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Performance evaluation of hot-gas by-pass capacity control schemes for refrigeration and air-conditioning systems

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  • Yaqub, M
  • M. Zubair, Syed
  • Khan, Jameel-ur-Rehman

Abstract

The capacity control of a vapor-compression refrigeration system is investigated by injecting hot gas and liquid refrigerant into the suction side of the compressor. Three different possibilities for the by-pass schemes are investigated for HFC-134a by considering finite size of the components that are used in the refrigeration systems. The model considers the finite-temperature difference in the heat exchangers, thus allowing the variations in the condenser and evaporator temperatures with respect to capacity and external-fluid inlet temperatures. It is demonstrated that the compressor discharge temperatures increase significantly when the hot-gas from the compressor discharge is extracted and injected (without any liquid injection) directly into the suction side of the compressor. A comparative study is also performed of these schemes in terms of the system coefficient of performance (COP), operating temperatures and the refrigerant by-pass fraction as a function of the percentage capacity reduction.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:25:y:2000:i:6:p:543-561
    DOI: 10.1016/S0360-5442(00)00004-9
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    References listed on IDEAS

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    1. 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.
    2. Yaqub, M. & Zubair, Syed M., 1996. "Thermodynamic analysis of capacity-control schemes for refrigeration and air-conditioning systems," Energy, Elsevier, vol. 21(6), pages 463-472.
    3. Khan, Shamsul Hoda & Zubair, Syed M., 1993. "Thermodynamic analyses of the CFC-12 and HFC-134a refrigeration cycles," Energy, Elsevier, vol. 18(7), pages 717-726.
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    Cited by:

    1. Amer, Mohammed & Wang, Chi-Chuan, 2017. "Review of defrosting methods," Renewable and Sustainable Energy Reviews, Elsevier, vol. 73(C), pages 53-74.
    2. Liang, Jierong & Sun, Li & Li, Tingxun, 2018. "A novel defrosting method in gasoline vapor recovery application," Energy, Elsevier, vol. 163(C), pages 751-765.
    3. Cho, Honghyun & Kim, Yongchan & Jang, Inkyu, 2005. "Performance of a showcase refrigeration system with multi-evaporator during on–off cycling and hot-gas bypass defrost," Energy, Elsevier, vol. 30(10), pages 1915-1930.

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