| Title |
The Experimental Study on the Heat Transfer of HFC134a forCondensation Tubes with Various Enhanced Surfaces |
| Keywords |
Condensation heat transfer ; 응축열전달 ; Enhanced tube ; 전열촉진관 ; Horizontal tube ; 수평관 ; Film Reynolds number ; 막레이놀즈수 ; HFC134a ; 냉매134a |
| Abstract |
The objectives of this paper are to study the characteristics of heat transfer for enhanced tubes(19.05mm) used in the condenser with high saturation temperatures and to provide a guideline for optimum design of a condenser using HFC134a. Three different enhanced tubes are tested at a high saturation temperature of 59.8℃(16bar); a low-fin and three turbo-C tubes.. The refrigerant, HFC134a is condensed on the outside of the tube while the cooling water flows inside the tube. The film Reynolds number varies from 130 to 330. The wall subcooling temperature ranges from 2.7℃ to 9.7℃. This study provides experimental heat transfer coefficients for condensation on the enhanced tubes. It is found that the turbo- C(2) tube provides the highest heat transfer coefficient. |