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http://dx.doi.org/10.5916/jkosme.2007.31.6.699

Cooling Heat Transfer Characteristics of CO2 in Helical Coil Type Gas Coolers  

Son, Chang-Hyo (부경대학교 기계공학부)
Jeon, Min-Ju (부경대학교 기계공학부 냉동공조공학과)
Oh, Hoo-Kyu (부경대학교 기계공학부 냉동공조공학과)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.31, no.6, 2007 , pp. 699-706 More about this Journal
Abstract
The cooling heat transfer coefficient and pressure drop of $CO_2$(R-744) in 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 2.45 and 4.55mm inner diameter The refrigerant mass fluxes were varied from 200 to $600 [kg/m^2s]$ and the inlet pressures of 9as cooler were 7.5 to 10.0 [MPa]. The heat transfer coefficients of $CO_2$ in helical coil tubes increase 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 food agreement with those Predicted by Ito's correlation developed for single-phase in helical coil tubes. Though a few correlation available with the data. the local heat transfer coefficient of $CO_2$ agrees well with those presented by Pitla et al. among the predictions. However at the region near pseudo-critical temperature. the experiment data indicate higher values than the Pitla et al. correlation.
Keywords
$CO_2$ heat pump; Gas cooley; Heat transfer; coefficient of $CO_2$; Helical coil type heat exchanger;
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