LNG 운반선 PCHE 열교환기 내 상변화에 대한 수치해석

Abstract

In this study, we studied the ice accretion that occurs in the next-generation heat exchanger, the PCHE(Printed Circuit Heat Exchanger) channel. PCHE heat exchanger is called the next-generation heat exchanger, and it has the advantage of being able to reduce the heat exchange efficiency by less than 1/10 compared to the existing heat transfer tube type method along with high heat exchange efficiency of more than 90%. Three CFD(Computational Fluid Dynamics) analysis were conducted prior to modeling and analysing PCHE heat exchanger through Ansys Fluent and Fensap-Ice. Through the established interpretation methodology, simulated heat exchange and phase changes caused by temperature differences between fluids through Hot Water and LNG(Liquified Natural Gas) flowing into the PCHE channel. First, setting the temperature of Hot Water to 10℃ to 80℃, and identified the heat exchange according to each temperature through CFD simulation. Next setting the temperature of Hot Water to 10℃, 50℃ and 90℃ and identified the ice accretion in the channel according to each temperature through CFD simulation.