#### Rates of Heat Transfer

Now we are ready to calculate the rate of heat transfer by substitution of known values into the above equation. Rate = ( W/m/°C)•( m 2)•(21°C 4°C)/( m) Rate = 2400 W (rounded from 2352 W) It is useful to note that the thermal conductivity value of a house window is much lower than the thermal conductivity value of glass ...