Dynamic Performance of a Residential Air-to-Air Heat Pump.

摘要

Information is presented on the dynamic performance of a 5-ton air-to-air heat pump,which was installed in a residence in the Washington, D.C. area. The effect of part-load operation on the heat pump's COOLING and HEATING coefficients of performance (COP) was determined. When the pump operated in the heating mode at outdoor temperatures below 40F (4.4C), a considerable discrepancy was found to exist between the measured performance and the performance data supplied by the manufacturers. This discrepancy is apparently due to the adverse effects of frost buildup and defrosting of the outdoor coil. The seasonal performance factor (SPF) of the heat pump was estimated and then traced back to the power plant to obtain an EFFECTIVE SPF which is then compared with the performance which might be expected from fossil-fuel heating equipment.