Abstract
The absorption heat pump using water-LiBr solution as working fluid has widely been used for air-conditioning system in Japan. However, it is difficult to apply the system for various uses, such as the utilization of low temperature heat sources, refrigeration and air-source type heat pumps because of the properties of the working fluid. 2,2,2- Trifluoroethanol (TFE) /n-Methyl-2- Pyrrolidone(NMP)is expected to be one of the most useful working fluids for the absorption heat pump of such use. While a number of investigations are available for the heat transfer performal1ce of LiBr solution, no work has been carried out to find out the heat transfer coefficient of TFE/NMP mixtures although it is important to know the heat transfer performance of TFE/NMP mixtures to design each element of the heat pump.In this study, nucleate pool boiling heat transfer cofficients are measured for TFE/NMP mixtures in order to evaluate the heat transfer perfonnance in the generator which is one of the element of the heat pump.
