different kinds of technologies are presently in operation or under development, e.g. parabolic troughs, central receivers, solar dish systems and Fresnel reflectors. This paper takes the focus on central receiver technologies, where the solar radiation is concentrated by a field of heliostats in a receiver on the top of a tall tower. To get this CSP technology ready for the future, the system costs have to reduce significantly. The main cost driver in such kind of CSP technologies are the huge amount of heliostats. To reduce the amount of heliostats, and so the investment costs, the efficiency of the energy conversion cycle becomes an important issue. An increase in the cycle efficiency results in a decrease of the solar heliostat field and thus, in a significant cost reduction. The paper presents the results of a thermodynamic model of an Organic Rankine Cycle (ORC) for combined cycle application together with a solar thermal gas turbine. The gas turbine cycle is modeled with an additional intercooler and recuperator and is based on a typical industrial gas turbine in the 2 MW class. The gas turbine has a two stage radial compressor and a three stage axial turbine. The compressed air is preheated within a solar receiver to 950°C before entering the combustor. A hybrid operation of the gas turbine is considered. In order to achieve a further increase of the overall efficiency, the combined operation of the gas turbine and an Organic Rankine Cycle is considered. Therefore an ORC has been set up, which is thermally connected to the gas turbine cycle at two positions. The ORC can be coupled to the solar-thermal gas turbine cycle at the intercooler and after the recuperator. Thus, waste heat from different cycle positions can be transferred to the ORC for additional production of electricity. Within this investigation different working fluids and ORC conditions have been analyzed in order to evaluate the best configuration. The investigations have been performed by application of improved thermodynamic and process analysis tools, which consider the real gas behavior of the analyzed fluids. The results show that by combined operation of the solar thermal gas turbine and the ORC, the combined cycle efficiency is approximately 4%-points higher than in the solar-thermal gas turbine cycle.

R Braun; K Kusterer; T Sugimoto; K Tanimura; D Bohn

2013-01-01T23:59:59.000Z

94

Experiments and thermal modeling on hybrid energy supply system of gas engine heat pumps and organic Rankine cycle  

Science Journals Connector (OSTI)

Abstract This paper presents a hybrid energy supply system, which is composed of two subsystems (gas engine-driven heat pump system (GEHP) and organic Rankine cycle system (ORC)) and three major thermodynamic cycles (the vapor compression refrigeration cycle, the internal combustion gas engine cycle and ORC). In order to convert the low-grade gas engine waste heat into high-grade electricity, the ORC system is built up using R245fa, \\{R152a\\} and R123 as working fluids, and the ORC thermal model is also developed. Meanwhile, experiments of \\{GHEPs\\} in cooling mode are conducted, and several factors which influence the cooling performance are also discussed. The results indicate that the cooling capacity, gas engine energy consumption, gas engine waste heat increase with increasing of gas engine speed and decrease with decreasing of evaporator water inlet temperature. The waste heat recovered from gas engine is more than 55% of gas engine energy consumption. F6urthermore, R123 in ORC system yields the highest thermal and exergy efficiency of 11.84% and 54.24%, respectively. Although, thermal and exergy efficiency of \\{R245fa\\} is 11.42% and 52.25% lower than that of R123, its environmental performance exhibits favorable utilization for ORC using gas engine waste heat as low-grade heat source.

Huanwei Liu; Qiushu Zhou; Haibo Zhao; Peifeng Wang

2015-01-01T23:59:59.000Z

95

Three-dimensional off-design numerical analysis of an organic Rankine cycle radial-inflow turbine  

Science Journals Connector (OSTI)

Abstract Optimisation of organic Rankine cycles (ORCs) for binary cycle applications could play a major role in determining the competitiveness of low to moderate renewable sources. An important aspect of the optimisation is to maximise the turbine output power for a given resource. This requires careful attention to the turbine design notably through numerical simulations. Challenges in the numerical modelling of radial-inflow turbines using high-density working fluids still need to be addressed in order to improve the turbine design and better optimise ORCs. This paper presents preliminary 3D numerical simulations of a high-density radial-inflow ORC turbine in sensible geothermal conditions. Following extensive investigation of the operating conditions and thermodynamic cycle analysis, the refrigerant \\{R143a\\} is chosen as the high-density working fluid. The 1D design of the candidate radial-inflow turbine is presented in details. Furthermore, commercially-available software Ansys-CFX is used to perform preliminary steady-state 3D CFD simulations of the candidate \\{R143a\\} radial-inflow turbine for a number of operating conditions including off-design conditions. The real-gas properties are obtained using the Peng–Robinson equations of state. The thermodynamic ORC cycle is presented. The preliminary design created using dedicated radial-inflow turbine software Concepts-Rital is discussed and the 3D CFD results are presented and compared against the meanline analysis.

Emilie Sauret; Yuantong Gu

2014-01-01T23:59:59.000Z

96

Organic Rankine-cycle power systems working fluids study: Topical report No. 1: Fluorinol 85. [85 mole % trofluoroethanol in water  

SciTech Connect

An investigation to experimentally determine the thermal stability limits and degradation rates of Fluorinol 85 as a function of maximum cycle temperatures was initiated in 1982. Following the design and construction of a dynamic test loop capable of simulating the thermodynamic conditions of possible prototypical organic Rankine-cycle (ORC) power systems, several test runs were completed. The Fluorinol 85 test loop was operated for about 3800 h, covering a temperature range of 525-600/sup 0/F. Both liquid and noncondensable vapor (gas) samples were drawn periodically and analyzed using capillary column gas chromatography, gas chromatography/mass spectrometry and mass spectrometry. Results indicate that Fluorinol 85 would not decompose significantly over an extended period of time, up to a maximum cycle temperature of 550/sup 0/F. However, 506-h data at 575/sup 0/F show initiation of significant degradation. The 770-h data at 600/sup 0/F, using a fresh charge of Fluorinol 85, indicate an annual degradation rate of more than 17.2%. The most significant degradation product observed is hydrofluoric acid, which could cause severe corrosion in an ORC system. Devices to remove the hydrofluoric acid and prevent extreme temperature excursions are necessary for any ORC system using Fluorinol 85 as a working fluid.

Jain, M.L.; Demirgian, J.C.; Cole, R.L.

1986-09-01T23:59:59.000Z

97

Determination of Thermal-Degradation Rates of Some Candidate Rankine-Cycle Organic Working Fluids for Conversion of Industrial Waste Heat Into Power  

E-Print Network (OSTI)

DETERMINATION OF THERMAL-DEGRADATION RATES OF SOME CANDIDATE RANKINE-CYCLE ORGANIC WORKING FLUIDS FOR CONVERSION OF INDUSTRIAL WASTE HEAT INTO POWER Mohan L. Jain, Jack Demirgian, John L. Krazinski, and H. Bushby Argonne National Laboratory..., Argonne, Illinois Howard Mattes and John Purcell U.S. Department of Energy ABSTRACT Serious concerns over the long-term thermal In a previous study [1] based on systems stability of organic working fluids and its effect analysis and covering...

Jain, M. L.; Demirgian, J.; Krazinski, J. L.; Bushby, H.; Mattes, H.; Purcell, J.

1984-01-01T23:59:59.000Z

98

Theoretical research on working fluid selection for a high-temperature regenerative transcritical dual-loop engine organic Rankine cycle  

Science Journals Connector (OSTI)

Abstract In this paper, a regenerative transcritical dual-loop organic Rankine cycle is proposed to recover the waste heat of the exhaust, engine coolant and all the residual heat of the HT loop. Double regenerators are adopted in this system. Transcritical cycles are used in both loops. Hexamethyldisiloxane (MM), octamethyl cyclotetrasiloxane (D4), octamethyltrisiloxane (MDM), cyclohexane, toluene and n-decane are chosen as the candidate working fluids of the HT loop and \\{R143a\\} is chosen as the working fluid of the LT loop. Influences of inlet temperature of turbine THT (T3) on mass flow rates (mf,HT and mf,LT), net output power (Wnet), energy conversion efficiency (?ec), volumetric expansion ratio (VER), ratio of power consumed to power output (COR) and component irreversibility are analyzed and performance comparison of these working fluids is also evaluated. Results show that toluene possesses the maximum Wnet (42.46 kW), highest ?e (51.92%) and ?ec (12.77%). The increase of T3 worsens system performance, decreasing Wnet, ?e and ?ec. Condenser CLT and turbine TLT possess the least system irreversibility. In addition, turbines and exhaust evaporators are optimized components.

Hua Tian; Lina Liu; Gequn Shu; Haiqiao Wei; Xingyu Liang

2014-01-01T23:59:59.000Z

99

Thermal stability of working fluids for organic Rankine cycles: An improved survey method and experimental results for cyclopentane, isopentane and n-butane  

Science Journals Connector (OSTI)

Abstract In this work we present an improved survey method for the evaluation of the thermal stability of working fluids for organic Rankine cycles. The method presented here represents an improvement of a test methodology already used in literature, based on the analysis of temperature and pressure measurements of a fluid subjected to increasing thermal stress temperatures. Compared to the already known methodology, the survey technique presented in this work offers a different evaluation of the measured vapor pressure deviations and a different estimation method of the decomposition rates. After the description of the experimental apparatus and of the test methodology, we present and discuss some experimental results of the thermal stability of three fluids of interest for organic Rankine cycle applications, namely Cyclopentane, Isopentane and n-Butane, in the temperature range between 220 °C and 350 °C.

Marco Pasetti; Costante M. Invernizzi; Paolo Iora

2014-01-01T23:59:59.000Z

100

Experimental study and CFD approach for scroll type expander used in low-temperature organic Rankine cycle  

Science Journals Connector (OSTI)

Abstract This study focuses on experimental test of scroll type expanders in low-temperature organic Rankine cycle (ORC) system. In this circuit, lubricant has been mixed with \\{R245fa\\} as working fluid. In this experiment, two scroll expanders with different built-in volume ratio have been experimentally tested. Main test parameters considered are the pressure difference and the rotational speed of the expanders. It is found that the expander performance could be significantly improved when bigger built-in volume ratio is used. However the internal leakage and friction loss are vital factors to influence expander performance. The maximum shaft power output by expander of 1.77 kW and deliver electricity by generator of 1.375 kW. A Computational Fluid Dynamics approach (CFD) has been employed for preliminary investigation on the thermal-hydraulic behavior of the scroll type expanders. The simulation result shows that unbalance pressure distribution were occurred in the expander by means of top scroll wrap has been modified.

Jen-Chieh Chang; Chao-Wei Chang; Tzu-Chen Hung; Jaw-Ren Lin; Kuo-Chen Huang

2014-01-01T23:59:59.000Z

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101

A study on lubricant oil supply for positive-displacement expanders in small-scale organic Rankine cycles  

Science Journals Connector (OSTI)

Abstract Positive-displacement expanders, which are widely used in small-scale \\{ORCs\\} (Organic Rankine Cycles), need reliable LOS (Lubricant Oil Supply) to get well lubrication and sealing. In the present paper, the characteristics of two traditional LOS schemes are examined. Moreover, a modified one is proposed. Analyses of those elements that lead to work loss of lubricant oil supply have been carried out for all the three LOS schemes. The work loss of lubricant oil supply, which is caused by the employment of lubricant oil pumps, pressure drop in lubricant oil separator and other components contributing to work loss, is evaluated by a definition of WLLS (Work Loss Factor of Lubrication Oil Supply). Based on the thermodynamic model of ORC established, the calculation methods of WLLS are presented. Through analyses of LOS schemes and calculation of WLLS in two typical ORCs, it was found that the traditional LOS schemes either can not work reliably, or might cause up to 11.5% and 9.5% power decrease. The values can be reduced by half in the proposed LOS scheme, which can also work reliably. Accompanied with the advantages, the defects of the new scheme were also investigated.

Biao Lei; Yu-Ting Wu; Wei Wang; Jing-Fu Wang; Chong-Fang Ma

2014-01-01T23:59:59.000Z

102

Performance Analysis of Exhaust Waste Heat Recovery System for Stationary CNG Engine Based on Organic Rankine Cycle  

Science Journals Connector (OSTI)

Abstract In order to improve the electric efficiency of a stationary compressed natural gas (CNG) engine, a set of organic Rankine cycle (ORC) system with internal heat exchanger (IHE) is designed to recover exhaust energy that is used to generate electricity. R416A is selected as the working fluid for the waste heat recovery system. According to the first and second laws of thermodynamics, the performances of the ORC system for waste heat recovery are discussed based on the analysis of engine exhaust waste heat characteristics. Subsequently, the stationary CNG engine-ORC with IHE combined system is presented. The electric efficiency and the brake specific fuel consumption (BSFC) are introduced to evaluate the operating performances of the combined system. The results show that, when the evaporation pressure is 3.5MPa and the engine is operating at the rated condition, the net power output and the thermal efficiency of the ORC system with IHE can reach up to 62.7kW and 12.5%, respectively. Compared with the stationary CNG engine, the electric efficiency of the combined system can be increased by a maximum 6.0%, while the BSFC can be reduced by a maximum 5.0%.

Songsong Song; Hongguang Zhang; Zongyong. Lou; Fubin Yang; Kai Yang; Hongjin Wang; Chen Bei; Ying Chang; Baofeng Yao

2014-01-01T23:59:59.000Z

103

Dynamic performance estimation of small-scale solar cogeneration with an organic Rankine cycle using a scroll expander  

Science Journals Connector (OSTI)

Small-scale solar thermal cogeneration shows promise as an effective way to get increased benefit out of a given solar availability, since it does not waste potential during summer after the water capacity is heated. In this paper a scroll expander is tested in a small organic Rankine cycle (ORC) and used to calibrate a static expander model. Validation of the scroll expander model shows agreement generally within 10% for the shaft power, 5% for the rotational speed and 6 K for the exhaust temperature, with some outliers at very low pressure ratios. This calibrated model is then incorporated into a larger dynamic model of a solar thermal cogeneration system, designed for some larger dwelling unit or small commercial establishment that requires a larger volume of hot water. An annual simulation is conducted using a collector area of 50 m2, and the scroll expander shows a maximum isentropic efficiency of 59% while the ORC efficiency is 3.47%. The total energy produced is 1710 kWh and the hot water available is on average 2540 L/day. The maximum instantaneous power that can be produced by the system is 676 W, and it is possible to shift the time period that the system is producing power to match the peak demand period by adjusting the solar store volume.

B. Twomey; P.A. Jacobs; H. Gurgenci

2013-01-01T23:59:59.000Z

104

An assessment of solar-powered organic Rankine cycle systems for combined heating and power in UK domestic applications  

Science Journals Connector (OSTI)

Abstract Performance calculations are presented for a small-scale combined solar heat and power (CSHP) system based on an Organic Rankine Cycle (ORC), in order to investigate the potential of this technology for the combined provision of heating and power for domestic use in the UK. The system consists of a solar collector array of total area equivalent to that available on the roof of a typical UK home, an ORC engine featuring a generalised positive-displacement expander and a water-cooled condenser, and a hot water storage cylinder. Preheated water from the condenser is sent to the domestic hot water cylinder, which can also receive an indirect heating contribution from the solar collector. Annual simulations of the system are performed. The electrical power output from concentrating parabolic-trough (PTC) and non-concentrating evacuated-tube (ETC) collectors of the same total array area are compared. A parametric analysis and a life-cycle cost analysis are also performed, and the annual performance of the system is evaluated according to the total electrical power output and cost per unit generating capacity. A best-case average electrical power output of 89 W (total of 776 kW h/year) plus a hot water provision capacity equivalent to ?80% of the total demand are demonstrated, for a whole system capital cost of £2700–£3900. Tracking \\{PTCs\\} are found to be very similar in performance to non-tracking \\{ETCs\\} with an average power output of 89 W (776 kW h/year) vs. 80 W (701 kW h/year).

James Freeman; Klaus Hellgardt; Christos N. Markides

2015-01-01T23:59:59.000Z

105

Single stage rankine and cycle power plant  

SciTech Connect

The specification describes a Rankine cycle power plant of the single stage type energized by gasified freon, the latter being derived from freon in the liquid state in a boiler provided in the form of a radio frequency heating cell adapted at low energy input to effect a rapid change of state from liquid freon at a given temperature and pressure to gaseous freon of relatively large volume, thereby to drive a Rankine cycle type of engine recognized in the prior art as a steam engine type of engine of the piston or turbine type.

Closs, J.J.

1981-10-13T23:59:59.000Z

106

Final Report: Modifications and Optimization of the Organic Rankine Cycle to Improve the Recovery of Waste Heat  

SciTech Connect

This research and development (R&D) project exemplifies a shared public private commitment to advance the development of energy efficient industrial technologies that will reduce the U.S. dependence upon foreign oil, provide energy savings and reduce greenhouse gas emissions. The purpose of this project was to develop and demonstrate a Direct Evaporator for the Organic Rankine Cycle (ORC) for the conversion of waste heat from gas turbine exhaust to electricity. In conventional ORCs, the heat from the exhaust stream is transferred indirectly to a hydrocarbon based working fluid by means of an intermediate thermal oil loop. The Direct Evaporator accomplishes preheating, evaporation and superheating of the working fluid by a heat exchanger placed within the exhaust gas stream. Direct Evaporation is simpler and up to 15% less expensive than conventional ORCs, since the secondary oil loop and associated equipment can be eliminated. However, in the past, Direct Evaporation has been avoided due to technical challenges imposed by decomposition and flammability of the working fluid. The purpose of this project was to retire key risks and overcome the technical barriers to implementing an ORC with Direct Evaporation. R&D was conducted through a partnership between the Idaho National Laboratory (INL) and General Electric (GE) Global Research Center (GRC). The project consisted of four research tasks: (1) Detailed Design & Modeling of the ORC Direct Evaporator, (2) Design and Construction of Partial Prototype Direct Evaporator Test Facility, (3) Working Fluid Decomposition Chemical Analyses, and (4) Prototype Evaluation. Issues pertinent to the selection of an ORC working fluid, along with thermodynamic and design considerations of the direct evaporator, were identified. The FMEA (Failure modes and effects analysis) and HAZOP (Hazards and operability analysis) safety studies performed to mitigate risks are described, followed by a discussion of the flammability analysis of the direct evaporator. A testbed was constructed and the prototype demonstrated at the GE GRC Niskayuna facility.

Donna Post Guillen; Jalal Zia

2013-09-01T23:59:59.000Z

107

Rankine cycle waste heat recovery system  

DOE Patents (OSTI)

This disclosure relates to a waste heat recovery (WHR) system and to a system and method for regulation of a fluid inventory in a condenser and a receiver of a Rankine cycle WHR system. Such regulation includes the ability to regulate the pressure in a WHR system to control cavitation and energy conversion.

Ernst, Timothy C.; Nelson, Christopher R.

2014-08-12T23:59:59.000Z

108

Advanced Organic Vapor Cycles for Improving Thermal Conversion Efficiency in Renewable Energy Systems  

E-Print Network (OSTI)

SK Wang, "A review of Organic Rankine Cycles (ORCs) for thePerformances of Organic Rankine Cycles under part-load andChemistry: the Organic Rankine Cycle. ” d Nark Mirolli. “The

Ho, Tony

2012-01-01T23:59:59.000Z

109

Rankine/Rankine cycle gas-fired heat pump. Final report Mar 79-Mar 82  

SciTech Connect

A Rankine/Rankine cycle gas-fired heat pump was developed for residential application. The system consists of two rotating elements: a high-speed turbomachine core and a low-speed assembly, which includes a rotating vapor generator and heat exchangers. Inherent in the rotation of these components is the elimination of separate pumps, fans, reversing valves, and expansion valves. One Rankine cycle, the power cycle, drives the turbine and gives up its excess heat to the service air. The second Rankine cycle, the refrigerant cycle, is pressurized by a turbine-powered centrifugal compressor. The dual-cycle system uses two organic heat transfer fluids. The power cycle uses a developmental, moderate-temperature fluid (designated Fluid B), and the refrigeration cycle uses Freon R-113. These two fluids are compatible and missible in each other. Therefore, positive seals are not required. A laboratory prototype model was developed to the point of initiating proof-of-concept demonstration. A conceptual design study of an end-product model was conducted, and a product specification for a family of heat pump systems with various performance enhancement options was generated. The maximum realizable performance end-product heat pump system has a projected overall coefficient of performance (OCOP) of 0.79 at 37,500 Btu/hr cooling and an OCOP of 1.49 at 60,000 Btu/hr heating load. This end-product model has an estimated manufacturing cost of $1460 (in 1982 dollars) and could be available as a commercial product in the early 1990s.

Enbar, E.; Moriarty, R.

1982-06-30T23:59:59.000Z

110

Design and Exergy Analysis of Combined Rankine Cycle Using LNG Cold Energy  

Science Journals Connector (OSTI)

Abstract In this study, a 90 MWe combined Rankine cycle utilizing LNG cold exergy was proposed. Utilizing LNG cold exergy and waste heat from the conventional steam cycle, this process was able to generate additional power in the CO2 organic Rankine cycle (ORC). A conventional steam cycle generates only 42 MW electric power; this combined Rankine cycle produced more than twice as much power as the conventional steam cycle while consuming the same amount of fossil fuel. Through parameter sensitivity analysis and exergy analysis, the optimum design and operating conditions were also determined. Finally, reduction of the power plant de-rate by introducing a CO2 capture process was also analyzed.

Ung Lee; Chonghun Han

2014-01-01T23:59:59.000Z

111

Working fluids for rankine cycle  

SciTech Connect

This patent describes a method for converting thermal energy into mechanical energy through the utilization of a cycle consisting of: (1) vaporizing, with heating, a mixture selected from the group of (a) 60 to 95% by weight of chlorodifluoromethane and 5 to 40% by weight of difluoroethane; and (b) 3 to 40% by weight of chlorodifluoromethane and 60 to 97% by weight of dichlorotetrafluoroethane; (2) expanding the vapor in an expansion device to produce mechanical energy; and (3) compressing the vapor by a pump and cooling the vapor to condense the vapor.

Enjo, N.; Aomi, H.; Noguchi, M.; Ide, S.

1986-01-07T23:59:59.000Z

112

Rankine bottoming cycle safety analysis. Final report  

SciTech Connect

Vector Engineering Inc. conducted a safety and hazards analysis of three Rankine Bottoming Cycle Systems in public utility applications: a Thermo Electron system using Fluorinal-85 (a mixture of 85 mole % trifluoroethanol and 15 mole % water) as the working fluid; a Sundstrand system using toluene as the working fluid; and a Mechanical Technology system using steam and Freon-II as the working fluids. The properties of the working fluids considered are flammability, toxicity, and degradation, and the risks to both plant workers and the community at large are analyzed.

Lewandowski, G.A.

1980-02-01T23:59:59.000Z

113

Method for processing LNG for rankine cycle  

SciTech Connect

A method is disclosed for processing lng using a mixed heat medium for performing a rankine cycle to gasify the lng. The medium is prepared by batch distillation using only lng. The method comprises the steps of condensing an upflow vapor in a single distillation column employing part of the lng in an lng batch distillation cycle, venting one fraction having low boiling point components mainly containing methane, and accumulating the other fractions containing ethane and components heavier than ethane. The supply of lng to be distilled in the column is halted. A total condensing operation is performed in which the other fractions are sequentially condensed by part of the lng at the condenser to sequentially recover and mix each component with the other fractions. Lng is added as the methane component to the recovered mixture of components to prepare a mixed heat medium consisting of components selected from hydrocarbons having 1-6 carbon atoms, or hydrocarbons having 1-6 carbon atoms and nitrogen. The mixed heat medium is stored. A mixed heat medium vapor generated by heat input to the stored mixed heat medium is condensed by lng and returned to the mixed heat medium; collection and complete gasification of the low boiling point components mainly containing methane and the lng is gasified by condensation to provide an lng vapor gas. Lng is gasified by performing the rankine cycle with the mixed heat medium.

Aoki, I.; Matsumoto, O.

1983-06-14T23:59:59.000Z

114

Integrated Rankine bottoming cycle for diesel truck engines  

SciTech Connect

This study assessed the feasibility of incorporating a Rankine bottoming cycle into a diesel truck engine. An organic Rankine bottoming cycle (ORBC) previously demonstrated by the US Department of Energy in a heavy-duty, long-haul truck reduced the truck's fuel consumption by about 12%. However, that system was considered too complex and costly to be commercialized. The integrated Rankine bottoming cycle (IRBC) described here is expected to be simpler and less costly than the ORBC. In the IRBC, one cylinder of a six-cylinder diesel truck engine will be used for power recovery, instead of the turbine and reduction gears of the ORBC; engine coolant will serve as the working fluid; and the engine radiator will also serve as the condenser. Toluene and steam were considered as working fluids in this assessment, and we concluded that steam (at 1000 psi, partially vaporized to about 33% saturation in the cylinder head, and superheated in an evaporator) would be the more practical of the two. Both heat exchangers are smaller than those of the ORBC system, but may pose a challenge in an under-the-hood installation. Overall, the concept appears feasible. 13 refs., 9 figs., 7 tabs.

Sekar, R.; Cole, R.L.

1987-09-01T23:59:59.000Z

115

High-Temperature Components for Rankine-Cycle-Based Waste Heat...  

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

Components for Rankine-Cycle-Based Waste Heat Recovery Systems on Combustion Engines High-Temperature Components for Rankine-Cycle-Based Waste Heat Recovery Systems on...

116

Solar Trough Organic Rankine Electricity System (STORES) Stage 1: Power Plant Optimization and Economics; November 2000 -- May 2005  

SciTech Connect

Report regarding a Stage 1 Study to further develop the concept of the Solar Trough Organic Rankine Cycle Electricity Systems (STORES).

Prabhu, E.

2006-03-01T23:59:59.000Z

117

Optimal Efficiency of a Solar Pond and a Rankine Cycle System  

Science Journals Connector (OSTI)

The optimal efficiency of a solar pond — Rankine cycle system is found analytically. The optimum for...

M. H. Cobble; A. R. Shouman

1987-01-01T23:59:59.000Z

118

Design of the ORC (organic Rankine cycle) condensation temperature with respect to the expander characteristics for domestic CHP (combined heat and power) applications  

Science Journals Connector (OSTI)

Abstract Domestic CHP (combined heat and power) generation is one new application of the ORC (organic Rankine cycle). An environment temperature fluctuation of 40 °C through the year is common in many areas, where the consumer's demand on heat follows a seasonal cycle. In no demand periods the ORC shall work under lower condensation temperature for more efficient power generation. Off-design operation will be executed, accompanied with a degraded performance of the ORC components especially the expander. The design of the condensation temperature herein becomes crucial. It influences the ORC efficiency in both the CHP and SPG (solo power generation) modes. If the condensation temperature is designed simply based on the CHP mode, the power conversion in the SPG mode will suffer from low expander efficiency. An optimum design of the condensation temperature involves a compromise between the power outputs in the two modes. This paper aims to determine the optimum design condensation temperature for the ORC-CHP system. A new concept, namely the threshold condensation temperature, is introduced and found to be important to the design and operation strategies of the system. The results indicate that via a careful design of the condensation temperature, the annual power output can be increased by 50%.

Jing Li; Gang Pei; Jie Ji; Xiaoman Bai; Pengcheng Li; Lijun Xia

2014-01-01T23:59:59.000Z

119

A study of the optimal operating conditions in the organic Rankine cycle using a turbo-expander for fluctuations of the available thermal energy  

Science Journals Connector (OSTI)

Abstract The organic Rankine cycle is widely used to obtain electric power from renewable energy sources, such as solar energy, geothermal energy, and waste thermal energy. In a typical ORC, a turbo-expander or volumetric expander is applied to convert the thermal energy to mechanical energy. The turbo-expander is widely used for large-scale output power because it has merits when used with large mass flowrates; the scroll expander is used for small-scale output power. In \\{ORCs\\} that produce small-scale output power, the available thermal energy as a renewable heat source usually cannot be supplied continuously. For fluctuating levels of available thermal energy, positive displacement machine has difficulty in adjusting the mass flowrate. In order to regulate the mass flowrate for varying thermal energies, a small-scale radial-type turbine and supersonic nozzles were designed specifically for this study. \\{R245fa\\} was used as the working fluid, and the thermodynamic properties of the working fluid in the cycle were predicted on the basis of the designed turbine blade and nozzle shape even though the mass flowrates were varied. The output powers at the off-design operations were predicted for the full range of 30 kW according to the number of nozzles used.

Soo-Yong Cho; Chong-Hyun Cho; Kook-Young Ahn; Young Duk Lee

2014-01-01T23:59:59.000Z

120

Thermodynamic and economic optimizations of a waste heat to power plant driven by a subcritical ORC (Organic Rankine Cycle) using pure or zeotropic working fluid  

Science Journals Connector (OSTI)

Abstract This paper carried out the thermodynamic and economic optimizations of a subcritical ORC (Organic Rankine Cycle) using a pure or a zeotropic mixture working fluid. Two pure organic compounds, i.e. n-pentane and R245fa, and their mixtures with various concentrations were used as ORC working fluid for this study. Two optimizations, i.e. exergy efficiency maximization and LCOE (Levelized Cost of Electricity) minimization, were performed to find out the optimum operating conditions of the system and to determine the best working fluid from the studied media. Hot water at temperature of 150 °C and pressure of 5 bars was used to simulate the heat source medium. Whereas, cooling water at temperature of 20 °C was considered to be the heat sink medium. The mass flow rate of heat source is fixed at 50 kg/s for the optimizations. According to the results, the n-pentane-based ORC showed the highest maximized exergy efficiency (53.2%) and the lowest minimized LCOE (0.0863 $/kWh). Regarding \\{ORCs\\} using zeotropic working fluids, 0.05 and 0.1 \\{R245fa\\} mass fraction mixtures present the comparable economic features and thermodynamic performances to the system using n-pentane at minimum LCOE. The ORC using \\{R245fa\\} represents the least profitable system.

Van Long Le; Abdelhamid Kheiri; Michel Feidt; Sandrine Pelloux-Prayer

2014-01-01T23:59:59.000Z

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


121

Performance analysis of regenerative organic Rankine cycle (RORC) using the pure working fluid and the zeotropic mixture over the whole operating range of a diesel engine  

Science Journals Connector (OSTI)

Abstract A regenerative organic Rankine cycle (RORC) system is designed to recover the exhaust heat of a diesel engine, and the influence of the intermediate pressure (the pressures at which the steam is extracted from the expander) on performance parameters such as net power output, thermal efficiency and mass flow rate of the working fluid are analyzed. The organic working fluids under investigation are \\{R245fa\\} and the zeotropic mixture isopentane/R245fa (in a 0.7/0.3 mol fraction). Based on initial calculations of RORC system performance, the intermediate pressure is set to 1.15 MPa for the RORC system when using isopentane/R245fa (in a 0.7/0.3 mol fraction) as the working fluid, and 1.2 MPa when using \\{R245fa\\} as the working fluid. A performance analysis of the RORC system using the two different working fluids is then conducted over the whole operating range of a diesel engine. The results show that the zeotropic mixture isopentane/R245fa (in a 0.7/0.3 mol fraction) performs better. Finally, a combined diesel engine and RORC system is defined to evaluate the performance improvement of such a combined system over the whole operating range. Results show that, for the combined system, a 10.54% improvement in power output and a 9.55% improvement in fuel economy can be achieved at the engine’s rated condition.

Jian Zhang; Hongguang Zhang; Kai Yang; Fubin Yang; Zhen Wang; Guangyao Zhao; Hao Liu; Enhua Wang; Baofeng Yao

2014-01-01T23:59:59.000Z

122

Simulation of an Industrial Rankine Cycle Cogeneration Plant  

E-Print Network (OSTI)

and transient loads and the resulting interactions between system components may be assessed. A thermal energy system simulation code is utilized and expanded to predict the performance of an industrial Rankine cycle (steam turbine) cogeneration plant having...

Carattie, G.; Wepfer, W. J.

1984-01-01T23:59:59.000Z

123

High-power multi-stage Rankine cycles  

SciTech Connect

This paper presents an analysis of the multi-stage Rankine cycle aiming at optimizing the power output from low-temperature heat sources such as geothermal or waste heat. A design methodology based on finite-time thermodynamics and the maximum power concept is used in which the shape and the power output of the maximum power cycle are identified and utilized to compare and evaluate different Rankine cycle configurations. The maximum power cycle provides the upper-limit power obtained from any thermodynamic cycle for specified boundary conditions and heat exchanger characteristics. It also provides a useful tool for studying power cycles and forms the basis for making design improvements.

Ibrahim, O.M. [Univ. of Rhode Island, Kingston, RI (United States). Mechanical Engineering Dept.; Klein, S.A. [Univ. of Wisconsin, Madison, WI (United States). Mechanical Engineering Dept.

1995-09-01T23:59:59.000Z

124

A technical, economical and market review of organic Rankine cycles for the conversion of low-grade heat for power generation  

Science Journals Connector (OSTI)

This paper presents an overview of the technical and economic aspects, as well as the market evolution of the Organic Rankine Cycle (ORC). This is an unconventional but very promising technology for the conversion of thermal energy, at low and medium temperatures, into electrical and/or mechanical energy on a small scale. As it makes a greater and/or more intensive use of its energy source, this technology could facilitate an electricity supply to unconnected areas, the self-production of energy, the desalination of seawater for human consumption, or even to increase the energy efficiency in the industrial sector respecting the environment. A look at the scientific publications on this topic shows an open research line, namely the selection of a suitable working fluid for these systems, since there is as yet none that provides all aspects that must be taken into account in ORCs. Furthermore, a description and an analysis of the applications of the proposed technology is carried out, specifying the main providers, which at the present time is limited mainly to the range 0.2–2 MWe with a cost of around 1 and 4 × 103 €/kWe. Lower powers are in pre-commercial status.

Fredy Vélez; José J. Segovia; M. Carmen Martín; Gregorio Antolín; Farid Chejne; Ana Quijano

2012-01-01T23:59:59.000Z

125

Development and experimental study on organic Rankine cycle system with single-screw expander for waste heat recovery from exhaust of diesel engine  

Science Journals Connector (OSTI)

Abstract A single-screw expander with 155 mm diameter screw has been developed. A spiral-tube type evaporator and an aluminum multi-channel parallel type condenser have also been developed with weight of 147 kg and 78 kg, respectively. Based on the development of above components, an ORC (organic Rankine cycle) system prototype was assembled and tested for waste heat recovery from diesel engine exhaust. An experimental system was built for this ORC system, and experiments were conducted for different expander torque and diesel engine loads. Influences of expander torque and diesel engine loads on the performances of ORC system were studied. The results indicated that the maximum of the power output is 10.38 kW and the biggest ORC efficiency and overall system efficiency are respectively 6.48% and 43.8%, which are achieved at 250 kW of diesel engine output. Meanwhile the biggest improvement of overall system efficiency is 1.53%. The maximums of volume efficiency, adiabatic efficiency and total efficiency of single-screw expander are 90.73%, 73.25% and 57.88%, respectively.

Ye-Qiang Zhang; Yu-Ting Wu; Guo-Dong Xia; Chong-Fang Ma; Wei-Ning Ji; Shan-Wei Liu; Kai Yang; Fu-Bin Yang

2014-01-01T23:59:59.000Z

126

Integrating solar Organic Rankine Cycle into a coal-fired power plant with amine-based chemical absorption for CO2 capture  

Science Journals Connector (OSTI)

Abstract A novel system integrating solar Organic Rankine Cycle (ORC) into a power plant with amine-based chemical absorption for CO2 capture is proposed. The condensation heat of ORC provides the required heat for solvent regeneration, which avoids the energy penalty caused by the steam extraction traditionally. The cascade utilization of solar energy is realized through a combined supply of power generation and condensation heat. From the aspects of technology and economics, a performance analysis is presented to compare the proposed system and three other systems based on a 300 MWe power plant. The proposed system shows better performance than that of reference systems in the power generation and emission reductions. Economic evaluation was conducted in terms of levelized costs of electricity (LCOE) and cost of CO2 removed (COR). In order to achieve lower LCOE and COR compared to the power plant integrated with solar assisted post-combustion CO2 capture (PCC), the price of ORC has to be lower than 1284.46 USD/kW under the conditions that the price of the solar field is 120 USD/m2. It is believed that the proposed system has a satisfied potential to meet the thermal demand for the solvent regeneration in the power plant with PCC.

Li Zhao; Ruikai Zhao; Shuai Deng; Yuting Tan; Yinan Liu

2014-01-01T23:59:59.000Z

127

Analysis and optimization of cascade Rankine cycle for liquefied natural gas cold energy recovery  

Science Journals Connector (OSTI)

Abstract This study proposes a new concept called the cascade Rankine cycle, which recovers LNG (liquefied natural gas) cold energy for power generation, optimizes the cycle by investigating the effects of key parameters on its performance, and compares its thermal efficiency, exergy efficiency and economic evaluation to those of the conventional alternatives. The cascade Rankine cycle consists of multiple stages of the organic Rankine cycle in a layered structure in which the first stage encompasses the second one that, in turn, encompasses the next. Due to its layered configuration, optimization of the cycle is straightforward and involves sequentially optimizing the individual stages. Optimization of the subsequent stages, however, required process simulation considering the equipment efficiency and the thermodynamic properties of the working fluid. Process simulation indicated that the indicators such as net power output, thermal efficiency, and exergy efficiency generally increase as the number of stages increases. These indicators were, however, significantly affected by the thermodynamic properties of the working fluids. The proposed cycles demonstrated significantly better performance in these indicators than the conventional cycles. The three-stage cascade Rankine cycle with propane as the working fluid exhibited the highest net power output, thermal efficiency and exergy efficiency within the set.

In-Hwan Choi; Sangick Lee; Yutaek Seo; Daejun Chang

2013-01-01T23:59:59.000Z

128

Design and simulation of a prototype of a small-scale solar CHP system based on evacuated flat-plate solar collectors and Organic Rankine Cycle  

Science Journals Connector (OSTI)

Abstract This paper presents a dynamic simulation model of a novel prototype of a 6 kWe solar power plant. The system is based on the coupling of innovative solar thermal collectors with a small Organic Rankine Cycle (ORC), simultaneously producing electric energy and low temperature heat. The novelty of the proposed system lies in the solar collector field, which is based on stationary evacuated flat-plate solar thermal collectors capable to achieve the operating temperatures typical of the concentrating solar thermal collectors. The solar field consists of about 73.5 m2 of flat-plate evacuated solar collectors, heating a diathermic oil up to a maximum temperature of 230 °C. A diathermic oil storage tank is employed in order to mitigate the fluctuations due to the variability of solar energy availability. The hot diathermic oil exiting from the tank passes through an auxiliary gas-fired burner which provides eventual additional thermal energy. The inlet temperature of the diathermic oil entering the ORC system varies as a function of the availability of solar energy, also determining an oscillating response of the ORC. The ORC was simulated in Engineering Equation Solver (EES), using zero-dimensional energy and mass balances. The ORC model was subsequently implemented in a more general TRNSYS model, including all the remaining components of the system. The model was used to evaluate the energy and economic performance of the solar CHP system under analysis, in different climatic conditions. The results show that the efficiency of the ORC does not significantly vary during the year, remaining always close to 10%. On the other hand, the efficiency of the solar collectors is very high in summer (>50%) and significantly lower during the coldest winter days (down to 20%). Pay-back periods are extremely attractive in case of feed-in tariffs (about 5 years), whereas the profitability of the system is scarce when no public funding is available. A sensitivity analysis was also performed, in order to determine the combination of system/design parameters able to maximize the thermo-economic performance of the system. It was found that the system may be economically feasible for the majority of locations in the Mediterranean area (pay-back periods around 10 years), whereas the profitability is unsatisfactory for Central-Europe sites.

Francesco Calise; Massimo Dentice d’Accadia; Maria Vicidomini; Marco Scarpellino

2015-01-01T23:59:59.000Z

129

M. Bahrami ENSC 461 (S 11) Tutorial Rankine Cycle 1 ENSC 461 Tutorial, Week#10 -Rankine Cycle  

E-Print Network (OSTI)

on a simple ideal Rankine cycle with turbine inlet conditions of 5 MPa and 450C and a condenser pressure of 25, it is common to assume that the liquid at location 1 is saturated. Turbine inW 1 Pump 2 Qout Q Condenser Boiler the rate of work output (turbine 3 4), a control volume is constructed that encloses the steam

Bahrami, Majid

130

Preliminary thermodynamic study for an efficient turbo-blower external combustion Rankine cycle  

Science Journals Connector (OSTI)

This research paper presents a preliminary thermodynamic study of an innovative power plant operating under a Rankine cycle fed by an external combustion system with ... a heat exchanger, to a carbon dioxide Rankine

Manuel Romero Gómez; Javier Romero Gómez; Ramón Ferreiro Garcia…

2014-08-01T23:59:59.000Z

131

A hybrid Rankine cycle (HyRC) with ambient pressure combustion (APC)  

Science Journals Connector (OSTI)

Abstract The main losses in thermal power generation include heat in exhaust flue gas, heat rejected through steam condensation of low-pressure turbine, and exergy destruction in heat exchange process etc. To the extent that the heat losses are significantly greater in temperature than either air or water coolant resources, these losses also represent exergy losses which might be exploited to improve plant capacity and efficiency. This paper presents a hybrid Rankine cycle (HyRC) with an ambient pressure combustion (APC) boiler to address the recovery potential of these losses within the steam Rankine cycle (SRC). The APC–HyRC concept employs an organic Rankine cycle (ORC) to supplement SRC and to reduce cycle energy losses to the atmosphere since organic fluids are capable of lowering cycle condensation temperature when a very low temperature heat sink is available. The case studies based on a 399 MW SRC unit show that the APC–HyRC configurations have better thermodynamic performance than its base case SRC at a cycle condensation temperature of 30 °C and below. The best APC–HyRC configuration generates up to 14% more power than the baseline steam cycle which is a 5.45% increase in overall gross efficiency with a cycle condensation temperature at 4 °C.

Lijun Wu; David Thimsen; Bruce Clements; Ligang Zheng; Richard Pomalis

2014-01-01T23:59:59.000Z

132

High-Temperature Components for Rankine-Cycle-Based Waste Heat Recovery Systems on Combustion Engines  

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

This poster reports on recent developments, achievements, and capabilities within a virtual environment to predict the dynamic behavior of the Rankine cycle within real driving cycles.

133

THE TRANSPOSED CRITICAL TEMPERATURE RANKINE THERMODYNAMIC CYCLE  

E-Print Network (OSTI)

of Electricity from Geothermal Energy," Brown University,Simulation of Geothermal Energy Cycles), LBL publication-Manager), Economics "Geothermal Energy Conversion and Case

Pope, William L.

2012-01-01T23:59:59.000Z

134

Potassium Rankine cycle nuclear power systems for spacecraft and lunar-mass surface power  

SciTech Connect

The potassium Rankine cycle has high potential for application to nuclear power systems for spacecraft and surface power on the moon and Mars. A substantial effort on the development of Rankine cycle space power systems was carried out in the 1960`s. That effort is summarized and the status of the technology today is presented. Space power systems coupling Rankine cycle power conversion to both the SP-100 reactor and thermionic reactors as a combined power cycle are described in the paper.

Holcomb, R.S.

1992-07-01T23:59:59.000Z

135

Development of an Autonomous Free Piston Refrigerating Unit Driven by Rankine Cycle  

Science Journals Connector (OSTI)

It has been previously demonstrated that a single free piston machine can act as compressor and pump, for the purpose of achieving two (direct and inverse) Rankine cycle.

Y. Vandendael; D. Vokaer

1983-01-01T23:59:59.000Z

136

[en] THERMODYNAMIC COMPARISON BETWEEN A TRADITIONAL RANKINE CYCLE WITH AN INNOVATIVE RANKINE CYCLE USING RESIDUAL GASES FROM THE SIDERURGIC PROCESS.  

E-Print Network (OSTI)

??[pt] O presente trabalho realiza uma comparação entre o ciclo Rankine tradicional e uma nova proposta de ciclo Rankine para uma planta de cogeração na… (more)

CARLOS THOMAZ GUIMARAES LOPES JUNIOR

2008-01-01T23:59:59.000Z

137

GENERALIZED HEEGNER CYCLES AND p-ADIC RANKIN L-SERIES  

E-Print Network (OSTI)

GENERALIZED HEEGNER CYCLES AND p-ADIC RANKIN L-SERIES MASSIMO BERTOLINI, HENRI DARMON, and KARTIK cycles under the p-adic Abel­Jacobi map to the special values of certain p-adic Rankin L-called generalized Heegner cycles in the product of a Kuga­Sato variety with a power of a CM elliptic curve. Its main

Prasanna, Kartik

138

RANKIN-SELBERG L-FUNCTIONS AND CYCLES ON UNITARY SHIMURA VARIETIES  

E-Print Network (OSTI)

RANKIN-SELBERG L-FUNCTIONS AND CYCLES ON UNITARY SHIMURA VARIETIES BENJAMIN HOWARD Contents 1 #12;RANKIN-SELBERG L-FUNCTIONS AND CYCLES ON UNITARY SHIMURA VARIETIES 3 defined by x (iC()x, i. Introduction 1 2. Unitary Shimura varieties and their special cycles 2 2.1. Unitary Shimura varieties 2 2

Goren, Eyal Z.

139

RANKIN-SELBERG L-FUNCTIONS AND CYCLES ON UNITARY SHIMURA VARIETIES  

E-Print Network (OSTI)

RANKIN-SELBERG L-FUNCTIONS AND CYCLES ON UNITARY SHIMURA VARIETIES BENJAMIN HOWARD Contents 1. Introduction 1 1.1. Acknowledgements 2 2. Unitary Shimura varieties and their special cycles 2 2.1. Unitary.2. Divisors associated with harmonic forms 18 3.3. Construction of Green functions 18 3.4. Rankin-Selberg L

Howard, Ben

140

Organic Rankine power conversion subsystem development for the small community solar thermal power system  

SciTech Connect

The development and preliminary test results for an air-cooled, hermetically sealed 20 kW sub E organic Rankine cycle engine/alternator unit for use with point focussing distributed receiver solar thermal power system. A 750 F toluene is the working fluid and the system features a high speed, single-stage axial flow turbine direct-coupled to a permanent magnet alternator. Good performance was achieved with the unit in preliminary tests.

Barber, R.E.; Boda, F.P.

1982-07-01T23:59:59.000Z

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


141

Combined gas turbine-Rankine turbine power plant  

SciTech Connect

A combined gas turbine-Rankine cycle powerplant with improved part load efficiency is disclosed. The powerplant has a gas turbine with an organic fluid Rankine bottoming cycle which features an inter-cycle regenerator acting between the superheated vapor leaving the Rankine turbine and the compressor inlet air. The regenerator is used selectively as engine power level is reduced below maximum rated power.

Earnest, E.R.

1981-05-19T23:59:59.000Z

142

Investigations of supercritical CO2 Rankine cycles for geothermal power plants  

SciTech Connect

Supercritical CO2 Rankine cycles are investigated for geothermal power plants. The system of equations that describe the thermodynamic cycle is solved using a Newton-Rhapson method. This approach allows a high computational efficiency of the model when thermophysical properties of the working fluid depend strongly on the temperature and pressure. Numerical simulation results are presented for different cycle configurations in order to assess the influences of heat source temperature, waste heat rejection temperatures and internal heat exchanger design on cycle efficiency. The results show that thermodynamic cycle efficiencies above 10% can be attained with the supercritical brayton cycle while lower efficiencies can be attained with the transcritical CO2 Rankine cycle.

Sabau, Adrian S [ORNL; Yin, Hebi [ORNL; Qualls, A L [ORNL; McFarlane, Joanna [ORNL

2011-01-01T23:59:59.000Z

143

The Design of an Open Rankine-Cycle Industrial Heat Pump  

E-Print Network (OSTI)

An open Rankine-cycle heat pump is ideally suited for producing low-pressure industrial process steam. Because steam serves as both the heat pump motive fluid and process fluid, the system achieves a unique simplicity and versatility...

Leibowitz, H. M.; Chaudoir, D. W.

1981-01-01T23:59:59.000Z

144

Advanced Organic Vapor Cycles for Improving Thermal Conversion Efficiency in Renewable Energy Systems  

E-Print Network (OSTI)

Nonconventional Fluids," ASME Jour of Engineering for Power,fluids for Organic Rankine Cycles," Applied Thermal Engineering,fluid in waste heat recovery," Applied Thermal Engineering,

Ho, Tony

2012-01-01T23:59:59.000Z

145

Solar-powered/fuel-assisted Rankine-cycle power and cooling system: Simulation method and seasonal performance  

SciTech Connect

The subject of this analysis is a solar cooling system based on a novel hybrid steam Rankine cycle. Steam is generated by the use of solar energy collected at about 100/sup 0/C, and it is then superheated to about 600/sup 0/C in a fossil-fuel-fired superheater. The addition of about 20-26 percent of fuel doubles the power cycle's efficiencyas compared to organic Rankine cycles operating at similar collector temperatures. A comprehensive computer program was developed to analyze the operation and performance of the entire power/cooling system. Transient simulation was performed on an hourly basis over a cooling season in two representative climatic regions (Washington, D.C. and Phoenix, Ariz.). One of the conclusions is that the seasonal system COP is 0.82 for the design configuration and that the use of watercooled condensers and flat-plate collectors of higher efficiency increases this value to 1.35.

Lior, N.; Koai, K.

1984-05-01T23:59:59.000Z

146

Investigation of thermal stability of fluorinol-85 and 2-methylpyridine/water as Rankine Cycle Power Systems working fluids  

SciTech Connect

Results of the experimental investigation to date, indicate that Fluorinol-85 could be utilized in Organic Rankine Cycle Power Systems (ORCPS) to a maximum cycle temperature of 550/sup 0/F without any discernable decomposition over an extended period of time. However, at 575/sup 0/F, Fluorinol-85 could possibly decompose between 1 and 3% per year depending upon system design considerations. 2-methyl-pyridine/water could have possibly less than a 2% annual decomposition rate at 600/sup 0/F maximum cycle temperature.

Jain, M.L.; Demirgian, J.; Hillis, D.L.

1984-01-01T23:59:59.000Z

147

GENERALISED HEEGNER CYCLES AND p-ADIC RANKIN L-SERIES MASSIMO BERTOLINI, HENRI DARMON & KARTIK PRASANNA1  

E-Print Network (OSTI)

GENERALISED HEEGNER CYCLES AND p-ADIC RANKIN L-SERIES MASSIMO BERTOLINI cycles * * 15 2.1. Kuga-Sato varieties.3. Definition of the cycles * * 19 2.4. Relation

Darmon, Henri

148

Comparison of subcritical and supercritical Rankine cycles for application to the geopressured geothermal resource  

SciTech Connect

There are several features unique to the geopressure geothermal resource which narrow the range of power cycle alternatives. The thermodynamic and operating restrictions which appear to favor the application of a supercritical Rankine power cycle utilizing propane for the recovery of thermal energy from the geopressure geothermal resource are described. This power cycle can be integrated into a natural gas recovery scheme that conserves reservoir pressure for brine disposal and produces gas at pipeline pressure.

Goldsberry, F.L.

1981-10-01T23:59:59.000Z

149

A new Rankine cycle for hydrogen-fired power generation plants and its exergetic efficiency  

Science Journals Connector (OSTI)

A novel power generation cycle is proposed in this paper taking hydrogen as fuel and using steam generated by hydrogen firing as working fluid. The progress of the development work and side issues such as the application of hydrogen combustion turbines to environmentally clean fossil fuel power plants for early commercialisation of the system are reviewed. We propose the hydrogen-fired Rankine cycle as similar to (C) type developed earlier by Hisadome et al. and Sugishita et al. and then making a new design of it by increasing the performance characteristics and efficiencies with (reheating, regenerative and recuperation) of the working fluid of the bottoming cycle respectively, and in this case we present two types (C1 and C2). In the case of type C2 the cycle is called the ''New Rankine Cycle''. These cycles are also compared with the Rankine cycle of type (C) for hydrogen-fired to show the advantages of the performance characteristics of the new design at which the highest value of exergetic efficiency reaches 63.58% as HHV at 1700°C of the combustor discharge temperature. These cycles are analysed through thermodynamics, particularly by exergy analysis, and the performance characteristics of the cycles are also studied.

Mohammed Ghiyath Soufi; Terushige Fujii; Katsumi Sugimoto; Hitoshi Asano

2004-01-01T23:59:59.000Z

150

Method of optimizing performance of Rankine cycle power plants. [US DOE Patent  

DOE Patents (OSTI)

A method is described for efficiently operating a Rankine cycle power plant to maximize fuel utilization efficiency or energy conversion efficiency or minimize costs by selecting a turbine fluid inlet state which is substantially on the area adjacent and including the transposed critical temperature line.

Pope, W.L.; Pines, H.S.; Doyle, P.A.; Silvester, L.F.

1980-06-23T23:59:59.000Z

151

Supercritical Rankine Cycle Coupled with Ground Cooling for Low Temperature Power Generation  

Science Journals Connector (OSTI)

Abstract This paper presents an application of an earth-air-heat-exchanger (EAHE) as condenser in low to medium temperature power generation plants. A supercritical Rankine cycle (SRC) utilizing organic refrigerants as working fluids was used as the power cycle for the plant. The heat source temperature was varied from 125-1750C. The condenser was coupled to an EAHE system buried at a depth of 2 m under the surface of the earth. Its effect on the power cycle efficiency over a period of six months has been studied. It was observed that the soil temperature 10 cm from the surface (horizontal direction) of the underground pipe increased by almost 20C during this time. This temperature change decreased with distance from the pipe. The soil temperature profile varied with time, distance from the pipe and location along the length of the pipe. The efficiency of the SRC increased by 1% and the daily fluctuations were reduced when EAHE was used.

Rachana Vidhi; D. Yogi Goswami; Elias Stefanakos

2014-01-01T23:59:59.000Z

152

Method for recovering power according to a cascaded rankine cycle by gasifying liquefied natural gas and utilizing the cold potential  

SciTech Connect

The present invention discloses a method for recovering effective energy as power between liquefied natural gas and a high temperature source by cascading two kinds of Rankine cycles when the liquefied natural gas is re-gasified. The method is characterized in that a first medium performs a first Rankine cycle with the liquefied natural gas as a low temperature source, the first medium being mainly a mixture of hydrocarbons having 1-6 carbon atoms or a mixture of halogenated hydrocarbons of boiling points close to those of said hydrocarbons, the first medium having compositions according to which the vapor curve of gasifying the liquefied natural gas substantially corresponds to the low pressure cooling curve of the first medium, the power generated thereby is recovered by a first turbine during the first Rankine cycle, a second medium having a higher boiling point than said first medium performs a second Rankine cycle with part of said first Rankine cycle as the low temperature source, the second medium, being a single hydrocarbon component having 1-6 carbon atoms or a mixture thereof, a single halogenated hydrocarbon whose boiling point is close to that of this hydrocarbon or a mixture thereof, or ammonia, whose low pressure cooling curve substantially corresponds to the vapor curve of the high pressure first medium, said first and second Rankine cycles are cascaded, and a second turbine is disposed to recover power during the second Rankine cycle.

Matsumoto, O.; Aoki, I.

1984-04-24T23:59:59.000Z

153

Advanced fusion MHD power conversion using the CFAR (compact fusion advanced Rankine) cycle concept  

SciTech Connect

The CFAR (compact fusion advanced Rankine) cycle concept for a tokamak reactor involves the use of a high-temperature Rankine cycle in combination with microwave superheaters and nonequilibrium MHD disk generators to obtain a compact, low-capital-cost power conversion system which fits almost entirely within the reactor vault. The significant savings in the balance-of-plant costs are expected to result in much lower costs of electricity than previous concepts. This paper describes the unique features of the CFAR cycle and a high- temperature blanket designed to take advantage of it as well as the predicted performance of the MHD disk generators using mercury seeded with cesium. 40 refs., 8 figs., 3 tabs.

Hoffman, M.A.; Campbell, R.; Logan, B.G. (California Univ., Davis, CA (USA); Lawrence Livermore National Lab., CA (USA))

1988-10-01T23:59:59.000Z

154

Investigation of the effect of organic working fluids on thermodynamic performance of combined cycle Stirling-ORC  

Science Journals Connector (OSTI)

This paper presents thermodynamic investigation and environmental consideration of combined Stirling-organic Rankine cycle (ORC) power cycle. Combined cycle can be assisted by solar energy and ... side heat rejec...

Mohammad Bahrami; Ali A Hamidi…

2013-02-01T23:59:59.000Z

155

Étude de la faisabilité des cycles sous-critiques et supercritiques de Rankine pour la valorisation de rejets thermiques.  

E-Print Network (OSTI)

??Ce travail de thèse concerne l’étude de la faisabilité des cycles organiques sous-critiques et supercritiques de Rankine pour la valorisation de rejets thermiques industriels à… (more)

Le, Van Long

2014-01-01T23:59:59.000Z

156

Reduced gravity Rankine cycle system design and optimization study with passive vortex phase separation  

E-Print Network (OSTI)

REDUCED GRAVITY RANKINE CYCLE SYSTEM DESIGN AND OPTIMIZATION STUDY WITH PASSIVE VORTEX PHASE SEPARATION A Thesis by KEVIN ROBERT SUPAK Submitted to the Office of Graduate Studies of Texas A&M University... SEPARATION A Thesis by KEVIN ROBERT SUPAK Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Approved by: Chair of Committee, Frederick...

Supak, Kevin Robert

2008-10-10T23:59:59.000Z

157

GENERALISED HEEGNER CYCLES AND p-ADIC RANKIN L-SERIES MASSIMO BERTOLINI, HENRI DARMON & KARTIK PRASANNA1  

E-Print Network (OSTI)

GENERALISED HEEGNER CYCLES AND p-ADIC RANKIN L-SERIES MASSIMO BERTOLINI, HENRI DARMON & KARTIK multiplication 12 1.5. Values of modular forms at CM points 14 2. Generalised Heegner cycles 15 2.1. Kuga-Sato varieties 15 2.2. The variety Xr and its cohomology 18 2.3. Definition of the cycles 19 2.4. Relation

Darmon, Henri

158

Nexant Parabolic Trough Solar Power Plant Systems Analysis; Task 2: Comparison of Wet and Dry Rankine Cycle Heat Rejection, 20 January 2005 - 31 December 2005  

SciTech Connect

Subcontract report by Nexant, Inc., regarding a system analysis comparing solar parabolic trough plants with wet and dry rankine cycle heat rejection.

Kelly, B.

2006-07-01T23:59:59.000Z

159

Experimental Rankine cycle engine designed for utilization of low temperature, low pressure heat. Final report  

SciTech Connect

The development of a Rankine cycle engine using Freon 11 as working fluid, for the utilization of low temperature heat sources is described together with the results obtained. The experimental investigations showed that the engine performance is in good agreement with the calculated values; that the mechanical behavior of some components is not yet satisfactory; and that the working fluid (Freon 11) is not completely reliable in the higher temperatures range. An extension of the feasibility study dealing mainly with engine behavior and fluid suitability is envisaged, using either Freon 113 or a fluorine compound of the composition CmF(2m+2).

Cipolla, G.; Margary, R.

1981-01-01T23:59:59.000Z

160

Status of Rankine-cycle technology for space nuclear power applications  

SciTech Connect

A substantial effort on the development of the liquid metal Rankine cycle space nuclear power system was carried out in programs jointly sponsored by the National Aeronautics and Space Administration (NASA) and the Atomic Energy Commission (AEC) during the period of 1960--1972. Component tests were conducted which have established a considerable technology base for the concept. The development effort and technology status of each component are presented. The key technology issues remaining for development of the system are: refractory metal parts fabrication, turbine blade endurance, turbine bearings and seals, and generator winding seal. 5 refs.

Holcomb, R.S.

1991-01-01T23:59:59.000Z

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


161

Performance of a 5 kWe Solar-only Organic Rankine Unit Coupled to a Reverse Osmosis Plant  

Science Journals Connector (OSTI)

Abstract Organic Rankine Cycle (ORC) systems are one of the most promising energy conversion technologies available for remote areas and low temperature energy sources. An ORC system works like a conventional Rankine cycle but it uses an organic compound as working fluid, instead of water. A small ORC unit coupled with a solar thermal energy system could be used to convert solar thermal energy into electricity in remote areas, offering an alternative to Photovoltaic (PV) systems to provide the energy required by desalination applications like reverse osmosis (RO). In this work an analysis of the performance of a specific solar desalination ORC system at part load operation is presented, in order to understand its behavior from a thermodynamic perspective and be able to predict the total water production with changing operation conditions. The results showed that water production is around 1.2 m3/h, and it is stable during day and night thanks to the thermal storage and only under bad irradiance circumstances the production would stop.

M. Ibarra; A. Rovira; D.C. Alarcón-Padilla; G. Zaragoza; J. Blanco

2014-01-01T23:59:59.000Z

162

Rankine cycle condenser pressure control using an energy conversion device bypass valve  

DOE Patents (OSTI)

The disclosure provides a waste heat recovery system and method in which pressure in a Rankine cycle (RC) system of the WHR system is regulated by diverting working fluid from entering an inlet of an energy conversion device of the RC system. In the system, an inlet of a controllable bypass valve is fluidly coupled to a working fluid path upstream of an energy conversion device of the RC system, and an outlet of the bypass valve is fluidly coupled to the working fluid path upstream of the condenser of the RC system such that working fluid passing through the bypass valve bypasses the energy conversion device and increases the pressure in a condenser. A controller determines the temperature and pressure of the working fluid and controls the bypass valve to regulate pressure in the condenser.

Ernst, Timothy C; Nelson, Christopher R; Zigan, James A

2014-04-01T23:59:59.000Z

163

Alkali metal Rankine cycle boiler technology challenges and some potential solutions for space nuclear power and propulsion applications  

SciTech Connect

Alkali metal boilers are of interest for application to future space Rankine cycle power conversion systems. Significant progress on such boilers was accomplished in the 1960's and early 1970's, but development was not continued to operational systems since NASA's plans for future space missions were drastically curtailed in the early 1970's. In particular, piloted Mars missions were indefinitely deferred. With the announcement of the Space Exploration Initiative (SEI) in July 1989 by President Bush, interest was rekindled in challenging space missions and, consequently in space nuclear power and propulsion. Nuclear electric propulsion (NEP) and nuclear thermal propulsion (NTP) were proposed for interplanetary space vehicles, particularly for Mars missions. The potassium Rankine power conversion cycle became of interest to provide electric power for NEP vehicles and for 'dual-mode' NTP vehicles, where the same reactor could be used directly for propulsion and (with an additional coolant loop) for power. Although the boiler is not a major contributor to system mass, it is of critical importance because of its interaction with the rest of the power conversion system; it can cause problems for other components such as excess liquid droplets entering the turbine, thereby reducing its life, or more critically, it can drive instabilities-some severe enough to cause system failure. Funding for the SEI and its associated technology program from 1990 to 1993 was not sufficient to support significant new work on Rankine cycle boilers for space applications. In Fiscal Year 1994, funding for these challenging missions and technologies has again been curtailed, and planning for the future is very uncertain. The purpose of this paper is to review the technologies developed in the 1960's and 1970's in the light of the recent SEI applications. In this way, future Rankine cycle boiler programs may be conducted most efficiently.

Stone, J.R.

1994-07-01T23:59:59.000Z

164

Exhaust Heat Driven Rankine Cycle for a Heavy Duty Diesel Engine...  

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

progress to date and plans to develop a viable Rankine engine to harness useful brake power from wasted heat energy in heavy duty truck engine exhaust deer11singh.pdf More...

165

Modeling and Performance Prediction of a Solar Powered Rankin Cycle/Gas Turbine Cycle  

Science Journals Connector (OSTI)

The present study is dealing with the development and implementation of an integrated solar combined cycle power plant in which heat ... its energy from the waste heat of a gas turbine unit in additional to solar

Mohammed A. Elhaj; Kassim K. Matrawy…

2007-01-01T23:59:59.000Z

166

Waste heat recovery from the exhaust of a diesel generator using Rankine Cycle  

Science Journals Connector (OSTI)

Abstract Exhaust heat from diesel engines can be an important heat source to provide additional power using a separate Rankine Cycle (RC). In this research, experiments were conducted to measure the available exhaust heat from a 40 kW diesel generator using two ‘off-the-shelf’ heat exchangers. The effectiveness of the heat exchangers using water as the working fluid was found to be 0.44 which seems to be lower than a standard one. This lower performance of the existing heat exchangers indicates the necessity of optimization of the design of the heat exchangers for this particular application. With the available experimental data, computer simulations were carried out to optimize the design of the heat exchangers. Two heat exchangers were used to generate super-heated steam to expand in the turbine using two orientations: series and parallel. The optimized heat exchangers were then used to estimate additional power considering actual turbine isentropic efficiency. The proposed heat exchanger was able to produce 11% additional power using water as the working fluid at a pressure of 15 bar at rated engine load. This additional power resulted into 12% improvement in brake-specific fuel consumption (bsfc). The effects of the working fluid pressure were also investigated to maximize the additional power production. The pressure was limited to 15 bar which was constrained by the exhaust gas temperature. However, higher pressure is possible for higher exhaust gas temperatures from higher capacity engines. This would yield more additional power with further improvements in bsfc. At 40% part load, the additional power developed was 3.4% which resulted in 3.3% reduction in bsfc.

Shekh Nisar Hossain; Saiful Bari

2013-01-01T23:59:59.000Z

167

Dynamic modeling of steam power cycles: Part II – Simulation of a small simple Rankine cycle system  

Science Journals Connector (OSTI)

This paper presents the second part of the work concerning the dynamic simulation of small steam cycle plants for power generation. The work is part of the preliminary study for a 600 kWe biomass fired steam power plant for which the complete open-loop, lumped parameter dynamic model of the steam cycle has been developed using the SimECS software described in Part I of this work. For these low-power plants, a dynamic simulation tool is especially useful because these systems must be designed to operate in transient mode for most of the time. The plant model presented here consists of the following components: feedwater pump, economizer, evaporator, superheater, impulse turbine, electrical generator and condenser. The primary heat source is modeled as a flue gas flow and no combustion models are incorporated yet to model the furnace. A description of the various components forming the complete steam cycle is given to illustrate the capabilities and modularity of the developed modeling technique. The model is first validated quantitatively against steady-state values obtained using a well known, reliable steady-state process modeling software. Subsequently, the dynamic validation is presented. Results can only be discussed based on the qualitative assessment of the observed trends because measurements are not available, being the plant in the preliminary design phase. The qualitative validation is based on four dynamic simulations involving three small step disturbances of different magnitude imposed on the pump rotational speed and on the flue gas mass flow and a single large ramp disturbance on the flue gas mass flow.

H. van Putten; P. Colonna

2007-01-01T23:59:59.000Z

168

APPLICATION OF TURBOMACHINERY IN SOLAR-ASSISTED RANKINE COOLING SYSTEMS  

E-Print Network (OSTI)

machinery. and the solar-assisted approach at these higherevaluation of the solar-assisted Rankine cycle could beTURBOMACHINER Y IN SOLAR - ASSISTED RANKINE COOLING SYSTEMS

Leech, J.

2010-01-01T23:59:59.000Z

169

Organic Rankine Cycle Turbine for Exhaust Energy Recovery in...  

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

Increase Efficiency in Gasoline Powertrains Environmental Effects of Hydrokinetic Turbines on Fish: Desktop and Laboratory Flume Studies Achieving High Efficiency at 2010 Emissions...

170

Implementation of an organic rankine cycle in a biorefinery concept:.  

E-Print Network (OSTI)

??A bio-refinery concept was defined with the Aspen software. This bio-refinery concept turns water hyacinth into furfural and syngas. Biomass undergoes a hydrolysis at 180ºC… (more)

Chognot, E.

2013-01-01T23:59:59.000Z

171

Impulse Turbine Efficiency Calculation Methods with Organic Rankine Cycle.  

E-Print Network (OSTI)

?? A turbine was investigated by various methods of calculating its efficiency. The project was based on an existing impulse turbine, a one-stage turbine set… (more)

Dahlqvist, Johan

2012-01-01T23:59:59.000Z

172

Working Fluids for Organic Rankine Cycles Comparative Studies  

Science Journals Connector (OSTI)

The paper presents a comparison between working fluids selection using energy and exergy analysis to recover waste heat from Diesel engine (DE). This study involves the use of a 40 kW Diesel engine with basic con...

Mahdi Hatf Kadhum Aboaltabooq; Horatiu Pop…

2014-01-01T23:59:59.000Z

173

Evaluation of hybrid solar/fossil Rankine-cooling concept  

SciTech Connect

The hybrid solar/fossil Rankine cycle is analyzed thermodynamically to determine fuel use and efficiency. The hybrid system is briefly compared with solar organic Rankine systems with a fossil fuel auxiliary mode, and with geothermal resources. The economic evaluation compares the present value of the superheater fuel cost over the system lifetime with the first cost reduction obtained by substituting a hybrid solar/fossil Rankine engine for an organic Rankine engine. The economics analysis indicates that even if the hybrid solar/fossil Rankine cooling system were developed to the point of being a commercial product with an economic advantage over an otherwise equivalent solar organic Rankine cooling system, it would gradually lose that advantage with rising fuel costs and decreasing collector costs. From the standpoint of national fossil fuel conservation, the hybrid concept would be preferable only in applications where the operating duration in the solar/fossil mode would be substantially greater than in the fossil fuel-only auxiliary mode. (LEW)

Curran, H M

1980-11-01T23:59:59.000Z

174

Supervision and control prototyping for an engine exhaust gas heat recovery system based on a steam Rankine cycle  

E-Print Network (OSTI)

Supervision and control prototyping for an engine exhaust gas heat recovery system based on a steam Rankine steam process for exhaust gas heat recovery from a spark-ignition (SI) engine, from a prototyping of a practical supervi- sion and control system for a pilot Rankine steam process for exhaust gas heat recovery

Paris-Sud XI, Université de

175

Improving the efficiency and availability analysis of a modified reheat regenerative Rankine cycle  

SciTech Connect

Reheating in a reheat regenerative steam power cycle increases efficiency by increasing the average temperature of heat reception, but also increases the irreversibility of feed water heaters by raising the temperature of the superheated steam used for the regenerative process. This paper introduces some modifications to the regular reheat regenerative steam power cycle that reduce the irreversibility of the regenerative process. An availability analysis of the modified cycle and the regular reheat regenerative cycle as well as a comparison study between both cycles is done. The results indicate that a gain in energy efficiency of up to 2.5% as the steam generator pressure varies is obtained when applying such modifications at the same conditions of pressure, temperature's number of reheating stages, and feed water heaters. The availability analysis showed that such increase in efficiency is due to the reduction of the irreversibility of the regeneration process of the modified cycle.

Bassily, A.M.

1999-07-01T23:59:59.000Z

176

A novel thermally biased mechanical energy conversion cycle Ian M. McKinley, Sam Goljahi, Christopher S. Lynch, and Laurent Pilona)  

E-Print Network (OSTI)

organic Rankine cycles,3 and thermoelectric devices.4,5 Stirling engines and organic Rankine cyclesA novel thermally biased mechanical energy conversion cycle Ian M. McKinley, Sam Goljahi) This paper demonstrates a new power cycle for direct conversion of mechanical energy into electrical energy

Pilon, Laurent

177

Waste Heat-to-Power Using Scroll Expander for Organic Rankine...  

Office of Environmental Management (EM)

Cycle Bottoming Cycle DE DE - - EE0005767 EE0005767 Green Mountain Coffee (field test site) Green Mountain Coffee (field test site) July 1, 2013 July 1, 2013 - - June 30,...

178

Multi-Megawatt Organic Rankine Engine power plant (MORE). Phase IA final report: system design of MORE power plant for industrial energy conservation emphasizing the cement industry  

SciTech Connect

The Multi-Megawatt Organic Rankine Engine (MORE) program is directed towards the development of a large, organic Rankine power plant for energy conservation from moderate temperature industrial heat streams. Organic Rankine power plants are ideally suited for use with heat sources in the temperature range below 1100/sup 0/F. Cement manufacture was selected as the prototype industry for the MORE system because of the range of parameters which can be tested in a cement application. This includes process exit temperatures of 650/sup 0/F to 1110/sup 0/F for suspension preheater and long dry kilns, severe dust loading, multi-megawatt power generation potential, and boiler exhaust gas acid dew point variations. The work performed during the Phase IA System Design contract period is described. The System Design task defines the complete MORE system and its installation to the level necessary to obtain detailed performance maps, equipment specifications, planning of supporting experiments, and credible construction and hardware cost estimates. The MORE power plant design is based upon installation in the Black Mountain Quarry Cement Plant near Victorville, California.

Bair, E.K.; Breindel, B.; Collamore, F.N.; Hodgson, J.N.; Olson, G.K.

1980-01-31T23:59:59.000Z

179

Modeling and Experimental Validation of a Rankine Cycle Based Exhaust WHR System for Heavy Duty Applications; Modellering och experimentell validering av ett Rankinecykelbaserat Waste Heat Recovery-system.  

E-Print Network (OSTI)

?? To increase the efficiency of the engine is one of the biggest challenges for heavy vehicles. One possible method is the Rankine based Waste… (more)

Carlsson, Carin

2012-01-01T23:59:59.000Z

180

Development and evaluation of a biomass-fired micro-scale CHP with organic rankine cycle.  

E-Print Network (OSTI)

??Combined Heat and Power Generation (CHP) or cogeneration has been considered worldwide as the major alternative to traditional energy systems in terms of signi ticant… (more)

Shao, Yingjuan

2011-01-01T23:59:59.000Z

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


181

Organic Rankine Cycle Turbine for Exhaust Energy Recovery in a Heavy Truck Engine  

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

Presentation given at the 16th Directions in Engine-Efficiency and Emissions Research (DEER) Conference in Detroit, MI, September 27-30, 2010.

182

Organic Rankine Cycle Systems for Waste Heat Recovery in Refineries and Chemical Process Plants  

E-Print Network (OSTI)

. A product package and recommended division of responsibilities between purchaser, A&E company and supplier is presented for installations in refineries and process plants. The product package covers the electrical power range from 3/4 to 5 MW...

Meacher, J. S.

1981-01-01T23:59:59.000Z

183

Optimal Organic Rankine Cycle Installation Planning for Factory Waste Heat Recovery  

Science Journals Connector (OSTI)

As Taiwan’s industry developed rapidly, the energy demand also rises simultaneously. In the production process, there’s a lot of energy consumed in the process. Formally, the energy used in generating the heat in...

Yu-Lin Chen; Chun-Wei Lin

2013-01-01T23:59:59.000Z

184

A novel 2kWe biomass-organic rankine cycle micro cogeneration system.  

E-Print Network (OSTI)

??Energy is potentially at the hub of modern civilization and right from Industrial Revolution, technology has refined and redefined the way we use energy; but… (more)

Daminabo, Ferdinand Frank Oko

2009-01-01T23:59:59.000Z

185

Optimisation of a Multi-Vane Expander as the Prime Mover in an Organic Rankine Cycle  

Science Journals Connector (OSTI)

This paper describes the research and development activities conducted by the Low-Grade Energy Group at Cranfield Institute of Technology in conjunction with Denco Air Ltd., Hereford, regarding the performance of...

P. W. O’Callaghan; Mohey Hussein…

1983-01-01T23:59:59.000Z

186

Thermodynamic and heat transfer analysis of heat recovery from engine test cell by Organic Rankine Cycle  

Science Journals Connector (OSTI)

During manufacture of engines, evaluation of engine performance is essential. This is accomplished in test cells. During the test, a significant portion of heat energy released by the fuel is wasted. In this stud...

Naser Shokati; Farzad Mohammadkhani; Navid Farrokhi…

2014-12-01T23:59:59.000Z

187

Performance of an Organic Rankine Cycle Waste Heat Recovery System for Light Duty Diesel Engines  

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

Poster presented at the 16th Directions in Engine-Efficiency and Emissions Research (DEER) Conference in Detroit, MI, September 27-30, 2010.

188

Author's personal copy Pyroelectric energy converter using co-polymer P(VDF-TrFE) and Olsen cycle  

E-Print Network (OSTI)

into electricity by means of an electrical generator or dynamo. Alternatively, organic Rankine cycles use organicAuthor's personal copy Pyroelectric energy converter using co-polymer P(VDF-TrFE) and Olsen cycle heat harvesting Ferroelectric Olsen cycle a b s t r a c t This study was concerned with designing

Pilon, Laurent

189

Recycling of wasted energy : thermal to electrical energy conversion  

E-Print Network (OSTI)

as Organic Rankine Cycle (ORC) mahines, Sterling engines,Organic Rankine Cycle (ORC) system or Sterling Engine (SE)an organic Rankine cycle (ORC) system generates electricity

Lim, Hyuck

2011-01-01T23:59:59.000Z

190

Micro/Nano-Scale Phase Change Systems for Thermal Management and Solar Energy Conversion Applications  

E-Print Network (OSTI)

into Power Using Organic Rankine Cycles – A Review ofCriteria for an Organic Rankine Cycle Using Low-Temperatureconverted to work in organic Rankine cycle power plants. [

Coso, Dusan

2013-01-01T23:59:59.000Z

191

Modeling, Estimation, and Control of Waste Heat Recovery Systems  

E-Print Network (OSTI)

for Open Organic Rankine Cycle (ORC)138 Evaporatorand Simulation of an Organic Rankine Cycle (ORC) System forControl of Organic Rankine Cycles in Waste Heat Uti- lizing

Luong, David

2013-01-01T23:59:59.000Z

192

Recycling of wasted energy : thermal to electrical energy conversion  

E-Print Network (OSTI)

Organic Rankine Cycle achieved by using Organic Rankine Cycle or Sterling Engines.technologies such as Organic Rankine Cycle (ORC) mahines,

Lim, Hyuck

2011-01-01T23:59:59.000Z

193

Clean Energy Technologies: A Preliminary Inventory of the Potential for Electricity Generation  

E-Print Network (OSTI)

Organic Rankine Cycle.Heat Using High-Speed Organic Rankine Cycle (ORC), Int. J.Power recovery Organic Rankine Cycle Flare Gas Recovery

Bailey, Owen; Worrell, Ernst

2005-01-01T23:59:59.000Z

194

Emerging Energy-efficiency and Carbon Dioxide Emissions-reduction Technologies for the Iron and Steel Industry  

E-Print Network (OSTI)

heat recovery, an organic rankine cycle turbine can be usedfor power generation. Organic rankine cycle generators arefiring) ? With an organic rankine cycle turbine, 7.5-percent

Hasanbeigi, Ali

2014-01-01T23:59:59.000Z

195

Comparative evaluation of three alternative power cycles for waste heat recovery from the exhaust of adiabatic diesel engines  

SciTech Connect

Three alternative power cycles were compared in application as an exhaust-gas heat-recovery system for use with advanced ''adiabatic'' diesel engines. The power cycle alternatives considered were steam Rankine, organic Rankine with RC-1 as the working fluid, and variations of an air Brayton cycle. The comparison was made in terms of fuel economy and economic payback potential for heavy-duty trucks operating in line-haul service. The results indicate that, in terms of engine rated specific fuel consumption, a diesel/alternative-power-cycle engine offers a significant improvement over the turbocompound diesel used as the baseline for comparison. The maximum improvement resulted from the use of a Rankine cycle heat-recovery system in series with turbocompounding. The air Brayton cycle alternatives studied, which included both simple-cycle and compression-intercooled configurations, were less effective and provided about half the fuel consumption improvement of the Rankine cycle alternatives under the same conditions. Capital and maintenance cost estimates were also developed for each of the heat-recovery power cycle systems. These costs were integrated with the fuel savings to identify the time required for net annual savings to pay back the initial capital investment. The sensitivity of capital payback time to arbitrary increases in fuel price, not accompanied by corresponding hardware cost inflation, was also examined. The results indicate that a fuel price increase is required for the alternative power cycles to pay back capital within an acceptable time period.

Bailey, M.M.

1985-07-01T23:59:59.000Z

196

Modeling, Estimation, and Control of Waste Heat Recovery Systems  

E-Print Network (OSTI)

141 Open ORC Systemfor Open Organic Rankine Cycle (ORC)138 Evaporatorof an Organic Rankine Cycle (ORC) System for Waste Heat

Luong, David

2013-01-01T23:59:59.000Z

197

Experimental and Analytical Studies on Pyroelectric Waste Heat Energy Conversion  

E-Print Network (OSTI)

ect of working ?uids on organic Rankine cycle for waste heatof such devices. Organic Rankine cycles and Stirling engines

Lee, Felix

2012-01-01T23:59:59.000Z

198

A Continuous Solar Thermochemical Hydrogen Production Plant Design  

E-Print Network (OSTI)

W. , “Optimizing an Organic Rankine Cycle,” CEP, v.35, 2012,used in industrial organic Rankine cycles, and is already

Luc, Wesley Wai

199

Advanced Organic Vapor Cycles for Improving Thermal Conversion Efficiency in Renewable Energy Systems.  

E-Print Network (OSTI)

??The Organic Flash Cycle (OFC) is proposed as a vapor power cycle that could potentially increase power generation and improve the utilization efficiency of renewable… (more)

Ho, Tony

2012-01-01T23:59:59.000Z

200

Thermo-fluid dynamics preliminary design of turbo-expanders for ORC cycles  

Science Journals Connector (OSTI)

Selecting the best design options for turbo-expanders to be used in Organic Rankine Power Cycle applications is a difficult task, with special reference to the low-temperature applications (T turbo-expander efficiency. Referring to a radial-type turbo-expander, a comparison of different working fluids is presented and discussed.

Daniele Fiaschi; Giampaolo Manfrida; Francesco Maraschiello

2012-01-01T23:59:59.000Z

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


201

Rankine-Brayton engine powered solar thermal aircraft  

DOE Patents (OSTI)

A solar thermal powered aircraft powered by heat energy from the sun. A Rankine-Brayton hybrid cycle heat engine is carried by the aircraft body for producing power for a propulsion mechanism, such as a propeller or other mechanism for enabling sustained free flight. The Rankine-Brayton engine has a thermal battery, preferably containing a lithium-hydride and lithium mixture, operably connected to it so that heat is supplied from the thermal battery to a working fluid. A solar concentrator, such as reflective parabolic trough, is movably connected to an optically transparent section of the aircraft body for receiving and concentrating solar energy from within the aircraft. Concentrated solar energy is collected by a heat collection and transport conduit, and heat transported to the thermal battery. A solar tracker includes a heliostat for determining optimal alignment with the sun, and a drive motor actuating the solar concentrator into optimal alignment with the sun based on a determination by the heliostat.

Bennett, Charles L. (Livermore, CA)

2009-12-29T23:59:59.000Z

202

Evaluation of Brayton and Rankine alternatives for diesel waste heat exploitation  

SciTech Connect

A diesel engine may produce exhaust-gas thermal energy in excess of that needed for turbocharging. Alternatives for exploitation of the energy by producing work may be direct expansion through a gas turbine (completing a Brayton cycle that begins with the engine's compression and combustion), or transfer of heat into a Rankine cycle. It is demonstrated that either alternative may have a domain in which it is superior in work done, or in exhaust volume per unit mass of diesel exhaust. Computation models are developed and demonstrated for finding the boundaries along which the Rankine and Brayton alternatives have equal merit in either work or exhaust volume.

Woodward, J.B. (Univ. of Michigan, Ann Arbor, MI (United States). Naval Architecture and Marine Engineering)

1994-01-01T23:59:59.000Z

203

Enhancement of combined cycle performance using transpiration cooling of gas turbine blades with steam  

Science Journals Connector (OSTI)

Gas/steam combined cycle is synergetic combination of Brayton cycle based topping cycle and Rankine cycle based bottoming cycle, which have capability of operating independently too. Combined cycle performance de...

Sanjay Kumar; Onkar Singh

2014-06-01T23:59:59.000Z

204

Potassium-Rankine power conversion subsystem modeling for nuclear electric propulsion  

SciTech Connect

A potassium-Rankine power conversion system model was developed under Contract No. NAS3-25808 for the NASA-LeRC. This model predicts potassium-Rankine performance for turbine inlet temperatures (TIT) from 1200 - 1600 K, TIT to condenser temperature ratios from 1.25-1.6, power levels from 100 to 10,000 kWe, and lifetimes from 2-10 years. The model is for a Rankine cycle with reheat for turbine stage moisture control. The model assumes heat is supplied from a lithium heat transport loop. The model does not include a heat source or a condenser/heat rejection system model. These must be supplied by the user.

Johnson, G.A.

1993-09-01T23:59:59.000Z

205

Use of combined steam-water and organic rankine cycles for achieving better efficiency of gas turbine units and internal combustion engines  

Science Journals Connector (OSTI)

Innovative concepts of recovering waste heat using low-boiling working fluids, due to which the the efficiency can be increased to 28–30%, are presented. If distributed generation of electricity or combined pr...

M. A. Gotovskiy; M. I. Grinman; V. I. Fomin; V. K. Aref’ev…

2012-03-01T23:59:59.000Z

206

Fabrication and life cycle assessment of organic photovoltaics.  

E-Print Network (OSTI)

??Increasing demand for renewable energy has resulted in a new interest for alternative technologies such as organic photovoltaics. With efficiencies exceeding 8% for both polymer… (more)

Anctil, Annick

2011-01-01T23:59:59.000Z

207

Code Snippets Justin A. Roman, Tanisha Rankin,  

E-Print Network (OSTI)

Code Snippets Justin A. Roman, Tanisha Rankin, Grae Cullen, and Paul Wolfgang Fall Semester 2008 coding techniques. Professors will be allowed to assign pre-defined problems which will be listed will save, compile, run, and check the method. Pre-defined test cases will determine the validity

Wolfgang, Paul

208

Kalina combined cycle performance and operability  

SciTech Connect

Gas turbine combined cycles using Rankine bottoming cycles have gained broad market acceptance. The favorable plant economics derive from their high efficiency, short construction cycles and excellent environmental performance. The responsive operating characteristics of combined cycles is another key advantage for customers. Duty cycles cover the spectrum from daily start stop (DSS) to base load. Performance and economics of combined cycles have progressed with advances in gas turbine technology as well as the introduction of increasingly efficient multi-pressure Rankine bottoming cycles. Further advances in gas turbine technology and Rankine bottoming cycle performance are becoming incrementally more difficult and costly to achieve. The availability of the Kalina cycle presents a clear path toward improved combined-cycle system performance and reduced cost of electricity. This paper presents detailed performance and operating characteristics of a STAG 207FA combined cycle employing the Kalina bottoming cycle. These characteristics are compared to a conventional three-pressure reheat Rankine bottoming cycle. The Kalina cycle is shown to have performance and operability advantages throughout the range of site conditions and operating regimes, such as base load, load following, DSS duty, wet and dry cooling tower applications and unattended operation. These advantages derive from a single-pressure once-through heat recovery system, above atmospheric working fluid pressure throughout the system, above atmospheric working fluid pressure throughout the system, very high thermal efficiency ({approximately}2.0 to 2.5 percentage points better than the best Rankine), and compatibility with sub-freezing ambient conditions.

Smith, R.W.; Ranasinghe, J.; Stats, D.; Dykas, S.

1996-12-31T23:59:59.000Z

209

Modeling, Estimation, and Control of Waste Heat Recovery Systems  

E-Print Network (OSTI)

organic Rankine cycle waste heat power conversion system. ”Cycle (ORC) System for Waste Heat Recovery. ” Journal ofRankine Cycles in Waste Heat Uti- lizing Processes. ”

Luong, David

2013-01-01T23:59:59.000Z

210

An introduction to the Kalina cycle  

SciTech Connect

This paper is intended as a primer on the Kalina cycle--a novel, efficient power cycle that uses an ammonia-water mixture as the working fluid. The reader needs no more than a basic understanding of conventional water based Rankine cycle power plants to comprehend the basic thermodynamics, principles and arrangements of Kalina cycle power plants presented in this paper. The Kalina cycle is principally a modified Rankine cycle. The transformation starts with an important process change to the Rankine cycle--changing the working fluid in the cycle from a pure component (typically water) to a mixture of ammonia and water. The modifications that complete the transformation of the cycle from Rankine to Kalina consist of proprietary system designs that specifically exploit the virtues of the ammonia-water working fluid. These special designs, either applied individually or integrated together in a number of different combinations, comprise a family of unique Kalina cycle systems. This is somewhat analogous to the Rankine cycle which, in fact, has many design options such as reheat, regenerative heating, supercritical pressure, dual pressure, etc. all of which can be applied in a number of different combinations in a particular plant.

Micak, H.A.

1996-12-31T23:59:59.000Z

211

Towards Energy and Resource Efficient Manufacturing: A Processes and Systems Approach  

E-Print Network (OSTI)

ed version is the organic rankine cycle (ORC). In this caseUsing High-Speed Organic Rankine Cycle (ORC). International

2012-01-01T23:59:59.000Z

212

A review of test results on parabolic dish solar thermal power modules with dish-mounted rankine engines and for production of process steam  

SciTech Connect

This paper presents results of development testing of various solar thermal parabolic dish modules and assemblies. Most of the tests were at modules and assemblies that used a dish-mounted, organic Rankine cycle turbine for production of electric power. Some tests were also run on equipment for production of process steam or for production of electricity using dish-mounted reciprocating steam engines. These tests indicate that early modules achieve efficiencies of about 18 percent in converting sunlight to electricity (excluding the inverter but including parasitics). A number of malfunctions occurred. The performance measurements, as well as the malfunctions and other operating experience, provided information that should be of value in developing systems with improved performance and reduced maintenance.

Jaffe, L.D.

1988-11-01T23:59:59.000Z

213

Author's personal copy Towards optimization of a pyroelectric energy converter for harvesting waste heat  

E-Print Network (OSTI)

efficiencies. Organic Rankine cycles use organic working fluids such as refrigerants and hydrocarbons instead

Pilon, Laurent

214

A combined power and ejector refrigeration cycle for low temperature heat sources  

SciTech Connect

A combined power and ejector refrigeration cycle for low temperature heat sources is under investigation in this paper. The proposed cycle combines the organic Rankine cycle and the ejector refrigeration cycle. The ejector is driven by the exhausts from the turbine to produce power and refrigeration simultaneously. A simulation was carried out to analyze the cycle performance using R245fa as the working fluid. A thermal efficiency of 34.1%, an effective efficiency of 18.7% and an exergy efficiency of 56.8% can be obtained at a generating temperature of 395 K, a condensing temperature of 298 K and an evaporating temperature of 280 K. Simulation results show that the proposed cycle has a big potential to produce refrigeration and most exergy losses take place in the ejector. (author)

Zheng, B.; Weng, Y.W. [School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240 (China)

2010-05-15T23:59:59.000Z

215

Advanced Organic Vapor Cycles for Improving Thermal Conversion Efficiency in Renewable Energy Systems  

E-Print Network (OSTI)

DL Chase and PT Kehoe, "GE Combined-Cycle Product Line andand W Stenze, "Combined Cycle Heat Recovery Optimization,"bottoming cycle FOR combined cycle power plants," Applied

Ho, Tony

2012-01-01T23:59:59.000Z

216

Matthew S. Orosz e-mail: mso@mit.edu  

E-Print Network (OSTI)

Organic Rankine Cycles The application of organic Rankine cycles (ORCs) for small scale power generation, compactness factor, isentropic efficiency kilowatt-scale organic Rankine cycle Introduction The organic) thermal sources (e.g., geothermal, solar, and industrial). Organic Rankine cycle applications

Entekhabi, Dara

217

Rankin, Pennsylvania: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

form form View source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit with form History Facebook icon Twitter icon » Rankin, Pennsylvania: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 40.412569°, -79.879216° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":40.412569,"lon":-79.879216,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

218

Nr. 184 / 2011 // 24. Oktober 2011 Erfolgreicher FAN-Abschluss  

E-Print Network (OSTI)

von Stoffdatenmodellen auf dem Gebiet des Organic Rankine Cycle mit dem VDI-Preis ausgezeichnet. Dipl

Ullmann, G. Matthias

219

AMY V. MUELLER, PH.D. Em: amym@mit.edu  

E-Print Network (OSTI)

. 2013. Geometric Design of Scroll Expanders Optimized for Small Organic Rankine Cycles. ASME Journal

Entekhabi, Dara

220

August 22, 2002 Contribution to Stein, R. and Macdonald, R. W. (eds.) The Organic Carbon Cycle in  

E-Print Network (OSTI)

1 August 22, 2002 Contribution to Stein, R. and Macdonald, R. W. (eds.) The Organic Carbon Cycle. This problem is highlighted by a recent study of the carbon budget of the Mackenzie shelf by Macdonald et al

Eicken, Hajo

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


221

UNIVERSITA' DEL SALENTO Dipartimento di Ingegneria dell'Innovazione  

E-Print Network (OSTI)

OF DENSE GAS FLOWS: APPLICATION TO ORGANIC RANKINE CYCLES TURBINES Coordinatore del Ph.D. Ch.mo Prof. Ing FLOWS: APPLICATION TO ORGANIC RANKINE CYCLES TURBINES by Pietro Marco Congedo (ABSTRACT) This thesis as working fluids in Organic Rankine Cycles (ORCs). The ORCs are similar to a steam Rankine Cycle where

Paris-Sud XI, Université de

222

Performance prediction of micro-CHP systems using simple virtual operating cycles  

Science Journals Connector (OSTI)

Abstract This paper presents a general methodology to roughly estimate in advance the actual performance of ?-CHP (micro Combined Heat and Power) systems in one year of operation, by means of limited information on the CHP prime mover efficiency and emission factors in selected set points and by means of a simplified prediction model of the operating cycle. The carried out analysis has been applied to several market-available and under development ?-CHP units of different technologies (Internal Combustion Engines, Micro Gas Turbines, Organic Rankine Cycles, Stirling, Thermo Photo Voltaic, Fuel Cell), operated under a hypothetical virtual operating cycle. The virtual cycle is obtained in this paper on the basis of the year thermal demand of a domestic user, assuming thermal load following of the CHP system. The methodology can be generalized to different applications and different management logics of the CHP system.

M. Bianchi; A. De Pascale; F. Melino; A. Peretto

2014-01-01T23:59:59.000Z

223

Dynamic response of Earth's magnetosphere to By reversals K. Kabin, R. Rankin, and R. Marchand  

E-Print Network (OSTI)

Dynamic response of Earth's magnetosphere to By reversals K. Kabin, R. Rankin, and R. Marchand Citation: Kabin, K., R. Rankin, R. Marchand, T. I. Gombosi, C. R. Clauer, A. J. Ridley, V. O. Papitashvili

Michigan, University of

224

Utilization, cycling and vertical transport of particulate organic matter in the coastal marine environment  

SciTech Connect

This project was funded as part of the California Basin Study (CaBS), a DOE-funded regional program investigating production, cycling, transport, and fate of organic matter, chemical tracers, and pollutants in the Southern California Bight. The study area, adjacent to Los Angeles, was of programmatic interest due to its heavy concentration of energy-related activities, including offshore oil drilling and natural seeps, shipping, nuclear power facilities, and industrial and municipal ocean waste disposal. It was also of scientific interest because the wide continental margin in the region, pot-marked with natural sediment traps in the form of deep basins with restricted inputs and outputs, was ideal for integrating water-column and benthic studies and tracing the fates of in situ production and introduced pollutants. Our role in the CABS Program was to investigate the flux of particulate matter through the water column, emphasizing the relationship between macrozooplankton feeding and particle flux.

Landry, M.R.

1992-01-01T23:59:59.000Z

225

Advanced Organic Vapor Cycles for Improving Thermal Conversion Efficiency in Renewable Energy Systems  

E-Print Network (OSTI)

FOR A COMBINED POWER AND COOLING CYCLE," University ofcycle for combined power and cooling using low and midS Lu, "Novel combined power and cooling thermodynamic cycle

Ho, Tony

2012-01-01T23:59:59.000Z

226

Advanced binary cycles: Optimum working fluids  

SciTech Connect

A computer model (Cycle Analysis Simulation Tool, CAST) and a methodology have been developed to perform value analysis for small, low- to moderate-temperature binary geothermal power plants. The value analysis method allows for incremental changes in the levelized electricity cost (LEC) to be determined between a baseline plant and a modified plant. Thermodynamic cycle analyses and component sizing are carried out in the model followed by economic analysis which provides LEC results. The emphasis of the present work is on evaluating the effect of mixed working fluids instead of pure fluids on the LEC of a geothermal binary plant that uses a simple Organic Rankine Cycle. Four resources were studied spanning the range of 265 F to 375 F. A variety of isobutane and propane based mixtures, in addition to pure fluids, were used as working fluids. This study shows that the use of propane mixtures at a 265 F resource can reduce the LEC by 24% when compared to a base case value that utilizes commercial isobutane as its working fluid. The cost savings drop to 6% for a 375 F resource, where an isobutane mixture is favored. Supercritical cycles were found to have the lowest cost at all resources.

Gawlik, K.; Hassani, V. [National Renewable Energy Lab., Golden, CO (United States)

1997-12-31T23:59:59.000Z

227

A Lipid Biomarker Investigation of Organic Matter Sources and Methane Cycling in Alaskan Thaw Lake Sediments  

E-Print Network (OSTI)

in anoxic cold seep sediments”. PNAS. 11. 7663-7668.Cycling in Alaskan Thaw Lake Sediments A Thesis submitted inin Alaskan Thaw Lake Sediments by Mark Richard Williams

Williams, Mark

2012-01-01T23:59:59.000Z

228

Advanced Organic Vapor Cycles for Improving Thermal Conversion Efficiency in Renewable Energy Systems  

E-Print Network (OSTI)

to Gas Turbines & Applications (Solar Turbines)," in EPAOptimization of gas-turbine combined cycles for solar energythree typical gas turbines. Reprinted from Solar Turbines

Ho, Tony

2012-01-01T23:59:59.000Z

229

Advanced Organic Vapor Cycles for Improving Thermal Conversion Efficiency in Renewable Energy Systems  

E-Print Network (OSTI)

Systems for Industrial Waste Heat Recovery. c DanielCycle for Cement Kiln Waste Heat Recovery Power Plants. ”and high temperature waste heat reclamation and solar

Ho, Tony

2012-01-01T23:59:59.000Z

230

Rankin County, Mississippi: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Rankin County, Mississippi: Energy Resources Rankin County, Mississippi: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 32.2653668°, -89.9253233° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":32.2653668,"lon":-89.9253233,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

231

E-Print Network 3.0 - advanced potassium rankine Sample Search...  

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

steam directly to the turbine; for this example, the pressure chosen matches the subcritical Rankine Source: Australian National University, Department of Engineering,...

232

The cycling and oxidation pathways of organic carbon in a shallow estuary along the Texas Gulf Coast  

SciTech Connect

The cycling and oxidation pathways of organic carbon were investigated at a single shallow water estuarine site in Trinity Bay, Texas, the uppermost lobe of Galveston Bay, during November 2000. Radio-isotopes were used to estimate sediment mixing and accumulation rates, and benthic chamber and pore water measurements were used to determine sediment-water exchange fluxes of oxygen, nutrients and metals, and infer carbon oxidation rates.

Warnken, Kent W.; Santschi, Peter H.; Roberts, Kimberly A.; Gill, Gary A.

2007-08-08T23:59:59.000Z

233

Advanced Organic Vapor Cycles for Improving Thermal Conversion Efficiency in Renewable Energy Systems  

E-Print Network (OSTI)

Closed- Brayton-Cycle Solar Power Towers," ASME Journal ofNaF-NaBF4) cooled solar power tower plant is presented;high temperature solar power tower designs to date.

Ho, Tony

2012-01-01T23:59:59.000Z

234

Improving environmental performances of organic spreading technologies through the use of life cycle  

E-Print Network (OSTI)

) is generally used to assess environmental performances of a product or a system. Some agricultural LCA were, France Corresponding author*: marilys.pradel@cemagref.fr Abstract Life Cycle Assessment (LCA into account the direct contributions of agricultural machinery. In this paper, we develop the three step

Boyer, Edmond

235

Technology Development Program for an Advanced Potassium Rankine Power Conversion System Compatible with Several Space Reactor Designs  

SciTech Connect

This report documents the work performed during the first phase of the National Aeronautics and Space Administration (NASA), National Research Announcement (NRA) Technology Development Program for an Advanced Potassium Rankine Power Conversion System Compatible with Several Space Reactor Designs. The document includes an optimization of both 100-kW{sub e} and 250-kW{sub e} (at the propulsion unit) Rankine cycle power conversion systems. In order to perform the mass optimization of these systems, several parametric evaluations of different design options were investigated. These options included feed and reheat, vapor superheat levels entering the turbine, three different material types, and multiple heat rejection system designs. The overall masses of these Nb-1%Zr systems are approximately 3100 kg and 6300 kg for the 100- kW{sub e} and 250-kW{sub e} systems, respectively, each with two totally redundant power conversion units, including the mass of the single reactor and shield. Initial conceptual designs for each of the components were developed in order to estimate component masses. In addition, an overall system concept was presented that was designed to fit within the launch envelope of a heavy lift vehicle. A technology development plan is presented in the report that describes the major efforts that are required to reach a technology readiness level of 6. A 10-year development plan was proposed.

Yoder, G.L.

2005-10-03T23:59:59.000Z

236

PROCEEDINGS, Thirty-Seventh Workshop on Geothermal Reservoir Engineering Stanford University, Stanford, California, January 30 -February 1, 2012  

E-Print Network (OSTI)

: Organic Rankine Cycle) with maximal installed net capacity of 1.5MWe (Figure 1). Several deep geothermal

Boyer, Edmond

237

September 2, 2011 Competence Center for Sustainable Energy  

E-Print Network (OSTI)

for optimisation and certifying of energy consumption Organic Rankine Cycle (ORC) co-generation process for waste

Noé, Reinhold

238

Outputs and Interactions -04 1. Publications  

E-Print Network (OSTI)

). Andersen, W.C. and Bruno, T.J., "Rapid Screening of Fluids for Chemical Stability in Organic Rankine Cycle

Magee, Joseph W.

239

Selective Exhaust Gas Recycle with Membranes for CO2 Capture from Natural Gas Combined Cycle Power Plants  

Science Journals Connector (OSTI)

The combination of the combustion turbine (Brayton cycle) and steam turbine (Rankine cycle) yields a combined cycle power plant with efficiencies as high as 50%–55% (compared to 35%–40% in a typical subcritical pulverized coal power plant). ... Of course, it is also possible to combine these designs so that both parallel and series membranes are used. ...

Timothy C. Merkel; Xiaotong Wei; Zhenjie He; Lloyd S. White; J. G. Wijmans; Richard W. Baker

2012-11-27T23:59:59.000Z

240

Life cycle cost study for coated conductor manufacture by metal organic chemical vapor deposition  

SciTech Connect

The purpose of this report is to calculate the cost of producing high temperature superconducting wire by the Metal Organic Chemical Vapor Deposition (MOCVD) process. The technology status is reviewed from the literature and a plant conceptual design is assumed for the cost calculation. The critical issues discussed are the high cost of the metal organic precursors, the material utilization efficiency and the capability of the final product as measured by the critical current density achieved. Capital, operating and material costs are estimated and summed as the basis for calculating the cost per unit length of wire. Sensitivity analyses of key assumptions are examined to determine their effects on the final wire cost. Additionally, the cost of wire on the basis of cost per kiloampere per meter is calculated for operation at lower temperatures than the liquid nitrogen boiling temperature. It is concluded that this process should not be ruled out on the basis of high cost of precursors alone.

Chapman, J.N.

1999-07-13T23:59:59.000Z

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


241

Effects of organic silicon compounds as additives on charge–discharge cycling efficiencies of lithium in nonaqueous electrolytes for rechargeable lithium cells  

Science Journals Connector (OSTI)

Abstract Influence of mixing organic silicon compounds into 1 M (M: mol L?1) LiPF6-ethylene carbonate (EC)/ethylmethyl carbonate (EMC) (mixing volume ratio = 3:7) mixed solvent electrolytes on charge–discharge cycling efficiencies of lithium metal negative electrodes is examined. As organic silicon compounds, polyether-modified siloxanes with polyethylene oxide chains, chlorotrimethylsilane, tetraethoxysilane, cis-tetra [isobutyl (dimethylsiloxy)] cyclotetrasiloxane and cage-type silsesquioxane are investigated. Charge–discharge cycling tests of lithium are galvanostatically carried out using stainless steel working electrodes. Charge–discharge cycling efficiencies of lithium tend to improve by mixing organic silicon compounds. A cage-type silsesquioxane, octaphenyloctasilsesquioxane (Ph8T8) exhibits the highest cycling efficiency of approximately 80% with small mixing amount of 0.02 M Ph8T8. Mechanism of enhancement of lithium cycling efficiencies by mixing organic silicon compounds is considered to be due to the suppression of excess reduction of LiPF6-EC/EMC by lithium and the growth of surface film on lithium.

Ryota Yanagisawa; Hisayuki Endo; Masafumi Unno; Hideyuki Morimoto; Shin-ichi Tobishima

2014-01-01T23:59:59.000Z

242

Packaging and deployment of a 5. 5 MWe potassium---Rankine nuclear electric propulsion spacecraft  

SciTech Connect

A design study was performed to investigate packaging and deployment options for the potassium---Rankine, nuclear electric propulsion (NEP) spacecraft described by Rovang (1992). The subject spacecraft is the cargo portion of a split-sprint (cargo/piloted) Mars mission, carrying 144 mt of cargo. Two parallel SP-100 type reactors, potassium---Rankine power conversion assemblies, and argon ion thrusters are utilized in the selected architecture. A spacecraft design and deployment approach which uses two heavy lift launch vehicles (HLLV) to insert the entire spacecraft into low Earth orbit is presented.

Rovang, R.D.; Marko, M. (Rockwell International, Rocketdyne Division, 6633 Canoga Avenue, P.O. Box 7922, Canoga Park, California 91309-7922 (United States))

1993-01-20T23:59:59.000Z

243

Exergy Analysis of Scroll-Based Rankine Cycles with Various Working Fluids  

Science Journals Connector (OSTI)

In this study the possibility of converting scroll compressor into expander is investigated. Refrigeration equipment manufacturers produce scroll compressors massively for refrigeration and air conditioning appli...

E. Oralli; Ibrahim Dincer

2014-01-01T23:59:59.000Z

244

E-Print Network 3.0 - advanced rankine cycle Sample Search Results  

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

two-tank molten... C. Figure 6. Temperature-entropy diagram for a reheat-regenerative subcritical ... Source: Australian National University, Department of Engineering, Solar...

245

Reduced gravity rankine cycle design and optimization with passive vortex phase separation  

E-Print Network (OSTI)

. Potential drawbacks to the technology in a reduced gravity environment include two-phase fluid management processes such as liquid-vapor phase separation. The most critical location for phase separation is at the boiler exit where only vapor must be sent...

Supak, Kevin Robert

2009-05-15T23:59:59.000Z

246

Some Alkali Metal Corrosion Effects in a Rankine Cycle Test Loop  

Science Journals Connector (OSTI)

A two-loop lithium-boiling potassium facility was constructed and tested at the Jet Propulsion Laboratory to simulate the major elements and working fluids of a two-loop, nuclear, turbo-plant concept of intere...

Wayne M. Phillips

1970-01-01T23:59:59.000Z

247

Optimisation criteria of a Rankine steam cycle powered by thorium HTR / Steven Cronier van Niekerk.  

E-Print Network (OSTI)

??HOLCIM has various cement production plants across India. These plants struggle to produce the projected amount of cement due to electricity shortages. Although coal is… (more)

Van Niekerk, Steven Cronier

2014-01-01T23:59:59.000Z

248

Influence of temperature difference calculation method on the evaluation of Rankine cycle performance  

Science Journals Connector (OSTI)

In the new century, energy and environmental problems are becoming more critical, and the development of natural energy is desired. Low-grade Thermal Energy Conversion (LTEC) is refocused as one of the renewable ...

Takafumi. Morisaki; Yasuyuki. Ikegami

2014-02-01T23:59:59.000Z

249

Review of alkali metal and refractory alloy compatibility for Rankine cycle applications  

Science Journals Connector (OSTI)

The principal corrosion mechanisms in refractory metal-alkali systems are dissolution, mass transfer, and impurity reactions. In general, niobium, tantalum, molybdenum, and tungsten have low solubilities in th...

James R. DiStefano

1989-12-01T23:59:59.000Z

250

The Conversion of Low-Grade Heat into Power Using Supercritical Rankine Cycles.  

E-Print Network (OSTI)

??Low-grade heat sources, here defined as below 300 ºC, are abundantly available as industrial waste heat, solar thermal, and geothermal, to name a few. However,… (more)

Chen, Huijuan

2010-01-01T23:59:59.000Z

251

An investigation into the performance of a Rankine-heat pump combined cycle / Stephanus Phillipus Oelofse.  

E-Print Network (OSTI)

??The global growth in electricity consumption and the shortcomings of renewable electricity generation technologies are some of the reasons why it is still relevant to… (more)

Oelofse, Stephanus Phillipus

2012-01-01T23:59:59.000Z

252

Biogeochemical cycling in an organic-rich coastal marine basin. 10. The role of amino acids in sedimentary carbon and nitrogen cycling  

SciTech Connect

Hydrolyzable amino acids were measured in cores and surface sediment samples collected over a 14 month period from the rapidly accumulating, anoxic sediments of Cape Lookout Bight, NC. The concentration of total hydrolyzable amino acids (THAAs) shows an exponential decrease with depth, in a manner similar to total organic carbon and total nitrogen. Carbon and nitrogen in THAAs averages 10-15% of the total organic carbon and 30-40% of the total nitrogen in these sediments. In surface sediments the concentration of THAAs do not show strong seasonal variations, with the exception of a small apparent decrease during the winter months. Aspartic acid, glutamic acid, glycine and alanine are the most abundant individual amino acids in Cape Lookout Bight sediments. The distribution of individual amino acids in these sediments is very similar to that observed in the two major sources of organic matter, vascular salt marsh plants and marine plankton. The mole fractions of most amino acids show no depth variation in Cape Lookout Bight sediments. Kinetic modeling of these data indicates that the deposition of amino acids to the surface of these sediments is 5.8 {plus minus} 1.0 mol{center dot}m{sup {minus}2}{center dot}yr{sup {minus}1}. Approximately 46 {plus minus} 16% of this input is remineralized in the upper 40 cm. The recycling of amino acids accounts for 82 {plus minus} 43% of the total nitrogen regeneration and 27 {plus minus} 11% of the regeneration of total organic carbon in these sediments. The mean residence time of metabolizable amino acids is approx. 9 months, a value which is comparable to the mean residence time of both metabolizable organic carbon and nitrogen in these sediments.

Burdige, D.J.; Martens, C.S. (Univ. of North Carolina, Chapel Hill (USA))

1988-06-01T23:59:59.000Z

253

Mobile DNA can drive lineage extinction in prokaryotic populations D. J. RANKIN* , M. BICHSEL* & A. WAGNER*  

E-Print Network (OSTI)

Mobile DNA can drive lineage extinction in prokaryotic populations D. J. RANKIN* , M. BICHSEL* & A of Bioinformatics, Quartier Sorge Ba^timent Ge´nopode, Lausanne, Switzerland Introduction Mobile genetic elements the individual or the population. Mobile genetic elements illustrate this principle well, because they can self

Rankin, Daniel

254

Towards model-based control of a steam Rankine process for engine waste heat recovery  

E-Print Network (OSTI)

Towards model-based control of a steam Rankine process for engine waste heat recovery Johan Peralez steam process for exhaust gas heat recovery from a spark-ignition engine, focusing in particular results on a steam process for SI engines, [3] on generic control issues and [4] which provides a comp

Paris-Sud XI, Université de

255

APPLICATION OF TURBOMACHINERY IN SOLAR-ASSISTED RANKINE COOLING SYSTEMS  

E-Print Network (OSTI)

F. , jr. S. B. , S. M. Steam Turbines. Second Edition, Tenththe solar-assisted cycle. Steam turbines have been used forin Figure 5. Steam entering the turbine expends a portion of

Leech, J.

2010-01-01T23:59:59.000Z

256

APPLICATION OF TURBOMACHINERY IN SOLAR-ASSISTED RANKINE COOLING SYSTEMS  

E-Print Network (OSTI)

COP vapor cycle Turbo-expander efficiency With these valuesMULTI~STAGE AA1AL FLOW TURBO-EXPANDER CONCEPTS AXIAL FLOW 4.SUMMARY A variety of turbo-expanders were considered for use

Leech, J.

2010-01-01T23:59:59.000Z

257

Innovative biomass to power conversion systems based on cascaded supercritical CO2 Brayton cycles  

Science Journals Connector (OSTI)

Abstract In the small to medium power range the main technologies for the conversion of biomass sources into electricity are based either on reciprocating internal combustion or organic Rankine cycle engines. Relatively low energy conversion efficiencies are obtained in both systems due to the thermodynamic losses in the conversion of biomass into syngas in the former, and to the high temperature difference in the heat transfer between combustion gases and working fluid in the latter. The aim of this paper is to demonstrate that higher efficiencies in the conversion of biomass sources into electricity can be obtained using systems based on the supercritical closed CO2 Brayton cycles (s-CO2). The s-CO2 system analysed here includes two cascaded supercritical CO2 cycles which enable to overcome the intrinsic limitation of the single cycle in the effective utilization of the whole heat available from flue gases. Both part-flow and simple supercritical CO2 cycle configurations are considered and four boiler arrangements are investigated to explore the thermodynamic performance of such systems. These power plant configurations, which were never explored in the literature for biomass conversion into electricity, are demonstrated here to be viable options to increase the energy conversion efficiency of small-to-medium biomass fired power plants. Results of the optimization procedure show that a maximum biomass to electricity conversion efficiency of 36% can be achieved using the cascaded configuration including a part flow topping cycle, which is approximately 10%-points higher than that of the existing biomass power plants in the small to medium power range.

Giovanni Manente; Andrea Lazzaretto

2014-01-01T23:59:59.000Z

258

Fuel Cell Power SystemFuel Cell Power System May 21, 2003  

E-Print Network (OSTI)

/ Commercial / Industrial Transportation Fleet Vehicles Automotive Fuel Cell Microturbine Organic Rankine Cycle · Technical Goals and Objectives · Organization and Team Structure · Background and Program Overview

259

One-pot synthesis of a metal–organic framework as an anode for Li-ion batteries with improved capacity and cycling stability  

SciTech Connect

Metal–organic framework is a kind of novel electrode materials for lithium ion batteries. Here, a 3D metal–organic framework Co{sub 2}(OH){sub 2}BDC (BDC=1,4-benzenedicarboxylate) was synthesized for the first time by the reaction of Co{sup 2+} with a bio-inspired renewable organic ligand 1,4-benzenedicarboxylic acid through a solvothermal method. As an anode material for lithium ion batteries, this material exhibited an excellent cyclic stability as well as a large reversible capacity of ca. 650 mA h g{sup ?1} at a current density of 50 mA g{sup ?1} after 100 cycles within the voltage range of 0.02–3.0 V, higher than that of other BDC based anode. - Graphical abstract: The PXRD pattern and the cycleability curves (inset) of Co{sub 2}(OH){sub 2}BDC. Display Omitted - Highlights: • Co{sub 2}(OH){sub 2}BDC was synthesized through a one pot solvothermal process. • The solvent had a great effect on the purity of this material. • This material was used as anode material for lithium ion batteries for the first time. • Co{sub 2}(OH){sub 2}BDC showed improved capacity and cycling stability.

Gou, Lei, E-mail: Leigou@chd.edu.cn; Hao, Li-Min; Shi, Yong-Xin; Ma, Shou-Long; Fan, Xiao-Yong; Xu, Lei; Li, Dong-Lin, E-mail: dlli@chd.edu.cn; Wang, Kang

2014-02-15T23:59:59.000Z

260

The effect of a large resuspension event in Southern Lake Michigan on the short-term cycling of organic contaminants  

E-Print Network (OSTI)

1 The effect of a large resuspension event in Southern Lake Michigan on the short-term cycling intensive campaigns before and after the resuspension event and 2) settling sediment collected using a time from increased gas-phase deposition due to the resuspension event was 8 kg for PCBs and 2200 kg

NOAA Great Lakes Environmental Research Laboratory, Episodic Events

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


261

The Effect of a Large Resuspension Event in Southern Lake Michigan on the Short-term Cycling of Organic Contaminants  

E-Print Network (OSTI)

The Effect of a Large Resuspension Event in Southern Lake Michigan on the Short-term Cycling and after a major resuspension event. It was found that major resuspension events result in a large flux of that occurred in the month of March after a series of intense storms induced a large- scale resuspension event

262

A review of "Secrets and Knowledge in Medicine and Science, 1500-1800" edited by Elaine Leong and Alisha Rankin  

E-Print Network (OSTI)

of the view of musicians in the seventeenth and eighteenth centuries that do not necessarily re#24; ect a historical development. Elaine Leong and Alisha Rankin, eds. Secrets and Knowledge in Medicine and Science, 1500-1800. Farnham, England and Burlington... of the view of musicians in the seventeenth and eighteenth centuries that do not necessarily re#24; ect a historical development. Elaine Leong and Alisha Rankin, eds. Secrets and Knowledge in Medicine and Science, 1500-1800. Farnham, England and Burlington...

Kelter, Irving A.

2012-01-01T23:59:59.000Z

263

Thermodynamic analysis of a closed-cycle, solar gas-turbine plant  

Science Journals Connector (OSTI)

Thermodynamic analysis of a closed-cycle, Brayton gas-turbine plant with a heat exchanger powered by the sun has been studied. A Brayton cycle is simpler than a Rankine cycle and has an advantage in places where water is scarce and expensive. A simple expression is derived for calculating the efficiency of the cycle in terms of the compression pressure ratio, the pressure loss coefficient and the ratio of the lower to higher temperature in the cycle with the efficiency of various components. The maximum permissible pressure loss coefficient has also been calculated.

P. Gandhidasan

1993-01-01T23:59:59.000Z

264

Biogeochemical cycling in an organic-rich coastal marine basin. 9. Sources and accumulation rates of vascular plant-derived organic material  

SciTech Connect

The sources, degradation and burial of vascular plant debris deposited over the past several decades in the lagoonal sediments of Cape Lookout Bight, North Carolina, are quantified using alkaline cupric oxide lignin oxidation product (LOP) analysis. Non-woody angiosperms, accounting for 92 {plus minus} 32% of the recognizable sedimentary vascular plant debris, are calculated to contribute 23 {plus minus} 17% of the total organic carbon buried over the past decade. When combined with a previously established sedimentary organic carbon budget for this site a vascular plant derived carbon burial rate of 26 {plus minus}20 mole C m{sup {minus}2} yr{sup {minus}1} is calculated for this same time interval. The refractory nature and invariant depth distributions of the lignin oxidation products (LOP), when coupled with evidence for constant degradation rates of metabolizable materials, indicate that sediment accumulation at this site has been a steady state process with respect to source and burial of organic carbon since its conversion from an inner-continental shelf to a lagoonal environment during the late 1960's. Thus systematic down-core decreases in labile organic matter result from early diagenetic processes rather than input rate variations.

Haddad, R.I.; Martens, C.S. (Univ. of North Carolina, Chapel Hill (USA))

1987-11-01T23:59:59.000Z

265

Modular symbols for reductive groups and p-adic Rankin-Selberg convolutions over number fields  

E-Print Network (OSTI)

We give a construction of a wide class of modular symbols attached to reductive groups. As an application we construct a p-adic distribution interpolating the special values of the twisted Rankin-Selberg L-function attached to cuspidal automorphic representations of GL(n) and GL(n-1) over number fields. If the representations are ordinary at p, our distribution is bounded and gives rise to a p-adic L-function.

Januszewski, Fabian

2009-01-01T23:59:59.000Z

266

Supercritical Water Reactor Cycle for Medium Power Applications  

SciTech Connect

Scoping studies for a power conversion system based on a direct-cycle supercritical water reactor have been conducted. The electric power range of interest is 5-30 MWe with a design point of 20 MWe. The overall design objective is to develop a system that has minimized physical size and performs satisfactorily over a broad range of operating conditions. The design constraints are as follows: Net cycle thermal efficiency {ge}20%; Steam turbine outlet quality {ge}90%; and Pumping power {le}2500 kW (at nominal conditions). Three basic cycle configurations were analyzed. Listed in order of increased plant complexity, they are: (1) Simple supercritical Rankine cycle; (2) All-supercritical Brayton cycle; and (3) Supercritical Rankine cycle with feedwater preheating. The sensitivity of these three configurations to various parameters, such as reactor exit temperature, reactor pressure, condenser pressure, etc., was assessed. The Thermoflex software package was used for this task. The results are as follows: (a) The simple supercritical Rankine cycle offers the greatest hardware simplification, but its high reactor temperature rise and reactor outlet temperature may pose serious problems from the viewpoint of thermal stresses, stability and materials in the core. (b) The all-supercritical Brayton cycle is not a contender, due to its poor thermal efficiency. (c) The supercritical Rankine cycle with feedwater preheating affords acceptable thermal efficiency with lower reactor temperature rise and outlet temperature. (d) The use of a moisture separator improves the performance of the supercritical Rankine cycle with feedwater preheating and allows for a further reduction of the reactor outlet temperature, thus it was selected for the next step. Preliminary engineering design of the supercritical Rankine cycle with feedwater preheating and moisture separation was performed. All major components including the turbine, feedwater heater, feedwater pump, condenser, condenser pump and pipes were modeled with realistic assumptions using the PEACE module of Thermoflex. A three-dimensional layout of the plant was also generated with the SolidEdge software. The results of the engineering design are as follows: (i) The cycle achieves a net thermal efficiency of 24.13% with 350/460 C reactor inlet/outlet temperatures, {approx}250 bar reactor pressure and 0.75 bar condenser pressure. The steam quality at the turbine outlet is 90% and the total electric consumption of the pumps is about 2500 kWe at nominal conditions. (ii) The overall size of the plant is attractively compact and can be further reduced if a printed-circuit-heat-exchanger (vs shell-and-tube) design is used for the feedwater heater, which is currently the largest component by far. Finally, an analysis of the plant performance at off-nominal conditions has revealed good robustness of the design in handling large changes of thermal power and seawater temperature.

BD Middleton; J Buongiorno

2007-04-25T23:59:59.000Z

267

Organization  

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

Organization Print Organization Print 2012-12 org chart A complete ALS organization chart (June 2013) is available in PDF. Appointed and elected members of advisory panels provide guidance to Berkeley Lab and ALS management in developing the ALS scientific and user programs. ALS Staff Photo staff photo thumb Click on the image to see a recent photo of ALS staff in front of the dome. The photo was taken on May 14, 2013. ALS Management and Advisory Team Steve Kevan, Deputy Division Director, Science Michael J. Banda, Deputy Division Director, Operations Robert W. Schoenlein, Senior Staff Scientist, Next Generation Light Source Initiative Janos Kirz, Scientific Advisor Paul Adams, Division Deputy for Biosciences ALS Scientific, Technical, and User Support Groups Accelerator Physics

268

Utilization, cycling and vertical transport of particulate organic matter in the coastal marine environment. Final project report, November 15, 1987--May 14, 1992  

SciTech Connect

This project was funded as part of the California Basin Study (CaBS), a DOE-funded regional program investigating production, cycling, transport, and fate of organic matter, chemical tracers, and pollutants in the Southern California Bight. The study area, adjacent to Los Angeles, was of programmatic interest due to its heavy concentration of energy-related activities, including offshore oil drilling and natural seeps, shipping, nuclear power facilities, and industrial and municipal ocean waste disposal. It was also of scientific interest because the wide continental margin in the region, pot-marked with natural sediment traps in the form of deep basins with restricted inputs and outputs, was ideal for integrating water-column and benthic studies and tracing the fates of in situ production and introduced pollutants. Our role in the CABS Program was to investigate the flux of particulate matter through the water column, emphasizing the relationship between macrozooplankton feeding and particle flux.

Landry, M.R.

1992-10-01T23:59:59.000Z

269

Waste Heat-to-Power in Small Scale Industry Using Scroll Expander...  

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

Waste Heat-to-Power in Small Scale Industry Using Scroll Expander for Organic Rankine Bottoming Cycle Development of an Efficient, Cost- Effective System to Recover Medium- Grade...

270

Proceedings of the 12th Sede Boker Symposium on Solar Electricity Production 3 February 23-24, 2004  

E-Print Network (OSTI)

Electricity Production February 23-24, 2004 2. Solar operated organic Rankine cycle units for 0.2 to 10 MWe

Prigozhin, Leonid

271

Heat waste recovery system from exhaust gas of diesel engine to a reciprocal steam engine.  

E-Print Network (OSTI)

??This research project was about the combined organic Rankine cycle which extracted energy from the exhaust gas of a diesel engine. There was a study… (more)

Duong, Tai Anh

2011-01-01T23:59:59.000Z

272

Painting by numbersPrinting paintings in 3D Timo de Rijk  

E-Print Network (OSTI)

Delft #12;2 Nuna7 wins again 16 Less heat loss thanks to Organic Rankine Cycle 3D reproduction of paintings

Lindken, Ralph

273

Microsoft Word - INL_EXT-13-30173 simulation of air-cooled ORC...  

Office of Scientific and Technical Information (OSTI)

Organic Rankine Cycle Geothermal Power Plant Performance 1. Introduction Geothermal energy is a renewable energy source that provides reliable base load power generation....

274

Bioelectrochemical Integration of Waste Heat Recovery, Waste...  

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

(ex: organic Rankine cycle) High installed KW capital Low temperature waste heat (<100C) is not practicable Further efficiency loss in electrolytic conversion to...

275

Biogeochemical cycling in an organic-rich coastal marine basin. 5. Sedimentary nitrogen and phosphorus budgets based upon kinetic models, mass balances, and the stoichiometry of nutrient regeneration  

SciTech Connect

The rapid rates of sediment accumulation (approx.10-20 cm/yr) in the recently formed Cape Lookout Bight, North Carolina, have resulted in the deposition of approximately 157 moles of carbon, 14 moles of nitrogen and 1.3 moles of phosphorus, per square meter annually. The metabolism of the organic matter in these anoxic sediments is dominated by sulfate reduction and fermentation reactions. Sedimentary nitrogen and phosphorus budgets are estimated using 3 related approaches: 1) a kinetic model of solid phase diagenesis; 2) direct measurements of nutrient burial and regeneration; and 3) nutrient recycling rates estimated from annual rates of sulfate reduction and the SO/sub 4/:NH/sub 4/ and SO/sub 4/:PO/sub 4/ stoichiometry of nutrient regeneration. The mass balances derived agree reasonably well and indicate that approximately 30% of the total nitrogen and 15% of the total phosphorus deposited in these sediments are recycled. The mean residence time for recycled nutrients within the sediment is 4 to 6 months for nitrogen and 1.5 to 2 years for phosphorus. Nitrogen regeneration, like carbon, appears to be controlled by the microbially-mediated metabolism of labile organic matter. The greater asymmetry and lower percent turnover in phosphorus cycling is apparently due to changes in its solubility under oxidized and reduced conditions and selective regeneration prior to deposition.

Klump, J.V.; Martens, C.S.

1987-05-01T23:59:59.000Z

276

Home composting as an alternative treatment option for organic household waste in Denmark: An environmental assessment using life cycle assessment-modelling  

SciTech Connect

An environmental assessment of the management of organic household waste (OHW) was performed from a life cycle perspective by means of the waste-life cycle assessment (LCA) model EASEWASTE. The focus was on home composting of OHW in Denmark and six different home composting units (with different input and different mixing frequencies) were modelled. In addition, incineration and landfilling was modelled as alternatives to home composting. The most important processes contributing to the environmental impact of home composting were identified as greenhouse gas (GHG) emissions (load) and the avoided emissions in relation to the substitution of fertiliser and peat when compost was used in hobby gardening (saving). The replacement of fertiliser and peat was also identified as one of the most sensible parameters, which could potentially have a significant environmental benefit. Many of the impact categories (especially human toxicity via water (HTw) and soil (HTs)) were affected by the heavy metal contents of the incoming OHW. The concentrations of heavy metals in the compost were below the threshold values for compost used on land and were thus not considered to constitute a problem. The GHG emissions were, on the other hand, dependent on the management of the composting units. The frequently mixed composting units had the highest GHG emissions. The environmental profiles of the home composting scenarios were in the order of -2 to 16 milli person equivalents (mPE) Mg{sup -1} wet waste (ww) for the non-toxic categories and -0.9 to 28 mPE Mg{sup -1} ww for the toxic categories. Home composting performed better than or as good as incineration and landfilling in several of the potential impact categories. One exception was the global warming (GW) category, in which incineration performed better due to the substitution of heat and electricity based on fossil fuels.

Andersen, J.K.; Boldrin, A.; Christensen, T.H. [Department of Environmental Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby (Denmark); Scheutz, C., E-mail: chas@env.dtu.dk [Department of Environmental Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby (Denmark)

2012-01-15T23:59:59.000Z

277

UEC MSP OPSYE, Technologie des centrales nuclaires Projets d'Approfondissement Autonome  

E-Print Network (OSTI)

http://florent.ravelet.free.fr/uec.html Liens utiles : http://organic-rankine-cycle.blogspot.fr http sera divis� en deux �quipes mises en concurrence. Les cycles � r�aliser sont du type cycle de Hirn-Rankine, circuit hydraulique...). La moiti� du groupe (TSx1) travaillera sur un cycle utilisant l'eau, l

Ravelet, Florent

278

Dynamic power systems for power generation  

SciTech Connect

The characteristics of dynamic power systems have considerable potential value, especially for the space station. The base of technology that makes these dynamic power systems practical is reviewed. The following types of power-generating systems are examined herein: organic Rankine cycle, potassium Rankine cycle, Brayton cycle, and Stirling cycle.

English, R.E.

1984-04-01T23:59:59.000Z

279

SUPERCRITICAL STEAM CYCLE FOR NUCLEAR POWER PLANT  

SciTech Connect

Revolutionary improvement of the nuclear plant safety and economy with light water reactors can be reached with the application of micro-fuel elements (MFE) directly cooled by a supercritical pressure light-water coolant-moderator. There are considerable advantages of the MFE as compared with the traditional fuel rods, such as: Using supercritical and superheated steam considerably increases the thermal efficiency of the Rankine cycle up to 44-45%. Strong negative coolant and void reactivity coefficients with a very short thermal delay time allow the reactor to shutdown quickly in the event of a reactivity or power excursion. Core melting and the creation of corium during severe accidents are impossible. The heat transfer surface area is larger by several orders of magnitude due to the small spherical dimensions of the MFE. The larger heat exchange surface significantly simplifies residual heat removal by natural convection and radiation from the core to a subsequent passive system of heat removal.

Tsiklauri, Georgi V.; Talbert, Robert J.; Schmitt, Bruce E.; Filippov, Gennady A.; Bogojavlensky, Roald G.; Grishanin, Evgeny I.

2005-07-01T23:59:59.000Z

280

Airfoil Shape Optimization for Transonic Flows of BetheZel'dovichThompson Fluids  

E-Print Network (OSTI)

, in organic Rankine cycles (ORCs). Specific interest has developed in a particular class of dense gases, known in the same way as classical steam Rankine cycles, but due to the use of low-boiling compounds as working by their potential technological advantages as working fluids in energy- conversion cycles and, specifically

Paris-Sud XI, Université de

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


281

Multiple reheat helium Brayton cycles for sodium fast reactors  

SciTech Connect

Sodium fast reactors (SFR) traditionally adopt the steam Rankine cycle for power conversion. The resulting potential for water-sodium reaction remains a continuing concern which at least partly delays the SFR technology commercialization and is a contributor to higher capital cost. Supercritical CO2 provides an alternative, but is also capable of sustaining energetic chemical reactions with sodium. Recent development on advanced inert-gas Brayton cycles could potentially solve this compatibility issue, increase thermal efficiency, and bring down the capital cost close to light water reactors. In this paper, helium Brayton cycles with multiple reheat and intercooling states are presented for SFRs with reactor outlet temperatures in the range of 510°C to 650°C. The resulting thermal efficiencies range from 39% and 47%, which is comparable with supercritical recompression CO2 cycles (SCO2 cycle). A systematic comparison between multiple reheat helium Brayton cycle and the SCO2 cycle is given, considering compatibility issues, plant site cooling temperature effect on plant efficiency, full plant cost optimization, and other important factors. The study indicates that the multiple reheat helium cycle is the preferred choice over SCO2 cycle for sodium fast reactors.

Haihua Zhao; Per F. Peterson

2008-07-01T23:59:59.000Z

282

Development of Pillared M(IV) Phosphate Phosphonate Inorganic Organic Hybrid Ion Exchange Materials for Applications in Separations found in the Nuclear Fuel Cycle  

E-Print Network (OSTI)

This dissertation focuses on key intergroup and intragroup separations found in the back end of the nuclear fuel cycle, specifically americium from lanthanides and americium from other actinides, most importantly americium from curium. Our goal...

Burns, Jonathan

2012-10-02T23:59:59.000Z

283

C-CAMP, A closed cycle alkali metal power system  

SciTech Connect

A concept is presented for a Closed-Cycle Alkali Metal (C-CAMP) power systems which utilizes the heat of reaction of an alkali metal and halogen compound to vaporize an alkali metal turbine fluid for a Rankine cycle. Unique features of the concept are (1) direct contact (heat exchange) between the reaction products and turbine fluid, and (2) a flow-through chemical reactor/boiler. The principal feasibility issues of the concept relate to the degree of cross-mixing of product and turbine fluid streams within the reactor-boiler. If proven feasible, the concept may be adapted to a range of fuel and turbine fluids and ultimately lead to thermal efficiencies in excess of 35%.

Wichner, R.P.; Hoffman, H.W.

1988-01-01T23:59:59.000Z

284

Software and Information Life Cycle (SILC) for the Integrated Information Services Organization. Analysis and implementation phase adaptations of the Sandia software guidelines: Issue A, April 18, 1995  

SciTech Connect

This document describes the processes to be used for creating corporate information systems within the scope of the Integrated information Services (IIS) Center. This issue A describes the Analysis and Implementation phases within the context of the entire life cycle. Appendix A includes a full set of examples of the analysis set deliverables. Subsequent issues will describe the other life cycle processes as we move toward enterprise-level management of information assets, including information meta-models and an integrated corporate information model. The analysis phase as described here, when combined with a specifications repository, will provide the basis for future reusable components and improve traceability of information system specifications to enterprise business rules.

Eaton, D.; Cassidy, A.; Cuyler, D. [and others

1995-07-01T23:59:59.000Z

285

INTERNATIONAL JOURNAL OF STRUCTURAL CHANGES IN SOLIDS Mechanics and Applications Volume 2, Number2 , November 2010, pp.25-31  

E-Print Network (OSTI)

into Thermal Energy Storage (TES) devices. Thermodynamic cycles (such as Rankine or Stirling cycle of the conventional TES units is restricted to ~ 400 �C due to the thermal decomposition temperatures of the organic

Banerjee, Debjyoti

286

UH1~~~~~~~~~~~~~~~~MTI 79TR68 *HI~~~~~ ~~FINAL REPORT  

E-Print Network (OSTI)

UHI~~~~~~~LIST OF FIGURES Number Page 1-1 MTI Design for an Organic Rankine Turbo-Alternator- *fl ~Pump Unit .......... . . . . . . . . . . . . . . . 1-3 1-2 MTI Design for a Gas-Fired Organic Rankine Design Approach ............... 2-10 2.3 Steam and Refrigerant Cycles ............. 2-13 3HI~2.4 Decision

Oak Ridge National Laboratory

287

Thermodynamic performance analysis of a combined power cycle using low grade heat source and LNG cold energy  

Science Journals Connector (OSTI)

Abstract Thermodynamic analysis of a combined cycle using a low grade heat source and LNG cold energy was carried out. The combined cycle consisted of an ammonia–water Rankine cycle with and without regeneration and a LNG Rankine cycle. A parametric study was conducted to examine the effects of the key parameters, such as ammonia mass fraction, turbine inlet pressure, condensation temperature. The effects of the ammonia mass fraction on the temperature distributions of the hot and cold streams in heat exchangers were also investigated. The characteristic diagram of the exergy efficiency and heat transfer capability was proposed to consider the system performance and expenditure of the heat exchangers simultaneously. The simulation showed that the system performance is influenced significantly by the parameters with the ammonia mass fraction having largest effect. The net work output of the ammonia–water cycle may have a peak value or increase monotonically with increasing ammonia mass fraction, which depends on turbine inlet pressure or condensation temperature. The exergy efficiency may decrease or increase or have a peak value with turbine inlet pressure depending on the ammonia mass fraction.

Kyoung Hoon Kim; Kyung Chun Kim

2014-01-01T23:59:59.000Z

288

Towards Energy and Resource Efficient Manufacturing: A Processes and Systems Approach  

E-Print Network (OSTI)

the organic rankine cycle (ORC). In this case an organic ?temperature applications the ORC has more bene?ts than the117] demonstrated that the ORC-process can use the exhaust

2012-01-01T23:59:59.000Z

289

Waste Heat-to-Power in Small Scale Industry Using Scroll Expander...  

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

Waste Heat-to-Power in Small Scale Industry Using Scroll Expander for Organic Rankine Bottoming Cycle Waste Heat-to-Power in Small Scale Industry Using Scroll Expander for Organic...

290

Tsiklauri-Durst combined cycle (T-D Cycle{trademark}) application for nuclear and fossil-fueled power generating plants  

SciTech Connect

The Tsiklauri-Durst combined cycle is a combination of the best attributes of both nuclear power and combined cycle gas power plants. A technology patented in 1994 by Battelle Memorial Institute offers a synergistic approach to power generation. A typical combined cycle is defined as the combination of gas turbine Brayton Cycle, topping steam turbine Rankine Cycle. Exhaust from the gas turbine is used in heat recovery steam generators to produce steam for a steam turbine. In a standard combined cycle gas turbine-steam turbine application, the gas turbine generates about 65 to 70 percent of system power. The thermal efficiency for such an installation is typically about 45 to 50 percent. A T-D combined cycle takes a new, creative approach to combined cycle design by directly mixing high enthalpy steam from the heat recovery steam generator, involving the steam generator at more than one pressure. Direct mixing of superheated and saturated steam eliminates the requirement for a large heat exchanger, making plant modification simple and economical.

Tsiklauri, B.; Korolev, V.N.; Durst, B.M.; Shen, P.K.

1998-07-01T23:59:59.000Z

291

Cycle cover with short cycles Nicole Immorlica  

E-Print Network (OSTI)

Introduction Given a graph and a subset of marked elements (nodes, edges, or some combination thereof), a cycleCycle cover with short cycles Nicole Immorlica£ Mohammad Mahdian£ Vahab S. Mirrokni£ Abstract Cycle for variants of cycle covering problems which bound the size and/or length of the covering cycles

Immorlica, Nicole

292

Carbon Cycle  

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

Carbon Cycle Carbon Cycle Latest Global Carbon Budget Estimates Including CDIAC Estimates Terrestrial Carbon Management Data Sets and Analyses Carbon Dioxide Emissions from Fossil-Fuel Consumption and Cement Manufacture, (2011) Annual Fossil-Fuel CO2 Emissions: Mass of Emissions Gridded by One Degree Latitude by One Degree Longitude (2012) Monthly Fossil-Fuel CO2 Emissions: Mass of Emissions Gridded by One Degree Latitude by One Degree Longitude (2012) Annual Fossil-Fuel CO2 Emissions: Global Stable Carbon Isotopic Signature (2012) Monthly Fossil-Fuel CO2 Emissions: Isomass (δ 13C) of Emissions Gridded by One Degree Latitude by One Degree Longitude (2012) AmeriFlux - Terrestrial Carbon Dioxide, Water Vapor, and Energy Balance Measurements Estimates of Monthly CO2 Emissions and Associated 13C/12C Values

293

NREL: U.S. Life Cycle Inventory Database - Related Links  

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

Related Links Related Links Below are links to life cycle inventory (LCI) databases, life cycle assessment (LCA) information, LCA tools, research institutes utilizing LCA, labeling initiatives and organizations, international LCA initiatives, LCA online forums. Life Cycle Inventory Data Ecoinvent: Swiss Centre for Life Cycle Inventories IVAM LCA Data 4: Dutch LCA Database KITECH (Korea Institute of Industrial Technology): Korea National Cleaner Production Center LCI Database Life Cycle Assessment Information IERE (The Institute for Environmental Research and Education): The American Center for Life Cycle Assessment SETAC (Society of Environmental Toxicology and Chemistry): SETAC Life Cycle Assessment SPOLD (Society for Promotion of Life-cycle Assessment Development): 2.0 LCA Consultants homepage

294

Thermal energy conversion to motive power  

SciTech Connect

Performance evaluations of both ideal and actual organic Rankine cycle (ORC) and steam Rankine cycles (SRC) are presented for systems that may be candidates for Solar Total Energy Systems (STES). Many organic fluids and heat engines (turbines or expanders) are being developed; therefore, performance of a few representative ORCs are evaluated. The electrical power outputs range from several kW to <10 MW with maximum cycle temperatures of 482/sup 0/C (900 F). Conclusions from basic Rankine cycle analyses are that the Carnot cycle concept should not be used as a standard of comparison for different cycle fluids, even when they are operating at the same inlet and exhaust temperatures. The ideal Rankine cycle with the maximum conversion efficiency, when based on exact physical properties of fluids, should provide a better standard for actual cycles. Three sets of maximum (ideal) Rankine cycle efficiency (n/sub r/) curves are estimated for steam and several organic fluids for exhaust temperatures of 38/sup 0/C, 100/sup 0/C, and 149/sup 0/C (100 F, 212 F, and 300F). These curves of n/sub r/ versus peak temperature at the expander inlet are referred to as Criterion Curves for basic Rankine cycles, in which corresponding inlet pressures are selected such that n/sub r/ will be a maximum. Basic cycle efficiencies indicate some fluids preferred for solar total energy applications.

Meador, J.T.

1980-01-01T23:59:59.000Z

295

Evaluation of Indirect Combined Cycle in Very High Temperature Gas--Cooled Reactor  

SciTech Connect

The U.S. Department of Energy and Idaho National Laboratory are developing a very high temperature reactor to serve as a demonstration of state-of-the-art nuclear technology. The purpose of the demonstration is twofold: (a) efficient, low-cost energy generation and (b) hydrogen production. Although a next-generation plant could be developed as a single-purpose facility, early designs are expected to be dual purpose, as assumed here. A dual-purpose design with a combined cycle of a Brayton top cycle and a bottom Rankine cycle was investigated. An intermediate heat transport loop for transporting heat to a hydrogen production plant was used. Helium, CO2, and a helium-nitrogen mixture were studied to determine the best working fluid in terms of the cycle efficiency. The relative component sizes were estimated for the different working fluids to provide an indication of the relative capital costs. The relative size of the turbomachinery was measured by comparing the power input/output of the component. For heat exchangers the volume was computed and compared. Parametric studies away from the baseline values of the cycle were performed to determine the effects of varying conditions in the cycle. This gives some insight into the sensitivity of the cycle to various operating conditions as well as trade-offs between efficiency and component size. Parametric studies were carried out on reactor outlet temperature, mass flow, pressure, and turbine cooling.

Chang Oh; Robert Barner; Cliff Davis; Steven Sherman; Paul Pickard

2006-10-01T23:59:59.000Z

296

Encouraging Combined Heat and Power in California Buildings  

E-Print Network (OSTI)

incentive ($/W) wind turbine waste heat to power pressurewind turbines, fuel cells, organic rankine cycle/waste heat capture, pressure reduction turbines, advanced energy storage, and combined heat and power

Stadler, Michael

2014-01-01T23:59:59.000Z

297

Low Level Heat Recovery Technology  

E-Print Network (OSTI)

level heat recovery technology. This paper discusses heat distribution systems, latest developments in absorption refrigeration and organic Rankine cycles, and pressure, minimization possibilities. The relative merits and economics of the various...

O'Brien, W. J.

1982-01-01T23:59:59.000Z

298

Value analysis of advanced heat rejection systems for geothermal power plants  

SciTech Connect

A computer model is developed to evaluate the performance of the binary geothermal power plants (Organic Rankine Cycles) with various heat rejection systems and their impact on the levelized cost of electricity. The computer model developed in this work is capable of simulating the operation of a geothermal power plant which consists mainly of an Organic Rankine Cycle (binary plants) with different types of working fluids such as pure hydrocarbons and some binary mixtures of the most promising combinations of hydrocarbons.

Bliem, C. [CJB Consulting, Longmont, CO (United States); Zangrando, F.; Hassani, V. [National Renewable Energy Lab., Golden, CO (United States)

1996-04-10T23:59:59.000Z

299

Development of advanced off-design models for supercritical carbon dioxide power cycles  

SciTech Connect

In the search for increased efficiency of utility-scale electricity generation, Brayton cycles operating with supercritical carbon dioxide (S-CO{sub 2}) have found considerable interest. There are two main advantages of a S-CO{sub 2} Brayton cycle compared to a Rankine cycle: 1) equal or greater thermal efficiencies can be realized using significantly smaller turbomachinery, and 2) heat rejection is not limited by the saturation temperature of the working fluid, which has the potential to reduce or completely eliminate the need for cooling water and instead allow dry cooling. While dry cooling is especially advantageous for power generation in arid climates, a reduction of water consumption in any location will be increasingly beneficial as tighter environmental regulations are enacted in the future. Because daily and seasonal weather variations may result in a plant operating away from its design point, models that are capable of predicting the off-design performance of S-CO{sub 2} power cycles are necessary for characterizing and evaluating cycle configurations and turbomachinery designs on an annual basis. To this end, an off-design model of a recuperated Brayton cycle was developed based on the radial turbomachinery currently being investigated by Sandia National Laboratory. (authors)

Dyreby, J. J.; Klein, S. A.; Nellis, G. F.; Reindl, D. T. [Univ. of Wisconsin-Madison, Solar Energy Laboratory, 1343 Engineering Research Building, 1500 Engineering Drive, Madison, WI 53706 (United States)

2012-07-01T23:59:59.000Z

300

Making Use of Low-Level Heat  

E-Print Network (OSTI)

to discuss today ~s This method is based on the organic Rankine c~cle power, either electrical or mechanical power. using a suitable working fluid in a closed loop. . 11 t pressure, adds heat ito To refresh your memory, the Rankine cycle pumps liquid... electric power, by the organic Rankine cycle mechanism. A~I I Energy Systems is a company set up by Allied Chemical and Ishikawajima-Harima Heavy Industri~s i Co. of Japan to design and sell the IHI System, operating mainly with freon fluids. i i f I...

Plaster, W. E.

1979-01-01T23:59:59.000Z

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


301

Expeditious Data Center Sustainability, Flow, and Temperature Modeling: Life-Cycle Exergy Consumption Combined with a Potential Flow Based, Rankine Vortex Superposed, Predictive Method.  

E-Print Network (OSTI)

??Traditionally data centers were designed with reliability, functionality, and up front cost as the primary design drivers, with secondary consideration given to cost of operation… (more)

Lettieri, David

2012-01-01T23:59:59.000Z

302

Expeditious Data Center Sustainability, Flow, and Temperature Modeling: Life-Cycle Exergy Consumption Combined with a Potential Flow Based, Rankine Vortex Superposed, Predictive Method  

E-Print Network (OSTI)

can affect all three pillars of sustainability. For example,three pillars, often also referred to as the triple bottom line [23], categorize sustainabilitysustainability indicators have been defined and used, and are grouped into what the report labels three “pillars”.

Lettieri, David

2012-01-01T23:59:59.000Z

303

Expeditious Data Center Sustainability, Flow, and Temperature Modeling: Life-Cycle Exergy Consumption Combined with a Potential Flow Based, Rankine Vortex Superposed, Predictive Method  

E-Print Network (OSTI)

Coal Natural Gas Percentage of California PG & E Electricity Mix Electricity Generation The global warming

Lettieri, David

2012-01-01T23:59:59.000Z

304

Cycle Track Lessons Learned  

E-Print Network (OSTI)

Cycle Track Lessons Learned #12;Presentation Overview · Bicycling trends · Cycle track lessons learned · What is a "Cycle track"? · Essential design elements of cycle tracks Separation Width Crossing driveways & low-volume streets Signalized intersections #12;Trend in kilometers cycled per year

Bertini, Robert L.

305

Photovoltaics Life Cycle Analysis  

E-Print Network (OSTI)

Metrics of Life-Cycle Performance Energy Payback Times (EPBT) Greenhouse Gas Emissions (GHG) Toxic Gases #12;6 Life Cycle GHG Emissions ­EuropeLife Cycle GHG Emissions ­Europe Insolation: 1700 kwh/m2-yr 0 10 #12;7 Life Cycle GHG Emissions ­Comparison with Conventional Technologies Life Cycle GHG Emissions

306

Optimization of Air Conditioning Cycling  

E-Print Network (OSTI)

Benchmark – Long Cycle .............................................................................................. 95 5.46 System Pressures and Temperatures – Valve Part Cycle Vs Benchmark – Long Cycle...

Seshadri, Swarooph

2012-10-19T23:59:59.000Z

307

Performance improvement options for the supercritical carbon dioxide brayton cycle.  

SciTech Connect

The supercritical carbon dioxide (S-CO{sub 2}) Brayton cycle is under development at Argonne National Laboratory as an advanced power conversion technology for Sodium-Cooled Fast Reactors (SFRs) as well as other Generation IV advanced reactors as an alternative to the traditional Rankine steam cycle. For SFRs, the S-CO{sub 2} Brayton cycle eliminates the need to consider sodium-water reactions in the licensing and safety evaluation, reduces the capital cost of the SFR plant, and increases the SFR plant efficiency. Even though the S-CO{sub 2} cycle has been under development for some time and optimal sets of operating parameters have been determined, those earlier development and optimization studies have largely been directed at applications to other systems such as gas-cooled reactors which have higher operating temperatures than SFRs. In addition, little analysis has been carried out to investigate cycle configurations deviating from the selected 'recompression' S-CO{sub 2} cycle configuration. In this work, several possible ways to improve S-CO{sub 2} cycle performance for SFR applications have been identified and analyzed. One set of options incorporates optimization approaches investigated previously, such as variations in the maximum and minimum cycle pressure and minimum cycle temperature, as well as a tradeoff between the component sizes and the cycle performance. In addition, the present investigation also covers options which have received little or no attention in the previous studies. Specific options include a 'multiple-recompression' cycle configuration, intercooling and reheating, as well as liquid-phase CO{sub 2} compression (pumping) either by CO{sub 2} condensation or by a direct transition from the supercritical to the liquid phase. Some of the options considered did not improve the cycle efficiency as could be anticipated beforehand. Those options include: a double recompression cycle, intercooling between the compressor stages, and reheating between the turbine stages. Analyses carried out as part of the current investigation confirm the possibilities of improving the cycle efficiency that have been identified in previous investigations. The options in this group include: increasing the heat exchanger and turbomachinery sizes, raising of the cycle high end pressure (although the improvement potential of this option is very limited), and optimization of the low end temperature and/or pressure to operate as close to the (pseudo) critical point as possible. Analyses carried out for the present investigation show that significant cycle performance improvement can sometimes be realized if the cycle operates below the critical temperature at its low end. Such operation, however, requires the availability of a heat sink with a temperature lower than 30 C for which applicability of this configuration is dependent upon the climate conditions where the plant is constructed (i.e., potential performance improvements are site specific). Overall, it is shown that the S-CO{sub 2} Brayton cycle efficiency can potentially be increased to 45 %, if a low temperature heat sink is available and incorporation of larger components (e.g.., heat exchangers or turbomachinery) having greater component efficiencies does not significantly increase the overall plant cost.

Moisseytsev, A.; Sienicki, J. J.; Nuclear Engineering Division

2008-07-17T23:59:59.000Z

308

Analysis of a new thermodynamic cycle for combined power and cooling using low and mid temperature solar collectors  

SciTech Connect

A combined thermal power and cooling cycle is proposed which combines the Rankine and absorption refrigeration cycles. It can provide power output as well as refrigeration with power generation as a primary goal. Ammonia-water mixture is used as a working fluid. The boiling temperature of the ammonia-water mixture increases as the boiling process proceeds until all liquid is vaporized, so that a better thermal match is obtained in the boiler. The proposed cycle takes advantage of the low boiling temperature of ammonia vapor so that it can be expanded to a low temperature while it is still in a vapor state or a high quality two phase state. This cycle is ideally suited for solar thermal power using low cost concentrating collectors, with the potential to reduce the capital cost of a solar thermal power plant. The cycle can also be used as a bottoming cycle for any thermal power plant. This paper presents a parametric analysis of the proposed cycle.

Goswami, D.Y.; Xu, F. [Univ. of Florida, Gainesville, FL (United States). Solar Energy and Energy Conversion Lab.

1999-05-01T23:59:59.000Z

309

Electricity generation from coal with CO2 capture by means of a novel power cycle  

SciTech Connect

Climate modelers have estimated that anthropogenic emissions of CO2 must be reduced substantially from the present rate to stabilize atmospheric concentration. To achieve this, electricity generation from fossil fuels with CO2 capture and direct sequestration may play an important role. If so, it will be worthwhile to consider power cycles that are designed to minimize atmospheric CO2 emissions and deliver CO2 ready for pipeline transport in addition to providing other desirable attributes of environmental performance and efficiency. One such novel approach, named the Matiant cycle, employs self generated CO2 as the working fluid with both Bryton and Rankine cycle turbines. Process modeling studies are being conducted at the NETL to investigate the promise of this cycle. In the work to be reported, synthesis gas is provided to the Matiant cycle by oxygen-blown dry coal entrained gasification. Oxygen for both the gasifier and the Matiant cycle is provided by use of an Ion Transport Membrane (ITM). ITM is a revolutionary approach for producing high purity oxygen from a high temperature pressurized air stream. ASPEC Plus is used as the simulation tool to compute energy balances and system performance. Two flowsheets are analyzed, the difference being the treatment of the low oxygen content raffinate stream from the ITM. Computed thermal efficiencies of the ITM/Matiant cycle are comparable to those of conventional IGCC without carbon capture. Specific carbon emissions per net MWh are many times lower for the new cycle than for other approaches being developed for power generation with CO2 capture, however. As much as 99.5% of the carbon in synthesis gas fed to the Matiant cycle could be recovered and removed in a pipeline as a high pressure liquid. Such high capture efficiencies at large central generating stations could allow use of fossil fuels without capture at smaller installations or by mobile sources, yielding a modest overall rate of CO2 emissions.

Ruether, J.; Le, P.; White, C.

2000-07-01T23:59:59.000Z

310

Author's personal copy Pyroelectric waste heat energy harvesting using heat conduction  

E-Print Network (OSTI)

pump, cryogenic refrigeration, and air liquefaction applications [3]. Organic Rankine cycles use heat harvesting Olsen cycle a b s t r a c t Waste heat can be directly converted into electrical energy by performing the Olsen cycle on pyroelectric materials. The Olsen cycle consists of two isothermal and two

Pilon, Laurent

311

This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research  

E-Print Network (OSTI)

]. Unfortunately, small Carnot efficiencies have hindered the development of such devices. Organic Rankine cycles Pyroelectric energy Heat recovery Ferroelectric materials Oscillating flow Olsen cycle Ericsson cycle made of co-polymer P(VDF-TrFE) and undergoing the Olsen cycle. A piston was used to vertically

Pilon, Laurent

312

MHK Technologies/Closed Cycle OTEC | Open Energy Information  

Open Energy Info (EERE)

Closed Cycle OTEC Closed Cycle OTEC < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Closed Cycle OTEC.jpg Technology Profile Primary Organization Marine Development Associates Inc Technology Resource Click here OTEC Technology Type Click here OTEC - Closed Cycle Technology Description Closed Cycle System Technology Dimensions Device Testing Date Submitted 02:50.8 << Return to the MHK database homepage Retrieved from "http://en.openei.org/w/index.php?title=MHK_Technologies/Closed_Cycle_OTEC&oldid=681555" Category: Marine and Hydrokinetic Technologies What links here Related changes Special pages Printable version Permanent link Browse properties 429 Throttled (bot load) Error 429 Throttled (bot load) Throttled (bot load)

313

Optimization of Fog Inlet Air Cooling System for Combined Cycle Power Plants using Genetic Algorithm  

Science Journals Connector (OSTI)

Abstract In this research paper, a comprehensive thermodynamic modeling of a combined cycle power plant is first conducted and the effects of gas turbine inlet fogging system on the first and second law efficiencies and net power outputs of combined cycle power plants are investigated. The combined cycle power plant (CCPP) considered for this study consist of a double pressure heat recovery steam generator (HRSG) to utilize the energy of exhaust leaving the gas turbine and produce superheated steam to generate electricity in the Rankine cycle. In order to enhance understanding of this research and come up with optimum performance assessment of the plant, a complete optimization is using a genetic algorithm conducted. In order to achieve this goal, a new objective function is defined for the system optimization including social cost of air pollution for the power generation systems. The objective function is based on the first law efficiency, energy cost and the external social cost of air pollution for an operational system. It is concluded that using inlet air cooling system for the CCPP system and its optimization results in an increase in the average output power, first and second law efficiencies by 17.24%, 3.6% and 3.5%, respectively, for three warm months of year.

Mehdi A. Ehyaei; Mojtaba Tahani; Pouria Ahmadi; M. Esfandiari

2014-01-01T23:59:59.000Z

314

Use of Multiple Reheat Helium Brayton Cycles to Eliminate the Intermediate Heat Transfer Loop for Advanced Loop Type SFRs  

SciTech Connect

The sodium intermediate heat transfer loop is used in existing sodium cooled fast reactor (SFR) plant design as a necessary safety measure to separate the radioactive primary loop sodium from the water of the steam Rankine power cycle. However, the intermediate heat transfer loop significantly increases the SFR plant cost and decreases the plant reliability due to the relatively high possibility of sodium leakage. A previous study shows that helium Brayton cycles with multiple reheat and intercooling for SFRs with reactor outlet temperature in the range of 510°C to 650°C can achieve thermal efficiencies comparable to or higher than steam cycles or recently proposed supercritical CO2 cycles. Use of inert helium as the power conversion working fluid provides major advantages over steam or CO2 by removing the requirement for safety systems to prevent and mitigate the sodium-water or sodium-CO2 reactions. A helium Brayton cycle power conversion system therefore makes the elimination of the intermediate heat transfer loop possible. This paper presents a pre-conceptual design of multiple reheat helium Brayton cycle for an advanced loop type SFR. This design widely refers the new horizontal shaft distributed PBMR helium power conversion design features. For a loop type SFR with reactor outlet temperature 550°C, the design achieves 42.4% thermal efficiency with favorable power density comparing with high temperature gas cooled reactors.

Haihua Zhao; Hongbin Zhang; Samuel E. Bays

2009-05-01T23:59:59.000Z

315

In-space power rejection management via indirect annular flow liquid film management - process design and feasibility  

E-Print Network (OSTI)

scoping calculations for a supercritical organic Rankine cycle experiment that uses the SLIC process as its condenser and is geometrically constrained to the dimensions of a NASA GAS container. The SLIC Steady-State Mathematical Model chapter... of the SLIC to maintain the design energy balance of the experiment. The experiment (approximately 28 kg) was a supercritical organic Rankine engine operating between 500 and 400 Kelvin at a mass flow of 1 gram per second; using R-113 as the working fluid...

Williams, Rube Ben

2012-06-07T23:59:59.000Z

316

Cogeneration from glass furnace waste heat recovery  

SciTech Connect

In glass manufacturing 70% of the total energy utilized is consumed in the melting process. Three basic furnaces are in use: regenerative, recuperative, and direct fired design. The present paper focuses on secondary heat recovery from regenerative furnaces. A diagram of a typical regenerative furnace is given. Three recovery bottoming cycles were evaluated as part of a comparative systems analysis: steam Rankine Cycle (SRC), Organic Rankine Cycle (ORC), and pressurized Brayton cycle. Each cycle is defined and schematicized. The net power capabilities of the three different systems are summarized. Cost comparisons and payback period comparisons are made. Organic Rankine cycle provides the best opportunity for cogeneration for all the flue gas mass flow rates considered. With high temperatures, the Brayton cycle has the shortest payback period potential, but site-specific economics need to be considered.

Hnat, J.G.; Cutting, J.C.; Patten, J.S.

1982-06-01T23:59:59.000Z

317

Quantifying Carbon Cycle Feedbacks  

Science Journals Connector (OSTI)

Perturbations to the carbon cycle could constitute large feedbacks on future changes in atmospheric CO2 concentration and climate. This paper demonstrates how carbon cycle feedback can be expressed in formally similar ways to climate feedback, ...

J. M. Gregory; C. D. Jones; P. Cadule; P. Friedlingstein

2009-10-01T23:59:59.000Z

318

Edgeworth cycles revisited  

E-Print Network (OSTI)

Some gasoline markets exhibit remarkable price cycles, where price spikes are followed by a series of small price declines: a pattern consistent with a model of Edgeworth cycles described by Maskin and Tirole. We extend ...

Doyle, Joseph J.

319

The combined cycle  

Science Journals Connector (OSTI)

Any combination of at least two cyclic processes converting thermal energy (‘heat’) to work forms a combined cycle. In principle, the potential number of ... number of options reduces to a variety of cycles consi...

R. U. Pitt

1995-01-01T23:59:59.000Z

320

Water Cycle Pilot Study  

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

1 Water Cycle Pilot Study To learn more about Earth's water cycle, the U.S. Department of Energy (DOE) has established a multi-laboratory science team representing five DOE...

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


321

mathematics single cycle  

E-Print Network (OSTI)

47 mathematics education single cycle master's study programme #12;48 single cycle master's study program in Mathematics Education #12;49 single cycle master's study program in Mathematics Education MATHEMATICS EDUCATION The program is in tune with the principles of the Bologna Declaration. · Academic title

Â?umer, Slobodan

322

Julian Ly Davis, Ph.D. 315 Engineering Lab  

E-Print Network (OSTI)

, Virginia Tech, Thesis: Design of a Smart Fluid Rankine Cycle, Advisor: Mark S. Cramer TEACHING 2008

Dumont, Elizabeth R.

323

Biomass Gasification Combined Cycle  

SciTech Connect

Gasification combined cycle continues to represent an important defining technology area for the forest products industry. The ''Forest Products Gasification Initiative'', organized under the Industry's Agenda 2020 technology vision and supported by the DOE ''Industries of the Future'' program, is well positioned to guide these technologies to commercial success within a five-to ten-year timeframe given supportive federal budgets and public policy. Commercial success will result in significant environmental and renewable energy goals that are shared by the Industry and the Nation. The Battelle/FERCO LIVG technology, which is the technology of choice for the application reported here, remains of high interest due to characteristics that make it well suited for integration with the infrastructure of a pulp production facility. The capital cost, operating economics and long-term demonstration of this technology area key input to future economically sustainable projects and must be verified by the 200 BDT/day demonstration facility currently operating in Burlington, Vermont. The New Bern application that was the initial objective of this project is not currently economically viable and will not be implemented at this time due to several changes at and around the mill which have occurred since the inception of the project in 1995. The analysis shows that for this technology, and likely other gasification technologies as well, the first few installations will require unique circumstances, or supportive public policies, or both to attract host sites and investors.

Judith A. Kieffer

2000-07-01T23:59:59.000Z

324

Cycle to Cycle Manufacturing Process Control  

E-Print Network (OSTI)

Most manufacturing processes produce parts that can only be correctly measured after the process cycle has been completed. Even if in-process measurement and control is possible, it is often too expensive or complex to ...

Hardt, David E.

325

Design and evaluation of a nuclear-electric hybrid power/propulsion system  

E-Print Network (OSTI)

INTRODUCTION Page Motivation Literature Search Contributions. . . . . . . Organization of the Thesis II SYSTEM DESCRIPTION AND MODELING Conventional Cycles Hybrid Cycle Cycle Components System Integration 6 10 10 29 III TRAJECTORY MODEL . 33 IV... investigating and comparing various closed and open cycles. El ? Genk et al. ' have investiga, ted three different cycles: A potassium Rankine cycle, a. closed and an open Brayton cycle. These systems v'ere optimized for a power level of 160 MWe and compared...

Keil, Ralph

2012-06-07T23:59:59.000Z

326

VISION - Verifiable Fuel Cycle Simulation of Nuclear Fuel Cycle Dynamics  

SciTech Connect

The U.S. DOE Advanced Fuel Cycle Initiative’s (AFCI) fundamental objective is to provide technology options that - if implemented - would enable long-term growth of nuclear power while improving sustainability and energy security. The AFCI organization structure consists of four areas; Systems Analysis, Fuels, Separations and Transmutations. The Systems Analysis Working Group is tasked with bridging the program technical areas and providing the models, tools, and analyses required to assess the feasibility of design and deployment options and inform key decision makers. An integral part of the Systems Analysis tool set is the development of a system level model that can be used to examine the implications of the different mixes of reactors, implications of fuel reprocessing, impact of deployment technologies, as well as potential "exit" or "off ramp" approaches to phase out technologies, waste management issues and long-term repository needs. The Verifiable Fuel Cycle Simulation Model (VISION) is a computer-based simulation model that allows performing dynamic simulations of fuel cycles to quantify infrastructure requirements and identify key trade-offs between alternatives. It is based on the current AFCI system analysis tool "DYMOND-US" functionalities in addition to economics, isotopic decay, and other new functionalities. VISION is intended to serve as a broad systems analysis and study tool applicable to work conducted as part of the AFCI and Generation IV reactor development studies.

Steven J. Piet; A. M. Yacout; J. J. Jacobson; C. Laws; G. E. Matthern; D. E. Shropshire

2006-02-01T23:59:59.000Z

327

MST: Organizations: Organic Materials  

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

Adhesive Bonding Adhesive Bonding Composites Encapsulation Materials Characterization Mechanical Testing Molding, Thermoforming, & Compounding Organizations Organic Materials Composite-to-metal adhesive bond Experimental/analytical study of composit-to-metal adhesive bond. The Organic Materials department in the Advanced Manufacturing and Processing Laboratory provides innovative prototype fabrication, full service small lot production, materials technology, processing expertise, and a broad range of organic material characterization and mechanical testing techniques. We encapsulate, we join and bond, we foam, we analyze and image, we build composite structures. We strive to make you, our customers, successful! We partner with you to find the right combination of materials, processing, and fixturing that will result in the highest value

328

Organic Vegetable Organic Vegetable  

E-Print Network (OSTI)

marketed separately from conventionally grown produce in order to be profitably sold. Because of the amount of organic material include compost, Purdue University · Cooperative Extension Service · Knowledge to Go

329

Nutrient Management Module No. 3 Nitrogen Cycling,  

E-Print Network (OSTI)

, it is important to first understand the various transformations that N undergoes within the soil. Nitrogen Cycling to be the sum of ammonium and nitrate, although urea, a type of organic N, may also be plant available. Nitrogen a fraction) by dry yield (in lb/ac). It's useful to compare actual uptake rates to N fertilizer rates

Lawrence, Rick L.

330

Energy Conversion Advanced Heat Transport Loop and Power Cycle  

SciTech Connect

The Department of Energy and the Idaho National Laboratory are developing a Next Generation Nuclear Plant (NGNP) to serve as a demonstration of state-of-the-art nuclear technology. The purpose of the demonstration is two fold 1) efficient low cost energy generation and 2) hydrogen production. Although a next generation plant could be developed as a single-purpose facility, early designs are expected to be dual-purpose. While hydrogen production and advanced energy cycles are still in its early stages of development, research towards coupling a high temperature reactor, electrical generation and hydrogen production is under way. Many aspects of the NGNP must be researched and developed in order to make recommendations on the final design of the plant. Parameters such as working conditions, cycle components, working fluids, and power conversion unit configurations must be understood. Three configurations of the power conversion unit were demonstrated in this study. A three-shaft design with 3 turbines and 4 compressors, a combined cycle with a Brayton top cycle and a Rankine bottoming cycle, and a reheated cycle with 3 stages of reheat were investigated. An intermediate heat transport loop for transporting process heat to a High Temperature Steam Electrolysis (HTSE) hydrogen production plant was used. Helium, CO2, and an 80% nitrogen, 20% helium mixture (by weight) were studied to determine the best working fluid in terms cycle efficiency and development cost. In each of these configurations the relative component size were estimated for the different working fluids. The relative size of the turbomachinery was measured by comparing the power input/output of the component. For heat exchangers the volume was computed and compared. Parametric studies away from the baseline values of the three-shaft and combined cycles were performed to determine the effect of varying conditions in the cycle. This gives some insight into the sensitivity of these cycles to various operating conditions as well as trade offs between efficiency and capital cost. Prametric studies were carried out on reactor outlet temperature, mass flow, pressure, and turbine cooling. Recommendations on the optimal working fluid for each configuration were made. A steady state model comparison was made with a Closed Brayton Cycle (CBC) power conversion system developed at Sandia National Laboratory (SNL). A preliminary model of the CBC was developed in HYSYS for comparison. Temperature and pressure ratio curves for the Capstone turbine and compressor developed at SNL were implemented into the HYSYS model. A comparison between the HYSYS model and SNL loop demonstrated power output predicted by HYSYS was much larger than that in the experiment. This was due to a lack of a model for the electrical alternator which was used to measure the power from the SNL loop. Further comparisons of the HYSYS model and the CBC data are recommended. Engineering analyses were performed for several configurations of the intermediate heat transport loop that transfers heat from the nuclear reactor to the hydrogen production plant. The analyses evaluated parallel and concentric piping arrangements and two different working fluids, including helium and a liquid salt. The thermal-hydraulic analyses determined the size and insulation requirements for the hot and cold leg pipes in the different configurations. Economic analyses were performed to estimate the cost of the va

Oh, C. H.

2006-08-01T23:59:59.000Z

331

MHK Technologies/Kalina Cycle OTEC | Open Energy Information  

Open Energy Info (EERE)

Kalina Cycle OTEC Kalina Cycle OTEC < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Kalina Cycle OTEC.jpg Technology Profile Primary Organization Ocean Engineering and Energy Systems Technology Resource Click here OTEC Technology Type Click here OTEC - Closed Cycle Technology Description Kalina Cycle The Kalina Cycle is a variation of the more conventional closed cycle OTEC system incorporating aqueous ammonia ammonia water mixture as the working fluid instead of the conventional ammonia or propylene working fluid employed in earlier designs of closed cycle OTEC power systems The Kalina Cycle is a break through technology for OTEC power systems providing a nearly 80 increase in efficiency over previous closed cycle designs Because the ammonia water concentrations can be varied throughout the system to optimize according to system temperatures sort of a designer working fluid and by adding an extra component the recuperator heat losses generally experienced in other closed cycle designs can be minimized and recovered thereby improving the overall efficiency of the power cycle

332

Power Plant Cycling Costs  

SciTech Connect

This report provides a detailed review of the most up to date data available on power plant cycling costs. The primary objective of this report is to increase awareness of power plant cycling cost, the use of these costs in renewable integration studies and to stimulate debate between policymakers, system dispatchers, plant personnel and power utilities.

Kumar, N.; Besuner, P.; Lefton, S.; Agan, D.; Hilleman, D.

2012-07-01T23:59:59.000Z

333

Life Cycle Cost Estimate  

Directives, Delegations, and Requirements

Life-cycle costs (LCCs) are all the anticipated costs associated with a project or program alternative throughout its life. This includes costs from pre-operations through operations or to the end of the alternative.This chapter discusses life cycle costs and the role they play in planning.

1997-03-28T23:59:59.000Z

334

POWER CYCLE AND STRESS ANALYSES FOR HIGH TEMPERATURE GAS-COOLED REACTOR  

SciTech Connect

The Department of Energy and the Idaho National Laboratory are developing a Next Generation Nuclear Plant (NGNP) to serve as a demonstration of state-of-the-art nuclear technology. The purpose of the demonstration is two fold 1) efficient low cost energy generation and 2) hydrogen production. Although a next generation plant could be developed as a single-purpose facility, early designs are expected to be dual-purpose. While hydrogen production and advanced energy cycles are still in its early stages of development, research towards coupling a high temperature reactor, electrical generation and hydrogen production is under way. Many aspects of the NGNP must be researched and developed in order to make recommendations on the final design of the plant. Parameters such as working conditions, cycle components, working fluids, and power conversion unit configurations must be understood. Three configurations of the power conversion unit were demonstrated in this study. A three-shaft design with three turbines and four compressors, a combined cycle with a Brayton top cycle and a Rankine bottoming cycle, and a reheated cycle with three stages of reheat were investigated. An intermediate heat transport loop for transporting process heat to a High Temperature Steam Electrolysis (HTSE) hydrogen production plant was used. Helium, CO2, and a 80% nitrogen, 20% helium mixture (by weight) were studied to determine the best working fluid in terms cycle efficiency and development cost. In each of these configurations the relative component size were estimated for the different working fluids. The relative size of the turbomachinery was measured by comparing the power input/output of the component. For heat exchangers the volume was computed and compared. Parametric studies away from the baseline values of the three-shaft and combined cycles were performed to determine the effect of varying conditions in the cycle. This gives some insight into the sensitivity of these cycles to various operating conditions as well as trade offs between efficiency and capital cost. Parametric studies were carried out on reactor outlet temperature, mass flow, pressure, and turbine cooling. Recommendations on the optimal working fluid for each configuration were made. Engineering analyses were performed for several configurations of the intermediate heat transport loop that transfers heat from the nuclear reactor to the hydrogen production plant. The analyses evaluated parallel and concentric piping arrangements and two different working fluids, including helium and a liquid salt. The thermal-hydraulic analyses determined the size and insulation requirements for the hot and cold leg pipes in the different configurations. Mechanical analyses were performed to determine hoop stresses and thermal expansion characteristics for the different configurations. Economic analyses were performed to estimate the cost of the various configurations.

Oh, Chang H; Davis, Cliff; Hawkes, Brian D; Sherman, Steven R

2007-05-01T23:59:59.000Z

335

High-efficiency solar dynamic space power generation system  

SciTech Connect

Space power technologies have undergone significant advances over the past few years, and great emphasis is being placed on the development of dynamic power systems at this time. A design study has been conducted to evaluate the applicability of a combined cycle concept-closed Brayton cycle and organic Rankine cycle coupling-for solar dynamic space power generation systems. In the concept presented in this paper (solar dynamic combined cycle), the waste heat rejected by the closed Brayton cycle working fluid is utilized to heat the organic working fluid of an organic Rankine cycle system. This allows the solar dynamic combined cycle efficiency to be increased compared to the efficiencies of two subsystems (closed Brayton cycle and organic fluid cycle). Also, for small-size space power systems (up to 50 kW), the efficiency of the solar dynamic combined cycle can be comparable with Stirling engine performance. The closed Brayton cycle and organic Rankine cycle designs are based on a great deal of maturity assessed in much previous work on terrestrial and solar dynamic power systems. This is not yet true for the Stirling cycles. The purpose of this paper is to analyze the performance of the new space power generation system (solar dynamic combined cycle). The significant benefits of the solar dynamic combined cycle concept such as efficiency increase, mass reduction, specific area-collector and radiator-reduction, are presented and discussed for a low earth orbit space station application.

Massardo, A. (Dept. di Ingegneria Energetica, Univ. di Genova, 16145 Genova (IT))

1991-08-01T23:59:59.000Z

336

Energy Conservation and Management for Electric Utility Industrial Customers  

E-Print Network (OSTI)

Figure 5 Steam/Organic Fluid Rankine-Cycle Power System Absorption Cooling Systems The absorpt i on cool i ng system mode 1ed for the EC&M computer mode 1 is a type of heat pump whd ch is driven directly by a thermal input without th~ need for a...&M Applications Identified from Plant Data EC&M Technology ? Heat Exchangers ? Waste heat boiler ? Rankine cycle ? Heat pump --Closed cycle --Open cycle ? Thermal energy storage ? GT/electric generator/chiller Industrial Application Process...

McChesney, H. R.; Obee, T. N.; Mangum, G. F.

337

DOE Hydrogen Analysis Repository: Life Cycle Assessment of Hydrogen Fuel  

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

Life Cycle Assessment of Hydrogen Fuel Cell and Gasoline Vehicles Life Cycle Assessment of Hydrogen Fuel Cell and Gasoline Vehicles Project Summary Full Title: Life Cycle Assessment of Hydrogen Fuel Cell and Gasoline Vehicles Project ID: 143 Principal Investigator: Ibrahim Dincer Brief Description: Examines the social, environmental and economic impacts of hydrogen fuel cell and gasoline vehicles. Purpose This project aims to investigate fuel cell vehicles through environmental impact, life cycle assessment, sustainability, and thermodynamic analyses. The project will assist in the development of highly qualified personnel in such areas as system analysis, modeling, methodology development, and applications. Performer Principal Investigator: Ibrahim Dincer Organization: University of Ontario Institute of Technology

338

Science Organizations  

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

Organizations Science Organizations National security depends on science and technology. The United States relies on Los Alamos National Laboratory for the best of both. No place...

339

The Carbon Cycle  

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

The Carbon Cycle The Carbon Cycle The global carbon cycle involves the carbon in and exchanging between the earth's atmosphere, fossil fuels, the oceans, and the vegetation and soils of the earth's terrestrial ecosystems. image Each year, the world's terrestrial ecosystems withdraw carbon from the atmosphere through photosynthesis and add it again through respiration and decay. A more detailed look at the global carbon cycle for the 1990s is shown below. The main annual fluxes in GtC yr-1 are: pre-industrial "natural" fluxes in black and "anthropogenic" fluxes in red (modified from Sarmiento and Gruber, 2006, with changes in pool sizes from Sabine et al., 2004a). The net terrestrial loss of -39 GtC is inferred from cumulative fossil fuel emissions minus atmospheric increase minus ocean storage. The loss of

340

Wetland (peat) Carbon Cycle  

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

Wetland (peat) Carbon Cycle Methane (CH4) is an important greenhouse gas, twenty times more potent than CO2, but atmospheric concentrations of CH4 under future climate change are...

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


341

IFR fuel cycle  

SciTech Connect

The next major milestone of the IFR program is engineering-scale demonstration of the pyroprocess fuel cycle. The EBR-II Fuel Cycle Facility has just entered a startup phase, which includes completion of facility modifications and installation and cold checkout of process equipment. This paper reviews the development of the electrorefining pyroprocess, the design and construction of the facility for the hot demonstration, the design and fabrication of the equipment, and the schedule and initial plan for its operation.

Battles, J.E.; Miller, W.E. [Argonne National Lab., IL (United States); Lineberry, M.J.; Phipps, R.D. [Argonne National Lab., Idaho Falls, ID (United States)

1992-04-01T23:59:59.000Z

342

Malone cycle refrigerator development  

SciTech Connect

This paper describes the progress made in demonstrating a Malone Cycle Refrigerator/Freezer. The Malone cycle is similar to the Stirling cycle but uses a supercritical fluid in place of real gas. In the approach, solid-metal diaphragms are used to seal and sweep the working volumes against the high working fluid pressures required in Malone cycle machines. This feature eliminates the friction and leakage that accounted for nearly half the losses in the best piston-defined Malone cycle machines built to date. The authors successfully built a Malone cycle refrigerator that: (1) used CO{sub 2} as the working fluid, (2) operated at pressures up to 19.3 Mpa (2,800 psi), (3) achieved a cold end metal temperatures of {minus}29 C ({minus}20 F), and (4) produced over 400 Watts of cooling at near ambient temperatures. The critical diaphragm components operated flawlessly throughout characterization and performance testing, supporting the conclusion of high reliability based on analysis of fatigue date and actual strain measurements.

Shimko, M.A.; Crowley, C.J.

1999-07-01T23:59:59.000Z

343

An algorithm for a decomposition of weighted digraphs --with applications to life cycle analysis in ecology  

E-Print Network (OSTI)

in ecology L. Sun M. Wang § Abstract In the analysis of organism life cycles in ecology, comparisons of life the decomposition was formalized by Wardle [Ecology 79(7), 2539-2549 (1998)]. However there are difficulties no such simple cycles are obtainable. When applied to life cycle analysis in ecology, the proposed method

Wang, Mei

344

Organization | Department of Energy  

Energy Savers (EERE)

About Us Organization Organization Organization Printable PDF News & Blog CIO Leadership Organization Contact Us...

345

Organization | Department of Energy  

Office of Environmental Management (EM)

About Us Organization Organization Organization News Leadership Organization History Careers Contact Us...

346

System study on partial gasification combined cycle with CO{sub 2} recovery - article no. 051801  

SciTech Connect

S partial gasification combined cycle with CO{sub 2} recovery is proposed in this paper. Partial gasification adopts cascade conversion of the composition of coal. Active composition of coal is simply gasified, while inactive composition, that is char, is burnt in a boiler. Oxy-fuel combustion of syngas produces only CO{sub 2} and H{sub 2}O, so the CO{sub 2} can be separated through cooling the working fluid. This decreases the amount of energy consumption to separate CO{sub 2} compared with conventional methods. The novel system integrates the above two key technologies by injecting steam from a steam turbine into the combustion chamber of a gas turbine to combine the Rankine cycle with the Brayton cycle. The thermal efficiency of this system will be higher based on the cascade utilization of energy level. Compared with the conventional integrated gasification combined cycle (IGCC), the compressor of the gas turbine, heat recovery steam generator (HRSG) and gasifier are substituted for a pump, reheater, and partial gasifier, so the system is simplified. Furthermore, the novel system is investigated by means of energy-utilization diagram methodology and provides a simple analysis of their economic and environmental performance. As a result, the thermal efficiency of this system may be expected to be 45%, with CO{sub 2} recovery of 41.2%, which is 1.5-3.5% higher than that of an IGCC system. At the same time, the total investment cost of the new system is about 16% lower than that of an IGCC. The comparison between the partial gasification technology and the IGCC technology is based on the two representative cases to identify the specific feature of the proposed system.

Xu, Y.J.; Jin, H.G.; Lin, R.M.; Han, W. [Chinese Academy of Science, Beijing (China)

2008-09-15T23:59:59.000Z

347

PROPRIETARY MATERIAL. 2011 The McGraw-Hill Companies, Inc. Limited distribution permitted only to teachers and educators for course preparation. If you are a student using this Manual, you are using it without permission.  

E-Print Network (OSTI)

it without permission. 10-99 10-97E A geothermal power plant operating on the simple Rankine cycle using an organic fluid as the working fluid is considered. The exit temperature of the geothermal water from of geothermal water at the preheater, and the thermal efficiency of the Level I cycle of this plant

Bahrami, Majid

348

Helium process cycle  

DOE Patents (OSTI)

A unique process cycle and apparatus design separates the consumer (cryogenic) load return flow from most of the recycle return flow of a refrigerator and/or liquefier process cycle. The refrigerator and/or liquefier process recycle return flow is recompressed by a multi-stage compressor set and the consumer load return flow is recompressed by an independent consumer load compressor set that maintains a desirable constant suction pressure using a consumer load bypass control valve and the consumer load return pressure control valve that controls the consumer load compressor's suction pressure. The discharge pressure of this consumer load compressor is thereby allowed to float at the intermediate pressure in between the first and second stage recycle compressor sets. Utilizing the unique gas management valve regulation, the unique process cycle and apparatus design in which the consumer load return flow is separate from the recycle return flow, the pressure ratios of each recycle compressor stage and all main pressures associated with the recycle return flow are allowed to vary naturally, thus providing a naturally regulated and balanced floating pressure process cycle that maintains optimal efficiency at design and off-design process cycle capacity and conditions automatically.

Ganni, Venkatarao (Yorktown, VA)

2008-08-12T23:59:59.000Z

349

Helium process cycle  

DOE Patents (OSTI)

A unique process cycle and apparatus design separates the consumer (cryogenic) load return flow from most of the recycle return flow of a refrigerator and/or liquefier process cycle. The refrigerator and/or liquefier process recycle return flow is recompressed by a multi-stage compressor set and the consumer load return flow is recompressed by an independent consumer load compressor set that maintains a desirable constant suction pressure using a consumer load bypass control valve and the consumer load return pressure control valve that controls the consumer load compressor's suction pressure. The discharge pressure of this consumer load compressor is thereby allowed to float at the intermediate pressure in between the first and second stage recycle compressor sets. Utilizing the unique gas management valve regulation, the unique process cycle and apparatus design in which the consumer load return flow is separate from the recycle return flow, the pressure ratios of each recycle compressor stage and all main pressures associated with the recycle return flow are allowed to vary naturally, thus providing a naturally regulated and balanced floating pressure process cycle that maintains optimal efficiency at design and off-design process cycle capacity and conditions automatically.

Ganni, Venkatarao (Yorktown, VA)

2007-10-09T23:59:59.000Z

350

Power Plant Cycling Costs  

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

Power Plant Cycling Costs Power Plant Cycling Costs April 2012 N. Kumar, P. Besuner, S. Lefton, D. Agan, and D. Hilleman Intertek APTECH Sunnyvale, California NREL Technical Monitor: Debra Lew Subcontract Report NREL/SR-5500-55433 July 2012 NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency & Renewable Energy, operated by the Alliance for Sustainable Energy, LLC. National Renewable Energy Laboratory 15013 Denver West Parkway Golden, Colorado 80401 303-275-3000 * www.nrel.gov Contract No. DE-AC36-08GO28308 Power Plant Cycling Costs April 2012 N. Kumar, P. Besuner, S. Lefton, D. Agan, and D. Hilleman Intertek APTECH Sunnyvale, California NREL Technical Monitor: Debra Lew Prepared under Subcontract No. NFT-1-11325-01

351

Ecosystem element cycling Introduction  

E-Print Network (OSTI)

be responsible for well over 50% of the "wet mass" of organisms. The "dry mass" of living organisms, which is composed of other molecules, is often referred to as biomass. There are four basic types of molecules carbon atoms, and energy is released as carbohydrates and fats are transformed to carbon dioxide

Ickert-Bond, Steffi

352

mathematical Study program cycle  

E-Print Network (OSTI)

TSW ECTS TSW Fundamentals of statistics 2 2 0 5 150 0 0 0 0 0 5 150 Probability 4 3 0 10 300 0 0 0 0 0127 mathematical statistics Master's study programms #12;128 #12;· Study program cycle: Second Statistics. In Slovenian: magister matematicne statistike (masculine), magistrica matematicne statistike

Â?umer, Slobodan

353

CLASS DESCRIPTIONS CYCLING SERIES  

E-Print Network (OSTI)

will utilize concepts from the 50-minute cycling class while going the distance to optimal health. Whether you're an avid cyclist, triathlete, or desire a longer class for a greater challenge, join us for this 75-minute AN URBANATHLETE Are you registered to compete in an adventure race like the Men's Health Urbanathlon, Warrior Dash

Pittendrigh, Barry

354

Applications guide for waste heat recovery. Final Report, May-Dec. 1982  

SciTech Connect

The state-of-the-art of commercially available organic Rankine cycle (ORC) hardware from a literature search and industry survey is assessed. Engineering criteria for applying ORC technology are established, and a set of nomograms to enable the rapid sizing of the equipment is presented. A comparison of an ORC system with conventional heat recovery techniques can be made with a nomogram developed for a recuperative heat exchanger. A graphical technique for evaluating the economic aspects of an ORC system and conventional heat recovery method is discussed: also included is a description of anticipated future trends in organic Rankine cycle R D.

Moynihan, P.I.

1983-01-01T23:59:59.000Z

355

Numerical Simulation of the Wave Bottom Boundary Layer  

E-Print Network (OSTI)

are coupled to the wave cycle; phases of accelerating ow organize the boundary layer structure, decelerating; Zhao and Anastasiou, 1993; Feddersen and Guza, 2000; and Rankin and Hires, 2000]; others have the boundary layer and induce an in ectional instability at ow reversal, while accelerations tend to organize

Slinn, Donald

356

Building Life-Cycle Cost (BLCC) Program | Open Energy Information  

Open Energy Info (EERE)

Building Life-Cycle Cost (BLCC) Program Building Life-Cycle Cost (BLCC) Program Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Building Life-Cycle Cost (BLCC) Program Agency/Company /Organization: United States Department of Energy Partner: National Institute of Standards and Technology Sector: Energy Focus Area: Buildings, Energy Efficiency Phase: Create a Vision, Determine Baseline, Evaluate Options, Develop Goals, Prepare a Plan Topics: Finance, Pathways analysis Resource Type: Software/modeling tools User Interface: Desktop Application Website: www1.eere.energy.gov/femp/information/download_blcc.html Cost: Free OpenEI Keyword(s): EERE tool, Building Life-Cycle Cost, BLCC References: Building Life-Cycle Cost (BLCC) Programs[1] Building Energy Software Tools Directory: BLCC[2]

357

MHK Technologies/Open Cycle OTEC | Open Energy Information  

Open Energy Info (EERE)

OTEC OTEC < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Open Cycle OTEC.jpg Technology Profile Primary Organization Ocean Engineering and Energy Systems Technology Resource Click here OTEC Technology Type Click here OTEC - Open Cycle Technology Readiness Level Click here TRL 1 3 Discovery Concept Def Early Stage Dev Design Engineering Technology Description Closed Cycle OTEC In the closed cycle OTEC system warm seawater vaporizes a working fluid such as ammonia flowing through a heat exchanger evaporator The vapor expands at moderate pressures and turns a turbine coupled to a generator that produces electricity The vapor is then condensed in another heat exchanger condenser using cold seawater pumped from the ocean s depths through a cold water pipe The condensed working fluid is pumped back to the evaporator to repeat the cycle The working fluid remains in a

358

D-Cycle - 4-Differential -Stroke Cycle | Department of Energy  

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

-Stroke Cycle The D-Cycle offers the opportunity to use less fuel and gain more power while being able to be retrofit to an OEM and aftermarket engines deer09conti.pdf...

359

BNL | Carbon Cycle Science  

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

The Carbon Cycle Science & Technology Group aims to increase understanding The Carbon Cycle Science & Technology Group aims to increase understanding of the impacts of global change on managed and unmanaged ecosystems and improve knowledge of possible global change mitigation approaches. The group has three main focus areas. FACE Climate Change Experimental Facility Design and Management The CCS&T group is an internationally recognized leader in the development of Free Air CO2 Enrichment (FACE) research facilities. We are interested in the design and management of manipulative experiments that examine the effects of carbon dioxide, ozone, other atmospheric pollutants, temperature and precipitation on natural and managed ecosystems. FACE Plant Physiology and High Throughput Biochemical Phenotyping At FACE facilities we have studied the mechanisms that underlie the

360

Fuel Cycle Subcommittee  

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

Report to NEAC Report to NEAC Fuel Cycle Subcommittee Meeting of April 23, 2013 Washington D.C. June 13, 2013 Burton Richter (Chair), Margaret Chu, Darleane Hoffman, Raymond Juzaitis, Sekazi K Mtingwa, Ronald P Omberg, Joy L Rempe, Dominique Warin 2 I Introduction and Summary The Fuel Cycle Subcommittee of NEAC met in Washington on April 23, 2013. The meeting focused on issues relating to the NE advanced reactor program (sections II, III, and IV), and on storage and transportation issues (section V) related to a possible interim storage program that is the first step in moving toward a new permanent repository as recommended by the Blue Ribbon Commission (BRC) and discussed in the recent response by DOE to Congress on the BRC report 1 . The agenda is given in

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


361

CANDU fuel cycle flexibility  

SciTech Connect

High neutron economy, on-power refuelling, and a simple bundle design provide a high degree of flexibility that enables CANDU (CANada Deuterium Uranium; registered trademark) reactors to be fuelled with a wide variety of fuel types. Near-term applications include the use of slightly enriched uranium (SEU), and recovered uranium (RU) from reprocessed spent Light Water Reactor (LWR) fuel. Plutonium and other actinides arising from various sources, including spent LWR fuel, can be accommodated, and weapons-origin plutonium could be destroyed by burning in CANDU. In the DUPIC fuel cycle, a dry processing method would convert spent Pressurized Water Reactor (PWR) fuel to CANDU fuel. The thorium cycle remains of strategic interest in CANDU to ensure long-term resource availability, and would be of specific interest to those countries possessing large thorium reserves, but limited uranium resources.

Torgerson, D.F.; Boczar, P.G. [Chalk River Lab., Ontario (Canada); Dastur, A.R. [AECL CANDU, Mississauga, Ontario (Canada)

1994-12-31T23:59:59.000Z

362

USCEA fuel cycle '93  

SciTech Connect

The US Council for Energy Awareness sponsored the Fuel Cycle '93 conference in Dallas, Texas, on March 21-24, 1993. Over 250 participants attended, numerous papers were presented, and several panel discussions were held. The focus of most industry participants remains the formation of USEC and the pending US-Russian HEU agreement. Following are brief summaries of two key papers and the Fuel Market Issues panel discussion.

Not Available

1993-04-01T23:59:59.000Z

363

American business cycles and innovation  

E-Print Network (OSTI)

introduces the concepts of innovation and invention. The second section discusses the business cycles and highlights general causes of business cycles. The final section details the history of the iron, steel, aluminum, and pharmaceutical industries...

Hood, Michael

2013-02-22T23:59:59.000Z

364

Organic Photovoltaics  

Science Journals Connector (OSTI)

Satisfying the world's growing demand for energy is an urgent societal challenge. Organic photovoltaics holds promise as a cost-efficient and environmentally friendly solution.

Kippelen, Bernard

2007-01-01T23:59:59.000Z

365

Edinburgh Research Explorer Money Cycles  

E-Print Network (OSTI)

Edinburgh Research Explorer Money Cycles Citation for published version: Clausen, A & Strub, C 2014 'Money Cycles' Edinburgh School of Economics Discussion Paper Series. Link: Link to publication record date: 11. Dec. 2014 #12;Edinburgh School of Economics Discussion Paper Series Number 249 Money Cycles

Millar, Andrew J.

366

HEURISTIC SEARCH FOR HAMILTON CYCLES  

E-Print Network (OSTI)

by combining it with the remaining cycles. The following is the description of the main part of the algorithmHEURISTIC SEARCH FOR HAMILTON CYCLES IN CUBIC GRAPHS Janez ALES, Bojan MOHAR and Tomaz PISANSKI. A successful heuristic algorithm for nding Hamilton cycles in cubic graphs is described. Several graphs from

Mohar, Bojan

367

MULTIPARAMETER OPTIMIZATION STUDIES ON GEOTHERMAL ENERGY CYCLES  

E-Print Network (OSTI)

of Practical Cycles for Geothermal Power Plants." GeneralDesign and Optimize Geothermal Power Cycles." Presented atof Practical Cycles for Geothermal Power Plants." General

Pope, W.L.

2011-01-01T23:59:59.000Z

368

n-step cycle inequalities - Optimization Online  

E-Print Network (OSTI)

also introduced the so-called cycle inequalities (called 1-step cycle inequalities in this ...... combination of the cycle detection strategy of Tarjan [16] and the ...

2014-07-02T23:59:59.000Z

369

Life-cycle Assessment of Semiconductors  

E-Print Network (OSTI)

life-cycle energy requirements (e total ) and global warmingtotal life-cycle global warming impacts. Chapter 3 Life-cycle Energy and Global

Boyd, Sarah B.

2009-01-01T23:59:59.000Z

370

Quantum thermodynamic cooling cycle  

E-Print Network (OSTI)

The quantum-mechanical and thermodynamic properties of a 3-level molecular cooling cycle are derived. An inadequacy of earlier models is rectified in accounting for the spontaneous emission and absorption associated with the coupling to the coherent driving field via an environmental reservoir. This additional coupling need not be dissipative, and can provide a thermal driving force - the quantum analog of classical absorption chillers. The dependence of the maximum attainable cooling rate on temperature, at ultra-low temperatures, is determined and shown to respect the recently-established fundamental bound based on the second and third laws of thermodynamics.

Palao, J P; Gordon, J M; Palao, Jose P.; Kosloff, Ronnie; Gordon, Jeffrey M.

2001-01-01T23:59:59.000Z

371

Quantum thermodynamic cooling cycle  

E-Print Network (OSTI)

The quantum-mechanical and thermodynamic properties of a 3-level molecular cooling cycle are derived. An inadequacy of earlier models is rectified in accounting for the spontaneous emission and absorption associated with the coupling to the coherent driving field via an environmental reservoir. This additional coupling need not be dissipative, and can provide a thermal driving force - the quantum analog of classical absorption chillers. The dependence of the maximum attainable cooling rate on temperature, at ultra-low temperatures, is determined and shown to respect the recently-established fundamental bound based on the second and third laws of thermodynamics.

Jose P. Palao; Ronnie Kosloff; Jeffrey M. Gordon

2001-06-08T23:59:59.000Z

372

Geothermal Life Cycle Calculator  

SciTech Connect

This calculator is a handy tool for interested parties to estimate two key life cycle metrics, fossil energy consumption (Etot) and greenhouse gas emission (ghgtot) ratios, for geothermal electric power production. It is based solely on data developed by Argonne National Laboratory for DOE’s Geothermal Technologies office. The calculator permits the user to explore the impact of a range of key geothermal power production parameters, including plant capacity, lifetime, capacity factor, geothermal technology, well numbers and depths, field exploration, and others on the two metrics just mentioned. Estimates of variations in the results are also available to the user.

Sullivan, John

2014-03-11T23:59:59.000Z

373

Cycling on the Rise: Public Bicycles and other European Experiences | Open  

Open Energy Info (EERE)

Cycling on the Rise: Public Bicycles and other European Experiences Cycling on the Rise: Public Bicycles and other European Experiences Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Cycling on the Rise: Public Bicycles and other European Experiences Agency/Company /Organization: SpiCycles Focus Area: Transportation Resource Type: Publications, Lessons learned/best practices User Interface: Website Website: spicycles.velo.info/Portals/0/Deliverables/SpicyclesFinal_Booklet_smal Cost: Free Cycling on the Rise: Public Bicycles and other European Experiences Screenshot References: Cycling on the Rise: Public Bicycles and other European Experiences[1] "When the Spicycles project was launched in 2006, cycling was not the "hot" mode of transport that it has become today. As project partners, we wanted to gather experience related to specific areas of cycling policy.

374

Organic geochemistry and organic petrography  

SciTech Connect

The Vermillion Creek coals and shales contain dominantly humic organic matter originating from woody plant tissues except for one shale unit above the coals, which contains hydrogen-rich kerogen that is mostly remains of filamentous algae, of likely lacustrine origin. The coals have two unusual features - very low inertinite content and high sulfur content compared to mined western coals. However, neither of these features points to the limnic setting reported for the Vermillion Creek sequence. The vitrinite reflectance of Vermillion Creek shales is markedly lower than that of the coals and is inversely proportional to the H/C ratio of the shales. Rock-Eval pyrolysis results, analyses of H, C, and N, petrographic observations, isotope composition of organic carbon, and amounts and compositions of the CHCl/sub 3/-extractable organic matter all suggest mixtures of two types of organic matter in the Vermillion Creek coals and clay shales: (1) isotopically heavy, hydrogen-deficient, terrestrial organic matter, as was found in the coals, and (2) isotopically light, hydrogen-rich organic matter similar to that found in one of the clay-shale samples. The different compositions of the Vermillion Creek coal, the unnamed Williams Fork Formation coals, and coals from the Middle Pennsylvanian Marmaton and Cherokee Groups are apparently caused by differences in original plant composition, alteration of organic matter related to different pH conditions of the peat swamps, and slightly different organic maturation levels.

Bostick, N.H.; Hatch, J.R.; Daws, T.A.; Love, A.H.; Lubeck, S.C.M.; Threlkeld, C.N.

1987-01-01T23:59:59.000Z

375

Minister's son from Argyll. Professor at age 19 and FRS by 21. On  

E-Print Network (OSTI)

), theory of the steam engine (Rankine cycle), shock wave propagation (Rankine-Hugoniot equations cycles, (vindicated by the CLIMAP Project 1976). Born Dunbar, East Lothian. Emigrated to U.S. at age 11

Schnaufer, Achim

376

Techno-Economic Design Tools Used in Selecting Industrial Energy Recovery Systems  

E-Print Network (OSTI)

cost. output (245 kW) by the high-efficiency turb' ne. Assuming a $2.3-million installed cost differ The 38% rate of return after 5 years (47% aft 10 ential between the organic Rankine cycle/compressor years) is quite acceptable for companies looki.... These tools are the industrial heat pump program (IHOP) and the Rankine cycle power program (RANKCYCLE). IHOP is used if industrial process steam is the de sired energy form and if available heat sources consist either of hot water at 130-200 o F...

Hanus, N.

1982-01-01T23:59:59.000Z

377

Prospective Life-Cycle Modeling of Novel Carbon Capture Materials  

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

Prospective Life-Cycle Modeling of Novel Carbon Capture Materials Prospective Life-Cycle Modeling of Novel Carbon Capture Materials Speaker(s): Roger Sathre Date: December 5, 2011 - 3:30pm Location: 90-4133 Seminar Host/Point of Contact: Anita Estner Barbara Adams In this presentation we describe the prospective life-cycle modeling of metal-organic frameworks (MOF), a novel type of material with the potential for efficiently capturing CO2. Life-cycle modeling of emerging technologies, conducted early in the innovation process, can generate knowledge that can feed back to inform scientific discovery and development. We discuss the challenges of credibly modeling a system that does not yet exist, and describe methodological approaches including parametric system modeling (quantifying relations between system elements), scenario projections (defining plausible pathways for system scale-up),

378

Open cycle thermoacoustics  

SciTech Connect

A new type of thermodynamic device combining a thermodynamic cycle with the externally applied steady flow of an open thermodynamic process is discussed and experimentally demonstrated. The gas flowing through this device can be heated or cooled in a series of semi-open cyclic steps. The combination of open and cyclic flows makes possible the elimination of some or all of the heat exchangers (with their associated irreversibility). Heat is directly exchanged with the process fluid as it flows through the device when operating as a refrigerator, producing a staging effect that tends to increase First Law thermodynamic efficiency. An open-flow thermoacoustic refrigerator was built to demonstrate this concept. Several approaches are presented that describe the physical characteristics of this device. Tests have been conducted on this refrigerator with good agreement with a proposed theory.

Reid, Robert Stowers

2000-01-01T23:59:59.000Z

379

Carbon isotope ratios of organic compound fractions in oceanic suspended particles  

E-Print Network (OSTI)

Radiocarbon evidence of fossil-carbon cycling in sediments1968), Metabolic fractionation of carbon isotopes in marineof particulate organic carbon using bomb 14 C, Nature,

Hwang, Jeomshik; Druffel, Ellen R. M

2006-01-01T23:59:59.000Z

380

Advanced regenerative absorption refrigeration cycles  

DOE Patents (OSTI)

Multi-effect regenerative absorption cycles which provide a high coefficient of performance (COP) at relatively high input temperatures. An absorber-coupled double-effect regenerative cycle (ADR cycle) (10) is provided having a single-effect absorption cycle (SEA cycle) (11) as a topping subcycle and a single-effect regenerative absorption cycle (1R cycle) (12) as a bottoming subcycle. The SEA cycle (11) includes a boiler (13), a condenser (21), an expansion device (28), an evaporator (31), and an absorber (40), all operatively connected together. The 1R cycle (12) includes a multistage boiler (48), a multi-stage resorber (51), a multisection regenerator (49) and also uses the condenser (21), expansion device (28) and evaporator (31) of the SEA topping subcycle (11), all operatively connected together. External heat is applied to the SEA boiler (13) for operation up to about 500 degrees F., with most of the high pressure vapor going to the condenser (21) and evaporator (31) being generated by the regenerator (49). The substantially adiabatic and isothermal functioning of the SER subcycle (12) provides a high COP. For higher input temperatures of up to 700 degrees F., another SEA cycle (111) is used as a topping subcycle, with the absorber (140) of the topping subcycle being heat coupled to the boiler (13) of an ADR cycle (10). The 1R cycle (12) itself is an improvement in that all resorber stages (50b-f) have a portion of their output pumped to boiling conduits (71a-f) through the regenerator (49), which conduits are connected to and at the same pressure as the highest pressure stage (48a) of the 1R multistage boiler (48).

Dao, Kim (14 Nace Ave., Piedmont, CA 94611)

1990-01-01T23:59:59.000Z

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


381

The collaboration between Int J Life Cycle Assess and J LCA Jpn  

Science Journals Connector (OSTI)

Many studies have been conducted for assessing the environmental impacts of organic agriculture. In general, they compare a few ... system thinking based on life cycle assessment (LCA). Therefore, this paper revi...

Yasunari Matsuno; Yasushi Kondo

2008-11-01T23:59:59.000Z

382

AMMONIA RECEIVER DESIGN FOR DISH CONCENTRATORS Rebecca I. Dunn, Keith Lovegrove and Greg Burgess  

E-Print Network (OSTI)

, and coupled with a power cycle (Rankine or Brayton), can be used to produce dispatchable power. At 20MPa

383

Carbon Cycle 2.0  

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

Carbon Cycle 2.0 Carbon Cycle 2.0 Pioneering science for sustainable energy solutions Artificial Photosynthesis Energy Storage Combustion Carbon Capture & Storage Developing World Efficiency Photovoltaics Biofuels Energy Analysis Climate Modeling Carbon Cycle 2.0 is... 1. A vision for * a global energy system integrated with the Earth's natural carbon cycles * an interactive Berkeley Lab environment with a shared sense of purpose 2. A program development plan that will allow us to deepen our capabilities and provide more opportunities to have impact 3. An attempt to integrate our basic research with applications using models of technology deployment constraints 4. Set of internal activities aimed at priming the effort

384

Building Life Cycle Cost Programs  

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

The National Institute of Standards and Technology (NIST) developed the Building Life Cycle Cost (BLCC) Program to provide computational support for the analysis of capital investments in buildings.

385

Minimize Boiler Short Cycling Losses  

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

This tip sheet on minimizing boiler short cycling losses provides how-to advice for improving industrial steam systems using low-cost, proven practices and technologies.

386

Virtuous Cycle Cycles of activity and software projects  

E-Print Network (OSTI)

Inspection #12;Programming Cycle - single bug Selected Bug Shared Code Fix Bug Continuous Integration ~8 cycle cvscheck compilation style checking testing javadocs documentation jumble quality of unit testing #12;NetValue Development cvscheck - Source Code Control and Build Shared Centralized Automatic

Pfahringer, Bernhard

387

A&A 407, 315324 (2003) DOI: 10.1051/0004-6361:20030854  

E-Print Network (OSTI)

is high enough to discharge through a system of sparks, cycling on and off on natural time to another in a very organized manner, to the extent that they form apparent driftbands of duration from- tion P3 between them measured in pulsar periods P1 ranges from about 1 to about 15 (Backer 1973; Rankin

388

Temperature Influences Selective Mortality during the Early Life Stages of a Coral Reef Fish  

E-Print Network (OSTI)

L. Rankin, Su Sponaugle* Marine Biology and Fisheries, Rosenstiel School of Marine and Atmospheric Science (RSMAS)/University of Miami, Miami, Florida, United States of America Abstract For organisms with complex life cycles, processes occurring at the interface between life stages can disproportionately

Sponaugle, Su

389

Washington Update February 6, 2012  

E-Print Network (OSTI)

Report: A U.S. Carbon Cycle Science Plan ACTION ALERT: CNSF Seeks Institutions to Sign Letter Objecting of Oklahoma. CNSF is asking institutions that want to sign onto the letter to contact Sam Rankin smr and Government Reform Committee to work out the troublesome #12;provisions. UCAR as an organization has

390

Geomicrobiology Journal, 26:189198, 2009 Copyright Taylor & Francis Group, LLC  

E-Print Network (OSTI)

and Ocean Sciences, Inha University, Incheon 402­751, Republic of Korea 4 Rankin Science South, Appalachian Aurantimonas. Other organisms within this clade have been isolated from disparate environments such as surface distributed around the globe and may be important contributors to Mn cycling in many environments. Our results

Dick, Christopher

391

Host specificity and molecular phylogeny of larval Digenea isolated from New Zealand and Australian topshells (Gastropoda: Trochidae)q  

E-Print Network (OSTI)

; Raffaelli, 2000). This gap in understanding may in part be due to their complex life cycle usually involving. Amongst marine organisms, a wide variety of animals, including gastropods, bivalves, crustaceans, brachiopods annelids and fish, can act as the second intermediate host (Rankin, 1946; Bowers and James, 1967

Poulin, Robert

392

Seasonal variation in fat content of mackerel (Scomberscombrus L.) caught  

E-Print Network (OSTI)

biochemistry in Newfoundland winter herring (Clupea harengus harengus) are influenced by the reproductive cycle of June when young pelagic stages of fish, augmented with large crustaceans, are eaten. These organisms form the staple food of mackerel until the end of November (Steven, 1949; Walsh and Rankine, 1979

393

Technoeconomic Analysis of Biofuel Production and Biorefinery Operation Utilizing Geothermal Energy  

Science Journals Connector (OSTI)

Technoeconomic Analysis of Biofuel Production and Biorefinery Operation Utilizing Geothermal Energy ... A technoeconomic study is conducted to assess the feasibility of integrating geothermal energy into a biorefinery for biofuel production. ... Geothermal energy is utilized in the refinery to generate process steam for gasification and steam-methane reforming in addition to providing excess electricity via the organic Rankine cycle. ...

Sudhanya Banerjee; Jordan A. Tiarks; Maciej Lukawski; Song-Charng Kong; Robert C. Brown

2013-02-28T23:59:59.000Z

394

A new parabolic trough solar collector P. Kohlenbach1  

E-Print Network (OSTI)

oil is circulated inside the absorber tube, and transfers the heat to a ORC FP6 unit sourced from of this facility, to develop efficient new methods of capturing and harnessing solar heat for combined heat) and remote power and energy. The array is designed to drive a small Organic Rankine Cycle unit with a power

395

Life Cycle Asset Management  

Directives, Delegations, and Requirements

(The following directives are deleted or consolidated into this Order and shall be phased out as noted in Paragraph 2: DOE 1332.1A; DOE 4010.1A; DOE 4300.1C; DOE 4320.1B; DOE 4320.2A; DOE 4330.4B; DOE 4330.5; DOE 4540.1C; DOE 4700.1). This Order supersedes specific project management provisions within DOE O 430.1A, LIFE CYCLE ASSET MANAGEMENT. The specific paragraphs canceled by this Order are 6e(7); 7a(3); 7b(11) and (14); 7c(4),(6),(7),(11), and (16); 7d(4) and (8); 7e(3),(10), and (17); Attachment 1, Definitions (item 30 - Line Item Project, item 42 - Project, item 48 - Strategic System); and Attachment 2, Contractor Requirements Document (paragraph 1d regarding a project management system). The remainder of DOE O 430.1A remains in effect. Cancels DOE O 430.1. Canceled by DOE O 413.3.

1998-10-14T23:59:59.000Z

396

Natural Gas Combined Cycle  

E-Print Network (OSTI)

The “Coal Ash Corrosion Resistant Materials Testing Program ” is being conducted by B&W at Reliant Energy’s Niles plant in Niles, Ohio. The total estimated cost of $1,864,603 is co-funded by DOE contributing 37.5%, OCDO providing 33.3 % and B&W providing 17%. The remaining 12 % is in-kind contributions by Reliant Energy and tubing suppliers. Materials development is important to the power industry, and to the use of coal. Figure 1 compares the cost of electricity for subcritical and supercritical coal-fired plants with a natural gas combined cycle (NGCC) plant based on an 85 % capacity factor. This shows that at $1.20/MBtu for fuel, coal is competitive with NGCC when gas is at $3.40/MBtu or higher. An 85 % capacity factor is realistic for a coal-fired plant, but NGCC plants are currently only achieving about 60%. This gives coal an advantage if compared on the basis of cost per kW generated per year. When subcritical and supercritical plants are compared,

Dennis K. Mcdonald; Subcritical Coal Plant; Supercritical Coal Plant

397

Fractionation of Dissolved Solutes and Chromophoric Dissolved Organic Matter During Experimental Sea Ice Formation.  

E-Print Network (OSTI)

In the past decade there has been an overall decrease in Arctic Ocean sea ice cover. Changes to the ice cover have important consequences for organic carbon cycling, especially over the continental shelves. When sea ice is formed, dissolved organic...

Smith, Stephanie 1990-

2012-04-16T23:59:59.000Z

398

Nuclear fuel cycle information workshop  

SciTech Connect

This overview of the nuclear fuel cycle is divided into three parts. First, is a brief discussion of the basic principles of how nuclear reactors work; second, is a look at the major types of nuclear reactors being used and world-wide nuclear capacity; and third, is an overview of the nuclear fuel cycle and the present industrial capability in the US.

Not Available

1983-01-01T23:59:59.000Z

399

Extreme Financial cycles$ B. Candelonb,  

E-Print Network (OSTI)

Extreme Financial cycles$ B. Candelonb, , G. Gauliera , C. Hurlinb aUniversity Maastricht proposes a new approach to date extreme financial cycles. Elabo- rating on recent methods in extreme value theory, it elaborates an extension of the famous calculus rule to detect extreme peaks and troughs

Paris-Sud XI, Université de

400

Reading Comprehension - The Water Cycle  

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

The Water Cycle The Water Cycle Evaporation, Condensation and Precipitation The _________ moon sun water clouds evaporates _________ fish oceans rain water from lakes and oceans. As the air rises, it cools. The water vapor condenses into tiny droplets of _________ evaporation clouds water sunshine . The droplets crowd together and form a _________ cloud lake storm precipitation . Wind blows the _________ rain sun droplet cloud towards the land. The tiny droplets join together and fall as precipitation to the _________ river lake ground cloud . The water soaks into the ground and collects in _________ rivers and lakes oceans and clouds jars and cups plants and animals . The _________ storm cycle river house that never ends has started again! A water cycle diagram. Use the diagram to identify the different parts of the water cycle:

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


401

CMVRTC: Heavy Truck Duty Cycle  

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

heavy truck duty cycle (HTDC) project heavy truck duty cycle (HTDC) project OVERVIEW The Heavy Truck Duty Cycle (HTDC) Project was initiated in 2004 and is sponsored by the US Department of Energy's (DOE's) Office of FreedomCar and Vehicle Technologies Program. ORNL designed the research program to generate real-world-based duty cycle data from trucks operating in long-haul operations and was designed to be conducted in three phases: identification of parameters to be collected, instrumentation and pilot testing, identification of a real-world fleet, design of the data collection suite and fleet instrumentation, and data collection, analysis, and development of a duty cycle generation tool (DCGT). ANL logo dana logo michelin logo Schrader logo This type of data will be useful for supporting energy efficiency

402

Fuel cycle cost uncertainty from nuclear fuel cycle comparison  

SciTech Connect

This paper examined the uncertainty in fuel cycle cost (FCC) calculation by considering both model and parameter uncertainty. Four different fuel cycle options were compared in the analysis including the once-through cycle (OT), the DUPIC cycle, the MOX cycle and a closed fuel cycle with fast reactors (FR). The model uncertainty was addressed by using three different FCC modeling approaches with and without the time value of money consideration. The relative ratios of FCC in comparison to OT did not change much by using different modeling approaches. This observation was consistent with the results of the sensitivity study for the discount rate. Two different sets of data with uncertainty range of unit costs were used to address the parameter uncertainty of the FCC calculation. The sensitivity study showed that the dominating contributor to the total variance of FCC is the uranium price. In general, the FCC of OT was found to be the lowest followed by FR, MOX, and DUPIC. But depending on the uranium price, the FR cycle was found to have lower FCC over OT. The reprocessing cost was also found to have a major impact on FCC.

Li, J.; McNelis, D. [Institute for the Environment, University of North Carolina, Chapel Hill (United States); Yim, M.S. [Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology (Korea, Republic of)

2013-07-01T23:59:59.000Z

403

International Nuclear Fuel Cycle Fact Book. Revision 5  

SciTech Connect

This Fact Book has been compiled in an effort to provide: (1) an overview of worldwide nuclear power and fuel cycle programs; and (2) current data concerning fuel cycle and waste management facilities, R and D programs, and key personnel in countries other than the United States. Additional information on each country's program is available in the International Source Book: Nuclear Fuel Cycle Research and Development, PNL-2478, Rev. 2. The Fact Book is organized as follows: (1) Overview section - summary tables which indicate national involvement in nuclear reactor, fuel cycle, and waste management development activities; (2) national summaries - a section for each country which summarizes nuclear policy, describes organizational relationships and provides addresses, names of key personnel, and facilities information; (3) international agencies - a section for each of the international agencies which has significant fuel cycle involvement; (4) energy supply and demand - summary tables, including nuclear power projections; (5) fuel cycle - summary tables; and (6) travel aids international dialing instructions, international standard time chart, passport and visa requirements, and currency exchange rate.

Harmon, K.M.; Lakey, L.T.; Leigh, I.W.; Jeffs, A.G.

1985-01-01T23:59:59.000Z

404

International nuclear fuel cycle fact book. Revision 4  

SciTech Connect

This Fact Book has been compiled in an effort to provide (1) an overview of worldwide nuclear power and fuel cycle programs and (2) current data concerning fuel cycle and waste management facilities, R and D programs, and key personnel in countries other than the United States. Additional information on each country's program is available in the International Source Book: Nuclear Fuel Cycle Research and Development, PNL-2478, Rev. 2. The Fact Book is organized as follows: (1) Overview section - summary tables which indicate national involvement in nuclear reactor, fuel cycle, and waste management development activities; (2) national summaries - a section for each country which summarizes nuclear policy, describes organizational relationships and provides addresses, names of key personnel, and facilities information; (3) international agencies - a section for each of the international agencies which has significant fuel cycle involvement; (4) energy supply and demand - summary tables, including nuclear power projections; (5) fuel cycle - summary tables; and (6) travel aids - international dialing instructions, international standard time chart, passport and visa requirements, and currency exchange rate.

Harmon, K.M.; Lakey, L.T.; Leigh, I.W.

1984-03-01T23:59:59.000Z

405

ARM - Evaluation Product - Organic Aerosol Component VAP  

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

ProductsOrganic Aerosol Component VAP ProductsOrganic Aerosol Component VAP Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Evaluation Product : Organic Aerosol Component VAP 2011.01.08 - 2012.03.24 Site(s) SGP General Description Organic aerosol (OA, i.e., the organic fraction of particles) accounts for 10-90% of the fine aerosol mass globally and is a key determinant of aerosol radiative forcing. But atmospheric OA is poorly characterized and its life cycle insufficiently represented in models. As a result, current models are unable to simulate OA concentrations and properties. This deficiency represents a large source of uncertainty in the quantification of aerosol direct and indirect effects and the prediction of future climate change. The Organic Aerosol Component (OACOMP) value-added product (VAP) uses

406

Environmental performance indicators of organic spreading machines  

E-Print Network (OSTI)

industrial and agronomical databases but the LCA agricultural machinery database is not well adapted-03150 Montoldre, France 2 Chambre d'Agriculture de Bretagne, Station des Cormiers, F-35140 Saint Aubin impacts generated by organic product spreading is obtained from Life Cycle Assessment (LCA). LCA uses

Paris-Sud XI, Université de

407

CMVRTC: Medium Truck Duty Cycle  

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

medium truck duty cycle (MTdc) project medium truck duty cycle (MTdc) project OVERVIEW The Medium Truck Duty Cycle (MTDC) project involves efforts to collect, analyze and archive data related to medium-truck operations in real-world driving environments. Such data and information will be useful to support technology evaluation efforts and to provide a means of accounting for real-world driving performance within medium-class truck analyses. The project involves private industry partners from various truck vocations. The MTDC project is unique in that there currently does not exist a national database of characteristic duty cycles for medium trucks. This project involves the collection of data from multiple vocations (four vocations) and multiple vehicles within these vocations (three vehicles per

408

Minimize Boiler Short Cycling Losses  

SciTech Connect

This revised ITP tip sheet on minimizing boiler short cycling losses provides how-to advice for improving industrial steam systems using low-cost, proven practices and technologies.

Not Available

2006-01-01T23:59:59.000Z

409

Accounting for indirect land-use change in the life cycle assessment of biofuel supply chains  

Science Journals Connector (OSTI)

...life cycle analysis (LCA) for estimating the...projections; Food and Agriculture Organization of the United...general equilibrium (GE) LCA flows; partial equilibrium...values for input to the LCA. The actual availability...g. US Department of Agriculture or Organization for Economic...

2012-01-01T23:59:59.000Z

410

Sustainability Features of Nuclear Fuel Cycle Options  

E-Print Network (OSTI)

The nuclear fuel cycle is the series of stages that nuclear fuel materials go through in a cradle to grave framework. The Once Through Cycle (OTC) is the current fuel cycle implemented in the United States; in which an ...

Passerini, Stefano

411

Preliminary studies on the heat exchanger option for S-CO{sub 2} power conversion cycle coupled to water cooled SMR  

SciTech Connect

For more than a half century, the steam Rankine cycle had been the major power conversion cycle for a nuclear power plant. However, as the interest on the next generation reactors grows, a variety of alternative power conversion systems have been studied. Among them, the S-CO{sub 2} cycle (Supercritical carbon dioxide Brayton cycle) is considered as a promising candidate due to several benefits such as 1) Relatively high thermal efficiency at relatively low turbine inlet temperature, 2) High efficiency with simple lay-out 3) Compactness of turbo-machineries. 4) Compactness of total cycle combined with PCHE (Printed Circuit Heat Exchanger). According to the conventional classification of heat exchangers (HE), there are three kind of HE, 1) Tubular HEs, 2) Plate-type HEs, 3) Extended surface HEs. So far, the researcher has mostly assumed PCHE type HE for the S-CO{sub 2} cycle due to its compactness with reasonably low pressure drop. However, PCHE is currently one of the most expensive components in the cycle, which can have a negative effect on the economics of the cycle. Therefore, an alternative for the HE should be seriously investigated. By comparing the operating condition (pressure and temperature) there are three kind of HE in the S-CO{sub 2} cycle, 1) IHX (Intermediate Heat exchanger) 2) Recuperator and 3) Pre-cooler. In each heat exchanger, hot side and cold side coolants are different, i.e. reactor coolant to S-CO{sub 2} (IHX), S-CO{sub 2} to S-CO{sub 2}(Recuperator), S-CO{sub 2} to water (Pre-cooler). By considering all the attributes mentioned above, all existing types of heat exchangers are compared to find a possible alternative to PCHE. The comparing factors are 1) Size(volume), 2) Cost. Plate fin type HEs are considered to be the most competitive heat exchanger regarding the size and the cost after some improvements on the design limit are made. (authors)

Ahn, Y.; Lee, J. [Dept. of Nuclear and Quantum Engineering, Korea Advanced Inst. of Science and Technology, 373-1 Guseong-dong Yuseong-gu, Daejeon, 305-701 (Korea, Republic of); Lee, J. I. [Dept. of Nuclear and Quantum Engineering, Korea Advanced Inst. of Science and Technology, 373-1 Guseong-dong Yuseong-gu, Daejeon, 305-701 (Korea, Republic of); Dept. of Nuclear Engineering, Khalifa Univ. of Science, Technology and Research (KUSTAR), P.O.Box 127788, Abu Dhabi (United Arab Emirates)

2012-07-01T23:59:59.000Z

412

New Regenerative Cycle for Vapor Compression Refrigeration  

Office of Scientific and Technical Information (OSTI)

SCIENTIFIC REPORT SCIENTIFIC REPORT Title Page Project Title: New Regenerative Cycle for Vapor Compression Refrigeration DOE Award Number: DE-FG36-04GO14327 Document Title: Final Scientific Report Period Covered by Report: September 30, 2004 to September 30, 2005 Name and Address of Recipient Organization: Magnetic Development, Inc., 68 Winterhill Road, Madison, CT 06443, phone: 203-214-7247, fax: 203-421-7948, e-mail: mjb1000@aol.com Contact Information: Mark J. Bergander, Ph.D., P.E., Principal Investigator, phone: 203-214-7247, fax: 203-421-7948, e-mail: mjb1000@aol.com Project Objective (as stated in the proposal): The main objective of this project is to confirm on a well-instrumented prototype the theoretically derived claims of higher efficiency and coefficient

413

Why sequence Sulfur cycling in the Frasassi aquifer?  

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

sulfur cycling in the Frasassi aquifer? sulfur cycling in the Frasassi aquifer? The terrestrial subsurface remains one of the least explored microbial habitats on earth, and is critical for understanding pollutant migration and attenuation, subsurface processes such as limestone dissolution (affecting porosity), and the search for life elsewhere in the solar system and beyond. The deep and sulfidic Frasassi aquifer (of Ancona, Italy) has emerged as a model system for studying sulfur cycling in the terrestrial subsurface, and this sequencing project has relevance for developing applications for wastewater treatment and capabilities relevant for radionuclide, metal and organic pollutant remediation that can be applied at environments at DOE subsurface sites. Principal Investigators: Jennifer Macalady, Penn State University

414

Nuclear Power Generation and Fuel Cycle Report 1997  

Gasoline and Diesel Fuel Update (EIA)

7) 7) Distribution Category UC-950 Nuclear Power Generation and Fuel Cycle Report 1997 September 1997 Energy Information Administration Office of Coal, Nuclear, Electric and Alternate Fuels U.S. Department of Energy Washington, DC 20585 This report was prepared by the Energy Information Administration, the independent statistical and analytical agency within the Department of Energy. The information contained herein should not be construed as advocating or reflecting any policy position of the Department of Energy or of any other organization. Contacts Energy Information Administration/ Nuclear Power Generation and Fuel Cycle Report 1997 ii The Nuclear Power Generation and Fuel Cycle Report is prepared by the U.S. Department of Energy's Energy Information Administration. Questions and comments concerning the contents of the report may be directed to:

415

Exergy Analysis of Stirling Cycle Cryogenerator  

Science Journals Connector (OSTI)

Exergy or the available work energy function is ... various systems. This paper attempts to present exergy analysis for Stirling cycle cryogenerator. The cycle...

K. G. Narayankhedkar

1998-01-01T23:59:59.000Z

416

Department of Energy Awards $15 Million for Nuclear Fuel Cycle Technology  

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

15 Million for Nuclear Fuel Cycle 15 Million for Nuclear Fuel Cycle Technology Research and Development Department of Energy Awards $15 Million for Nuclear Fuel Cycle Technology Research and Development August 1, 2008 - 2:40pm Addthis WASHINGTON, DC - The U.S. Department of Energy (DOE) today announced it will award up to $15 million to 34 research organizations as part of the Department's Advanced Fuel Cycle Initiative (AFCI). AFCI is the Department's nuclear energy research and development program supporting the long-term goals and objectives of the United States' nuclear energy policy. These projects will provide necessary data and analyses to further U.S. nuclear fuel cycle technology development, meet the need for advanced nuclear energy production and help to close the nuclear fuel cycle

417

NETL - Petroleum-Based Fuels Life Cycle Greenhouse Gas Analysis 2005  

Open Energy Info (EERE)

NETL - Petroleum-Based Fuels Life Cycle Greenhouse Gas Analysis 2005 NETL - Petroleum-Based Fuels Life Cycle Greenhouse Gas Analysis 2005 Baseline Model Jump to: navigation, search Tool Summary LAUNCH TOOL Name: NETL - Petroleum-Based Fuels Life Cycle Greenhouse Gas Analysis 2005 Baseline Model Agency/Company /Organization: National Energy Technology Laboratory Sector: Energy Topics: Baseline projection, GHG inventory Resource Type: Software/modeling tools Website: www.netl.doe.gov/energy-analyses/refshelf/results.asp?ptype=Models/Too References: NETL - Petroleum-Based Fuels Life Cycle Greenhouse Gas Analysis 2005 Baseline Model [1] NETL - Petroleum-Based Fuels Life Cycle Greenhouse Gas Analysis 2005 Baseline Model This model calculates the 2005 national average life cycle greenhouse gas emissions for petroleum-based fuels sold or distributed in the United

418

Life cycle assessment (LCA) and life cycle energy analysis (LCEA) of buildings and the building sector: A review  

Science Journals Connector (OSTI)

Abstract This review summarizes and organizes the literature on life cycle assessment (LCA), life cycle energy analysis (LCEA) and life cycle cost analysis (LCCA) studies carried out for environmental evaluation of buildings and building related industry and sector (including construction products, construction systems, buildings, and civil engineering constructions). The review shows that most LCA and LCEA are carried out in what is shown as “exemplary buildings”, that is, buildings that have been designed and constructed as low energy buildings, but there are very few studies on “traditional buildings”, that is, buildings such as those mostly found in our cities. Similarly, most studies are carried out in urban areas, while rural areas are not well represented in the literature. Finally, studies are not equally distributed around the world.

Luisa F. Cabeza; Lídia Rincón; Virginia Vilariño; Gabriel Pérez; Albert Castell

2014-01-01T23:59:59.000Z

419

Life Cycle Analysis: Integrated Gasification Combined Cycle (IGCC) Power Plant  

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

Life Cycle Analysis: Integrated Life Cycle Analysis: Integrated Gasification Combined Cycle (IGCC) Power Plant Revision 2, March 2012 DOE/NETL-2012/1551 Disclaimer This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or

420

The behavioral manipulation hypothesis Life cycle of  

E-Print Network (OSTI)

1 The behavioral manipulation hypothesis · No one knows how the parasite causes these Life cycle eat mostly hares · Linked cycles? Predator-Prey Cycles? · Think and then discuss: · Under the hypothesis that predators cause this cycle, what would you expect for the following when hare populations

Mitchell, Randall J.

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


421

SNMR pulse sequence phase cycling  

DOE Patents (OSTI)

Technologies applicable to SNMR pulse sequence phase cycling are disclosed, including SNMR acquisition apparatus and methods, SNMR processing apparatus and methods, and combinations thereof. SNMR acquisition may include transmitting two or more SNMR pulse sequences and applying a phase shift to a pulse in at least one of the pulse sequences, according to any of a variety cycling techniques. SNMR processing may include combining SNMR from a plurality of pulse sequences comprising pulses of different phases, so that desired signals are preserved and indesired signals are canceled.

Walsh, David O; Grunewald, Elliot D

2013-11-12T23:59:59.000Z

422

Simple ocean carbon cycle models  

SciTech Connect

Simple ocean carbon cycle models can be used to calculate the rate at which the oceans are likely to absorb CO{sub 2} from the atmosphere. For problems involving steady-state ocean circulation, well calibrated ocean models produce results that are very similar to results obtained using general circulation models. Hence, simple ocean carbon cycle models may be appropriate for use in studies in which the time or expense of running large scale general circulation models would be prohibitive. Simple ocean models have the advantage of being based on a small number of explicit assumptions. The simplicity of these ocean models facilitates the understanding of model results.

Caldeira, K. [Lawrence Livermore National Lab., CA (United States); Hoffert, M.I. [New York Univ., NY (United States). Dept. of Earth System Sciences; Siegenthaler, U. [Bern Univ. (Switzerland). Inst. fuer Physik

1994-02-01T23:59:59.000Z

423

Closed cycle liquid helium refrigerators  

Science Journals Connector (OSTI)

We have developed closed cycle liquid helium refrigerators using a Joule Thomson circuit precooled by commercially available two staged Gifford Mac Mahon cryocoolers. The Joule Thomson counterflow heat exchangers are modular and have been thermo-hydraulically characterized. Fully automatic cool down and operation are achieved by two pneumatically driven by pass and expansion valves. Several apparatus have been built or are under assembly with cooling power ranging from 100 mW up to 5 Watt, for temperature ranging from 2.8 K up to 4.5 K. A trouble free operation with several warm up and cool down cycles has been proven over 7000 hours.

G. Claudet; R. Lagnier; A. Ravex

1992-01-01T23:59:59.000Z

424

GAX absorption cycle design process  

SciTech Connect

This paper presents an absorption system design process that relies on computer simulations that are validated by experimental findings. An ammonia-water absorption heat pump cycle at 3 refrigeration tons (RT) and chillers at 3.3 RT and 5 RT (10.5 kW, 11.6 kW, and 17.6 kW) were initially modeled and then built and tested. The experimental results were used to calibrate both the cycle simulation and the component simulations, yielding computer design routines that could accurately predict component and cycle performance. Each system was a generator-absorber heat exchange (GAX) cycle, and all were sized for residential and light commercial use, where very little absorption equipment is currently used. The specific findings of the 5 RT (17.6 kW) chiller are presented. Modeling incorporated a heat loss from the gas-fired generator and pressure drops in both the evaporator and absorber. Simulation results and experimental findings agreed closely and validated the modeling method and simulation software.

Priedeman, D.K.; Christensen, R.N.

1999-07-01T23:59:59.000Z

425

Small solar (thermal) water-pumping system  

SciTech Connect

A small solar (thermal) water pump phototype was tested. The pump works on an organic Rankine cycle using refrigerant R113. The design of the pump is described. Detailed temperature and pressure measurements of the working fluid for different operating conditions are performed. The behaviour of the cycle is analysed to get a clear picture of the thermodynamic process. Power-characteristic curves are obtained by a systematic variation of water temperature, pumping head and heat input. 10 refs., 13 figs., 2 tabs.

Spindler, K.; Hahne, E. [Universitaet Stuttgart (Germany)] [Universitaet Stuttgart (Germany); Chandwalker, K. [Stiletto Engineers, Hyderabad (India)] [Stiletto Engineers, Hyderabad (India)

1996-07-01T23:59:59.000Z

426

NREL: U.S. Life Cycle Inventory Database - Life Cycle Assessments  

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

Life Cycle Assessments A life cycle assessment (LCA) is a systematic, cradle-to-grave process that evaluates the environmental impacts of products, processes, and services. Its...

427

Medium Truck Duty Cycle (MTDC)  

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

Routes Data Acquisition System Setup Routes Data Acquisition System Setup Medium Truck Duty Cycle (MTDC) Objective This Department of Energy project focuses on the collection and analysis medium truck (Class-6 and -7) duty cycle data from real-world operations. Analysis of this data will provide information pertaining to the fuel efficiencies and performance of medium trucks in several vocations. Outcomes Rich source of data and information that can contribute to the development of new tools Sound basis upon which DOE can make technology investment decisions A national archive of real-world-based medium-truck operational data that will support medium-duty vehicle energy efficiency research Collected Data Speed & Acceleration Fuel Consumption GPS Location Road Grade

428

The Life Cycle Analysis Toolbox  

SciTech Connect

The life cycle analysis toolbox is a valuable integration of decision-making tools and supporting materials developed by Oak Ridge National Laboratory (ORNL) to help Department of Energy managers improve environmental quality, reduce costs, and minimize risk. The toolbox provides decision-makers access to a wide variety of proven tools for pollution prevention (P2) and waste minimization (WMin), as well as ORNL expertise to select from this toolbox exactly the right tool to solve any given P2/WMin problem. The central element of the toolbox is a multiple criteria approach to life cycle analysis developed specifically to aid P2/WMin decision-making. ORNL has developed numerous tools that support this life cycle analysis approach. Tools are available to help model P2/WMin processes, estimate human health risks, estimate costs, and represent and manipulate uncertainties. Tools are available to help document P2/WMin decision-making and implement programs. Tools are also available to help track potential future environmental regulations that could impact P2/WMin programs and current regulations that must be followed. An Internet-site will provide broad access to the tools.

Bishop, L.; Tonn, B.E.; Williams, K.A.; Yerace, P.; Yuracko, K.L.

1999-02-28T23:59:59.000Z

429

ORGANIC CHEMISTRY UCLA Organic Chemistry Faculty  

E-Print Network (OSTI)

ORGANIC CHEMISTRY UCLA Organic Chemistry Faculty perform research in molecular machines, exotic CHEMISTRY FACULTY RESEARCH INTERESTS Anne M. Andrews, Professor-in-Residence: Understanding how areas of interest include cross- coupling reactions, green chemistry, heterocycle synthesis, and natural

Levine, Alex J.

430

The Quebec Life Cycle Inventory Database Project  

Science Journals Connector (OSTI)

Life cycle assessment (LCA) in Quebec (Canada) is increasingly important. Yet, ... life cycle inventory (LCI) data. The Quebec government invested in the creation of a Quebec LCI database. The approach is to work...

Pascal Lesage; Réjean Samson

2013-05-01T23:59:59.000Z

431

Profit cycle dynamics by Kawika Pierson.  

E-Print Network (OSTI)

My thesis consists of three essays investigating the existence, causes, and mitigation of profit cycles at an industry level. The first essay examines profit cycles by proposing that the industry-specific features of how ...

Pierson, Kawika (Kawika Paul)

2011-01-01T23:59:59.000Z

432

Rethinking the light water reactor fuel cycle  

E-Print Network (OSTI)

The once through nuclear fuel cycle adopted by the majority of countries with operating commercial power reactors imposes a number of concerns. The radioactive waste created in the once through nuclear fuel cycle has to ...

Shwageraus, Evgeni, 1973-

2004-01-01T23:59:59.000Z

433

Viable combined cycle design for automotive applications  

Science Journals Connector (OSTI)

A relatively new approach for improving fuel economy and automotive engine performance involves the use of automotive combined cycle generation technologies. The combined cycle generation, a process widely used i...

K. -B. Kim; K. -W. Choi; K. -H. Lee

2012-04-01T23:59:59.000Z

434

Coal-Fuelled Combined Cycle Power Plants  

Science Journals Connector (OSTI)

Combined cycle power plant, when used as a generic ... which converts heat into mechanical energy in a combined gas and steam turbine process. Combined cycle processes with coal gasification or coal combustion .....

Dr. Hartmut Spliethoff

2010-01-01T23:59:59.000Z

435

Toward single-cycle optical pulses  

E-Print Network (OSTI)

Single-cycle optical pulses, the never-before-achieved regime, have a great potential for attosecond science and phase-sensitive nonlinear optics. To achieve single-cycle optical pulses by active synchronization, three ...

Kim, Jung-Won, 1976-

2004-01-01T23:59:59.000Z

436

Development Plan for the Fuel Cycle Simulator  

SciTech Connect

The Fuel Cycle Simulator (FCS) project was initiated late in FY-10 as the activity to develop a next generation fuel cycle dynamic analysis tool for achieving the Systems Analysis Campaign 'Grand Challenge.' This challenge, as documented in the Campaign Implementation Plan, is to: 'Develop a fuel cycle simulator as part of a suite of tools to support decision-making, communication, and education, that synthesizes and visually explains the multiple attributes of potential fuel cycles.'

Brent Dixon

2011-09-01T23:59:59.000Z

437

Nuclear Power Generation and Fuel Cycle Report 1996  

Gasoline and Diesel Fuel Update (EIA)

6) 6) Distribution Category UC-950 Nuclear Power Generation and Fuel Cycle Report 1996 October 1996 Energy Information Administration Office of Coal, Nuclear, Electric and Alternate Fuels U.S. Department of Energy Washington, DC 20585 This report was prepared by the Energy Information Administration, the independent statistical and analytical agency within the Department of Energy. The information contained herein should not be construed as advocating or reflecting any policy position of the Department of Energy or of any other organization. Energy Information Administration/ Nuclear Power Generation and Fuel Cycle Report 1996 ii Contacts This report was prepared in the Office of Coal, Nuclear, report should be addressed to the following staff Electric and Alternate Fuels by the Analysis and Systems

438

Using Cycles and Scaling Parallel Algorithms  

E-Print Network (OSTI)

graph by finding a max­ imal set of edge­disjoint cycles. We give a parallel algorithm to find the first efficient parallel algorithm for finding an approximation to a min­ imum cycle cover. Our algorithm finds a cycle cover whose size is within a factor of O(1 + n log n m+n ) of the minimum sized

Yang, Junfeng

439

How Minds Work The IDA Cognitive Cycle  

E-Print Network (OSTI)

1 How Minds Work The IDA Cognitive Cycle Stan Franklin Computer Science Division & Institute for Intelligent Systems The University of Memphis #12;HMW: The IDA Cognitive Cycle 2 Memory Systems #12;HMW: The IDA Cognitive Cycle 3 Global Workspace Theory I · The nervous system is a distributed parallel

Memphis, University of

440

SPACETELESCOPESCIENCEINSTITUTE WFPC2 Cycle 14 Calibration  

E-Print Network (OSTI)

/chip combinations used for science in Cycle 14 + Close Out ~10% reserve 2 Placeholder for unexpected items. TOTALSPACETELESCOPESCIENCEINSTITUTE WFPC2 Cycle 14 Calibration Director's Review 8 August 2005 John Biretta 1 Cycle 14 WFPC2 Calibration Plan Overall Goals: · Monitor & maintain WFPC2 health & safety

Sirianni, Marco

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


441

NREL: TroughNet - Parabolic Trough Power Plant System Technology  

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

Parabolic Trough Power Plant System Technology Parabolic Trough Power Plant System Technology A parabolic trough solar power plant uses a large field of collectors to supply thermal energy to a conventional power plant. Because they use conventional power cycles, parabolic trough power plants can be hybridized-other fuels can be used to back up the solar power. Like all power cycles, trough power plants also need a cooling system to transfer waste heat to the environment. Parabolic trough power plant technologies include: Direct steam generation Fossil-fired (hybrid) backup Operation and maintenance Power cycles Steam Rankine Organic Rankine Combined Wet and dry cooling Power Cycles A photo of an aerial view of a power plant in the middle of a solar field with rows and rows of parabolic troughs tracking. The cooling towers can be seen with the water plume rising into the air. The white water tanks can be seen in the background.

442

Organization | Department of Energy  

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

Organization Organization The Office of Economic Impact and Diversity is comprised of: The Office of the Director- contact us Office of Minority Business and Economic Development -...

443

Building Life Cycle Cost Programs | Department of Energy  

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

Building Life Cycle Cost Programs Building Life Cycle Cost Programs The National Institute of Standards and Technology (NIST) developed the Building Life Cycle Cost (BLCC) Program...

444

Life Cycle Assessment Comparing the Use of Jatropha Biodiesel...  

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

on Climate Change IR Indian Railways Jatropha Jatropha curcas L. KCl potassium chloride LCA life cycle assessment LCI life cycle inventory LCIA life cycle impact assessment MSRTH...

445

Advanced Fuel Cycle Economic Sensitivity Analysis  

SciTech Connect

A fuel cycle economic analysis was performed on four fuel cycles to provide a baseline for initial cost comparison using the Gen IV Economic Modeling Work Group G4 ECON spreadsheet model, Decision Programming Language software, the 2006 Advanced Fuel Cycle Cost Basis report, industry cost data, international papers, the nuclear power related cost study from MIT, Harvard, and the University of Chicago. The analysis developed and compared the fuel cycle cost component of the total cost of energy for a wide range of fuel cycles including: once through, thermal with fast recycle, continuous fast recycle, and thermal recycle.

David Shropshire; Kent Williams; J.D. Smith; Brent Boore

2006-12-01T23:59:59.000Z

446

MHD Integrated Topping Cycle Project  

SciTech Connect

This eighteenth quarterly technical progress report of the MHD Integrated Topping cycle Project presents the accomplishments during the period November 1, 1991 to January 31, 1992. The precombustor is fully assembled. Manufacturing of all slagging stage components has been completed. All cooling panels were welded in place and the panel/shell gap was filled with RTV. Final combustor assembly is in progress. The low pressure cooling subsystem (LPCS) was delivered to the CDIF. Second stage brazing issues were resolved. The construction of the two anode power cabinets was completed.

Not Available

1992-07-01T23:59:59.000Z

447

OECD/NEA Ongoing activities related to the nuclear fuel cycle  

SciTech Connect

As part of its role in encouraging international collaboration, the OECD Nuclear Energy Agency is coordinating a series of projects related to the Nuclear Fuel Cycle. The Nuclear Science Committee (NSC) Working Party on Scientific Issues of the Nuclear Fuel Cycle (WPFC) comprises five different expert groups covering all aspects of the fuel cycle from front to back-end. Activities related to fuels, materials, physics, separation chemistry, and fuel cycles scenarios are being undertaken. By publishing state-of-the-art reports and organizing workshops, the groups are able to disseminate recent research advancements to the international community. Current activities mainly focus on advanced nuclear systems, and experts are working on analyzing results and establishing challenges associated to the adoption of new materials and fuels. By comparing different codes, the Expert Group on Advanced Fuel Cycle Scenarios is aiming at gaining further understanding of the scientific issues and specific national needs associated with the implementation of advanced fuel cycles. At the back end of the fuel cycle, separation technologies (aqueous and pyrochemical processing) are being assessed. Current and future activities comprise studies on minor actinides separation and post Fukushima studies. Regular workshops are also organized to discuss recent developments on Partitioning and Transmutation. In addition, the Nuclear Development Committee (NDC) focuses on the analysis of the economics of nuclear power across the fuel cycle in the context of changes of electricity markets, social acceptance and technological advances and assesses the availability of the nuclear fuel and infrastructure required for the deployment of existing and future nuclear power. The Expert Group on the Economics of the Back End of the Nuclear Fuel Cycle (EBENFC), in particular, is looking at assessing economic and financial issues related to the long term management of spent nuclear fuel. (authors)

Cornet, S.M. [OECD Nuclear Energy Agency, 12 Boulevard des Iles, 92130 Issy-les-Moulineaux (France); McCarthy, K. [Idaho Nat. Lab. - P.O. Box 1625, Idaho Falls, ID 83415-3860 (United States); Chauvin, N. [CEA Saclay, Nuclear Energy Division, 91191 Gif/Yvette (France)

2013-07-01T23:59:59.000Z

448

Fuel Cycle CrossCut Group  

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

CrossCut Group CrossCut Group 1 NERAC Briefing: Assessment of Dose of Closed vs Open Gen-IV Fuel Cycles David Wade NERAC Meeting September 30, 2002 Fuel Cycle CrossCut Group 2 Public Dose and Worker Dose Comparison of Open vs Closed Fuel Cycles * Gen-IV fuel cycle options are meant to address all stated Gen-IV Goals - Dose to workers and to the public is one of the numerous elements to be evaluated by Gen-IV R&D - The Fuel Cycle Crosscut Group was assigned to take an early look at dose implication tradeoffs of open and closed fuel cycles * FCCG Interpretation of Assignment: - Collect already-existing evaluations and prepare a briefing on what is currently known Fuel Cycle CrossCut Group 3 Approach * Look at Actual Historical Doses Based on Operational Experience - Data compiled by the United Nations Scientific Committee on the Effects of Atomic

449

VISION: Verifiable Fuel Cycle Simulation Model  

SciTech Connect

The nuclear fuel cycle is a very complex system that includes considerable dynamic complexity as well as detail complexity. In the nuclear power realm, there are experts and considerable research and development in nuclear fuel development, separations technology, reactor physics and waste management. What is lacking is an overall understanding of the entire nuclear fuel cycle and how the deployment of new fuel cycle technologies affects the overall performance of the fuel cycle. The Advanced Fuel Cycle Initiative’s systems analysis group is developing a dynamic simulation model, VISION, to capture the relationships, timing and delays in and among the fuel cycle components to help develop an understanding of how the overall fuel cycle works and can transition as technologies are changed. This paper is an overview of the philosophy and development strategy behind VISION. The paper includes some descriptions of the model and some examples of how to use VISION.

Jacob J. Jacobson; Abdellatif M. Yacout; Gretchen E. Matthern; Steven J. Piet; David E. Shropshire

2009-04-01T23:59:59.000Z

450

Definition: Brayton cycle | Open Energy Information  

Open Energy Info (EERE)

form form View source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Definition Edit with form History Facebook icon Twitter icon » Definition: Brayton cycle Jump to: navigation, search Dictionary.png Brayton cycle A thermodynamic cycle using constant pressure, heat addition and rejection. Fuel and a compressor are used to heat and increase the pressure of a gas; the gas expands and spins the blades of a turbine, which, when connected to a generator, generates electricity.[1][2] View on Wikipedia Wikipedia Definition The Brayton cycle is a thermodynamic cycle that describes the workings of a constant pressure heat engine. Gas turbine engines and airbreathing jet engines use the Brayton Cycle. Although the Brayton cycle

451

Fuel Cycle Research and Development Program  

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

Development Program Presentation to Office of Environmental Management Tank Waste Corporate Board James C. Bresee, ScD, JD Advisory Board Member Office of Nuclear Energy July 29, 2009 July 29, 2009 Fuel Cycle Research and Development DM 195665 2 Outline Fuel Cycle R&D Mission Changes from the Former Advanced Fuel Cycle Initiative The Science-Based Approach Key Collaborators Budget History Program Elements Summary July 29, 2009 Fuel Cycle Research and Development DM 195665 3 Fuel Cycle R&D Mission The mission of Fuel Cycle Research and Development is to develop options to current fuel cycle management strategy to enable the safe, secure, economic, and sustainable expansion of nuclear energy while reducing proliferation risks by conducting

452

MHD Integrated Topping Cycle Project  

SciTech Connect

The overall objective of the project is to design and construct prototypical hardware for an integrated MHD topping cycle, and conduct long duration proof-of-concept tests of integrated system at the US DOE Component Development and Integration Facility in Butte, Montana. The results of the long duration tests will augment the existing engineering design data base on MHD power train reliability, availability, maintainability, and performance, and will serve as a basis for scaling up the topping cycle design to the next level of development, an early commercial scale power plant retrofit. The components of the MHD power train to be designed, fabricated, and tested include: A slagging coal combustor with a rated capacity of 50 MW thermal input, capable of operation with an Eastern (Illinois {number sign}6) or Western (Montana Rosebud) coal, a segmented supersonic nozzle, a supersonic MHD channel capable of generating at least 1.5 MW of electrical power, a segmented supersonic diffuser section to interface the channel with existing facility quench and exhaust systems, a complete set of current control circuits for local diagonal current control along the channel, and a set of current consolidation circuits to interface the channel with the existing facility inverter.

Not Available

1992-01-01T23:59:59.000Z

453

MHD Integrated Topping Cycle Project  

SciTech Connect

The Magnetohydrodynamics (MHD) Integrated Topping Cycle (ITC) Project represents the culmination of the proof-of-concept (POC) development stage in the US Department of Energy (DOE) program to advance MHD technology to early commercial development stage utility power applications. The project is a joint effort, combining the skills of three topping cycle component developers: TRW, Avco/TDS, and Westinghouse. TRW, the prime contractor and system integrator, is responsible for the 50 thermal megawatt (50 MW{sub t}) slagging coal combustion subsystem. Avco/TDS is responsible for the MHD channel subsystem (nozzle, channel, diffuser, and power conditioning circuits), and Westinghouse is responsible for the current consolidation subsystem. The ITC Project will advance the state-of-the-art in MHD power systems with the design, construction, and integrated testing of 50 MW{sub t} power train components which are prototypical of the equipment that will be used in an early commercial scale MHD utility retrofit. Long duration testing of the integrated power train at the Component Development and Integration Facility (CDIF) in Butte, Montana will be performed, so that by the early 1990's, an engineering data base on the reliability, availability, maintainability and performance of the system will be available to allow scaleup of the prototypical designs to the next development level. This Sixteenth Quarterly Technical Progress Report covers the period May 1, 1991 to July 31, 1991.

Not Available

1992-03-01T23:59:59.000Z

454

Transportation Organization and Functions  

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

Office of Packaging and Transportation list of organizations and functions, with a list of acronyms.

455

The Seasonal Cycle over the United States and Mexico  

Science Journals Connector (OSTI)

The annual cycle occupies a unique position in the spectra of meteorological time series. This cycle and its first three harmonics are extracted from the series as a seasonal cycle. The distributions of the annual and seasonal cycles are studied ...

Vernon E. Kousky; S. Srivatsangam

1983-01-01T23:59:59.000Z

456

Assessment of the type of cycling infrastructure required to attract new  

Open Energy Info (EERE)

Assessment of the type of cycling infrastructure required to attract new Assessment of the type of cycling infrastructure required to attract new cyclists Jump to: navigation, search Tool Summary Name: Assessment of the type of cycling infrastructure required to attract new cyclists Agency/Company /Organization: New Zealand Transport Agency Focus Area: Non-Motorized Transport Topics: Analysis Tools Complexity/Ease of Use: Not Available Website: www.nzta.govt.nz/resources/research/reports/449/ Transport Toolkit Region(s): Australia/North America Related Tools Petroleum Reduction Planning Tool New Videos: Stories of Auto-Rickshaws in India Ethanol Usage in Urban Public Transportation - Presentation of Results ... further results Find Another Tool FIND TRANSPORTATION TOOLS Investigated what type of cycling infrastructure would encourage 'new

457

MHD Integrated Topping Cycle Project  

SciTech Connect

This seventeenth quarterly technical progress report of the MHD Integrated Topping Cycle Project presents the accomplishments during the period August 1, 1991 to October 31, 1991. Manufacturing of the prototypical combustor pressure shell has been completed including leak, proof, and assembly fit checking. Manufacturing of forty-five cooling panels was also completed including leak, proof, and flow testing. All precombustor internal components (combustion can baffle and swirl box) were received and checked, and integration of the components was initiated. A decision was made regarding the primary and backup designs for the 1A4 channel. The assembly of the channel related prototypical hardware continued. The cathode wall electrical wiring is now complete. The mechanical design of the diffuser has been completed.

Not Available

1992-07-01T23:59:59.000Z

458

Efficiency combined cycle power plant  

SciTech Connect

This patent describes a method of operating a combined cycle power plant. It comprises: flowing exhaust gas from a combustion turbine through a heat recovery steam generator (HRSG); flowing feed water through an economizer section of the HRSG at a flow rate and providing heated feed water; flowing a first portion of the heated feed water through an evaporator section of the HRSG and producing saturated steam at a production rate, the flow rate of the feed water through the economizer section being greater than required to sustain the production rate of steam in the evaporator section; flowing fuel for the turbine through a heat exchanger; and, flowing a second portion of the heated feed water provided by the economizer section through the heat exchanger then to an inlet of the economizer section, thereby heating the fuel flowing through the heat exchanger.

Pavel, J.; Meyers, G.A.; Baldwin, T.S.

1990-06-12T23:59:59.000Z

459

2D representation of life cycle greenhouse gas emission and life cycle cost of energy conversion for various energy resources  

Science Journals Connector (OSTI)

We suggest a 2D-plot representation combined with life cycle greenhouse gas (GHG) emissions and life cycle cost for various energy conversion technologies. In general, life cycle ... use life cycle GHG emissions ...

Heetae Kim; Claudio Tenreiro; Tae Kyu Ahn

2013-10-01T23:59:59.000Z

460

Nuclear Fuel Cycle | Department of Energy  

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

Cycle Cycle Nuclear Fuel Cycle This is an illustration of a nuclear fuel cycle that shows the required steps to process natural uranium from ore for preparation for fuel to be loaded in nuclear reactors. This is an illustration of a nuclear fuel cycle that shows the required steps to process natural uranium from ore for preparation for fuel to be loaded in nuclear reactors. The mission of NE-54 is primarily focused on activities related to the front end of the nuclear fuel cycle which includes mining, milling, conversion, and enrichment. Uranium Mining Both "conventional" open pit, underground mining, and in situ techniques are used to recover uranium ore. In general, open pit mining is used where deposits are close to the surface and underground mining is used

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


461

NREL: Energy Analysis - Life Cycle Assessment Harmonization  

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

Life Cycle Assessment Harmonization Life Cycle Assessment Harmonization Life Cycle Greenhouse Gas Emissions from Electricity Generation (Fact Sheet) Cover of the Life Cycle Greenhouse Gas Emissions from Electricity Generation factsheet Download the Fact Sheet The U.S. Department of Energy enlisted NREL to review and "harmonize" life cycle assessments (LCA) of electricity generation technologies. Hundreds of assessments have been published, often with considerable variability in results. These variations in approach, while usually legitimate, hamper comparison across studies and pooling of published results. Learn more about life cycle assessments of energy technologies. By harmonizing this data, NREL seeks to reduce the uncertainty around estimates for environmental impacts of renewables and increase the value of

462

Definition: Thermodynamic cycle | Open Energy Information  

Open Energy Info (EERE)

Thermodynamic cycle Thermodynamic cycle Jump to: navigation, search Dictionary.png Thermodynamic cycle A process in which a fluid (water, air, ammonia, etc) successively changes state (from a liquid to a gas and back to a liquid) for the purpose of producing or transferring energy.[1] View on Wikipedia Wikipedia Definition A thermodynamic cycle consists of a collection of thermodynamic processes transferring heat and work, while varying pressure, temperature, and other state variables, eventually returning a system to its initial state. In the process of going through this cycle, the system may perform work on its surroundings, therefore acting as a heat engine. State quantities depend only on the thermodynamic state, and cumulative variation of such properties adds up to zero during a cycle. Process quantities (or

463

LARSON--MATH 556--CLASSROOM WORKSHEET 07 Hamilton Cycles  

E-Print Network (OSTI)

Last name First name LARSON--MATH 556--CLASSROOM WORKSHEET 07 Hamilton Cycles An alternating-cycle. A cycle which includes every point of a graph G is called a Hamilton cycle of G. 1. Draw the complete graph K5. Find one Hamilton cycle in K5. 2. Does every complete graph have a Hamilton cycle? Explain. 3

Larson, Craig E.

464

Biogeochemical cycling in an organic-rich coastal marine basin: 11. The sedimentary cycling of dissolved, free amino acids  

SciTech Connect

In the anoxic sediments of Cape Lookout Bight, NC, concentrations of total dissolved free amino acids (TDFAAs) are highest near the sediment-water interface, and decrease to non-zero, asymptotic concentrations at depths greater than 20 cm. TDFAAs in the overlying waters are <1 {mu}M. Dissolved free amino acid (DFAA) profiles often show a secondary subsurface maximum in the region between the 1 and 5 mM sulfate isopleths. This phenomenon appears to be related to the transition in the sediments of this region from sulfate reduction to methanogenesis. A steady-state diagenetic model which quantifies the processes affecting DFAAs in these sediments yields rates of DFAA production and consumption that agree reasonably well with independent estimates of these quantities in Cape Lookout Bight and other anoxic marine sediments. The combined results of modelling pore water DFAA and sedimentary amino acid profiles indicate that significant exchange of amino acids occurs between the sediments and pore waters. These results demonstrate that the biogeochemistry of dissolved free amino acids in the pore waters of Cape Lookout Bight sediments is dominated by internal transformations (i.e. production from sedimentary amino acids, microbial remineralization, and reincorporation back into the sediments). There is some uncertainty in the magnitude of the flux of DFAAs across the sediment-water interface, although it appears to be of secondary importance when compared to the other sedimentary processes affecting DFAAs.

Burdige, D.J.; Martens, C.S. (Univ. of North Carolina, Chapel Hill (USA))

1990-11-01T23:59:59.000Z

465

PCM energy storage during defective thermal cycling:.  

E-Print Network (OSTI)

??Incomplete thermal cycling affects storage capacities of phase change materials (PCMs). Existing PCM measuring methods are presented with their drawbacks. A new device named “the… (more)

Koekenbier, S.F.

2011-01-01T23:59:59.000Z

466

Life Cycle Assessment of Biomass Conversion Pathways.  

E-Print Network (OSTI)

??This study has investigated the life cycle of three biomass feedstocks including forest residue, agricultural residue, and whole forest for biohydrogen and biopower production in… (more)

Kabir, Md R

2012-01-01T23:59:59.000Z

467

Variable pressure power cycle and control system  

DOE Patents (OSTI)

A variable pressure power cycle and control system that is adjustable to a variable heat source is disclosed. The power cycle adjusts itself to the heat source so that a minimal temperature difference is maintained between the heat source fluid and the power cycle working fluid, thereby substantially matching the thermodynamic envelope of the power cycle to the thermodynamic envelope of the heat source. Adjustments are made by sensing the inlet temperature of the heat source fluid and then setting a superheated vapor temperature and pressure to achieve a minimum temperature difference between the heat source fluid and the working fluid.

Goldsberry, Fred L. (Spring, TX)

1984-11-27T23:59:59.000Z

468

Tropical Cloud Life Cycle and Overlap Structure  

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

Tropical Cloud Life Cycle and Overlap Structure Vogelmann, Andrew Brookhaven National Laboratory Jensen, Michael Brookhaven National Laboratory Kollias, Pavlos Brookhaven National...

469

Splitting the Cycle the Right Way  

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

The unique opposed-cylinder configuration of the TourEngine allows superior thermal management and efficient gas transfer compared to other split-cycle designs.

470

Fuel Cycle Research and Development Program  

Office of Environmental Management (EM)

29, 2009 Fuel Cycle Research and Development DM 195665 5 Identify the governing phenomenology Identify the governing phenomenology Develop a first-principle based model of the...

471

Microbial Carbon Cycling in Permafrost-Affected Soils  

SciTech Connect

The Arctic plays a key role in Earth s climate system as global warming is predicted to be most pronounced at high latitudes and because one third of the global carbon pool is stored in ecosystems of the northern latitudes. In order to improve our understanding of the present and future carbon dynamics in climate sensitive permafrost ecosystems, present studies concentrate on investigations of microbial controls of greenhouse gas fluxes, on the activity and structure of the involved microbial communities, and on their response to changing environmental conditions. Permafrost-affected soils can function as both a source and a sink for carbon dioxide and methane. Under anaerobic conditions, caused by flooding of the active layer and the effect of backwater above the permafrost table, the mineralization of organic matter can only be realized stepwise by specialized microorganisms. Important intermediates of the organic matter decomposition are hydrogen, carbon dioxide and acetate, which can be further reduced to methane by methanogenic archaea. Evolution of methane fluxes across the subsurface/atmosphere boundary will thereby strongly depend on the activity of anaerobic methanogenic archaea and obligately aerobic methane oxidizing proteobacteria, which are known to be abundant and to significantly reduce methane emissions in permafrost-affected soils. Therefore current studies on methane-cycling microorganisms are the object of particular attention in permafrost studies, because of their key role in the Arctic methane cycle and consequently of their significance for the global methane budget.

Vishnivetskaya, T. [University of Tennessee, Knoxville (UTK); Liebner, Susanne [University of Tromso, Norway; Wilhelm, Ronald [McGill University, Montreal, Quebec; Wagner, Dirk [Alfred Wegener Institute for Polar and Marine Research, Potsdam, Germany

2011-01-01T23:59:59.000Z

472

Mixed crystal organic scintillators  

DOE Patents (OSTI)

A mixed organic crystal according to one embodiment includes a single mixed crystal having two compounds with different bandgap energies, the organic crystal having a physical property of exhibiting a signal response signature for neutrons from a radioactive source, wherein the signal response signature does not include a significantly-delayed luminescence characteristic of neutrons interacting with the organic crystal relative to a luminescence characteristic of gamma rays interacting with the organic crystal. According to one embodiment, an organic crystal includes bibenzyl and stilbene or a stilbene derivative, the organic crystal having a physical property of exhibiting a signal response signature for neutrons from a radioactive source.

Zaitseva, Natalia P; Carman, M Leslie; Glenn, Andrew M; Hamel, Sebastien; Hatarik, Robert; Payne, Stephen A; Stoeffl, Wolfgang

2014-09-16T23:59:59.000Z

473

Chlorinated hydrocarbon cycling in the benthic nepheloid layer of Lake Superior  

SciTech Connect

The dynamics and composition of the benthic nepheloid layer (BNL) in western Lake Superior were studied with respect to the cycling of trace hydrophobic organic compounds. The BNL was enriched in t-PCB, p,p'-DDE, and hexachlorobenzene (HCB) but deficient in dissolved organic carbon relative to surface waters. Resuspension events in midsummer resulted in a 50% increase in the PCB burden in the water column. Seasonal cycling of PCB congeners was strongly dependent on their degree of chlorination, with heavier chlorinated congeners lost from the water column (t/sub 1/2/ = 17-28 days at two sites). Steady-state t-PCB concentrations in the BNL were maintained over the summer by transport of lighter chlorinated congeners from the underlying sediments. DDE is an effective tracer of sediment resuspension in Lake Superior. Recycling of trace organic pollutants in the BNL serves to increase their resident times in the lake.

Baker, J.E.; Elsenreich, S.J.; Johnson, T.C.; Halfman, B.M.

1985-09-01T23:59:59.000Z

474

The influence of lateral foot displacement on cycling efficiency and maximal cycling power.  

E-Print Network (OSTI)

??HARPER, SARA A., M.S., May 2014Exercise PhysiologyTHE INFLUENCE OF LATERAL PEDAL DISPLACEMENT ON CYCLING EFFICIENCY AND MAXIMAL CYCLING POWER (27 pp.)Director of Thesis: John McDaniel,… (more)

Harper, Sara Anne

2014-01-01T23:59:59.000Z

475

Moving toward multilateral mechanisms for the fuel cycle  

SciTech Connect

Multilateral mechanisms for the fuel cycle are seen as a potentially important way to create an industrial infrastructure that will support a renaissance and at the same time not contribute to the risk of nuclear proliferation. In this way, international nuclear fuel cycle centers for enrichment can help to provide an assurance of supply of nuclear fuel that will reduce the likelihood that individual states will pursue this sensitive technology, which can be used to produce nuclear material directly usable nuclear weapons. Multinational participation in such mechanisms can also potentially promote transparency, build confidence, and make the implementation of IAEA safeguards more effective or more efficient. At the same time, it is important to ensure that there is no dissemination of sensitive technology. The Russian Federation has taken a lead role in this area by establishing an International Uranium Enrichment Center (IUEC) for the provision of enrichment services at its uranium enrichment plant located at the Angarsk Electrolysis Chemical Complex (AECC). This paper describes how the IUEe is organized, who its members are, and the steps that it has taken both to provide an assured supply of nuclear fuel and to ensure protection of sensitive technology. It also describes the relationship between the IUEC and the IAEA and steps that remain to be taken to enhance its assurance of supply. Using the IUEC as a starting point for discussion, the paper also explores more generally the ways in which features of such fuel cycle centers with multinational participation can have an impact on safeguards arrangements, transparency, and confidence-building. Issues include possible lAEA safeguards arrangements or other links to the IAEA that might be established at such fuel cycle centers, impact of location in a nuclear weapon state, and the transition by the IAEA to State Level safeguards approaches.

Panasyuk,A.; Rosenthal,M.; Efremov, G. V.

2009-04-17T23:59:59.000Z

476

CX-002111: Categorical Exclusion Determination | Department of Energy  

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

11: Categorical Exclusion Determination 11: Categorical Exclusion Determination CX-002111: Categorical Exclusion Determination Optimization of Hybrid-Water/Air-Cooled Condenser In an Enhanced Turbine Geothermal Organic Rankine Cycle System CX(s) Applied: B3.6, A9 Date: 05/05/2010 Location(s): East Hartford, CT Office(s): Energy Efficiency and Renewable Energy, Golden Field Office United Technologies Research Center (UTRC) would develop a hybrid water/air cooled condenser and an enhanced turbine for geothermal-based Organic Rankine Cycle (ORC) power production systems. Project work would take place in three locations: UTRC's ORC lab in East Hartford, CT; the Power plant laboratory at Chena Hot Springs Resort in Alaska; and the Mechanical Engineering Laboratory at the University of Illinois at Urbana-Champaign.

477

Overview of international R and D programs on ORC systems  

SciTech Connect

The use of organic fluids in Rankine cycles has the potential for economically generating electric power from waste heat sources at lower temperatures than would be practical using steam systems. This paper reviews the current status of organic Rankine cycle (ORC) research and development in the United States, Europe, and Japan. Some of the problems being addressed are optimal working fluid selection, design of the nozzle/turbine assembly, and design of the vaporizer. Commercially available ORC engines range in size from 300 kW to 1,500 kW, while demonstration units start in the 30-40 kW range. Most applications to date have utilized the waste heat available in the exhaust gas of diesel engines and oil refinery furnaces. Although the focus of R and D work to date has been the technological aspects of ORCs, the economics must also be proven attractive if the systems are to penetrate the market.

Streicher, A.; Kapner, M.

1982-08-01T23:59:59.000Z

478

Semitransparent organic solar cells  

Science Journals Connector (OSTI)

The organic solar cell technology has attracted great interests due to ... low cost solution process capability. Bulk heterojunction organic solar cells offer a potentially much cheaper alternative way to harness...

Furong Zhu

2014-03-01T23:59:59.000Z

479

These Principles are the roots from which organic agriculture grows and develops. They express the contribution that organic  

E-Print Network (OSTI)

agriculture should attain ecological balance through the design of farming systems, establishment of habitats ecological systems and cycles, work with them, emulate them and help sustain them. This principle roots organic agriculture within living ecological systems. It states that production is to be based

Wang, Changlu

480

S and H Cycle Engine  

SciTech Connect

Our thirst for energy is increasing at an astounding rate. World population growth is estimated to increase by 40% (to 8.5 billion) by 2050, with annual electrical energy usage estimated increase by 100% (to 25 terawatt-hours). We must find new means and fuels as well as significantly improve the efficiency of current power plants to accommodate this growing electrical energy demand. This demand is also growing in the field of space flight. Present energy and propulsion systems are limited in the amount of power (energy) that can be generated by today's technology. This limits the distance that can be safely traveled by manned and un-manned space systems. Space flight is primarily governed by two factors: time and energy. Increasing energy of space propulsion systems will decrease flight time or allow reaching farther out into space safely for manned exploration of our solar system. For example, a round trip manned mission to Mars would take about 400 days with a NERVA type thermal nuclear rocket. To reduce the 400 days to 80 days would require an increase of energy by a factor of five. We need to develop space propulsion systems with much greater energy capability than we have today to satisfy the expansion of space exploration. The S and H Cycle nuclear engine provides a revolutionary technological approach that can contribute significantly toward solving the World electrical energy and the space travel energy requirements. (authors)

Strobl, William C. [2906 Via Pepita, Carlsbad, Ca. 92009 (United States); Holland, Joe P. [10671 Jasper Ave., Redlands, Ca. 92374 (United States)

2002-07-01T23:59:59.000Z

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


481

MHD Integrated Topping Cycle Project  

SciTech Connect

This fourteenth quarterly technical progress report of the MHD Integrated Topping Cycle Project presents the accomplishments during the period November 1, 1990 to January 31, 1991. Testing of the High Pressure Cooling Subsystem electrical isolator was completed. The PEEK material successfully passed the high temperature, high pressure duration tests (50 hours). The Combustion Subsystem drawings were CADAM released. The procurement process is in progress. An equipment specification and RFP were prepared for the new Low Pressure Cooling System (LPCS) and released for quotation. Work has been conducted on confirmation tests leading to final gas-side designs and studies to assist in channel fabrication.The final cathode gas-side design and the proposed gas-side designs of the anode and sidewall are presented. Anode confirmation tests and related analyses of anode wear mechanisms used in the selection of the proposed anode design are presented. Sidewall confirmation tests, which were used to select the proposed gas-side design, were conducted. The design for the full scale CDIF system was completed. A test program was initiated to investigate the practicality of using Avco current controls for current consolidation in the power takeoff (PTO) regions and to determine the cause of past current consolidation failures. Another important activity was the installation of 1A4-style coupons in the 1A1 channel. A description of the coupons and their location with 1A1 channel is presented herein.

Not Available

1992-02-01T23:59:59.000Z

482

Comparison of Optimal Thermodynamic Models of the Tricarboxylic Acid Cycle from Heterotrophs, Cyanobacteria, and Green Sulfur Bacteria  

Science Journals Connector (OSTI)

Comparison of Optimal Thermodynamic Models of the Tricarboxylic Acid Cycle from Heterotrophs, Cyanobacteria, and Green Sulfur Bacteria ... The ability to evaluate the thermodynamics of metabolic pathways allows one to understand the relationship between coupling of energy and material gradients in the environment and the self-organization of stable biological systems, and it is shown that each cycle operates in the direction expected due to its environmental niche. ...

Dennis G. Thomas; Sebastian Jaramillo-Riveri; Douglas J. Baxter; William R. Cannon

2014-11-19T23:59:59.000Z

483

Solar cycle changes in coronal holes and space weather cycles J. G. Luhmann,1  

E-Print Network (OSTI)

Solar cycle changes in coronal holes and space weather cycles J. G. Luhmann,1 Y. Li,1 C. N. Arge,2-heliolatitude solar wind over approximately the last three solar cycles. Related key parameters like interplanetary explain solar magnetic field control of long-term interplanetary variations. In particular, the enduring

California at Berkeley, University of

484

Uncertainty Analyses of Advanced Fuel Cycles  

SciTech Connect

The Department of Energy is developing technology, experimental protocols, computational methods, systems analysis software, and many other capabilities in order to advance the nuclear power infrastructure through the Advanced Fuel Cycle Initiative (AFDI). Our project, is intended to facilitate will-informed decision making for the selection of fuel cycle options and facilities for development.

Laurence F. Miller; J. Preston; G. Sweder; T. Anderson; S. Janson; M. Humberstone; J. MConn; J. Clark

2008-12-12T23:59:59.000Z

485

PARAMETRIC CYCLE ANALYSIS FOR PULSE DETONATION ENGINES  

E-Print Network (OSTI)

PARAMETRIC CYCLE ANALYSIS FOR PULSE DETONATION ENGINES by HAIDER HEKIRI Presented to the Faculty, in particular, pulse detonation engines. Dr. Wilson taught me the basics of propulsion and made me enjoy #12;iii ABSTRACT PARAMETRIC CYCLE ANALYSIS FOR PULSE DETONATION ENGINES Publication No. ______ Haider

Texas at Arlington, University of

486

Generating Resources Combined Cycle Combustion Turbine  

E-Print Network (OSTI)

turbine (s) Heat recovery steam generator (s) - HRSG with or without duct firing Natural gas supply11/17/2014 1 Generating Resources Combined Cycle Combustion Turbine Utility Scale Solar PV Steven doing recently around two key supply-side resource technologies 1. Combined Cycle Combustion Turbine

487

mathematics Study program cycle and type  

E-Print Network (OSTI)

mathematics academic study programmm 11 #12;12 #12;· Study program cycle and type: First cycle academic study program. · AAnnttiicciippaatteedd aaccaaddeemmiicc ttiittllee:: Bachelor in Mathematics ggooaallss:: The principal goal of the academic study program in Mathematics is to qualify its graduates

Â?umer, Slobodan

488

Physics challenges for advanced fuel cycle assessment  

SciTech Connect

Advanced fuel cycles and associated optimized reactor designs will require substantial improvements in key research area to meet new and more challenging requirements. The present paper reviews challenges and issues in the field of reactor and fuel cycle physics. Typical examples are discussed with, in some cases, original results.

Giuseppe Palmiotti; Massimo Salvatores; Gerardo Aliberti

2014-06-01T23:59:59.000Z

489

Life Cycle Assessment: Past, Present, and Future  

Science Journals Connector (OSTI)

Life cycle assessment (LCA) can develop into life cycle sustainability assessment (LCSA), which is a transdisciplinary integration framework of models rather than a model in itself. ... As the environmental burden from agriculture, and especially from livestock breeding, is known to be quite important, such an analysis was interesting for policy purposes. ...

Jeroen B. Guinée; Reinout Heijungs; Gjalt Huppes; Alessandra Zamagni; Paolo Masoni; Roberto Buonamici; Tomas Ekvall; Tomas Rydberg

2010-09-02T23:59:59.000Z

490

Fish are crucial in oceanic carbon cycle  

Science Journals Connector (OSTI)

... Fish may play a more important role in the marine carbon cycle than previously thought, ... marine carbon cycle than previously thought, a new study shows. Researchers have found that fish excrete prodigious amounts of a mineral, calcium carbonate, that had been thought to come ...

Roberta Kwok

2009-01-15T23:59:59.000Z

491

An automaton model for the cell cycle  

Science Journals Connector (OSTI)

...the cell cycle phases. Upon completion of the M phase, the cell...appendix A.2). -Upon completion of the M phase, the cell...growth fraction, labeling index, duration of S phase, and...the cell cycle phases. Upon completion of the M phase, the cell...

2011-01-01T23:59:59.000Z

492

Organic photosensitive devices  

DOE Patents (OSTI)

The present invention generally relates to organic photosensitive optoelectronic devices. More specifically, it is directed to organic photosensitive optoelectronic devices having a photoactive organic region containing encapsulated nanoparticles that exhibit plasmon resonances. An enhancement of the incident optical field is achieved via surface plasmon polariton resonances. This enhancement increases the absorption of incident light, leading to a more efficient device.

Rand, Barry P; Forrest, Stephen R

2013-11-26T23:59:59.000Z

493

Binary Cycle Power Plant | Open Energy Information  

Open Energy Info (EERE)

Binary Cycle Power Plant Binary Cycle Power Plant (Redirected from Binary Cycle Power Plants) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Binary Cycle Power Plant General List of Binary Plants Binary power plant process diagram - DOE EERE 2012 Binary cycle geothermal power generation plants differ from Dry Steam and Flash Steam systems in that the water or steam from the geothermal reservoir never comes in contact with the turbine/generator units. Low to moderately heated (below 400°F) geothermal fluid and a secondary (hence, "binary") fluid with a much lower boiling point that water pass through a heat exchanger. Heat from the geothermal fluid causes the secondary fluid to flash to vapor, which then drives the turbines and subsequently, the generators.

494

Binary Cycle Power Plant | Open Energy Information  

Open Energy Info (EERE)

Binary Cycle Power Plant Binary Cycle Power Plant (Redirected from Binary) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Binary Cycle Power Plant General List of Binary Plants Binary power plant process diagram - DOE EERE 2012 Binary cycle geothermal power generation plants differ from Dry Steam and Flash Steam systems in that the water or steam from the geothermal reservoir never comes in contact with the turbine/generator units. Low to moderately heated (below 400°F) geothermal fluid and a secondary (hence, "binary") fluid with a much lower boiling point that water pass through a heat exchanger. Heat from the geothermal fluid causes the secondary fluid to flash to vapor, which then drives the turbines and subsequently, the generators. Binary cycle power plants are closed-loop systems and virtually nothing

495

NPP and the Global Carbon Cycle  

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

the Global Carbon Cycle the Global Carbon Cycle Introduction Photosynthetic carbon fixation comprises a major component of the global carbon cycle. Data on net primary productivity (NPP) may be sparse, but a consistent NPP data set may be used to calibrate, parameterize and evaluate models of terrestrial carbon cycling, as well as for validation of remote sensing data and other applications (identifying trends, investigating biogeochemical processes, etc.). It is also useful to place such data within the context of carbon cycling and carbon storage worldwide. For example: How much carbon exists in the biosphere, and where exactly is it stored? How much is in fossil fuels (coal, oil, gas), and how large are current fossil-fuel emissions? How much is in living biomass (plants/ animals/ humans)?

496

Nuclear Fuel Cycle Integrated System Analysis  

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

Fuel Cycle Integrated System Analysis Fuel Cycle Integrated System Analysis Abdellatif M. Yacout Argonne National Laboratory Nuclear Engineering Division The nuclear fuel cycle is a complex system with multiple components and activities that are combined to provide nuclear energy to a variety of end users. The end uses of nuclear energy are diverse and include electricity, process heat, water desalination, district heating, and possibly future hydrogen production for transportation and energy storage uses. Components of the nuclear fuel cycle include front end components such as uranium mining, conversion and enrichment, fuel fabrication, and the reactor component. Back end of the fuel cycle include used fuel coming out the reactor, used fuel temporary and permanent storage, and fuel reprocessing. Combined with those components there

497

VISION: Verifiable Fuel Cycle Simulation Model  

SciTech Connect

The nuclear fuel cycle consists of a set of complex components that work together in unison. In order to support the nuclear renaissance, it is necessary to understand the impacts of changes and timing of events in any part of the fuel cycle system. The Advanced Fuel Cycle Initiative’s systems analysis group is developing a dynamic simulation model, VISION, to capture the relationships, timing, and changes in and among the fuel cycle components to help develop an understanding of how the overall fuel cycle works. This paper is an overview of the philosophy and development strategy behind VISION. The paper includes some descriptions of the model components and some examples of how to use VISION.

Jacob Jacobson; A. M. Yacout; Gretchen Matthern; Steven Piet; David Shropshire; Tyler Schweitzer

2010-11-01T23:59:59.000Z

498

Pipeline bottoming cycle study. Final report  

SciTech Connect

The technical and economic feasibility of applying bottoming cycles to the prime movers that drive the compressors of natural gas pipelines was studied. These bottoming cycles convert some of the waste heat from the exhaust gas of the prime movers into shaft power and conserve gas. Three typical compressor station sites were selected, each on a different pipeline. Although the prime movers were different, they were similar enough in exhaust gas flow rate and temperature that a single bottoming cycle system could be designed, with some modifications, for all three sites. Preliminary design included selection of the bottoming cycle working fluid, optimization of the cycle, and design of the components, such as turbine, vapor generator and condensers. Installation drawings were made and hardware and installation costs were estimated. The results of the economic assessment of retrofitting bottoming cycle systems on the three selected sites indicated that profitability was strongly dependent upon the site-specific installation costs, how the energy was used and the yearly utilization of the apparatus. The study indicated that the bottoming cycles are a competitive investment alternative for certain applications for the pipeline industry. Bottoming cycles are technically feasible. It was concluded that proper design and operating practices would reduce the environmental and safety hazards to acceptable levels. The amount of gas that could be saved through the year 2000 by the adoption of bottoming cycles for two different supply projections was estimated as from 0.296 trillion ft/sup 3/ for a low supply projection to 0.734 trillion ft/sup 3/ for a high supply projection. The potential market for bottoming cycle equipment for the two supply projections varied from 170 to 500 units of varying size. Finally, a demonstration program plan was developed.

Not Available

1980-06-01T23:59:59.000Z

499

Organization | Department of Energy  

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

Organization Organization Organization Office of Indian Energy Organizational Structure As a program office at DOE responsible for implementing energy programs, the Office of Indian Energy is structurally organized under the Office of the Under Secretary. This programmatic structure also focuses and facilitates the coordination between the Office of Indian Energy and the other companion program offices such as the Office of Fossil Energy, Office of Electricity and Energy Reliability and Office of Energy Efficiency and Renewable Energy. The Office of Indian Energy is organized around its major statutory functions, namely, policy and programs: Indian Energy Policy. The Office of Indian Energy coordinates participation in the development, refinement, training, and advice

500

The helminth parasites of Siren intermedia nettingi Goin, 1942 from East Central Texas  

E-Print Network (OSTI)

testes, have penetration and cystogenous glands, develop in fingernail clams (Sphaeriidae), have a second intermediate host, and mature in fish ~ phihi (Goodchild, 19a3). 1 th life cycle f ~fh llodisto m solidum Rankin, 1937, mobile stylet.... Reconstruction of frontal sections t rough female reproductive organs, ventral view. 12. Reconstr'uction. of sagittal sections through genital pore . 31 13-14 ~gi lostom 1 m i is. 13. iihole mount, vent ~ 1 view. 14. Composit from living and fixed specimens...

Jagers, Wesley Lynn

2012-06-07T23:59:59.000Z