To heat a volume V of a solid, a liquid or a gas in a given time T
(without state modification).
Volume
V =
 Liters ou dm3
Volumic mass
r=
 kg/dm3
Mass to be heated
V.r=
 kg
Initial temperature
t1 =
 °C
Final temperature
t2 =
 °C
Specific Heat
Cp =
 kcal/kg.°C
Heating time
T =
 hours
Required Power
P =
 kW
To vaporize a mass M in a given time T
To heat a volume V in a given time T
To calculate the power of an air conditionning unit
Determination of the required Power