Thermal Bridge Calculator
Calculate the linear thermal transmittance (ψ-value) and extra heat loss from thermal bridges in building envelopes.
How to Use the Thermal Bridge Calculator
- Enter the length of the thermal bridge in metres.
- Enter the U-value of the bridge element (W/m²K).
- Enter the U-value of the surrounding wall (W/m²K).
- Click Calculate to obtain the ψ-value and severity.
Anwendungsfälle
- •Assessing thermal performance of building junctions.
- •Identifying significant heat loss pathways in walls.
- •Compliance with energy efficiency standards.
- •Optimising insulation detailing at structural elements.
Formel
ψ = L × (U_bridge − U_wall). Extra heat loss = ψ × ΔT.
Häufig gestellte Fragen
What is a thermal bridge?
A thermal bridge is a path of higher thermal conductivity through the building envelope, causing extra heat loss and potential condensation.
What is the ψ-value?
The ψ-value (psi) is the linear thermal transmittance in W/(m·K), quantifying heat loss per metre length of the bridge per degree temperature difference.
Is it free?
Yes, all calculators on OhMyCalc are completely free.