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Experimental Study on Characteristics of Evaporation Heat Transfer and Oil Effect of $CO_2$ in Mini-channels  

Lee, Sang-Jae (Department of Mechanical Engineering, Hanyang University)
Kim, Dae-Hoon (Department of Mechanical Engineering, Hanyang University)
Choi, Jun-Young (Korea Testing Laboratory)
Lee, Jae-Heon (Department of Mechanical Engineering, Hanyang University)
Kwon, Young-Chul (Department of Mechanical Engineering, Sunmoon University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.21, no.1, 2009 , pp. 16-22 More about this Journal
Abstract
In order to investigate $CO_2$ heat transfer coefficient and pressure drop by PAG oil concentration during $CO_2$ evaporation, the experiment on evaporation heat transfer characteristics in a mini-channels were performed. The experimental apparatus consisted of a test section, a DC power supply, a heater, a chiller, a mass flow meter, a pump and a measurement system. Experiment was conducted for various mass fluxes($300{\sim}800kg/m^{2}s$), heat fluxes($10{\sim}40kW/m^2$) saturation temperatures($-5{\sim}5^{\circ}C$), and PAG oil concentration(0, 3, 5wt%). The variation of the heat transfer coefficient was different according to the oil concentration. With the increase of the oil concentration, the evaporation heat transfer coefficient decreased and the delay of dryout by oil addition was found. Pressure drop increased with the increase of the oil concentration and heat flux, and the decrease of saturation temperature.
Keywords
$CO_2$; Evaporation heat transfer; Oil effect; Pressure drop; Mini-channels;
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