Performance analysis of a closed regenerated Brayton heat pump with internal irreversibilities
✍ Scribed by Lingen Chen; Ning Ni; Chih Wu; Fengrui Sun
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 144 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0363-907X
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✦ Synopsis
This paper analyses the performance of a real heat pump plant via methods of entropy generation minimization or "nite-time thermodynamics. The analytical relations between heating load and pressure ratio, and between coe$cient of performance (COP) and pressure ratio of real closed regenerated Brayton heat pump cycles coupled to constant-and variable-temperature heat reservoirs are derived. In the analysis, the irreversibilities include heat transfer-irreversible losses in the hot-and cold-side heat exchangers and the regenerator, the non-isentropic expansion and compression losses in the compressor and expander, and the pressure drop loss in the pipe and system. The optimal performance characteristics of the cycle may be obtained by optimizing the distribution of heat conductances or heat transfer surface areas among the two heat exchangers and the regenerator, and the matching between working #uid and the heat reservoirs. The in#uence of the e!ectiveness of regenerator, the e!ectiveness of hot-and cold-side heat exchangers, the e$ciencies of the expander and compressor, the pressure recovery coe$cient and the temperature of the heat reservoirs on the heating load and COP of the cycle are illustrated by numerical examples.