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NC-2009 EAp2:Minimum Energy Performance

Baseline HVAC Systems

Profile picture for user msommerman_1
Khaled Fouda
Design Engineer, LEED AP (BD+C)
Energy Concepts
LEEDuser Basic Member
5 thumbs up

I am Energy Modeling a highrise new construction in NYC. The building total area is 150,000 SF but the nonresidential areas combined are more than 20,000 SF therefore the building complies with G.1.1 exception (a). I used System 1 for the residential portion of the building 90,000 SF Question: I am not sure if the nonresidential areas (28,000 SF combined) should be considered for system 7 since the building is over 5 floors or I deal with them individually where none of them is more than 25,000 SF or more than 3 floors so all will use system 3. Thanks for help in advance.

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Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
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Tue, 01/26/2016 - 22:56

I'm confused by your numbers. When you subtract the residential you should have 60,000 sf. This would be a system 5.
Profile picture for user msommerman_1
Khaled Fouda
Design Engineer, LEED AP (BD+C)
Energy Concepts
LEEDuser Basic Member
5 thumbs up

Wed, 01/27/2016 - 13:56

Thank you for your response Marcus. Actually out of the 60,000 sf there's (16,000 sf Parking Garage, 12,000 Retail, 17,000 Church and the rest is common areas as corridors and stairs) From your replied above I got that I should model the Residential 90,000 as system 1 and everything is as system 5. Correct me please if I am mistaken
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Wed, 01/27/2016 - 15:29

In a residential high rise I would always include the corridors and stairs in the residential portion as that is the function they serve. If the parking garage is unconditioned it is excluded so now we have 29,000 sf. This is still a system 5. You then could apply G3.1.1 Exception b based on schedule differences and end up with a system #3 in the retail (the church area is greater and therefore predominant). At this point you probably have a choice. You could claim that you are now left with 17,000 sf and model a system 3 for the church as well or model the church as a system #5 and the retail as #3. Either way would probably be OK.

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