Heat load of motors
Heat load of motors
(OP)
I, once again, want to bring up the issue of heat load of motors to your kind notice. I have been observing the designers using the following equations for heat load of motors, that confused me since I started learning about HVAC.
Motor and driven machine inside control space - HPx2545/eff.
Motor out driven machine in - HPx2545
Motor in driven machine out - HPx2545x(1-eff)/eff
Now coming to my question, if I have a chiller placed inside a controlled space (may not be within the same space which is conditioned by this particular chiller), what will be the heat load due to this chiller to the controlled space?
I am sincerely awaiting some discussion on this topic.
Motor and driven machine inside control space - HPx2545/eff.
Motor out driven machine in - HPx2545
Motor in driven machine out - HPx2545x(1-eff)/eff
Now coming to my question, if I have a chiller placed inside a controlled space (may not be within the same space which is conditioned by this particular chiller), what will be the heat load due to this chiller to the controlled space?
I am sincerely awaiting some discussion on this topic.





RE: Heat load of motors
Refrigerant cooled, heat rejected to the condenser water loop and rejected outside, heat gain to space is minimum.
So this should be a call to the manufacturer in this case.
RE: Heat load of motors
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RE: Heat load of motors
imok2,
I have been to the engineeringtoolbox site plenty of times but somehow overlooked this particular topic. Though the formulae are same more or less, the footnotes are quite useful and reiterate my ideas.
walkes,
You commented as if you read my mind. My next question would have been about the cooling tower capacity in this situation, if I didn't get replies in the same note.
The calculation for heat load due to equipment, thus, should be calculated, not by standard set of formulae but, on case to case basis, in terms of energy contained in a particular situation. I feel this thread will be a reference for similar threads that were asked in the past and/or that will be asked in future.
Thanks for your replies.
RE: Heat load of motors
What we don't address and I've seen this become a problem is the heat put out by the 500 H.P. motor connected to this drive. I've seen several chiller mechanical rooms where there in no cooling in the room, and even with all the heat rejection the drive has we still expeirence overheating issues.
I'm not a real engineer, but I play one on T.V.
A.J. Gest, York Int./JCI
http://home.comcast.net/~offsetaj/
RE: Heat load of motors