| Title |
Flow Condensation Heat Transfer Characteristicof Hydrocarbon Refrigerants and DME in Horizontal Plain Tube |
| Authors |
박기정(Ki-Jung Park) ; 이민행(Min-Hang Lee) ; 박현신(Hyun-Shin Park) ; 정동수(Dongsoo Jung) |
| Keywords |
열전달계수 ; 흐름 응축 ; 냉매22 ; 프로필렌 ; 프로판 ; 디메틸에테르 ; 이소부탄 Heat transfer coefficients ; Flow condensation ; R22 ; Propylene ; Propane ; DME ; Isobutane |
| Abstract |
Flow condensation heat transfer coefficients(HTCs) of R22, propylene, propane, DME and isobutane are measured on a horizontal plain tube. The main test section in the experimental flow loop is made of a plain copper tube of 9.52 mm outside diameter and 530 mm length. The refrigerant is cooled by passing cold water through an annulus surrounding the test section. Tests are performed at a fixed refrigerant saturation temperature of 40±0.2℃ with mass fluxes of 100, 200, 300kg/m2s and heat flux of 7.3～7.7kW/m2. The data are obtained in the vapor quality range of 10～90%. Test results show that at same mass flux the flow condensation HTCs of propylene, propane, DME and isobutane are higher than those of R22 by up to 46.8%, 53.3%, 93.5% and 61.6% respectively. Also well-known correlations developed based upon conventional fluorocarbon refrigerants predict the present data within a mean deviation of 30%. Finally, the pressure drop increase as the mass flux and quality increase and isobutane shows the highest pressure drop due to its lowest vapor pressure among the fluids tested. |