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수평관내 이산화탄소의 냉각열전달과 압력강하 특성에 관한 연구
손창효(Son C. H.),김종열(Kim J. R.),노건상(Roh G. S.),구학근(Ku H. G.),박기원(Park G. W.),오후규(Oh H. K.) 한국마린엔지니어링학회 2005 한국마린엔지니어링학회 학술대회 논문집 Vol.2005 No.-
This paper presents the heat transfer and pressure drop characteristics during cooling process of carbon dioxide in a horizontal tube. The test section is a tube in tube type heat exchanger with refrigerant flowing in the inner tube and water flowing in the annulus. It was made of a stainless steel tube with the inner diameter of 7.75[㎜], the outer diameter of 9.53[㎜] and length of 6000[㎜]. The refrigerant mass fluxes were 200~400[㎏/㎡s] and the average pressure varied from 7.5[㎫] to 10.0[㎫]. The main results were summarized as follows : The heat transfer coefficient of supercritical CO₂ increases in decrease of the gas cooler pressure. And the heat transfer coefficient increases with respect to the increase of the refrigerant mass flux. Among some correlations proposed in a transcritical region, Bringer-Smith's correlation has some analogy with experimental results. The pressure drop decreases in increase of the gas cooler pressure and increases with respect to increase the refrigerant mass flux.