Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
The Fan:ConstantVolume and Fan:VariableVolume objects both have a field for motor efficiency separate from the fan efficiency (circled in red below). The difference between the two efficiencies is that the motor losses can be specified as out of the airstream and therefore not add any heat to the supply flow. So any losses that you don't want to contribute to a temperature rise (e.g. drive losses outside the AHU) will have to be included in the motor efficiency.
