Heat transfer and pressure drop characteristics of plate heat exchanger of R22 and R32

Abstract

The local and average heat transfer coefficients and pressure drops during condensation and evaporation were reported for R22 and R32 in the plate heat exchanger. The experiment data showed that both the heat transfer coefficients and pressure drop increased with the mass flow rate. At higher mass flow rates, the heat transfer coefficients and pressure drop were higher for the entire range of mass flow rates. Raising the imposed heat flux had a smaller effect on the heat transfer coefficients and pressure drops both the heat transfer coefficients and pressure drops were lower. The measured heat transfer coefficients and pressure drops were also compared with a number of correlations for condensation and evaporation. On the basis of the experiment data, we propose empirical correlations for the heat transfer coefficient and friction factor.sure drop increased with the mass flow rate. At higher mass flow rates, the heat transfer coefficients and pressure drop were higher for the entire range of mass flow rates. Raising the imposed heat flux had a smaller effect on the heat transfer coefficients and pressure drops both the heat transfer coefficients and pressure drops were lower. The measured heat transfer coefficients and pressure drops were also compared with a number of correlations for condensation and evaporation. On the basis of the experiment data, we propose empirical correlations for the heat transfer coefficient and friction factor.