Abstract
M.Ing.
Heat transfer and pressure drop characteristics during in-tube condensation of nonazeotropic
mixtures of R22/R142b in a smooth helically coiled copper tube with an
inside diameter of 8.11 mm are investigated. The experimental results are compared
with prediction from correlation. The coefficient of performance of.the heat pump
built and used for experiments has been studied. The mass flux of the refrigerant was
varied during the course of the experiments. At similar mass flow rate of fluids, the
average heat transfer coefficients for mixtures were lower than those for pure
refrigerant R22 used as reference for comparison. Also, the heat transfer coefficients
of all the refrigerants increased with increasing mass flux.