Heat stored in a solid block as source of heating energy

Author(s): Tibor Horváth, Zoltán Pásztory
Innovation Center, University of West Hungary, Sopron, 9400, Hungary
International Journal of Smart Grid and Clean Energy, vol. 4, no. 2, April 2015: pp. 119-124
ISSN: 2315-4462 (Print)
ISSN: 2373-3594 (Online)
Digital Object Identifier: 10.12720/sgce.4.2.119-124

Abstract: In present work, the possibility was explored to use a solid block for space heating. The block was placed in a test house with low energy characteristics. Computations revealed that heating period greatly depended on the rate of heat withdrawal. With a rate of 122 W, the required indoor temperature (20ºC) could be maintained for a heating period of 150 days. Larger part of stored energy used for space heating by heat seepage through the block insulation (~48%) and by withdrawing the heat (~38%). Loss to the ground amounted to ~14% of the total energy content of block (~3.5 GJ). This experiment substantiated the viability of space heating by a thermal energy storage system. The heating block had the ability to provide 8.28 kWh/(m2⋅yr) which is a realistic scenario with regards to the heating demands of passive houses. Finite element method proved to be very useful for simulation scenarios.
Keywords: Heat loss, insulation, low energy house, space heating, thermal energy storage
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