A basic condition for low energy houses is a demand controlled ventilation combined with an air-tight building envelope. Within the scope of different research projects financed by public grants and measurements effected by private order mainly in the south of Germany, the airtightness in low energy and minimum energy houses has been checked according to the DC pressurization method and the places of leakage have been determined. Considering the results with respect to the recommendations of the SIA 180 (standard of Switzerland), 40% of approx.
A sudden contamination of the outdoor air by some toxic gas can have several causes. To find out the protection afforded by sheltering indoors was the primary goal of the investigation. The object of the computational approach was a single family house with 2 floors. Three different models were utilized to calculate the infiltration air flows, the contaminant transport inside the building and the temperature decay of the building.
The aim of the study was to design and build a small house with 50% lower heating energy consumption than in typical existing Finnish small houses. Energy saving is based on three technologies: super insulation, airtight construction and ventilation heat recovery. The first monitoring results show the heating energy consumption of the house to be less than half of the measured consumption of typical small houses located in the same area. Also, the results show the air quality to be good.
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