Engineering thermodynamics

Energy and Exergy Analysis of a Cooling/Power Cogeneration Ejector Refrigeration System

  • YANG Mengke ,
  • LI Xiuzhen ,
  • WANG Lin ,
  • YUAN Junfei ,
  • WANG Zhanwei ,
  • LIANG Kunfeng
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  • Institute of Refrigeration and Air conditioning, Henan University of Science and Technology, Luoyang 471023, China

Online published: 2023-11-30

Supported by

This study was financially supported by the National Natural Science Foundatio of China (Grant No. 51876055, 51806060, and 51706061) and the Natural Science Foundation of Henan Province (182300410233).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020

Abstract

The organic Rankine cycle is introduced into the conventional ejector refrigeration (CER) system to establish the low-grade heat-driven cooling/power cogeneration ejector refrigeration (CPC-ER) system using the isobutane as the refrigerant. In comparison with the CER system where external power is consumed by the circulating pump, the power output from the CPC-ER system is more than the power consumption of its circulating pump so that a portion of net power is derived from the CPC-ER system. Based on the mathematical model of thermodynamics, energy and exergy analysis of the CPC-ER system is carried out and compared with the CER system. The results reveal that the equivalent coefficient of performance (COP) of the CPC-ER system is 41.14% to 71.30% higher than that of the CER system, and the exergy efficiency of the CPC-ER system is 1.32 to 1.49 times higher than that of the CER system. Both the power produced by the turbine and the total exergy output from the CPC-ER system approach the maximum, as the generating temperature in the generator is up to 80°C. The CPC-ER system has the higher energy utilization efficiency than the CER system, and it is suitable for the cooling and power-required places with low-grade thermal sources.

Cite this article

YANG Mengke , LI Xiuzhen , WANG Lin , YUAN Junfei , WANG Zhanwei , LIANG Kunfeng . Energy and Exergy Analysis of a Cooling/Power Cogeneration Ejector Refrigeration System[J]. Journal of Thermal Science, 2022 , 31(2) : 448 -462 . DOI: 10.1007/s11630-020-1400-5

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