Experiments to measure the heat transfer coefficient and the pressure drop in plate heat exchangers (PHEs) were performed pasteurization unit dairy industry. The test fluids we can use for hot fluid milk and cold fluid ammonia liquid. Plate heat exchangers with different chevron angles of 35ᶺ0, 30ᶺ0, 25ᶺ0, were used. Varying the flow rate, temperature, pressure, we measured the heat transfer coefficients and the pressure drops. Both the heat transfer coefficients and the pressure drop increased proportionally with the flow rate, temperature and the plate corrugation angle. The plate type heat exchangers have the advantages over the shell and tube heat exchanger for the heat recovery as large area can be provided in smaller space. If the experimental work enhances the overall heat transfer coefficient and its supports the system to improve the energy efficient and cost reduction. Correlations of the Nusselt number and the friction factor with the geometric parameters are suggested for the tested Plate Heat Exchanger.
