Examples
Examples
Try the starting example
- Surface areas (m²)
- 20,10,8
- Surface U-values (W/m² K)
- 0.3,1.5,0.8
- Indoor minus outdoor temperature (K)
- 20
- Internal heat gains (W)
- 500
- Conductive heat loss (W)
- 548
- Net heating duty (W)
- 48
Try another scenario
- Surface areas (m²)
- [21, 10, 8]
- Surface U-values (W/m² K)
- [0.3, 1.5, 0.8]
- Indoor minus outdoor temperature (K)
- 20
- Internal heat gains (W)
- 500
- Conductive heat loss (W)
- 554
- Net heating duty (W)
- 54
Calculation method
Calculation method
Conductive heat loss (W)
Σ(U×area)×temperature difference minus entered gains; excludes ventilation and thermal storage.
Net heating duty (W)
Σ(U×area)×temperature difference minus entered gains; excludes ventilation and thermal storage.
Symbols and units
- a
- Surface areas (m²)
- b
- Surface U-values (W/m² K)
- c
- Indoor minus outdoor temperature (K)
- d
- Internal heat gains (W)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- User-supplied measurements and assumptions; Σ(U×area)×temperature difference minus entered gains; excludes ventilation and thermal storage. Supported limits: Finite numeric values bounded to 1e9 magnitude; lists and tables contain 1–100 records unless a stricter bound is stated. Inputs use the units shown. Lists explicitly paired by a method must have matching lengths; independent polynomial coefficient vectors may differ. Respect stated physical, interpolation, policy and computational domain limits.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.