Experimental investigation on heat extraction from a rock bed heat storage system for high temperature applications

Authors

  • Denis Okello Department of Physics, Makerere University, PO Box 7062, Kampala
  • Ole J Nydal Department of Energy and Process Engineering, Norwegian University of Science and Technology, PO Box 7491, Trondheim
  • Karidewa Nyeinga Department of Physics, Makerere University, PO Box 7062, Kampala
  • Eldad J K Banda Department of Physics, Makerere University, PO Box 7062, Kampala

DOI:

https://doi.org/10.17159/2413-3051/2016/v27i2a1339

Keywords:

rock bed storage, heat extraction, air flow rates, boiling

Abstract

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.

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Published

2016-07-20

How to Cite

Experimental investigation on heat extraction from a rock bed heat storage system for high temperature applications. (2016). Journal of Energy in Southern Africa, 27(2), 30-37. https://doi.org/10.17159/2413-3051/2016/v27i2a1339