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NC-2009 EAp2:Minimum Energy Performance

Fan power in conditioned space

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Panupant Phapant
SCG Cement - Building Materials
LEEDuser Basic Member
13 thumbs up

Hello, My production line space in our project have an supply fan, exhaust fan and make-up fan to supply OA in conditioned space. All of the fans is operate continuously during occupied periods. Normally, baseline fan power should be modeled using a portion of the system fan power allowance. Where can I put make-up fan power in Table 1.4.7A because the form have only supply, return/relief and exhaust ? Can I grouping between make-up and exhaust fan ? Now my simulation model use only the ratio between supply and exhaust fan. For OA I put the flow but make-up fan power was added to meter side identically in baseline and proposed case. I used eQUEST for simulated this project.May be it was not correct method.

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Fri, 09/23/2016 - 18:28

Normally the supply fan bring in the OA. So I would proportion the fan power in the baseline the same as the Proposed fans except that I would add together the make-up air fan and the supply fan. The exhaust fan power would be what is left over. Report it as modeled in Table 1.4.7A. The make-up fan sounds like a part of the system so it should not be modeled identically. Let me run through an example. Suppose you had a 2 kW supply air fan, a 1 kW make-up air fan and a 1 kW exhaust fan. Add the SA and MUA fans. So now you have a 3:1 ratio of fan power. Do your baseline fan calculations and then proportion the baseline fan power between supply and exhaust with a 3:1 ratio as well. You should not model the make-up air fan in the baseline at all, just supply and exhaust.

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