Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 41, Issue 11, Pages 1201-1222Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0196-8904(99)00169-7
Keywords
integrated mechanical-subcooling system; finite-time thermodynamic model; characteristic performance curves
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Subcooling of the refrigerant at the exit of the condenser in a simple vapor-compression refrigeration system allows the refrigerant to enter the main cycle evaporator with low quality. Thus, allowing the refrigerant to absorb more heat in the evaporator; thereby improving the coefficient of performance (COP) of the system. In an integrated mechanical-subcooling vapor-compression refrigeration system, the subcooling is performed by utilizing a small integrated vapor-compression refrigeration cycle, known as the subcooler cycle. This subcooler cycle is coupled to the main cycle at the exit of the condenser and it utilizes the main cycle condenser for rejecting the heat. In this paper, thermodynamic models of an integrated mechanical subcooling system are developed to simulate the actual performance of the subcooling system, particularly with respect to the subcooler saturation temperature in addition to heat exchanger areas. It is demonstrated that the performance of the overall cycle is improved over the corresponding simple cycle. This improvement is found to be related to the refrigerant saturation. temperature of the subcooler. The model is also used for predicting an optimum distribution of the total heat exchanger area between the evaporator and condenser. (C) 2000 Elsevier Science Ltd. All rights reserved.
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