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Thermodynamic analysis of capacity-control schemes for refrigeration and air-conditioning systems

Author

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  • Yaqub, M.
  • Zubair, Syed M.

Abstract

Cylinder unloading and suction-gas throttling schemes are studied to reduce the capacity of refrigeration and air-conditioning systems when operating at reduced load. In the first scheme, an unloaded valve is used to unload one or more cylinders at part-load conditions. The unloading of cylinders reduces the mass-flow rate of refrigerant in the system and thus reduces the system capacity, whereas in suction-gas throttling, a throttling valve is needed before the compressor to reduce the mass-flow rate through the compressor. These schemes are discussed for HFC-134a and compared on the basis of the first and second laws of thermodynamics. A hot-gas by-pass capacity-control scheme is also examined in terms of system coefficient of performance (COP) and irreversible component losses. It is found that the cylinder-unloading scheme is best and has the highest COP and minimum irreversible losses at any system capacity.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:21:y:1996:i:6:p:463-472
    DOI: 10.1016/0360-5442(95)00111-5
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    Cited by:

    1. 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.
    2. Kui Lu & Ibrahim A. Sultan & Truong H. Phung, 2023. "A Literature Review of the Positive Displacement Compressor: Current Challenges and Future Opportunities," Energies, MDPI, vol. 16(20), pages 1-25, October.

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