BD2009

In order to determine the causes of SHS (Sick House Syndrome), a field survey on indoor air quality and health conditions of occupants has been conducted for 8 years in 77 detached wooden houses in Japan. The result of this survey had been reported partly in the proceedings of Indoor Air 2008. In most of these houses...

The basic statistics of airtightness test results collected since 2002 in the Czech Republic are presented. The test results are compared with the limit values according to national standard CSN 730540-2. An overview of airtightness related requirements stipulated in this standard is introduced in short with an emphasis on the overall...

From the year 2007 the buildings must have energy efficiency calculations, which requirements are now part of Building Code Book. This is based on European Performance of Buildings Directive. This presentation will discuss about the results collected by VTT from multi-storey apartment houses and one-family houses mainly during...

So far, the ideal-tight typical cross section is usually considered at the evaluation of constructions with the help of hygrothermal simulation. Usually always appearing additional humidification at lightweight construction elements, caused by convection, is not considered so that impermeable constructions seem, contrary to practice, more favourable...

The developed method uses Radon as natural tracer gas, which appears everywhere in the nature hence in all buildings as well. Contrary to blowerdoor-measurement, pressure and suction areas are coevally available, depending on the pressure difference due to wind and temperature. Generally, suction areas overweight due to wind. Depending on...

When two adjacent residential buildings in Ludwigshafen were fully renovated in 2005/2006, energy efficiency was a focal point from the very beginning. One of the two buildings was so completely renovated using Passive House components that it now nearly meets the Passive House Standard for new buildings. The air-tightness of...

Air tightness of the building envelope contains important initial data for hygrothermal design and energy calculation. This study presents and analyses field measurements of air tightness of randomly selected Estonian apartment buildings (in total 136 apartments). Buildings were selected with different external walls: lightweight frame, concrete...

Attic moisture control is one of the key issues addressed by the hygrothermal design of wood-frame houses. In general, exfiltration and natural ventilation are recognized as the main factors in determining the hygrothermal behaviour of an attic. Thus, hygrothermal analysis using a network flow model should be performed in order to predict the...

The airtightness of office buildings influences energy use and thermal comfort. A leaky office building is likely to have a high use of energy and thermal discomfort. Except for a study carried out in the USA, the knowledge of real airtightness levels of buildings and their impact on the energy use is very low,. Therefore two different methods of...