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TECHNICAL PAPERS

Capacity Control for Refrigeration and Air-Conditioning Systems: A Comparative Study

[+] Author and Article Information
Mohammad Yaqub, Syed M. Zubair

Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia

J. Energy Resour. Technol 123(1), 92-99 (Sep 27, 2000) (8 pages) doi:10.1115/1.1349117 History: Received March 20, 2000; Revised September 27, 2000
Copyright © 2001 by ASME
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References

Figures

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System components for hot-gas by-pass, cylinder-unloading and suction-gas throttling capacity control schemes
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A flow chart for thermodynamic analysis of a hot-gas by-pass scheme
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Performance curves for an actual system and thermodynamic model 14
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Percentage of full load system capacity versus percentage of by-pass mass fraction of refrigerant for the hot-gas by-pass scheme
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COP versus percentage of by pass mass fraction of refrigerant for the hot-gas by-pass scheme
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System temperatures versus percentage of by-pass mass fraction of refrigerant for the hot-gas by-pass scheme
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The mass ratio and percentage of full-load system-capacity versus fraction of cylinders in operation for the cylinder-unloading scheme
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COP versus fraction of cylinders in operation for the cylinder-unloading scheme
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System temperatures versus fraction of cylinders in operation for the cylinder-unloading scheme
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The mass ratio and percentage of full-load system capacity versus throttling ratio for the suction-throttling scheme
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COP versus throttling ratio for the suction-gas throttling scheme
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System temperatures versus the throttling ratio for the suction-throttling scheme
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COP versus percentage of full load system capacity: a comparison of all the schemes
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Evaporator temperature versus percentage of full load system capacity: a comparison of all the schemes
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Condenser temperature versus percentage of full load system capacity: a comparison of all the schemes
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Highest temperature of the cycle versus percentage of full load system capacity: a comparison of all the schemes

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