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경부하 성능향상을 위한 가스바이패스형 오일쿨러에 관한 연구
염한길(Hankil Yeom),이승우(Seung Woo Lee),하승한(Seung Han Ha) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Oil cooler is a temperature controller using oil. The gas by-pass type can provide both acceptable performance and economy with excellent accuracy of temperature control and an economic price. But this type has a problem in low load state. Because traditional gas by-pass type oil cooler has capillary tube expansion device which is restricted the by-passed hot gas. In this study, we recommend the modified control method that can be applied to the gas by-pass type oil cooler. The capillary tube is replaced by an electronic expansion device. There are two dynamic expansion devices in modified oil cooler. One controls liquid refrigerant at condenser outlet and another controls by-passed hot gas at compressor outlet. This cooler can be adapted to low load state by linked controlling of two electronic expansion devices. In test results, modified oil cooler was more effective than traditional cooler.