Motor Heat Load Dissipation
Motor Heat Load Dissipation
(OP)
Looking for a formula to calculate motor heat load dissipation. I have a 100hp TEFC motor (460V 3ph) on our shop floor running continuously under normal load. In sizing a ventalaion system for this area, I'm trying to account for the heat generated by the motor.





RE: Motor Heat Load Dissipation
If the load is located outside the ventilated space than subtruct the shaft power (actual or 100HP, from load Q.
If the motor's cooling is modified to external blower with piping routed outdoors, this is further reduced to neer zero.
Note: do not forget to convert units (HP<->KW<->BTU/Hr)
RE: Motor Heat Load Dissipation
So 11 hp or about 8.2 kW is lost, by various means, as heat. This does not include losses in whatever the motor is turning, which will usually be less efficient than the motor.
A new premium efficiency motor could have a much higher efficiency, perhaps up to around 93%, depending on speed, enclosure, etc.
RE: Motor Heat Load Dissipation