Measured and Calculated Performances of a Duct Heat Storage Fed by Solar Panels and Coupled with a Gas Heat Pump

Pahud, Daniel (1994) Measured and Calculated Performances of a Duct Heat Storage Fed by Solar Panels and Coupled with a Gas Heat Pump. In: 6th International Conference on Thermal Energy Storage Calorstock'1994, 22-25 August 1994, Espoo, Finland.

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Abstract

This study describes and analyses an active solar system which equips an industrial building. The measured performances of the solar panels, the diffusive duct storage, as well as the heat pump are presented. They do not exhibit the anticipated performances, as the heat pump did not work properly. In order to obtain an evaluation of the active solar system, the performances of the components are recalculated. A global solar efficiency of 27% is assessed. A substitution heat balance is established: one kilowatt-hour extracted from storage or solar panels gives a saving of 0.7 kilowatt-hours of gas. The behaviour of the duct ground heat storage is analysed in detail. The temperature difference between the heat carrier fluid and the average temperature level of the storage shows the limits of utilisation of the duct storage.

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