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Journal of Energy in Southern Africa

On-line version ISSN 2413-3051
Print version ISSN 1021-447X


OKELLO, Denis; NYDAL, Ole J.; NYEINGA, Karidewa  and  BANDA, Eldad J. K.. Experimental investigation on heat extraction from a rock bed heat storage system for high temperature applications. J. energy South. Afr. [online]. 2016, vol.27, n.2, pp.30-37. ISSN 2413-3051.

Solar energy is available in an intermittent way, and integrating an energy storage system with solar energy collection devices may promote uninterrupted supply of energy in the absence of the availability of solar energy. It has been shown that heat can be stored using rocks packed in a bed, but limited work has been reported on heat extraction from a charged rockbed. This paper reports on the heat extraction from a charged rock bed. Discharging tests were performed under different air flow conditions and initial bed temperatures. Without the blower, the discharging rate is very slow. The discharging rate can be increased, and the cooking time controlled by adjusting the air speed through the rock-bed system.

Keywords : rock bed storage; heat extraction; air flow rates; boiling.

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