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http://dx.doi.org/10.5916/jkosme.2007.31.6.707

Heat Transfer Characteristics of Inclined Helical Coil Type Heat Exchanger  

Son, Chang-Hyo (부경대학교 기계공학부)
Jeon, Min-Ju (부경대학교 기계공학부 냉동공조공학과)
Jang, Seong-Il (부경대학교 기계공학부 냉동공조공학과)
Oh, Hoo-Kyu (부경대학교 기계공학부 냉동공조공학과)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.31, no.6, 2007 , pp. 707-714 More about this Journal
Abstract
The heat transfer coefficient and Pressure drop during gas cooling process of $CO_2$ (R-744) in inclined helical coil copper tubes were investigated experimentally. The main components of the refrigerant loop are a receiver. a variable-speed pump. a mass flow meter, a pre-heater and a inclined helical coil type gas cooler (test section). The test section consists of a smooth copper tube of 2.45mm inner diameter. The refrigerant mass fluxes were varied from 200 to $600[kg/m^2s]$ and the inlet Pressures of gas cooler were 7.5 to 10.0 [MPa]. The heat transfer coefficients of $CO_2$ in the inclined helical coil tubes increases with the increase of mass flux and gas cooling pressure of $CO_2$. The pressure drop of $CO_2$ in the gas cooler shows a relatively good agreement with those Predicted by Ito's correlation developed for single-phase in a helical coil tube. The local heat transfer coefficient of $CO_2$ agrees well with the correlation by Pitla et al. However, at the region near pseudo-critical temperature. the experiments indicate higher values than the Pitla et al. correlation. Therefore. various experiments in the inclined helical coil tubes have to be conducted and it is necessary to develop the reliable and accurate prediction determining the heat transfer and pressure drop of $CO_2$ in the inclined helical coil tubes.
Keywords
Design of gas cooler; Heat transfer coefficient and pressure drop of $CO_2$; Inclined helical coil type heat exchanger;
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