Abstract
A Low-grade Thermal Energy Conversion (LTEC) is refocused as one of the renewable energy. For the LTEC and Refrigerator/Heat Pump, it is very important to enhance on the heat transfer of heat exchanger though the available temperature deference is smaller than conventional thermal system. On last our study, by using micro fabrication surface on plate evaporator, heat transfer coefficient of HFC245fa is enhanced. In this paper, the experimental performance test as evaporator is evaluated on comparison with various Freon. The results show the boiling heat transfer coefficient of HFC134a was larger than that of another Freon. Heat transfer coefficient of these working fluids is estimated using Lockhart-Martinelli parameter.
