Abstract
Stratified water storage tanks are used for storing solar heat for space heating and domestic hot water in one device. When this kind of storage is used in combination with a heat pump, the temperature stratification of the storage is a decisive factor for the overall efficiency and thus for the consumed end energy of the system.Six storage devices from different manufacturers were tested in the laboratory. The results show that the new KPI for stratification efficiency of the storage system correlates well with the simulated and emulated electricity demand of a heat pump that is charging the storage. While the stratification efficiency was the decisive factor for the energetic performance of the system, the determined heat losses of the storage system showed no correlation with the overall energetic performance of the system.
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