抄録
It is requested to develop a small and highly efficient heat exchanger for small size energy equipment such as fuel cells and CO_2 heat pumps. In the present study, the high pressure resistant microchannel heat exchanger had been developed. The device can bear extremely high pressure condition because it is manufactured by diffusion bond technique. The heat transfer area for each volume of this device is quite large. Since the distance between the microchannels in the device is small, the thermal resistance is small. Due to quite high pressure resistance, this device is expected to be applied high flow rate condition with boiling and condensation. The objectives of the present study are to estimate the heat transfer characteristics of the present heat exchanger. Pressure drop, friction coefficient, heat transfer rate and overall heat transfer coefficient are measured with air, water and vapor as working fluids. As the results, it is clarified that above features make the device to achieve very high performance as more than hundred times larger heat transfer rate than that of the existing heat exchanger.
