Nucleate boiling heat transfer coefficients of flammable refrigerants |
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Authors: | Dongsoo Jung Heungseok Lee Dongsoo Bae Sukjae Oho |
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Affiliation: | a Department of Mechanical Engineering, Inha University, Incheon 402-751, South Korea;b Inha University, Incheon, 402-751, South Korea;c TechnoChem Co., Ltd., Seotan-Myun, Pyungtaek-Si, Kyunggi-Do, South Korea |
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Abstract: | Nucleate boiling heat transfer coefficients (HTCs) of propylene (R1270), propane (R290), isobutane (R600a), butane (R600), and dimethylether (RE170) on a horizontal smooth tube of 19.0 mm outside diameter have been measured. The experimental apparatus was specially designed to accommodate high vapor pressure refrigerants such as propylene and propane with a sight glass. A cartridge heater was used to generate uniform heat flux on the tube. Data were taken in the order of decreasing heat flux from 80 kW m−2 to 10 kW m−2 with an interval of 10 kW m−2 in the pool temperature of 7 °C. Test results exhibited a typical trend that HTCs of flammable refrigerants increase with increasing vapor pressure. Existing nucleate boiling heat transfer correlations showed up to 80% deviation as compared to the present data. Hence a new correlation was developed through a regression analysis taking into account dimensionless variables affecting nucleate boiling heat transfer. The new correlation showed a good agreement with data for flammable refrigerants as well as halogenated refrigerants with a deviation of 5.3%. |
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