Experimental correlation of pool boiling heat transfer for HFC134a on enhanced tubes: Turbo-E |
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Authors: | Seung Woo Yang Jinhee Jeong Yong Tae Kang |
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Affiliation: | aSchool of Mechanical and Industrial System Engineering, Kyung Hee University, Yong In, Gyeong-Gi 449-701, Republic of Korea;bMachinery R&D Group, LS Cable Inc., Gyeong-Gi 431-080, Republic of Korea |
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Abstract: | The objectives of this paper are to study the heat transfer characteristics for enhanced surface tubes in the pool boiling and to provide a guideline for the design conditions for the evaporator using HFC134a. The shape of tube surfaces, the wall superheat, and the saturation temperature are considered as the key parameters. Copper tubes (do = 19.05 mm) are treated with different helix angles and the saturation temperatures are controlled from 3 to 16 °C. It is found that the pool boiling heat transfer coefficient decreases with increasing the wall superheat. It is also found that boiling heat transfer coefficients for Turbo-II and Turbo-III are 1.5–3.0 times and 1.2–2.0 times higher than that for Turbo-I without the helix angle, respectively. The higher heat transfer performance from Turbo-II and Turbo-III can be explained by the “bubble detention” phenomenon on the surface without the helix angle for the Turbo-I. The experimental correlations for the pool boiling heat transfer on the present enhanced tubes without (Type I) and with the helix angle (Type II and Type III) are developed with the error bands of ±30%, respectively. |
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Keywords: | Refrigeration system Evaporator Pool boiling R134a-tube Enhanced surface Experiment Correlation Heat transfer coefficientMots clé s: Systè me frigorifique É vaporateur É bullition libre R134a-tube Surface augmenté e Expé rimentation Corré lation Coefficient de transfert de chaleur |
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