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External Condensation Heat Transfer Coefficients of R22 Alternative Refrigerants and R134a According to the Saturated Vapor Temperature Change on an Enhanced Tube  

Yoo Gil-Sang (Graduate School, Inha University)
Hwang Ji-Hwan (Graduate School, Inha University)
Park Ki-Jung (Graduate School, Inha University)
Jung Dongsoo (Department of Mechanical Engineering, Inha University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.17, no.11, 2005 , pp. 981-989 More about this Journal
Abstract
In this study, external condensation heat transfer coefficients (HTCs) are measured on a low fin tube and Turbo-C tubes at the saturated vapor temperature of $30^{\circ}C$, $39^{\circ}C$, and $50^{\circ}C$ for R22, R410A, R407C and R134a with the wall subcooled at $3{\~}8^{\circ}C$. The HTCs of all refrigerants decreased as increasing the saturation temperature from $30^{\circ}C$ to $50^{\circ}C$. This trend is due to better thermodynamic properties of the liquid phase at low temperature Beatty and Katz's prediction yielded a $20.0\%$ deviation for the low fin tube data. The heat transfer enhancement factors for the 26 fpi low fin tube and Turbo-C tubes are 4.0${\~}$5.5 and 3.0${\~}$8.1 respectively for the refrigerants tested. Finally the performance of Turbo-C tube is better than that of the low fin tube.
Keywords
Condensation heat transfer; Alternative refrigerant; HTCs; R22; R410A; R407C; R134a;
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