Abstract
In this study, the heat transfer characteristics - in accordance with the operating conditions - of the heat exchanger for re-liquefaction of LNG storage tanks is analyzed. The heat transfer characteristics and structural stability were analyzed for each of the sub-cooler and pre-cooler, which uses an LNG fluid and an N2 fluid respectively. The N2 fluid is used in the actual experiment. Considering the efficiency and cost of the calculation, 1/25 and 1/49 reduced models were used for the number of pipes; the temperature difference among pipes at the outlet was less than 5%. Hence it was confirmed that the analysis of the reduced model was reasonable. Comparing with the one-dimensional analysis results, a discrepancy from 2.2% to 7.4% could be confirmed. By visualizing the flow field through the computational fluid cynamics (CFD) analysis, the cause of inefficiency could be identified. The analysis results will be helpful in understanding the exact performance of the heat exchanger by predicting the design variables in the future.
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