Experimental Study on Condensation of Pure Refrigerants in Horizontal Micro-Fin Tube -Proposal of Correlations for Heat Transfer Coefficient and Frictional Pressure drop-

This paper deals with the condensation heat transfer and pressure drop of pure refrigerant in micro-fin tubes.The correlations for heat transfer and frictional pressure drop are proposed using experimental data for 11 micro-fin tubes with different fin dimensions, where test refrigerants were pure refrigerants R22, R123 and R134a.The proposed correlations are developed based on the correlation for void fraction micro-fin tube and the correlation for pressure drop of single phase flow in micro-fin tube.The predicted results show good agreement with experimental results within the deviation of about 30 % for both condensation heat transfer and pressure drop.Experimental results were also compared with previous correlations proposed for micro-fin tube.