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

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

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.

Suggested Citation

  • Yaqub, M. & Zubair, Syed M. & Khan, Shamsul Hoda, 1995. "Second-law-based thermodynamic analysis of hot-gas, by-pass, capacity-control schemes for refrigeration and air-conditioning systems," Energy, Elsevier, vol. 20(6), pages 483-493.
    • Handle: RePEc:eee:energy:v:20:y:1995:i:6:p:483-493
    DOI: 10.1016/0360-5442(94)00091-G
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    Cited by:

    1. Yang, Jun Lan & Ma, Yi Tai & Li, Min Xia & Guan, Hai Qing, 2005. "Exergy analysis of transcritical carbon dioxide refrigeration cycle with an expander," Energy, Elsevier, vol. 30(7), pages 1162-1175.
    2. Yaqub, M & M. Zubair, Syed & Khan, Jameel-ur-Rehman, 2000. "Performance evaluation of hot-gas by-pass capacity control schemes for refrigeration and air-conditioning systems," Energy, Elsevier, vol. 25(6), pages 543-561.
    3. Mohammad, Abdulrahman Th. & Bin Mat, Sohif & Sulaiman, M.Y. & Sopian, K. & Al-abidi, Abduljalil A., 2013. "Survey of hybrid liquid desiccant air conditioning systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 20(C), pages 186-200.

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