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An Experimental Study on the Evaporative Heat Transfer Characteristics of $CO_2$/Propane Mixtures Flowing Upward in Vertical Smooth and Micro-fin Tubes with an Outer Diameter of 5 mm  

Cho, Jin-Min (School of Mechanical and Aerospace Engineering, Seoul National University)
Kim, Min-Soo (School of Mechanical and Aerospace Engineering, Seoul National University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.21, no.4, 2009 , pp. 243-251 More about this Journal
Abstract
Refrigerant mixtures provide an opportunity to adjust their properties to fit design criteria and a possibility to create new blends that can improve heat transfer characteristics. Therefore, mixture of $CO_2$ and propane is chosen which may be a promising refrigerant and has good environmental compatibility. This paper presents measured heat transfer coefficient data during evaporation process of $CO_2$/propane mixtures flowing upward in vertical smooth and. micro-fin tubes. Smooth and micro-fin tubes with outer diameters of 5 mm and length of 1.44in were selected as test tubes. The tests were conducted at mass fluxes of 212 to $656kg/m^{2}s$, inlet temperatures of -10 to $30^{\circ}C$, heat fluxes of 15 to $60\;kW/m^2$ and for several compositions (75/25, 50/50, 25/75 wt%). Among $CO_2$/propane refrigerant mixtures, the heat transfer characteristics are much better than that of any compositions when the composition is 75/25 (wt%).
Keywords
Evaporation; $CO_2$/propane; Vertical Smooth Tube; Vertical Micro-fin Tube; Heat Transfer Coefficient; Pressure Drop;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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