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.
Kind of the gas
Density of the gas
Specific heat of the gas
Temperature of the inlet gas
Temperature of the output gas required
Gas flow rate
Mono-phase line or dc current
Tri-phase line, star configuration
Tri-phase line, delta configuration
|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.