수치해석을 이용한 Shell and Tube형 열교환기의 결빙연구

Abstract

There is many factors that affect freezing inside the shell and tube heat exchanger (STHX), the effect of the inlet temperature and massflow rate of the heating fluid on freezing was analyzed. A computational fluid dynamics (CFD) technique was used to analyze the freezing inside the STHX, and a mixture of glycol and water in a mass ratio of 5:5 was used as a heating fluid in the analysis of this study. By varying the inlet temperature and massflow rate of the heating fluid, the amount and thickness of freezing inside the shell of STHX, the outlet temperature, the velocity field when ice was formed, and the internal temperature distribution were quantitatively analyzed. When the analysis results were analyzed, in the analysis by inlet temperature of the heating fluid, the lower the inlet temperature, the higher the amount of ice formation, and the higher the inlet temperature, the lower the amount of ice formation. However, it was confirmed that more region where than a certain amount of ice was formed in the region where the flow inside the heat exchanger was stagnant even when the inlet temperature of the heating fluid was high. In the analysis of each flow rate of the heating fluid, it was confirmed that the smaller the flow rate, the higher the amount of ice formation, and the higher the flow rate, the lower the amount of ice formation. When all the above results were put together, it was confirmed that the flow rate had a greater influence than the inlet temperature of the Heating Fluid on the growth of ice formation inside the STHX.