PERFORMANCE OF AN AIR-TO-AIR HEAT-PUMP UNDER FROSTING AND DEFROSTING CONDITIONS

In order to investigate the performance of air-to-air heat pumps for r esidential heating in the Black Sea region of Turkey, an experimental set-up was constructed. An electrically driven air-to-air heat pump wa s used for heating a laboratory building with a floor of 75 m2. In thi s study, a high-efficiency air-to-air residential heat pump was instru mented and tested in the heating mode under laboratory conditions. The coefficient of performance and heating capacity of the system were me asured during steady-state, dehumidifying, and frosting/defrosting con ditions. The study encompassed an evaluation of system and component p erformance for ambient temperature levels between 10 and -4.0-degrees- C and for discrete relative-humidity levels ranging from 65 to 80%.