High consumption of energy for operation negatively influences economy. The increased losses by ventilation directly increase the heat demand for heating purposes, in some cases up to 10%. Undesirable and uncontrolled leakage of air from the inside through the building envelope to the outside will reduce efficiency of the thermal insulation, reduce heat resistance of the structure and increase losses by ventilation. Īirtightness of Energy Efficient BuildingsĪirtightness is characterized by air leakage through the external wall and it is a key component of energy efficient buildings. If the building envelope is perfectly airtight, there are not any ventilation gaps and leaks in the external cladding. The heat typically escapes in connections of structures and materials. If the building envelope is not airtight enough, heat escapes most of the year from the inside to the outside through cracks, joints and leaks. Except for the EU countries in the south of Europe, in the typical climate the temperatures of air inside the building are, for most days of the year, higher than the temperature of the outdoor air. Īirtightness, this means the ability of the building envelope not to let in/out the air, is among key preconditions for energy efficient constructions which may reduce energy performance of the buildings. Among others, it is required to make each and every effort to comply with commitments resulting from the Kyoto Protocol on Climate Changes and to keep the increase of global temperature below 2 ☌ as well as the commitment to reduce by 2020 total emissions of greenhouse gases at least by 20 % against values of 1990. In line with the approved revision of the European Parliament and Council Directive 2010/31/ EU on energy performance of buildings of 2010, the European Union member states are required to take measures which will reduce consumption of energy. A reasonable and careful use of energy from non- renewable resources which are now the main source of energy as well as use of alternative natural sources make it possible to reduce considerably consumption of energy and keep sources of energy for future generations in line with principles of sustainable construction. In accordance with energy principles which apply with respect to sustainable building processes, measures should be taken which could reduce energy dependence and emissions of carbon dioxide. In EU member states, buildings consume now more than 40 % of energy. Key words - Airtightness air permeability energy performance energy efficient building IntroductionĪccording to laws in force, the construction process is required to be as efficient as possible in terms of energy because the building industry is growing and more and more energy is needed.
The obtained results were presented at the conference ACE 2013 in Singapore, ICEET 2013 in Kunming and they were also published in the scientific journal JET 2013. Quality design of the building envelope contributes to the principles of sustainable building. The objective of the paper is defining and characterizing parameters and variables influencing the airtightness of energy efficient buildings. Energy efficient buildings situated in areas with lots of wind and in exposed locations could constitute up to 10 % of total heat consumption. Untightness leads to uncontrolled air exchange and increased heat loss.
One of the basic principles of energy efficient buildings is perfectly airtight envelope of buildings. The paper deals with the energy performance of buildings with regard to the requirements of Directive 2010/31/ EU of the European Parliament and of the Council of on the energy performance of buildings. 10 Related articles on Designing Buildings.6 Influence of Building’s Parameters on Airtightness.5 SWOT Analysis of Building Airtightness.4 Importance of Airtightness in Energy Efficient Building.3 Airtightness of Energy Efficient Buildings.
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