Hotel service load- adding heat pumps?

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Sierrasparky

Sierrasparky

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Location
USA
Occupation
Electrician ,contractor
I have a project that is looking to add many Heat pump units to an existing Hotel. The current heating is gas and will be removed for the heat pumps so they can have A/C.

What my concern is how to calculate the Service entrance when making this addition. Do we calculate using the total sum of all the Heat pumps and apply no diversity or other reduction as I doubt that all units will be used at the same time many of course will.
 
Calculate using the total sum of all the Heat pumps and apply no diversity. Have to consider there may be an occasion where all units will be used... however rare or likely that will be. Very hard to prove diversity, but your only option to apply any diversity is to talk to the AHJ about it.
 
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And if there is back-up electric resistance heating, that load is sometimes larger than the heat pump compressor load so make sure you use the larger load in your calculations.
 
Thanks,
I was thinking the same.
As far as back-up resistance heating are you referring to heat strips or actually another heater?
 
Sierrasparky said:
Thanks,
I was thinking the same.
As far as back-up resistance heating are you referring to heat strips or actually another heater?
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In houses or other buildings they often use a duct heater in the system to supply heat when the heat pump can't. I would expect that the hotel unit would be a self-contained unit, and it would likely have some type of electric heater in it. That is if back-up heat is required.
 
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