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Experimental Investigation of the Effect of Using Porous Internal Sub-cooler on the Performance of Refrigeration System: R422A Case Study

Received: 8 February 2019 Accepted: 9 December 2019 The effect of using porous sub-cooler on the performance of a refrigeration system using the refrigerant R422A as case study was experimentally investigated. The variations of refrigeration capacity, coefficient of performance, relative capacity index, power consumption per ton of refrigeration and pressure drop with degree of sub-cooling and internal sub-cooler porosity were studied. Results showed that the refrigeration capacity, coefficient of performance and relative capacity index can be improved by increasing degree of subcooling and decreasing the porosity of the internal sub-cooler with average percentages of increase of 38.5%, 48% and 58%, respectively. The refrigerant R422A exhibited low power consumption per ton of refrigeration when using porous internal sub-cooler. Effects of internal sub-cooler effectiveness and pressure drop on the performance of the refrigeration system were also studied. An average percent decrease of about 9.5%, of power consumption per ton of refrigeration was recorded by decreasing porosity from 43% to 40%.