Two-Phase Flow Thermal Hydraulic Performance of Stacked High Pressure Resistance Microchannel Heat Exchanger

Abstract

Recently, development of a small and high efficient heat exchanger, which is utilized in a fuel battery and a heat pump system for CO 2 refrigerant and so on, is strongly required. In author's previous study, a prototype of stacked high pressure resistance microchannel heat exchanger manufactured with diffusing bond technique has been proposed. In the present study, the objective is to reveal flow and heat transfer properties of this microchannel heat exchanger when water and vapor are employed as low-and high-temperature fluids, respectively. Pressure drop and heat transfer rate are measured as flow and heat transfer properties, respectively. As the results, it is identified that the cross-flow heat exchanger operates as a condenser with small pressure drop of less than 60 kPa. Heat transfer rate of it is approximately 7500 W despite the weight of 240 g. Counter-flow heat exchanger indicates high heat transfer properties as heat transfer rate of approximately 9000 W.