Cuboid dimensions (m):
a:
b:
c:
Indoor temperature, t1 (°C):
Outdoor temperature, t2 (°C):
Thermal conductivity, k:
Extruded polystyrene foam - 0.03
Mineral wool - 0.035
Custom
Thickness, l (m):
Formula:
2*(a*b + b*c + a*c) * (t1 - t2) * k / l