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Calculates how large the power demand for the ventilation system is.


Input Result
Power P=
Flow q=
Density ρ=
Specific heat capacity cp= kJ/(kg,˚C) kJ/(kg,˚C)
Inlet temperature Ti=
Extract air temperature Tu=



Refers to the effect that needs to be air to raise the temperature of the air to the desired value.


The current flow in the duct


Density or volume of the mass is an SI unit and is a measure of a specific substance density, ie mass per unit volume. A synonym for density that can sometimes occur is specific gravity.

Specific heat capacity

Specific heat capacity cp and is a measure of a material's ability to store thermal energy. SI unit for the specific heat capacity is J/(kg*K).

Inlet temperature

The temperature of the air blown into the room.

Extraction temperature

The temperature of the air leaving the room via the air.


Power: Power