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The Experimental Study on the Heat Transfer of HFC134a for Condensation Tubes with Various Enhanced Surfaces  

Park Chan-Hyoung (Graduate School of Mechanical Engineering, Kyung Hee University)
Lee Young-Su (Korea Institute of Energy Research)
Jeong Jin-Hee (LG Cable Ltd.)
Kang Yong-Tae (School of Mechanical and Industrial Systems Engineering, Kyung Hee University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.18, no.8, 2006 , pp. 613-619 More about this Journal
Abstract
The objectives of this paper are to study the characteristics of heat transfer for enhanced tubes (19.05 mm) used in the condenser with high saturation temperatures and to provide a guideline for optimum design of a condenser using HFC134a. Three different enhanced tubes are tested at a high saturation temperature of $59.8^{\circ}C$ (16 bar); a low-fin and three turbo-C tubes.. The refrigerant, HFC134a is condensed on the outside of the tube while the cooling water flows inside the tube. The film Reynolds number varies from 130 to 330. The wall subcooling temperature ranges from $2.7^{\circ}C$ to $9.7^{\circ}C$. This study provides experimental heat transfer coefficients for condensation on the enhanced tubes. It is found that the turbo-C(2) tube provides the highest heat transfer coefficient.
Keywords
Condensation heat transfer; Enhanced tube; Horizontal tube; Film Reynolds number; HFC134a;
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