At present, there is a standard procedure whereby the energy performance of buildings can be calculated, even before their realisation. However, this process is based on certain simplifications of input data, parameters of operation of buildings and human factor. The result therefore often does not correspond to the real use of the building. Therefore, the paper deals with the evaluation of the actual operation of the building against the assumption set out in the energy performance certificate. First, an analysis of existing meteorological data (long-term averages) is calculated. Based on the analysis an hourly calculation model of meteorological data is made. Additionally, the energy performance certificate is calculated or taken for the buildings. Then, a set of parameters is compiled into the energy performance calculation. Subsequently, the impact of the use of buildings on their energy performance will be evaluated in the form of coefficients. These coefficients compare the calculated values in the energy performance certificate of the building with the actual values come from the use of the building. The aim of the project is, on the basis of calculated data and coefficients, to set out measures that would lead to a more realistic and accurate calculation of the energy performance of buildings. the output is a computational program for modeling meteorological data, coefficients taking into account the operation of the building and the possibility to generate design measures that would reduce the differences.
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