24 June 2014
Part-load performance tests were made on recently developed multi-split type
electric heat pump air-conditioners for buildings with rated capacities of 45 kW (cooling) and 50 kW (heating). For the cooling performance test, the outdoor air temperature was changed from 20 ºC to 45 ºC, and the indoor thermal load was changed from 12.5% to 100% of the rated cooling capacity of the air conditioner. Cooling COPs were measured at 36 test points. For the heating performance test, COPs were measured at 31 test points. Based on the measured COPs and several thermal load models for business buildings, the annual energy
consumption and annual average COP of A/C were evaluated. Moreover, we proposed a new method to predict the annual average COP. In this method, variations of COP with the outdoor air temperature and the indoor thermal load were modeled based on COPs
measured at eight test points. The error of the annual average COP predicted by this method was smaller than 3% for thermal load models of a home appliance mass merchandiser but increased for a food supermarket.