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Energies 2014, 7(8), 4972-4987;

Impact of Air Tightness on the Evaluation of Building Energy Performance in Lithuania

Institute of Architecture and Construction, Kaunas University of Technology, Tunelio st. 60, LT-44405 Kaunas, Lithuania
Faculty of Civil Engineering and Architecture, Kaunas University of Technology, Studentų st. 48, LT-51367 Kaunas, Lithuania
Author to whom correspondence should be addressed.
Received: 9 April 2014 / Revised: 11 July 2014 / Accepted: 22 July 2014 / Published: 4 August 2014
(This article belongs to the Special Issue Energy Efficient Building Design and Operation 2014)
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In order to fulfil the European Energy Performance of Buildings Directive (EPBD) requirements for the reduction of energy consumption, European national requirements have been created for building envelope thermal properties and calculation methodology to determine if building energy efficiency is created. This is however not true in all methodologies. The necessity of building air tightness appears only for new A class buildings, and there are no requirements for air tightness for other building classes. Therefore, the aim of this work is to improve the methodology for the calculation of energy efficiency of buildings, while taking into account the air tightness of the buildings. In order to achieve this aim, the sum energy consumption of investigated buildings was calculated, energy efficiency classes were determined, air tightness of the buildings was measured, and reasons for insufficient air tightness were analyzed. Investigation results show that the average value of air tightness of A energy efficiency class buildings is 0.6 h−1. The results of other investigated buildings, corresponding to B and C energy efficiency classes, show insufficient air tightness (the average n50 value is 6 h−1); herewith, energy consumption for heating is higher than calculated, according to the energy efficiency methodology. This paper provides an energy performance evaluation scheme, under which performed evaluation of energy performance of buildings ensures high quality construction work, building durability, and the reliability of heat-loss calculations. View Full-Text
Keywords: infiltration; blower door; air tightness; energy; building infiltration; blower door; air tightness; energy; building

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Šadauskienė, J.; Paukštys, V.; Šeduikytė, L.; Banionis, K. Impact of Air Tightness on the Evaluation of Building Energy Performance in Lithuania. Energies 2014, 7, 4972-4987.

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