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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

Big Ceiling Fan

Laura Long

Sr. Designer, Sustainability and Sr. Associate

NORR

LEEDuser Premium Member

22 thumbs up

August 2, 2013

I have a job where there are several Big Ass Fans. My problem is in determining how to model them in the energy simulation. First, since HAP is being used, and there isn't anything to help lower the heating and cooling requirements, I'm pretty sure that it is just ignored. Please tell me if I'm reading ASHRAE 90.1 correctly on this one. Second, I'm pretty sure that modeling it as a separate entity with it's own schedule and power is required, but am not sure if it should be a process load or not. I'm fairly certain it's not a process load, but am looking for some help to make sure that I'm looking at this correctly. Thank you,

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Sun, 08/04/2013 - 22:56

I think it is a process load. Since it does not affect ambient temperatures in the space like a heating or cooling system, it is basically a motor load producing heat in the space. In general ceiling fans do not impact space temperatures but do affect thermal comfort by increasing the cooling effect through air movement. How it will be operated would dictate whether it needs a separate schedule or can be placed on another, already existing schedule. You do need to model it just like every other load which affects energy use.

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