| Title |
Development of Pool Boiling Heat Transfer Correlation for Hydrocarbon Refrigerants |
| Keywords |
Nucleate pool boiling ; 핵비등 ; Heat transfer coefficients ; 열전달계수 ; Hydrocarbon refrigerants ; 탄화수소계 냉매 ; Flammable ; 가연성 |
| Abstract |
In this work, pool boiling heat transfer coefficients(HTCs) of hydrocarbon refrigerants are measured from a horizontal smooth tube of 19.0mm outside diameter. Tested pure·refrigerants are Propylene, Propane, Isobutane, Butane and Dimethylether(DME). The pool temperature was maintained at saturation temperature of 7℃ and heat flux was varied from 10kW/m2 to 80kW/m2 with an interval of 10kW/m2. Wall temperatures were measured directly by thermocouple hole of 0.5mm out-diameter, 152mm 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%. |