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)

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 Ø_v and X_ttare Lockhart-Martinelli parameters, G is the total mass velocity, g is the gravitational acceleration, d is the inner diameter, and ρv and ρ_lAre 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%.