AUTHORS: Hana Charvatova, Martin Zalesak
Download as PDF
ABSTRACT: The paper deals with the use of computer tools for assessing of the thermal stability of buildings. It describes the procedure developed for determining of a time constant for cooling down of the room and a coefficient α whose values are related to the building’s thermal-accumulation properties. The developed methodological procedure is based on processing of the data obtained by measuring in the real building object, computer simulations in COMSOL Multiphysics software and subsequent processing of the output data in MAPLE and MATLAB software with regard to compliance with valid European and Czech technical standards used in building industry and Architecture. The studied model of the room showed the dependence of the time constant and the coefficient α on thickness and specific heat capacity of the thermal insulation of the external wall under the selected winter conditions. The studied example also proved correlation between the coefficient α and the time constant of the room.
KEYWORDS: Thermal stability assessment, cooling down of the room, coefficient α, time constant of the room, computer simulation
REFERENCES:
[1] CSN EN 13790: Energy performance of buildings - Calculation of energy use for space heating and cooling, Office for Standards, Metrology and Testing, Prague 2009
[2] CSN EN 13792: Thermal performance of buildings - Calculation of internal temperatures of a room in summer without mechanical cooling - Simplified methods, Czech Standards Institute, Prague 2005
[3] CSN EN 13786: Thermal performance of building components - Dynamic thermal characteristics - Calculation methods, Office for Standards, Metrology and Testing, Prague 2008
[4] CSN EN 15251: Indoor environmental input parameters for design and assesment of energy performance of buildings addressing indoor air quality, thermal environment, lighting and acoustics, Office for Standards, Metrology and Testing, Prague 2011
[5] CSN 06 0220: Heating systems in buildings Dynamic behaviour, Czech Standards Institute, Prague 2006
[6] CSN 73 0540: Thermal protection of buildings, Office for Standards, Metrology and Testing, Prague 2011
[7] V. Gerlich, Verification of Possibility of Using COMSOL Multiphysics as Simulation Tool for Heat Transfer Calculation in Systems with Accumulation, Thesis, Tomas Bata University in Zlin, Zlin, 2012
[8] H. Charvatov ´ a and M. Z ´ ale ´ sˇak, Calculation of ´ Heat Losses of the Room with Regard to Variable Outside Air Temperature, Proceedings of the 19th International Conference on Systems. Recent Advances in Systems, Zakynthos Island, Greece, WSEAS Press, 2015, pp. 627-631
[9] Heat Transfer Module Users Guide, COMSOL 2012
[10] G. Nikishkov, Introduction to the Finite Element Method, University of Aizu 2003
[11] H. S. Carslaw and J. C. Jaeger, Conduction of Heat in Solids, Clarendon Press, Oxford 1986