Input Parameters
Formula Reference
Based on the cylindrical heat conduction equation:
q = (π × ΔT) / ( ln(D₀/D) / (2λ) + 1/(α D₀) )
- q = heat loss per unit length (W/m)
- ΔT = fluid temperature − ambient temperature
- D = pipe outside diameter (m), D₀ = insulated outside diameter
- λ = insulation thermal conductivity
- α = surface heat transfer coefficient
How this pipe insulation calculator works
This calculator solves the cylindrical heat conduction equation to find the minimum insulation thickness that keeps heat loss below the allowable W/m target.
Inputs explained
- Pipe outside diameter defines the base cylinder diameter.
- Fluid and ambient temperatures define the temperature difference.
- Allowable heat loss is the target maximum heat loss per meter of pipe.
- Insulation conductivity represents the selected insulation material.
- Surface heat transfer coefficient represents surrounding air conditions.
FAQ
Why does thermal conductivity matter?
Lower conductivity insulation resists heat flow better and usually needs less thickness for the same heat loss target.
What does surface temperature mean?
It is the estimated outside surface temperature of the insulation after the thickness is applied.
Can this calculate condensation risk?
No. This version targets heat loss. Condensation control needs humidity, dew point, surface temperature, and vapor barrier checks.