Conference Year



Plate heat exchanger, Local heat transfer, HFO refrigerant, Two phase flow


In the present study, condensation and evaporation local heat transfer coefficients of the R1234ze(E) inside a brazed plate heat exchanger were investigated by using a test section which is combined with two grooved stainless steel plates. In the test section, wall temperature distribution was measured. The test section consists of eight plates; two of them were processed herringbone for refrigerant flow channel other two flat plates are set for cooling plate for refrigerant, and another consist on cooling water flow channel. In order to measure local heat transfer and temperature distribution, five thermocouples were set at not only flow direction but also in the right and left sides of plates. Local heat flux and heat transfer coefficient were calculated from wall temperature distribution for downward and upward flow condition. And, the local heat transfer characteristics were discussed.Â