Calculation of the heat insulation of the building walls is an important stage of the design process. Additional heat losses arise from the thermal conductive inclusions such as interfloor bridging, window slopes, balcony plates, brackets of the system of the insulation facing and the other essential elements of the facade.
It is necessary to calculate these losses for accurate determination of the overall thermal resistance value.
Problem type: Plane-parallel problem of heat transfer.
Geometry:
Given: Temperature inside the room: T1 = +20 °C;
Temperature outside the room (ambient air): T2 = -32 °C.
Layer, material
Layer thickness [m]
Material density [kg/m3]
Thermal conductivity W/(m·K)
Cement
0.015
1800
0.93
Brick wall
Brick
0.64
1800
0.81
Modern construction
Aerated concrete
0.3
400
0.15
Insulation Rockwool FACADE BATTS
0.13
145
0.048
Plaster
0.12
1800
0.81
Task: Calculate additional heat losses per length through the window slope for the monolayered brick wall
and for multilayered modern construction.
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