Assessment of buildings with ventilated facade systems and evaluation of point thermal bridges

Abstract

Analyzes of influence of the point thermal bridges of buildings with ventilated facade systems on the thermal properties of envelops are presented in the paper. The relation between the separate components of the envelop were made: thermal properties and thickness of supporting wall’s layer; value of thermal conductivity and thickness of insulation layer. Studies have shown, that the value of the point thermal transmittance, which depended on the thermal properties of the envelop and thickness of the layers, might increase to 35%. The higher thermal conductivity coefficient of the material of the supporting wall and thickness of the insulation layer, the larger value the point thermal transmittance. And contrary, if the thickness of the supporting wall and coefficient of thermal conductivity of insulation layer was increased, the value the point thermal transmittance was decreased. It is possible to determine the value of thermal bridges of certain construction design solution by simplified calculations, according to the existing dependencies formulas or graphics. In this case it’s necessary to have dependence of the point thermal bridges from thermal insulation properties and dimensions of envelop layers. DOI: http://dx.doi.org/10.5755/j01.sace.11.2.12606