Ventilation heat loss in a multifamily building under varying air density
Abstract
Standards related to calculation methods used in building energy performance simulation tools usually impose constant volumetric heat capacity of air. However, this simplification may result in errors if the actual conditions differ from the assumptions made. The paper presents the problem of dry air density and specific heat capacity variation and their influence on calculated energy use for space heating in a multifamily building. The monthly calculation method of PN-EN ISO 13790 was used. Simulations were performed in five cities, each in one climatic zone according to PN-EN 12831. Variation of the air density caused by air temperature and elevation resulted in differences in calculated heating demand from -4.5% to 4.5% in relation to that at constant volumetric heat capacity assumed in PN-EN ISO 13790.
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Author Biography
Piotr Michalak received Ph.D degree in Energy Machines and Equipment from AGH, Kraków. Since 2009 he has been a researcher in the Department of Power Systems and Environmental Protection Facilities at the AGH. His scientific interests focus on problems concerning energy modelling and thermal dynamics of buildings, utilisation of renewable energy sources, CFD simulations and thermal and flow measurements. He is the author or co-author of 61 scientific papers.
Copyright (c) 2020 Piotr Michalak
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