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Development of Pool Boiling Heat Transfer Correlation for Hydrocarbon Refrigerants  

Park Ki-Jung (Graduate School, Inha University)
Baek In-Cheol (Graduate School, Inha University)
Jung Dong-Soo (Department of Mechanical Engineering, Inha University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.18, no.3, 2006 , pp. 247-253 More about this Journal
Abstract
In this work, pool boiling heat transfer coefficients (HTCs) of hydrocarbon refrigerants are measured from a horizontal smooth tube of 19.0 mm outside diameter. Tested pure refrigerants are Propylene, Propane, Isobutane, Butane and Dimethylether (DME). The pool temperature was maintained at saturation temperature of $7^{\circ}C$ and heat flux was varied from $10kW/m^2$ to $80kW/m^2$ with an interval of $10kW/m^2$. Wall temperatures were measured directly by thermocouple hole of 0.5 mm out-diameter, 152 mm long and inserting ungrounded sheathed thermocouples from the side of the tube. Tested results show that HTCs of Propane, Propylene are 2.5%, 10.4% higher than those of R22 while those of Butane and Isobutane are 55.2%, 44.3% lower than those of R22 respectively. For pure refrigerants, new correlation can be applied to all of CFCs, HCFCS, HFCs, as well as hydrocarbons was developed. The mean deviation was 4.6%.
Keywords
Nucleate pool boiling; Heat transfer coefficients; Hydrocarbon refrigerants; Flammable;
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