Second-law-based thermodynamic analysis of hot-gas, by-pass, capacity-control schemes for refrigeration and air-conditioning systems

M. Yaqub, Syed M. Zubair and Shamsul Hoda Khan

Energy, 1995, vol. 20, issue 6, 483-493

Abstract: The automatic hot-gas by-pass technique is applied to reduce the capacity of refrigeration and air-conditioning systems when operating at part load. In this scheme, hot gas from the compressor is extracted and injected into the suction side of the compresor through a hot-gas by-pass valve. Thus, the refrigerant gas by-passes the evaporator and reduces the system capacity. In this paper, three hot-gas, by-pass schemes for HFC-134a are discussed ad analyzed on the basis of the first and second laws of thermodynamics. A comparative study is performed of the schemes in terms of the system coefficient of performance (COP) and irreversible component losses. Second-law-based thermodynamic analysis indicates that the total irreversible losses of the by-pass valve increase substantially as the capacity decreases.

Date: 1995
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Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:20:y:1995:i:6:p:483-493

DOI: 10.1016/0360-5442(94)00091-G

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