- Area
- Temperature difference
- Thermal resistance
- Conductive heat loss equation: Q=AxΔT/RSI (from CHBA 2.1.3)
- Q is rate of heat flow in Watts (W)
- A is Area of surface in m2
- Δ T is Temperature Differential between inside and outside in °C
- RSI is resistance to heat flow in m2 °C/W
Heat transfer by conduction Calculation
Example: A wall section is 5m2 and has an RSI of 3.3528 (R20) an indoor temperature of 20°C (68°F) and an outdoor temperature of -10°C ( 14°F)
Q=A x ΔT/RSI
Q= 5 x 30/3.35
Q=150/3.35
Q= 44.78 W