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NC-2009 EAp2:Minimum Energy Performance

building area method

Two issues regarding the building area method. 1. Can the reduction of the lighting power due to occupancy sensors (according to Table G3.2) be considered only if for the baseline model I use the Space-by-Space method, i.e. can it not be used with the Building Area Method? It seems that the reviewers of a model of mine consider Table G3.2 in this way but I am not sure I have understood the rule properly. 2. If I use the Building Area Method method, can I apply the general lighting power density to all the spaces (including underground parking garage)? (somewhere I read I cannot, but I'm no more able to find it. Is that rule only for ASHRAE 90.1-2010?). I'm using v. ASHRAE 90.1-2007.

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

Tue, 05/31/2016 - 13:41

1. It can be used with the Building Area method in those spaces where such controls are installed in the Proposed case. 2. You should apply the building area method to the specific building type related to the separate and distinct spaces in a building. If there is a parking garage use the garage LPD for that part of the building. The question is how far should you take this guidance? In my mind if the area in question is significantly greater than the norm for that building type you should use a separate building type for it. Another rule to guide this question would be what produces the most conservative result. In your case a parking garage is not necessarily the norm for an office building and modeling it all as an office would not produce a conservative result. A warehouse project is also a good example. Use office for the office portion and warehouse for the warehouse portion. I would not take this down to the room level or small spaces as then you should be starting to apply the space-by-space method.

Tue, 05/31/2016 - 16:05

Thank you, Marcus. I guess that if you use the space-by-space method you can avoid comments from the reviewers. Regards
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 05/31/2016 - 17:01

The space-by-space method also tends to produce greater energy savings in our experience.

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