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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

Buehler,  L., 1968, “Capacity Control,” ASHRAE J., 10, No. 11, pp. 39–44.
Zubair,  S. M., and Bahel,  V., 1989, “Compressor Capacity Modulation Scheme,” Heat./Piping/Air Cond., 61, No. 1, pp. 135–143.
Kirkman,  C. G., 1968, “Automatic Hot-Gas By-Pass,” Air Cond. Heat. Ventil., 65, No. 1, pp. 64–68.
Gosney, W. B., 1982, Principles of Refrigeration, Cambridge University Press, Cambridge, U.K.
Hiller, C. C., and Gilicksman, L. R., 1976, “Improving Heat Pump Performance Via Compressor Capacity Control—Analysis and Test,” Technical Report No. MIT-EL-76-001, Massachusetts Institute of Technology, Cambridge, MA.
Yaqub,  M., and Zubair,  S. M., 1996, “Thermodynamic Analysis of Capacity-Control Schemes for Refrigeration and Air-Conditioning Systems,” Energy (Oxford), 21, No. 6, pp. 463–472.
Yaqub,  M., Zubair,  S. M., and Khan,  S. H., 1995, “Second-Law-Based Thermodynamic Analysis of Hot-Gas By-Pass, Capacity-Control Schemes for Refrigeration and Air-Conditioning Systems,” Energy (Oxford), 20, No. 6, pp. 483–493.
Klein,  S. A., 1992, “Design Consideration for Refrigeration Cycles,” Int. J. Refrig., 15, No. 3, pp. 181–185.
Gordon,  J. M., Chua,  H. T., and Ng,  K. C., 1996, “Experimental Study of the Fundamentals Properties of the Reciprocating Chillers and their Relation to the Thermodynamic Modelling and Chiller Design,” Int. J. Heat Mass Transf., 39, No. 11, pp. 2195–2204.
Khan,  S. H., and Zubair,  S. M., 1993, “Thermodynamic Analysis of the CFC-12 and HFC-134a Refrigeration Cycles,” Energy (Oxford), 18, No. 7, pp. 717–726.
Kartsounes,  G. T., and Erth,  R. A., 1971, “Computer Calculations of the Thermodynamic Properties of Refrigerants 12, 22, and 502,” ASHRAE Trans., 77, No. 2, pp. 88–103.
Fisher, S. K., and Rice, C. K., 1983, “The Oak Ridge Heat Pump Model: 1. A Steady-State Computer Design Model for Air-to-Air Heat Pumps,” Technical Report No. ORNL/CON-80/R1, Oak Ridge National Laboratory, Oak Ridge, TN.
Stoecker, W. F., and Jones, J. W., 1982, Refrigeration and Air Conditioning. McGraw Hill Book Company, New York, NY.
Khan,  J. R., and Zubair,  S. M., 1999, “Design and Performance Evaluation of Reciprocating Refrigeration Systems,” Int. J. Refrig., 22, No. 3, pp. 235–243.

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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