| Title |
Pool Boiling Heat Transfer Coefficient of HFC32/HFC152a on a Plain Surface |
| Authors |
강동규(Dong-Gyu Kang) ; 이요한(Yohan Lee) ; 정동수(Dongsoo Jung) |
| DOI |
http://dx.doi.org/10.6110/KJACR.2013.25.9.484 |
| Keywords |
핵비등 열전달계수 ; 대체냉매 ; 이원 혼합냉매 ; 증발기 ; 열전달 저하 Nucleate boiling heat transfer coefficient ; Alternative refrigerant ; Binary mixtures ; Evaporator ; Heat transfer deterioration |
| Abstract |
Nucleate pool boiling heat transfer coefficients (HTCs) are measured with HFC32/HFC152a mixture at several compositions. All data are taken at the liquid pool temperature of 7°C, on a horizontal plain square surface of 9.53×9.53 mm, with heat fluxes of 10 kW/m2 to 100 kW/m2 with an interval of 10 kW/m2, in the increasing order of heat flux. Test results show that the HTCs of these mixtures are up to 45% lower than those of the ideal HTCs calculated by a linear mixing rule with pure fluids’ HTCs, due to the mass transfer resistance associated with non-azeotropic refrigerant mixtures. Pool boiling data show the deduction in HTCs with an increase in GTD of the mixture. The present mixture data agree well with five well known correlations, within 20% deviation. |