Thesis

R600a 적용 소형 멀티 냉동시스템의 성능특성에 관한 실험적 연구
Year of publication	2009
Title of paper	R600a 적용 소형 멀티 냉동시스템의 성능특성에 관한 실험적 연구
Author	안지훈
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Abstract	Various types of refrigerators become popular in the market such as a common refrigerator, Kimchi refrigerator and wine cellar. It is required to develop a multi function refrigerator which has different purposes in each evaporator. In this study, the performance of a multi type refrigerator system, which consists of one machine room and three evaporators, was measured in a bench type multi refrigerator. First, the multi type refrigerator system was tested by varying the number of refrigerator cabinet, refrigerant charge amount and temperature condition. Based on the experimental data, the multi type refrigerator showed better performance than the conventional refrigerator (single type). At the same external load condition, the COP of the multi type refrigerator was 1.22~1.29, but the COP of the single type refrigerator was 1.0. The single and multi type refrigerator cycles were optimized at a condensing temperature of 35.0℃ and an evaporating temperature of -25.0℃. Second, the multi type refrigerator system with the SLHX (Suction Line Heat Exchange) was tested to improve system performance. The SLHX which enhances cooling capacity of the refrigeration cycle is usually used for the household refrigerator. According to the results, the COP of the single system increased from 1.0 to 1.37, the COP of the dual and triple increase from 1.29 to 1.39, and 1.22 to 1.51 respectively. Over all systems, the SLHX system showed better performance than the non-SLHX system. In conclusion, the performance of the multi type refrigerator was investigated in two tests: base performance test (non adapting SLHX) and advanced performance test (adapting SLHX). The multi type refrigerator system showed better performance on all conditions than the single system. However, the multi type refrigerator system has a problem of fluid distribution. Especially the refrigerant is expanded at two-phase condition in a refrigerator cycle, so it makes refrigerant distribution more difficult and complex. Therefore, more studies should be performed on the refrigerant distribution of a multi type refrigerator system in the future.
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석사학위논문