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EXPERIMENTAL INVESTIGATION OF DEFROST USING WARM LIQUID REFRIGERANT
Citation:
Gage*, C L. AND G. S. Kazachki. EXPERIMENTAL INVESTIGATION OF DEFROST USING WARM LIQUID REFRIGERANT. Presented at International Refrigeration Congress, Washington DC, 17-22 August 2003.
Description:
This paper reports the results from laboratory tests of a low-temperature supermarket refrigeration system with two open and two reach-in display cases. Tests were performed at condensing temperatures ranging from 10 to 40 C and at an evaporating temperature of -34 C. The performance of the system with warm-liquid defrost was compared against the system with electric defrost at the same test conditions. The results confirmed the ability of the warm liquid refrigerant to complete defrost at condensing temperatures above 15-20 C. At lower condensing temperatures, the refrigerant tends to migrate from the receiver into the suction accumulator. For comparable defrost times, the product temperature rise during warm-liquid defrost was less than for electric defrost, indicating a potential for improved product integrity. No energy benefits were observed for the defrost time of one hour.