Development of a predictive model for power consumption of air-to-water heat pumps for residential house

A calculation model for air-to-water heat pump for  space heating in residential house was developed.  This model is assumed to be used for labelling or  energy standards in Japan and parameters used in the  model are assumed to be identified in the facility test  by the manufactures. In order to simplify the test and  decrease the identified parameters, the model used  heat pump cycle model where the efficiency could be  calculated by the evaporation temperature and the  condensation temperature. Based on the steady-state  experiments, the authors clarified that the energy  consumption could be calculated by modifying the  heat pump cycle model with three parameters: heat  loss from refrigerant piping, compressor efficiency and auxiliary power consumption.