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Study on the Single-Phase Heat Transfer and Pressure Drop Characteristics of R-718 in Small Diameter Tubes  

박기원 (여수대학교 냉동공학과)
권옥배 (한국가스공사 연구개발)
홍진우 (삼성전자 DA총괄 시스템가전사업)
손창효 (부경대학교 대학원 냉동공조공학과)
오후규 (부경대학교 기계공학부)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.28, no.3, 2004 , pp. 522-530 More about this Journal
Abstract
Single-phase heat transfer coefficients and pressure drops of R-718 were measured in smooth, horizontal copper tubes with inner diameters of 3.36 ㎜, 5.35 ㎜. 6.54 ㎜ and 8.12 ㎜, respectively. The experiments were conducted in the closed loop, which was driven by a magnetic gear pump. Data are presented for the following range of variables : Reynolds from 1000 to 20000. Single-phase heat transfer coefficients increased by 10∼30 % as the inner diameter of tube was reduced and it was found that a well-known previous correlation, Gnielinski's correlation was not suitable for the small diameter tubes. But the pressure drop in the small diameter tubes have been shown slightly deviations with Blauius' correlation. Based on an analogy between heat and mass transfer. the new heat transfer correlation is proposed to predict the experimental data successfully.
Keywords
Single-Phase Heat Transfer; Small Diameter Tube; R-718; Pressure Drop; Heat Pump;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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