MihsabaHow to use
The steady 1D flat-layer conduction model uses the simplified Fourier relation to estimate heat rate from k, area, ΔT and thickness.
- Enter k and area.
- Enter temperature difference and thickness.
- Optionally enter hours.
- Review watts and energy.
How it is calculated
Q̇=kAΔT/L; Q=Q̇t
Example
Example: k=0.8 W/m·K, A=10 m², ΔT=20 K and thickness 0.2 m gives an ideal 800 W.
Important notes
The model assumes steady state, a homogeneous layer and ideal contact; convection, radiation and thermal bridges are excluded.
Frequently asked questions
What if thickness increases?
Heat rate decreases inversely.
Is k always constant?
No.
Is this a multilayer U-value?
No, one layer only.