| Title |
Flow Condensation Heat Transfer Characteristic of R245fa in a Horizontal Plain Tube |
| Authors |
박현신(Hyun-Shin Park) ; 박기정(Ki-Jung Park) ; 정동수(Dongsoo Jung) |
| Keywords |
열전달계수 ; 흐름 응축 ; 냉매245fa ; 냉매123 ; 칠러 ; 응축기 Heat transfer coefficients(HTCs) ; Flow condensation ; R245fa ; R123 ; Chiller ; Condenser ; |
| Abstract |
Flow condensation heat transfer coefficients(HTCs) of R123 and R245fa are measured in a horizontal plain tube. The main test section in the experimental flow loop is made of a plain copper tube of 9.52mm outside diameter and 530mm length. The refrigerant is cooled by passing cold water through an annulus surrounding the test section. Tests are performed at a fixed saturation temperature of 50±0.2℃ with mass fluxes of 50, 100, 150 kg/m2s and heat flux of 7.3～7.7kW/m2. Heat transfer data are obtained in the vapor quality range of 10～90%. Test results show that the flow condensation HTCs of R245fa are overall 7.9% higher than those of R123 at all mass fluxes. The pressure drop of R245fa is smaller than that of R123 at the same heat flux. In conclusion, R245fa is a good candidate to replace ozone depleting R123 currently used in chillers from the view point heat transfer and environ-mental properties. |