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LNG 저장탱크 재액화용 LNG Sub-Cooler 및 N₂ Pre-Cooler 열전달 특성 및 구조안정성 해석
김경환(Kyeong-Hwan Kim),이연원(Yeon-Won Lee),천남주(Nam-Joo Chun),하성용(Seong-Yong Ha),제승봉(Seung-Bong Jae),최윤환(Yoon-Hwan Choi) 한국동력기계공학회 2020 동력시스템공학회지 Vol.24 No.6
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.