Attention should be paid to power issues when using single headed tubes
The temperature calculation for single headed pipes is based on heating from 0 degrees.
Assuming the exhaust speed of the fan is 5 meters per second and the exhaust area is 0.5 square meters, the displacement per minute is 5 x 0.5 x 60=150 cubic meters. If the mass is ≈ 150Kg, then the heat carried away by the fan per minute is: 150 × 150 × 0.24 ≈ 5400KJ (kilojoules); Of course, if your fan does not exhaust all the hot air outside the furnace, but circulates inside the furnace, then there is not as much heat carried away.
Assuming that the iron parts heated per minute are 100Kg (this quantity refers to the amount of input and output), the heat carried away by the parts is: 100 x 0.46 x 150 ≈ 6900KJ (kilojoules); If the components can be cooled in the cooling zone of the furnace and the cold air entering the furnace can be preheated, then the heat carried away by the components will not be as much.
So, the total heat required for heating is: 3600+5400+6900 ≈ 15900KJ/minute; The heat dissipation of the furnace wall is much smaller than that of the fan and can be ignored.
The final required electrical power of a single headed tube is 15900 ÷ 57 ≈ 279KW (kW);
The above calculations were hastily assumed by the editor and may not be correct, but the principles are for reference.