The heat loss from an electric motor supplied with 10 kW can with the heat loss 150 watts/kW from the table above be calculated as
(10 kW) (150 watts/kW)
= 1500 watts
= 1.5 kW
The rest of the energy
(10 kW) - (1.5kW)
= 8.5 kW
is output mechanical energy.
If the motor and the mechanical equipment connected to the motor is in the same room - or enclosure - all electric energy supplied to the motor will convert to heat and temperature increase in the room.
The heat transferred to a room or enclosure depends on the location of the motor and the driven device related to the room.
Nameplate Rating (hp) | Motor Efficiency (%) | Heat Loss to Room Air (Btu/hr per rated hp) | ||
---|---|---|---|---|
Motor in Room Driven Device inside Room | Motor in Room Driven Devise Outside Room | Motor Outside Room Driven Device inside Room | ||
0 - 1.5 | 0.80 | 2542 | 508 | 2034 |
1.5 - 12.5 | 0.85 | 2542 | 381 | 2161 |
12.5 - | 0.90 | 2542 | 254 | 2289 |
Electrical units, amps and electrical wiring, wire gauge and AWG, electrical formulas and motors.
Calculate electric motor efficiency.
The motor must be capable of accelerating the fan wheel to it's operating speed.
Amount of heat transferred from electrical motor to ambient room vs. locations of fan and motor.
Heat loss from electrical equipment like switch-gear, transformers and variable frequency drives.
Full load amps, wire and conduit sizes for three phase electrical motors.
Inductive loads and power factors with electrical three-phase motors.
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