Fan Heat Question
Fan Heat Question
(OP)
How does one calculate fan heat added to a system when:
1. Only the fan is in the air stream.
2. Fan and motor are in the air stream.
Thanks!
Bill
1. Only the fan is in the air stream.
2. Fan and motor are in the air stream.
Thanks!
Bill





RE: Fan Heat Question
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RE: Fan Heat Question
If the fan motor is in the airstream then all motor losses would be added as well (heat transferred from the motor to the air).
If the fan motor is out of the airstream then only the energy imparted to the airstream by the fan blade would heat the air.
EG: 30kW motor and 90% efficiency = 33.3kW electrical energy.
If the motor is in the airstream, 33.3 kW of heat is added
If the motor is out of the airstream, 30.0 kW is added to the airstream.