Thermal efficiency of the building envelope with the air layer and reflective coatings

Abstract

Currently, when calculating the heat-shielding qualities of external enclosing structures, the ability of fencing surfaces to reflect the heat flux by radiation is not taken into account. All this leads to an underestimation of heat-shielding characteristics in comparison with reality. Studies have shown. that a number of factors affect the thermal protection of air layers - the difference in temperature on the surfaces of the interlayer, its thickness. But the most important is the coefficient of elimination of the air gap surface. The use of reflective heat insulation with a low emissivity on one of the surfaces of the air gap makes it possible to increase its thermal protection 2.5–3 times. The article presents the calculations of thermal protection of air gaps with different emissivity coefficients of surfaces and conclusions about the effectiveness of the use of reflective insulation.

Thermal insulation of walls by using multiple air gaps separated by aluminum sheets

“…The surface emissivity also has a substantial impact on the thermal protection of the air layers. When the emission decreases from 0.6 W/m 2 K 4 to 0.2 W/m 2 K 4 , the thermal protection of the air gap increases by 4 times [3].…”

Thermal insulation of the tent’s heat shield in cold and hot climates

“…by applying a reflective layer to the outer layer, the air temperature in a tent is significantly reduced [9,10]. Reflective insulations used in various construction solutions of building partitions also significantly improve their thermal insulation [11]. Modification of the construction of building partitions through the use of various materials in thermal insulation layers, translates into lower costs of heating or cooling rooms, while ensuring appropriate thermal comfort conditions for people staying in them [12].…”

The Influence of the Relative Content of Peat and Mineral Binder on Thermal Insulation Composite Performance Characteristics

“…Various composite heat-insulating materials (HIMs) are used in the modern construction industry to create comfortable conditions while reducing energy and material costs during the construction and operation of buildings and structures (Gudkov et al, 2019;Latief et al, 2019;Ujma and Umnyakova, 2019;Pavlov et al, 2020). The distinctive characteristics of these materials are high porosity, low thermal conductivity, and average density to ensure their secondary use as sound-absorbing materials.…”