Efficiency Comparison of Thermal Insulation Schemes in the Hinged Ventilated Facades Systems

Abstract

The article deals with the problems associated with the quality of thermal insulation mounting in hinged ventilated facades, and first of all associated with the gaps between thermal insulation panels. According to STO NOSTROY 2.14.67-2012 "Hinged facade systems with air gap. Work on the installation. General requirements for the production and control of work" the acceptable value of the unfilled seam is 2 mm. In reality, it is impossible to achieve the required width of the gap between the plates, and additional heat losses appear on single-layer thermal insulation schemes. The influence of the gaps between thermal insulation plates on the reduced total thermal resistance of the external wall with the hinged ventilated facade system is estimated using Russian and European calculation methods. The calculations were made in accordance with SP 50.13330.2012, SP 230.1325800.2015 and EN ISO 6946. Two outer wall constructions made of monolithic reinforced concrete and masonry from aerated concrete blocks and three options for insulation – single-layered and two double-layered – were adopted for the analysis. Optimal variants of thermal insulation and types of bases for fixing thermal insulation are offered. Three types of air layers are reviewed according to EN ISO 6946, and the third type – highly ventilated layer – is taken to calculations. The results of calculations of two-dimensional temperature fields, linear heat transfer coefficients, heat transfer performance uniformity factors and reduced total thermal resistances for 16 combinations of gaps in thermal insulation and bases are presented.