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Continuous electric heating of air or other gas.

Scheme of a continuous electric heating of gas

It calculates the thermic energy and electric energy necessary to heat a gas with continuous flow rate. It gives also the values needed to the dimensioning of the electric power supply circuit.

Commonly used for heating of air in various plants drying or drying, conditioning, treatment of shrinkable films etc. ...
The most common example for gas heater is the hairdryer present in every house.

Data input
Gas characteristics

Kind of the gas

Density of the gas

Wait gas parameters


Specific heat of the gas


System requirements

Temperature of the inlet gas


Temperature of the output gas required


Gas flow rate


Electrical data (optional)

Mono-phase line or dc current

Tri-phase line, star configuration

Tri-phase line, delta configuration

Supply voltage


Wait calculate

Required energy kW
Thermic power equivalent kcal
Current required in steady-state A
Supply voltage on each resistor V
Electric resistance in steady-state (each resistor) ohm

The output gas will have a flow rate slightly higher than at the inlet, here the coefficient of expansion is not considered.

With the increasing of humidity content will increase the required energy so with the same installed power decreases the outlet temperature.

Electric heaters have a positive coefficient of electric resistance, the cold start needs higher current, so the thermal energy given at the beginning is higher and stabilize after a certain time depending by the mass to be heat.

The container mass of the heater is ignored, at the steady-state, if insulated, is pratically insignificant.

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