| Title |
Pool Boiling Heat Transfer Correlation for Pure Refrigerants |
| Authors |
고영환 ; 김종곤 ; 송길홍 ; 정동수 ; 김영일 |
| Keywords |
Pool boiling heat transfer ; 비등 열전달 ; Heat transfer coefficients ; 열전달계수 ; Alternative refrigerants ; 대체냉매 ; Correlation ; 상관식 |
| Abstract |
Pool boiling heat transfer coefficients (HTCs) of HCFC123, CFC11, HCFC142b, HFC134a, CFC12, HCFC22, HFC125 and HFC32 on a horizontal smooth tube have been measured. The experimental apparatus is specially designed to simulate the real heat transfer tube with the use of the secondary fluid of water as a heat source rather than a conventional electric heat source. Data were taken in the order of decreasing heat flux starting at 80 kW/m2 and ending at 5 kW/m2 in the pool temperature at 7℃. Test results showed that HTCs of HFC125, and HFC32 are 50∼67% higher than those of HCFC22. It is also found that some of the popular pool boiling heat transfer correlations in the literature are not good to predict the HTCs of newly developed alternative refrigerants. A new correlation was developed by a regression analysis which is based upon the consistent data obtained in this study and it showed an excellent agreement with all experimental data having an absolute mean deviation of less than 10%. |