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Journal of Thermal Science 2024年第4期33卷 1491-1508页

作者： LV Jiayang WANG Chizhong CHEN Heng PAN Peiyuan XU Gang ZHANG Guoqiang School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing102206China

In order to reduce the environmental impact of conventional sludge treatment methods and to utilize the energy in sludge more effectively,a coupled system based on sewage sludge gasifier(SSG),solid oxide fuel cells(SOFC),supercritical CO_(2)cycle(S-CO_(2)),and organic rankine cycle(ORC)is *** clean syngas obtained from sludge gasification is mixed with CH4 and then first utilized by the fuel *** exhaust gas from the fuel cell is fully combusted in the afterburning chamber and then enters the bottom cycle system consisting of S-CO_(2)&ORC to generate *** understand the performance of the system,thermodynamic and economic analyses were conducted to examine the project's *** thermodynamics as well as the economics of the coupled system were analyzed to arrive at the following conclusions,the power production of the system is 37.34 MW;the exergy efficiency is 55.62%,and the net electrical efficiency is 61.48%.The main exergy destruction is the gasifier and SOFC,accounting for 62.45%of the total exergy *** takes only6.13 years to repay the construction investment in the novel system,and the project obtains a NPV of 17723820USD during 20 years *** above findings indicate that the new coupled system has a better performance in terms of energy utilization and economy.

关键词： sewage sludge gasifier SOFC supercritical CO_(2)cycle organic rankine cycle multi-system coupling

Thermodynamic Performance Analysis of Geothermal Power Plant Based on organic rankine cycle (ORC) Using Mixture of Pure Working Fluids

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Energy Engineering 2024年第8期121卷 2023-2038页

作者： Abdul Sattar Laghari Mohammad Waqas Chandio Laveet Kumar Mamdouh El Haj Assad Department of Mechanical Engineering Mehran University of Engineering and TechnologyJamshoro76062Pakistan Department of Mechanical and Industrial Engineering College of EngineeringQatar UniversityDoha00000Qatar Sustainable&Renewable Energy Engineering Department University of SharjahSharjah00000United Arab Emirates

The selection of working fluid significantly impacts the geothermal ORC’s *** a mixture as a working fluid is a strategy to improve the output of geothermal *** the current study,modelling and thermodynamic analysis of ORC,using geothermal as a heat source,is carried out at fixed operating *** model is simulated in the Engineering Equation Solver(EES).An environment-friendly mixture of fluids,i.e.,R245fa/R600a,with a suitable mole fraction,is used as the operating *** mixture provided the most convenient results compared to the pure working fluid under fixed operating *** impact of varying the evaporator pressure on the performance parameters,including energy efficiency,exergy efficiency and net power output is *** system provided the optimal performance once the evaporator pressure reached the maximum *** efficiencies:Energy and Exergy,and Net Power output of the system are 16.62%,64.08%and 2199 kW for the basic cycle and 20.72%,67.76%and 2326 kW respectively for the regenerative cycle.

关键词： organic rankine cycle internal heat exchanger moderate-temperature geothermal source mixture of the fluid exergy

A Theoretical Criterion for Evaluating the Thermodynamic Effectiveness of Regenerators in organic rankine cycle Systems

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Journal of Thermal Science 2021年第6期30卷 2027-2036页

作者： LEI Biao ZHANG Cancan ZHANG Yeqiang WU Yuting WANG Wei MA Chongfang MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation Beijing Key Laboratory of Heat Transfer and Energy ConversionFaculty of Environment and LifeBeijing University of TechnologyBeijing 100124China School of Energy and Power Engineering Zhengzhou University of Light IndustryZhengzhou 450002China

organic rankine cycle(ORC)is a promising technology for converting low or medium temperature heat into *** order to improve the thermodynamic efficiency of ORC systems,adding a regenerator to the system has been widely ***,this needs additional pipes and devices and they will produce additional pressure *** both the contributions of the regenerator and the power losses caused by additional pressure drop,a theoretical criterion for evaluating the thermodynamic effectiveness of adding a regenerator was proposed by means of mathematic and thermodynamic *** core of the criterion is a new concept named Critical Pressure Drop produced by the Regenerator(CPDR).A negative value of CPDR indicates that adding a regenerator will not contribute to the thermodynamic efficiency of ORC systems in any *** effective regenerator needs a positive value of CPDR,and requires that the value of additional pressure drop produced by introducing the regenerator should be smaller than *** influences of evaporation temperature,condensation temperature,expander efficiency,regenerator effectiveness and working fluids on CPDR were also *** was found that lower evaporation temperature or using working fluids with higher critical temperature tends to reduce the value of CPDR.

关键词： organic rankine cycle regenerator additional pressure drops

Analysis of a 1 kW organic rankine cycle using a scroll expander for engine coolant and exhaust heat recovery

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Frontiers in Energy 2017年第4期11卷 527-534页

作者： Yiji LU Anthony Paul ROSKILLY Long JIANG Longfei CHEN Xiaoli YU Sir Joseph Swan Centre for Energy Research Newcastle University Newcastle NE1 7RU UK Institute of Refrigeration and Cryogenics Shanghai Jiao TongUniversity Shanghai 200240 China School of Energy and Power Engineering Beihang University Beijing 100191 China Department of Energy Engineering Zhejiang University Hangzhou310027 China

The development of engine waste heat recov- ery technologies attracts ever increasing interests due to the rising strict policy requirements and environmental con- cerns. This paper presented the study of engine coolant and exhaust heat recovery using organic rankine cycle （ORC）. Eight working fluids were selected to evaluate and compare the performance of the integrated waste heat recovery system. Rather than the conventional engine ORC system mainly focusing on the utilization of exhaust energy, this work proposed to fully use the engine coolant energy by changing the designed parameters of the ORC system. The case study selected a small engine as the heat source to drive the ORC system using a scroll expander for power production. The evaluation results suggest that under the engine rated condition, the solution to fully recover the engine coolant energy can achieve a higher power generation performance than that of the conven- tional engine ORC system. The results suggest that adding a recuperator to the ORC system can potentially improve the system performance when the working fluids are dry and the overall dumped heat demand of the system can be reduced by 12% under optimal conditions. When the ORC evaporating and condensing temperature are respectivelyset at 85℃ and 30℃, the integrated engine waste heat recovery system can improve the overall system efficiency by 9.3% with R600, R600a or n-Pentane as the working fluid.

关键词： organic rankine cycle scroll expander cool-ant and exhaust recovery internal combustion engine

Analysis of the thermodynamic performance limits of the organic rankine cycle in low and medium temperature heat source applications

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Science China(Technological Sciences) 2021年第8期64卷 1624-1640页

作者： YANG FuBin YANG FuFang LI Jian HU ShuoZhuo YANG Zhen DUAN Yuan Yuan Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Beijing Key Laboratory for CO_(2) Utilization and Reduction TechnologyTsinghua UniversityBeijing100084China Faculty of Environment and Life Beijing University of TechnologyBeijing100124China Center for Energy Resources Engineering(CERE) Department of Chemical and Biochemical EngineeringTechnical University of Denmark2800Kgs.LyngbyDenmark

In this paper,an exploration of the practical thermodynamic performance limits of the organic rankine cycle(ORC)under working fluid and cycle parameter restrictions is *** performance limits are more realistic benchmarks for the thermodynamic cycle than the efficiency of the Carnot *** ORC configuration with four typical case studies that are related to temperature ranging from 373.15 to 673.15 K is taken into *** ORC is defined by its cycle parameters and working fluid characteristic *** cycle parameters involve evaporation temperature(T_(eva)),condensation temperature(T_(con))and superheat degree(ΔT_(sup)),while the working fluids are represented by the characteristic properties including critical temperature(T_(c)),critical pressure(p_(c)),acentric factor(ω),and molar ideal gas isobaric heat capacity based on the principle of corresponding ***,Pareto optimum solutions for obtained hypothetical working fluids and cycle parameters are achieved using multi-objective optimization method with the consideration of both thermal efficiency(η_(th))and volumetric power output(VPO).Finally,sensitivity analysis of the working fluid characteristic properties is conducted,and the second law of thermodynamics analysis,especially the applicability of entropy generation minimization,is *** results show that the current commonly used working fluids are widely scattered below the Pareto front that represents the tradeoff betweenη_(th) and VPO for obtained hypothetical fluids.T_(eva) and T_(con) are the most dominant cycle parameters,while T_(c) and ωtend to be the most dominant characteristic property *** entropy generation minimization does not give the same optimal results.

关键词： organic rankine cycle thermodynamic performance limit working fluids cycle parameters

A Method for Determining the Operable Ideal Condensation Temperature of Dry and Isentropic Fluids Used in organic rankine cycle(ORC)Based on Temperature-Entropy(T-s)Diagram

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Journal of Thermal Science 2023年第6期32卷 2144-2154页

作者： ZHANG Xinxin LI Yang MOE key laboratory of enhanced heat transfer and energy conservation Beijing University of TechnologyBeijing100124China Beijing key laboratory of heat transfer and energy conversion Beijing University of TechnologyBeijing100124China

Condensation temperature is one of the crucial parameters determining the performance of an organic rankine *** is necessary to consider the differences in the working fluids themselves when setting the condensation temperature of organic rankine *** current study,temperature-entropy(T-s)diagram is employed to describe the difference in working *** areas of dry and isentropic fluids in a temperature-entropy(T-s)diagram,which are the area denoting net output work of cycle(A_(1),the area denoting net output work of the Carnot cycle(A),and the curved triangle in superheated region denoting condensation characteristics(A_(2)),are *** this basis,the ratio of A_(2)to A_(1)and the ratio of A_(1)to A are *** Mean Difference of the above two ratios is obtained to determine the operable ideal condensation temperature of 66 dry and isentropic fluids employed in organic rankine *** findings indicate that the operable ideal condensation temperatures for the majority of dry and isentropic fluids are in the range of 305 K to 310 *** work presented in this study may be useful for designing and establishing an organic rankine cycle system.

关键词： organic rankine cycle T-s(temperature-entropy)diagram condensation temperature dry f isentropic fluids logarithmic mean difference

A thermodynamics comparison of subcritical and transcritical organic rankine cycle system for power generation

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Journal of Central South University 2015年第9期22卷 3641-3649页

作者：朱家玲薄华宇李太禄胡开永刘克涛 Key Laboratory of Efficient Utilization of Low and Medium Grade Energy of Ministry of Education (Tianjin University) Tianjin Geothermal Research and Training Center School of Mechanical Engineering Tianjin University Department of Thermal Engineering School of Energy and Safety Engineering Tianjin Chengjian University

A comparison on subcritical and transcritical organic rankine cycle（ORC） system with a heat source of 110 ℃ geothermal water was presented. The net power output, thermal and exergy efficiencies and the products of the heat transfer coefficient（U） and the total heat exchange area（A）（UA values） were calculated for parametric optimization. Nine candidate working fluids were investigated and compared. Under the given conditions, transcritical systems have higher net power outputs than subcritical ones. The highest net power output of transcritical systems is 18.63 k W obtained by R218, and that of subcritical systems is 13.57 k W obtained by R600 a. Moreover, with the increase of evaporating pressure, the thermal and exergy efficiencies of transcritical systems increase at first and then decrease, but the efficiencies of subcritical ones increase. As a result, the efficiencies of transcritical systems cannot always outperform those of the subcritical ones. However, the subcritical systems have lower minimum UA values and lower expansion ratios than the transcritical ones at the maximum net power output. In addition, the transcritical cycles have higher expansion ratios than the subcritical ones at their maximum net power output.

关键词： organic rankine cycle low temperature heat source parametric optimization

An approach for IC engine coolant energy recovery based on low-temperature organic rankine cycle

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Journal of Central South University 2015年第2期22卷 727-734页

作者：付建勤刘敬平徐政欣邓帮林刘琦 Research Center for Advanced Powertrain Technology Hunan University

To promote the fuel utilization efficiency of IC engine, an approach was proposed for IC engine coolant energy recovery based on low-temperature organic rankine cycle(ORC). The ORC system uses IC engine coolant as heat source, and it is coupled to the IC engine cooling system. After various kinds of organic working media were compared, R124 was selected as the ORC working medium. According to IC engine operating conditions and coolant energy characteristics, the major parameters of ORC system were preliminary designed. Then, the effects of various parameters on cycle performance and recovery potential of coolant energy were analyzed via cycle process calculation. The results indicate that cycle efficiency is mainly influenced by the working pressure of ORC, while the maximum working pressure is limited by IC engine coolant temperature. At the same working pressure, cycle efficiency is hardly affected by both the mass flow rate and temperature of working medium. When the bottom cycle working pressure arrives at the maximum allowable value of 1.6 MPa, the fuel utilization efficiency of IC engine could be improved by 12.1%.All these demonstrate that this low-temperature ORC is a useful energy-saving technology for IC engine.

关键词： IC engine waste heat recovery organic rankine cycle cycle efficiency coolant energy

Performance Evaluation and Optimization of a Novel System Combining a Photovoltaic/Thermal Subsystem&an organic rankine cycle Driven by Solar Parabolic Trough Collector

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Journal of Thermal Science 2021年第5期30卷 1513-1525页

作者： LIU Zhijian WEI Tianhe WU Di ZHANG Yulong LI Guiqiang YANG Xinyan Department of Power Engineering North China Electric Power UniversityBaoding 071003China Research Centre for Sustainable Energy Technologies University of HullHull HU67RXUK Institute of Building Environment and Energy China Academy of Building ResearchBeijing 100013China

A novel coupling system that combines a photovoltaic/thermal(PV/T)subsystem and an organic rankine cycle(ORC)driven by solar parabolic trough collector(PTC)is presented in this *** mathematical model is initially *** the basis,the influence of area ratio of two collectors(PV/T and PTC)on the performance of system is *** results show that the optimal area ratio of PV/T to PTC is 8:2,which can achieve the maximum energy ***,the performance of the coupling system and two independent systems(PV/T and ORC system)are compared and *** results show that the coupling system is more reliable and its total output energy(heat and electricity)is the highest,compared with the other two independent *** solar energy utilization efficiency of the coupling system is 40%higher than that of the other two independent systems in the steady-state ***,the annual output energy per unit area collector of the coupling system is 13%higher than that of the other two independent systems in the dynamic ***,in the dynamic simulation of a typical day,the PV panels’temperature of the coupling system is 5℃–7℃ lower than that of the independent PV/T *** means that the power generation efficiency of PV panels can be increased by 1.5%–3.5%.This study aims to explore the operation characteristics of the novel solar energy utilization coupling system and promote the development of renewable energy utilization models,which provides a reference for the design and optimization of related energy systems.

关键词： solar energy utilization efficiency photovoltaic/thermal organic rankine cycle novel coupling system area ratio

Performance Assessment of a Novel Polygeneration System Based on the Integration of Waste Plasma Gasification,Tire Pyrolysis,Gas Turbine,Supercritical CO_(2)cycle and organic rankine cycle

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Journal of Thermal Science 2023年第6期32卷 2196-2214页

作者： FENG Fuyuan LI Tongyu AN Jizhen CHEN Heng WANG Yi’nan XU Gang ZHAO Qinxin LIU Tong Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation North China Electric Power UniversityBeijing102206China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management Institute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou510650China Key Laboratory of Thermo-Fluid Science and Engineering of MOE Xi’an Jiaotong UniversityXi’an710049China

In this paper,a novel polygeneration system involving plasma gasifier,pyrolysis reactor,gas turbine(GT),supercritical CO_(2)(S-CO_(2))cycle,and organic rankine cycle(ORC)has been *** the proposed scheme,the syngas is obtained by the gasification and the pyrolysis is first burned and drives the gas turbine for power generation,and then the resulting hot exhaust gas is applied to heat the working fluid for the supercritical CO_(2)cycle and the working fluid for the bottom organic rankine *** addition to the electrical output,the pyrolysis subsystem also produces pyrolysis oil and ***,energy recovery is achieved while treating waste in a non-hazardous *** performance of the new scheme was examined by numerous methods,containing energy analysis,exergy analysis,and economic *** is found that the net total energy output of the polygeneration system could attain 19.89 MW with a net total energy efficiency of 52.77%,and the total exergy efficiency of 50.14%.Besides,the dynamic payback period for the restoration of the proposed project is only 3.31 years,and the relative net present value of 77552640 USD can be achieved during its 20-year lifetime.

关键词： polygeneration system waste plasma gasification tire pyrolysis gas turbine cycle supercritical CO_(2)cycle organic rankine cycle