Critical Values for the Temperature Factor to Assess Thermal Bridges

Kriitilised temperatuuriindeksid eesti Elamute külmasildade hindamiseks

Targo Kalamees

《Proceedings of the Estonian Academy of Sciences.Engineering》 12卷3-1期 (2006/09) Pp. 218-229

並列摘要

Climate analysis was conducted to determine the value for the temperature factor to be used for the design and infrared thermography inspections of Estonian dwellings to assess thermal bridges of the building envelope. For this analysis, data about the outdoor climate were retrieved from six weather stations, covering a 31-year period, from 1970 to 2000. For the indoor boundary conditions, the critical values from field measurements in detached houses were used. The aim was to avoid surface condensation and mould growth. Critical values of the temperature factor were calculated for different indoor humidity and temperature conditions. It was found that to avoid the mould growth on the thermal bridges in dwellings with a moisture excess of +6g/m^3 during the cold period and +2.5g/m^3 during the warm period (apartments with high occupancy or low ventilation) the spot temperature factor ƒ(subscript Rsi) should be greater than 0.80. For surface condensation, the limit value is ƒ(subscript Rsi). In dwellings with a moisture excess during the cold period +4g/m^3 and during the warm period +1.5g/m^3 (commonly detached houses: low occupancy and normal ventilation), to avoid the mould growth the ƒ(subscript Rsi) is needed and for surface condensation ƒ(subscript Rsi)≥0.55.

並列關鍵字

temperature factor ； infrared thermography ； thermal bridge