[Equest-users] Existing Building - New Windows

[Ross Farris]

Hi Amy,

For the windows, your baseline model should incorporate the existing conditions per table G3.1 of ASHRAE Std. 90.1.

The metal panels are just being added to the exterior of the existing skin? They are not likely to do anything to the existing wall U-value. You could do a hand calculation to determine the overall U-value with the addition of the panel, but I imagine it will be negligible. However, it would affect the absorptance/reflectivity. Depending on what percentage of the wall is being covered, you could look into creating two wall assemblies: one with the existing skin, and one with the metal panels on the outside (there is a material for "steel siding") and model two different Ext. Colors (absorpt.). Table 3 in the help file has Solar Absorptance of various exterior surfaces. This is a lot of work for probably very little variation in model results.

I am curious, if you are considering going LEED for this project, given the amount of design, does it fall under the NC (Major renovation) category? If it is under commercial interiors, I would imagine you will see more LEED points for EAc1.3 through option 1 than you will by building an energy model for LEED.

Regards,

Ross Farris, CEA
Energy Analyst
Regional Energy Director

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From: Harmon, Amy [mailto:aharmon at sbmce.com]
Sent: Wednesday, February 06, 2013 12:50 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Existing Building - New Windows

I've been scouring the archives for answers, but did not find my exact scenario.

I have a 10 story dormitory that was built in the early 60's.  We're looking to submit the building to LEED.  We're removing the existing 2 pipe FCU system serving the perimeter rooms as well as an AHU that conditions the core spaces for the whole building, with a 4 pipe FCU system along the perimeter rooms (natural windows via operable windows) and an AHU for the core spaces in the building.

A couple questions, the architect is replacing all the windows in the building.  Since the proposed case windows will be what we're designing to, what windows do I use for my baseline...existing as it stands today or the ASHRAE minimum found in Table 5.5?

The architect is also adding metal panels to portions of the building to dress it up, how do you go about adding the metal panels (UNINSULATED) to the existing wall used in the baseline?

Thanks for helping!


Amy Harmon
Mechanical Engineer
Scheeser Buckley Mayfield LLC
1540 Corporate Woods Parkway
Uniontown, OH 44685
Office: (330) 896-4664 x107
Direct: (330) 526-2707
Fax: (330) 896-9180
aharmon at sbmce.com<mailto:aharmon at sbmce.com>
www.sbmce.com<http://www.sbmce.com/>

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