A cycle model of a multi-stage combined heat pump system, which includes the irreversibility of finite rate heat transfer across finite temperature differences and the irreversibilities inside the working fluid, is established and used to investigate the influence of these irreversibilities on the performance of the system. The profit of operating the heat pump system is taken as an objective function for optimization. The maximum profit is calculated for a given total heat transfer area or total thermal conductance of heat exchangers. The coefficient of performance, heating load, and power input at the maximum profit are determined. The distribution of the heat transfer areas or the thermal conductances of heat exchangers and the temperature ratios of the working fluids of two adjacent cycles in heat exchange processes are optimized. The results obtained here are generally significant. They are suitable for an arbitrary-stage irreversible and endo- reversible combined heat pump system. [S0195-0738(00)01104-3]
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December 2000
Technical Papers
Thermoeconomic Analysis on the Performance Characteristics of a Multi-Stage Irreversible Combined Heat Pump System
Jincan Chen,
Jincan Chen
Department of Physics, Xiamen University, Xiamen 361005, People’s Republic of China
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Chih Wu
Chih Wu
Department of Mechanical Engineering, U. S. Naval Academy, Annapolis, MD 21402-5042
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Jincan Chen
Department of Physics, Xiamen University, Xiamen 361005, People’s Republic of China
Chih Wu
Department of Mechanical Engineering, U. S. Naval Academy, Annapolis, MD 21402-5042
Contributed by the Advanced Energy Systems Division for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received by the AES Division, January 10, 2000; revised manuscript received September 7, 2000. Associate Technical Editor: F. Chen.
J. Energy Resour. Technol. Dec 2000, 122(4): 212-216 (5 pages)
Published Online: September 7, 2000
Article history
Received:
January 10, 2000
Revised:
September 7, 2000
Citation
Chen, J., and Wu, C. (September 7, 2000). "Thermoeconomic Analysis on the Performance Characteristics of a Multi-Stage Irreversible Combined Heat Pump System ." ASME. J. Energy Resour. Technol. December 2000; 122(4): 212–216. https://doi.org/10.1115/1.1326914
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