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Forum discussion

CS-2009 EAp2:Minimum Energy Performance

no cooling / using addendums

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Samuel Sura
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LEEDuser Basic Member
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Hello, I have two questions: 1) we are working on residential building where its occupied spaces has heating and cooling, but rooms situated on north facade has no cooling system. Whole building floor area is 5 600 m2 (60 277 ft2) and these rooms without cooling are only 340 m2 (3 660 ft2). My question is how I should model the proposed HVAC system regarding to Table G3.1.10d where is stated: "where no cooling system exist or ......., the cooling system shall be identical to the system modeled in the baseline building design." I think this is definitely not my case, I think this can be applied where whole building has no cooling system. But can I leave these rooms without any cooling and in baseline building the cooling system will be present? 2) It is not clear to me if I have to use addendums to ASHRAE Standards or not. Or just some addendums? I am sorry for maybe dumb questions but I rather ask than stay in confusion. Thank you in advance.

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
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Tue, 07/21/2015 - 13:28

Technically you are required to model cooling the both cases in the whole building. You are however allowed to model a high temperature set point in the spaces without cooling so that they system never operates. What we do is tell the reviewer that we could model a cooling system where it does not exist and set the temperatures high enough for it not to operate but have not done so because it is a waste of time. We then just model the proposed as designed and model the corresponding areas in the baseline without any cooling, just as in the proposed.
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Samuel Sura
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Tue, 07/21/2015 - 14:00

Thank you very much Marcus for quick reply. I like your way how to deal with it. And what about my second question, because now I dont know if using Addendums is required or I should forget about all Add. and just work with "first edition" of Standard 90.1-2007 and issued Erratas. Because Addendum r completely changes Appendix G or Addendum g changes some U factors etc. So I dont know... Thanks
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
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Tue, 07/21/2015 - 14:30

You are not required to use any of the addenda. You should only use an addenda if you need to do so. Some of them are very helpful depending upon the issues in your models. Keep in mind that if you use an addendum you must use it in its entirety.
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Samuel Sura
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Tue, 07/21/2015 - 14:47

OK, now I understand. Thank you Marcus!

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