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  1. mildlyHVAC

    Heat gain from Fans

    ... but it says DL is drive loss for a belt drive. So they are accounting for belt drive loss through DL AND ED? This makes no sense.
  2. mildlyHVAC

    Heat gain from Fans

    Hi all, In Chapter 18 of ASHRAE Fundamentals 2021, we see this in the "Heat Gain From Fans" section (page 18.47): "The power necessary at the input to the fan motor must account for fan motor inefficiencies and drive losses. Fan motor efficiencies generally vary from 80 to 95%, and drive losses...

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