Condensation of Refrigerants HCF C 22, HFC 134a and HCFC 123 in a Horizontal Smooth Tube: (1st Report, Proposals of Empirical Expressions for the Local Frictional Pressure Drop)

Abstract

An experimental study of condensation of refrigerants HCFC 22, HFC 134a and HCFC 123 inside a horizontal smooth tube is presented. The test condenser is a double-tube counter-flow type, where the refrigerant flows inside the inner tube and the cooling water flows counter-currently in the outer annulus. The inner tube made of copper is of 6.0 m length and 8.4 mm inner diameter. The measured values for the frictional pressure drop are correlated as (formula omitted), where Øv and Xttare Lockhart-Martinelli parameters, G is the total mass velocity, g is the gravitational acceleration, d is the inner diameter, and ρv and ρlAre the densities of vapor and liquid, respectively. The static pressure drop calculated using this correlation equation agrees with the measured values within the error of 0~ —5%. © 1994, The Japan Society of Mechanical Engineers. All rights reserved.