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Construction

Building thermal calculations

Thermal resistance, transmittance and heat loss.

Layer thermal resistance

R = δ / λ→Construction

Two-layer thermal resistance

R = δ₁/λ₁ + δ₂/λ₂→Construction

Thermal transmittance U-value

U = 1 / R→Construction

Heat loss through envelope

Q = UAΔT→Construction

Heat flux density

q = ΔT / R→Construction

Heat loss from resistance

Q = AΔT / R→