The Results of Field Studies of the Heat-Protective Qualities of Hinged Ventilated Facades in Moscow

The dynamics of changes in requirements and ideas about the calculations of the heat-protective qualities of the external enclosing structures of buildings is outlined. The data of full-scale measurements of the heat transfer resistance of walls with a hinged ventilated facade of seventy-six objects located on the territory of the city of Moscow are presented. The obtained actual values of heat transfer resistance are compared with the design values. An analysis of the causes and factors influencing the actual values of the thermal characteristics of ventilated facades has been carried out. Conclusions are drawn about the absence of a direct dependence of the heat-protective qualities of walls with external hinged facades on the thickness of the insulation layer. At the same time, for the same thickness of insulation, the actual heat transfer resistance of the walls of different buildings may differ three times. The facts have been identified and substantiated that, contrary to the established opinion, the base of the walls (reinforced concrete or, for example, masonry from wall blocks) has a significant impact on the heat transfer resistance of the structure. The heat transfer resistance of sections of walls with a reinforced concrete base is significantly lower than through sections with a base of masonry material, which is explained by the redistribution of heat flows through the reinforced concrete frame of the building. The resource of heat saving due to increasing the thickness of the wall insulation has been exhausted, further movement in this direction leads only to unjustified material costs. At present, the range of 2–3 m²∙^оС/W can be considered technically feasible in practice and economically viable resistance to heat transfer of the walls of buildings.

I.S. KURILIUK¹, Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.);
S.I. KRYSHOV², Candidate of Sciences (Engineering), (This email address is being protected from spambots. You need JavaScript enabled to view it.),
A.V. ERMAKOV², Engineer-Expert, (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ Research Institute of Building Physics, Russian Academy of Architecture and Construction Sciences (21, Lokomotivny Driveway, Moscow, 127238, Russian Federation)
² Center for Expertise, Research and Testing in Construction (GBU “TSEIIS”) (13, Ryazansky Prospect, Moscow, 109052, Russian Federation)

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