Condensation heat transfer coefficients of R22, R407C, and R410A on a horizontal plain, low fin, and turbo-C tubes |
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Authors: | Dongsoo Jung Chong-Bo Kim Soo-Min Hwang Kyung-Ki Kim |
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Affiliation: | Department of Mechanical Engineering, Inha University, Inchon, 402-751, South Korea |
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Abstract: | In this study, condensation heat transfer coefficients (HTCs) were measured on a horizontal plain tube, low fin tube, and Turbo-C tube at the saturated vapor temperature of 39 °C for R22, R407C, and R410A with the wall subcooling of 3–8 °C. R407C, a non-azeotropic refrigerant mixture, exhibited a quite different condensation phenomenon from those of R22 and R410A and its condensation HTCs were up to 50% lower than those of R22. For R407C, as the wall subcooling increased, condensation HTCs decreased on a plain tube while they increased on both low fin and turbo-C tubes. This was due to the lessening effect of the vapor diffusion film with a rapid increase in condensation rate on enhanced tubes. On the other hand, condensation HTCs of R410A, almost an azeotrope, were similar to those of R22. For all refrigerants tested, condensation HTCs of turbo-C tube were the highest among the tubes tested showing a 3–8 times increase as compared to those of a plain tube. |
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Keywords: | Heat transfer Mass transfer Condensation Tube Enhanced tube R22 R407C R410A Heat transfer coefficient MeasurementAuthor Keywords: Transfert de chaleur Transfert de masse Condensation Tube Surface augmenté e R22 R407C R410A Coefficient de transfert de chaleur Mesure |
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