Abstract
The paper presents energy use for heating and ventilation (one of the energy performance components) determined in three ways. A case of a single family building located near Wroclaw in Poland is analyzed. The first and the second variant are both computational and the third presents actual measured energy consumption. Computational variants are based on the Polish methodology for the EPC (the Energy Performance Certificate). This methodology is based on ‘the Energy Performance of Buildings Directive 2010/31/EU’. Energy use for heating and ventilation is calculated using monthly method presented in EN ISO 13790. In the first computational option standard input data (parameters such as indoor and outdoor air temperature etc. are taken from standards and regulations) are implemented. In the second variant this input data are partially taken from measurements. The results of energy use from both computational variants are compared to the actual measured energy consumption. On the basis of this comparison the influence of three factors: solar radiation heat gains, building air tightness and the SCOP of the heat pump on energy use calculations are analyzed. Conclusions aim to point the differences between them and the actual energy consumption.
Highlights
In the common understanding of the buildings users the Energy Performance Certificate, prepared in connection with the requirements of Directive [1], should allow to estimate the real energy consumption and the rough cost of heating
Computational energy performance was determined due to monthly method presented in Polish translation of EN ISO 13790 [5] with additional assumptions presented in Polish regulations [2]: calculations do not take into account heat flux of thermal radiation to the sky from building elements
It was estimated that the real air tightness test result, the real solar radiation gains and the real SCOP of the heat pump were the most unsure among the assumptive input data in view of the lack of information on their values
Summary
In the common understanding of the buildings users the Energy Performance Certificate (the EPC), prepared in connection with the requirements of Directive [1], should allow to estimate the real energy consumption and the rough cost of heating. This idea is rather misleading and can cause some doubts. Performance certificates [2] (mostly in line with European standards) can give a result close to the real energy consumption for the analyzed building. The article attempts to answer the question: whether on the basis of measurements from this system supplemented by additional instantaneous measurements carried out by authors one can predict real energy consumption
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