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Effects on Refrigerant Maldistribution on the Performance of Evaporator  

Lee, Jin-Ho (School of Mechanical Engineering, Yonsei University)
Kim, Chang-Duk (Central Region Head Office, Korea Industrial Complex Corp.)
Byun, Ju-Suk (School of Mechanical Engineering, Yonsei University)
Jang, Tae-Sa (Department of Environmental Engineering, Gwangju University)
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International Journal of Air-Conditioning and Refrigeration / v.13, no.2, 2005 , pp. 107-118 More about this Journal
An experimental investigation was made to study two-phase flow distribution in a T-type distributor of slit fin-and-tube heat exchanger using R-22. Experiments were carried out under the conditions of saturation temperature of $5^{\circ}C$ and mass flow rate varying from 0.6 to 1.2kg/min. The inlet air has dry bulb temperature of $27^{\circ}C$, relative humidity of 50% and air velocity varying from 0.63 to 1.71m/s. A comparison was made between the predictions from the previously proposed tube-by-tube method and the present experimental data for the heat transfer rate of evaporator. Results show that $82.5\%$ increase of air velocity is needed for T-type distributor with four outlet branches than that of two outlet branches under the superheat of $5^{\circ}C$, which resulted in increasing of air-side pressure drop of $130\%$ for the former as compared to the latter.
Evaporator; Degree of superheat; Distributor; Circuit arrangement; Tube-by-tube method;
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