This paper presents the performance results for a sensible heatstorage system. The system under study operates as an air source heatpump which stores the compressor heat of rejection as domestic hotwater or hot water in a storage tank that can be used as a heatsource for providing building heating. Although measurements weremade to quantify space cooling, space heating, and domestic waterheating, this paper emphasizes the space heating performance of theunit. The heat storage system was tested for different indoor andoutdoor conditions to determine parameters such as heating chargerate, compressor power, and coefficient of performance (COP). Thethermal storage tank was able to store a full charge of heat. Therate of increase of storage tank temperature increased with outdoortemperature. The heating rate during a charge test, best shown by thenormalized rate plots, increased with evaporating temperature due tothe increasing mass flow rate and refrigerant density. At higherindoor temperature during the discharge tests, the rate of decreaseof storage tank temperature was slower. Also, the discharge heatingrate decreased with time since the thermal storage tank temperaturedecreased as less thermal energy became available for use.
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