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Theoretical Performance Analysis of an Ejector Enhanced high-temperature heat pump with Dual-Pressure Condensation and Evaporation

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Journal of Thermal Science 2022年第5期31卷 1367-1379页

作者： BAI Tao LIU Ye YAN Gang YU Jianlin Department of Refrigeration and Cryogenic Engineering School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an710049China

In this paper,an ejector enhanced high-temperature heat pump with dual-pressure condensation and evaporation is proposed to improve the system *** analyses of the system operation characteristics are conducted using energetic and exergetic *** performance comparisons among the basic cycle,parallel compression cycle,and ejector enhanced cycle are conducted with six different refrigerants,including R245fa,R600a,R1234ze(Z),R1336mzz(Z),R1224yd(Z),and R1233zd(E).The results demonstrate that environmentally-friendly refrigerant R1234ze(Z)would be a promising alternative *** with the basic cycle and parallel compression cycle at selected operation conditions,29.5%and 12.6%improvements in COP,and 16.7%and 11.1%higher system exergy efficiency are achieved in the ejector enhanced cycle on *** volumetric heating capacity of the ejector enhanced cycle is increased by 15.7%–21.7%.The ejector enhanced cycle outperforms the other two cycles in high-temperature heat pump applications at the large temperature lift and temperature rise in the heat *** assessment offers an option to improve the energy utilization efficiency of the high-temperature heat pumps.

关键词： thermodynamics exergy high-temperature heat pump ejector dual-temperature condensation/evaporation

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Intelligent prediction on performance of high-temperature heat pump systems using different refrigerants

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Journal of Central South University 2018年第11期25卷 2754-2765页

作者： YU Xiao-hui ZHANG Yu-feng ZHANG Yan HE Zhong-lu DONG Sheng-ming MA Xue-lian YAO Sheng School of Environmental Science and Engineering Tianjin University School of Architecture Tianjin University

Two new binary near-azeotropic mixtures named M1 and M2 were developed as the refrigerants of the high-temperature heat pump(HTHP).The experimental research was used to analyze and compare the performance of M1 and M2-based in the HTHP in different running *** results demonstrated the feasibility and reliability of M1 and M2 as new high-temperature ***,the exploration and analyses of the support vector machine(SVM)and back propagation(BP)neural network models were made to find a practical way to predict the performance of HTHP *** results showed that SVM-Linear,SVM-RBF and BP models shared the similar ability to predict the heat capacity and power input with high ***-RBF demonstrated better stability for coefficient of performance ***,the proposed SVM model was used to assess the potential of the M1 and *** results indicated that the HTHP system using M1 could produce heat at the temperature of 130°C with good performance.

关键词： high-temperature heat pump experimental performance support vector machine back propagation neural network performance prediction

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Thermo-Economic Performance of Geothermal Driven high-temperature Flash Tank Vapor Injection heat pump System:A Comparison Study

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Energy Engineering 2023年第8期120卷 1817-1835页

作者： Huashan Li Xiaoshuang Zhao Sihao Huang Lingbao Wang Jiongcong Chen Guangzhou Institute of Energy Conversion Chinese Academy of SciencesGuangzhou510640China University of Chinese Academy of Sciences Beijing100049China

Process heating constitutes a significant share of final energy consumption in the industrial sector around the *** this paper,a high-temperature heat pump(HTHP)using flash tank vapor injection technology(FTVI)is proposed to develop low-temperature geothermal source for industrial process heating with temperature above 100°*** heat sink output temperatures between 120°C and 150°C,the thermo-economic performance of the FTVI HTHP system using R1234ze(Z)as refrigerant is analyzed and also compared to the single-stage vapor compression(SSVC)system by employing the developed mathematical *** coefficient of performance(COP),exergy efficiency(ηexe),net present value(NPV)and payback period(PBP)are used as performance *** results show that under the typical working conditions,the COP andηexe of FTVI HTHP system are 3.00 and 59.66%,respectively,and the corresponding NPV and PBP reach 8.13×106 CNY and 4.13 years,*** the high-temperature heating conditions,the thermo-economic performance of the FTVI HTHP system is significantly better than that of the SSVC system,and the larger the temperature lift,the greater the thermo-economic advantage of the FTVI HTHP ***,the FTVI HTHP system is more capable than the SSVC system in absorbing the financial risks associated with changes of electricity price and natural gas price.

关键词： Geothermal water high-temperature heat pump flash tank vapor injection thermo-economic performance

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Proposal and Assessment of an Engine-Based Distributed Steam and Power Cogeneration System Integrated with an Absorption-Compression heat pump

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Journal of Thermal Science 2020年第5期29卷 1165-1179页

作者： LIU Changchun HAN Wei WANG Zefeng ZHANG Na Institute of Engineering Thermophysics Chinses Academy of SciencesBeijing 100190China Beijing Key Laboratory of Distributed Combined Cooling heating and Power System Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Internal combustion engine-based poly-generation systems have been widely used for energy savings and emissions *** maximize their thermodynamic and environmental performance potentials,the efficient recovery of flue gas and jacket water heat is *** a conventional internal combustion engine-based steam and power cogeneration system,the low-temperature(less than 170°C)heat from flue gas and jacket water is usually directly discharged to the environment,which dramatically reduces the thermal and economic *** this work,a high-temperature heat pump is employed to recover this part of low-temperature heat for steam *** sensible heat of the flue gas and jacket water is cascade utilized in a steam generator and a heat *** results show that the process steam yield of the proposed system is almost doubled(increased by 703 kg/h)compared to that of an engine-based cogeneration system without a heat *** proposed system can reduce natural gas consumption,C 02 and NOx emissions by approximately 199069 m3,372.64 tons and 3.02 tons per year,respectively,with a primary energy ratio and exergy efficiency of 72.52%and 46.28%,***,the proposed system has a lower payback period with a value of 5.11 years,and the determining factors that affect the payback period are natural gas and electricity *** total net present value of the proposed system within its lifespan is 2441581 USD,and an extra profit of 785748 USD can be obtained compared to the reference *** is a promising approach for replacing gas boilers for process steam production in industrial sectors.

关键词： steam and power cogeneration HACHP ICE high-temperature heat pump

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