2016 Volume 41 Issue 237 Pages 1-10
These studies aim at developing a performance prediction tool for a heat pump system taking the refrigeration cycle into consideration. This paper constitutes Part 1 in this series of studies. In this paper, it is indicated that the physics model of a heat pump system can be simplified on the basis of the calculation equation of the compressor. The authors simplified the physics model's calculation and developed an annual performance prediction tool for the heat pump system taking the refrigeration cycle into consideration. In this design tool, the calculated condition can be obtained by using the heat pump system's specification form and the annual performance can be calculated with high speed. In addition, it is possible to change a part of the equipment constituting the heat pump system such as the evaporator, condenser, and compressor. This tool can also perform calculation for the heat pump system with the control that the refrigerant's evaporating or condensing temperature is kept constant. The energy consumption of the water source variant refrigerant flow heat pump system installed in the office building was calculated by using the tool and compared to the measured consumption. The results showed that the relative errors between the calculated energy consumption and the measured consumption are 1.0% for the summer and 4.8% for the winter, respectively. Therefore, it is confirmed that the developed tool can predict the annual performance of the heat pump air conditioning system with acceptable precision.
