100 KVA UPS heat dissipation

[mrkhubert]

I have a 100 KVA UPS (uniterrupted power supply) unit with a maximum heat dissipation rate of 20,490 btuh. I am looking of a realistic diversity factor to use in my heat load calculations.

 

[DrRTU]

Check with the UPS provider, I found the SHG to the room will vary based upon what the unit is doing. The unit will have a "maintain" mode that places a replacement charge on the cells. During the normal maintain, the heat output will be low. Only during a restore (full charging) after a loss of the main bus will the unit do a heavy charge and this is the max output. The last few I looked into could take the room temp up to 95 F without a loss of output.

 

[Wareagl487]

As DrRtu said...

The big hit as I remember is when they are brought on line - huge btu/hr. number - but they are not on line for very long - just enough time for the generator to fire up - 5 minutes tops before they poop (I have only experience in data centers). Along with a dedicated HVAC unit, its also prudent to put in a relief hood with motorized damper controlled by a thermostat to help with that first surge of heat dissipation.

Andy W.

 

[tankanghan]

I had this exact situation and was told that the heat dissipation from UPS is basically constant....

 

[cry22]

Why use a diversity for such a small load?