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Forum discussion

CS-2009 EAp2:Minimum Energy Performance

proposed model fan power

We have received our Design Final Review comments and the LEED reviewer has denied EAp2 because the proposed equipment capacities do not match the equipment schedules on the HVAC drawings. Our review comment indicates that the proposed fan power values should match the nominal horsepower for these motors per the mechanical schedules. I feel that this is incorrect. The proposed model should be based on the brake horsepower values, not the nominal motor horsepower values. Please let me know if I am incorrect about this. Also, is there a CIR or other documentation that I can mention in our appeal.

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

Thu, 06/11/2015 - 16:43

It should be BHP. The Proposed model should match the mechanical schedule and if it does not then an explanation should be provided. If the schedule includes just HP and the models indicates something else, like kW, the reviewer should make an assumed adjustment to HP to estimate BHP before converting to kW. We usually use about 85% then 0.746kW/HP. So if you do not provide the BHP. No interpretation or other documentation should be needed for a HP-BHP-kW calculation. You could send a project team inquiry to GBCI about the review comment if you think the reviewer was in error.
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Maria Spastri
Sustainability Consultant
AECOM
LEEDuser Basic Member
0 thumbs up

Wed, 05/03/2017 - 19:17

Hi Markus, For clarification purposes. You are saying that for the conversion of fan/pump bhp to KW we should use: Fan KW = (bhp x 0.7457 KW) / motor efficiency (ex. 85% or 65% etc). Please confirm. Thanks, Maria
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Wed, 05/03/2017 - 19:42

That gets you close.

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