Abstract
Abstract: Natural gas is converted in to LNG by chilling and liquefying the gas to the temperature of -162℃, when liquefied, the volume of natural gas is reduced to 1/600 of its standard volume. This gives LNG the advantage in transportation. In this study, the effects of the pressure drop of refrigerant and natural gas in the LNG heat exchanger of cryogenic cascade refrigeration cycle were investigated and then the design criteria for the pressure drop of refrigerant and natural gas of the LNG heat exchanger were proposed. The pressure drop of the cascade liquefaction cycle was investigated and simulated using HYSYSsoftware. The simulation results showed that the pressure drop in the LNG heat exchanger is set to 50 kPaconsidering the increase in the compressor work and COP of cryogenic cascade liquefaction cycle. Key words: Liquefaction process of natural gas, Compressor work, Cascade refrigeration cycle, Pressure drop, LNG heat exchanger, COP †교신저자(부경대학교 냉동공조공학과, E-mail: sonch@pknu.ac.kr, Tel: 051-621-6802)1 부경대학교 냉동공조공학과, E-mail: yoonji@pknu.ac.kr, Tel: 051-629-61802 부경대학교 냉동공조공학과, E-mail: choikh@pknu.ac.kr, Tel: 051-629-61793 (주)LG전자 HA 냉장고사업부 연구기획, E-mail: boisvent@naver.com, Tel: 010-4590-64324 부경대학교 대학원, E-mail: hottock77@pknu.ac.kr, Tel: 051-629-6180
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