LEED Prerequisite EA 2 Ashrae 90.1 2004

[Misvit]

Under LEED prereq EA 2 Minimum energy performance, a building must meet among other sections, 5.4 of ASHRAE 90.1 2004.

In ASHRAE 90.1 2004, section 5.5.4.2.1 the fenestration area is required to be at a maximum of 50% of your gross vertical surface.

We at the firm are wondering if any provisions have been made in LEED for such surfaces that have been totally shaded using devices, overhangs, solar panels, etc. Our building is basically a glass box with a very large roof overhang and we have done rudimentary sun shading experiments to find that for instance, the south facade receives no direct solar daylight during any part of the year during business hours. Furthermore we have had mechanical get us a number $$ in savings for a similar building with 50% spandrel instead of what we have shown, which was $400 per year on the 100,000 sf office building.

Once again my boss questions the intent of this point and would like to argue that the minimum difference in cooling load and savings would denote that our overhang has met the requirements put forth in this prerequisite.

Sorry for asking what seems to be so cut and dry, but I don't know what else to do and once again, LEED refuses to answer when I call them until they see $$.

[joelmckellar]

Don't forget that you may comply with the second half of the requirements by running a performance calculation without complying with the prescriptive requirements. From the Credit:

"the prescriptive requirements (sections 5.5,6.5,7.5, and 9.5) or performance requirements (Section 11) of ASHRAE/IESNA Standard 90.1-2004 (without amendments)"

Basically what this means is that if you are running a performance calculation, LEED and ASHRAE allow you to throw out the prescriptive requirments set forth in those sections. You will still need to comply with the mandatory provisions (5.4, 6.4, 7.4, 8.4, 9.4, 10.4), but the section you mentioned (5.5.4.2.1) is not in this requirement.

I say run the numbers (which you're likely doing for EAc1 anyway) and you should be fine.

[gleearch]

I agree with Joel. You have the option to run the computer simulation for EA credit 1. If your building complies, the pre req does mention that you can use the simulation. I just went over this with my mechanical engineer yesterday on an 40k sf office building.

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[svenglezz-ASMEIL]

Keep in mind on an apartment/condo you do not get the flexibility as say a commercial building with having a central HVAC system that can reclaim energy (HRV etc.) So the other method is not possible on an apartment/condo.

My personal experience is that an apartment or condo building will not pass the program if it is over 50% glass. And if you go over this 50% you will need first HEAVY tint in the glass and have triple or quad pane glass to pass the program.

Also the location of the glass is a big factor to (North, South, East, West).

Shading will have a factor but nothing like the ratio of glass to wall.

It's amazing to see how many building being built will not pass this program/code (even with shading devices etc.). Guess that's why it's becoming more of a standard in Europe to build with triple pane glass.

Kind regards,
Sven