[Equest-users] Window Comparison

[Alex Krickx]

Hi Brett,

As I was going through a research document, I found another answer to your question.

http://gaia.lbl.gov/btech/papers/59190.pdf

Figure 5 on page 12 shows how different performing windows impact energy use. Although this graph is for residential buildings, it shows that improving U-factor only saves energy when reducing SHGC. I would guess that for commercial buildings (typically higher internal loads than residential) this effect will be even greater. Once the model is working, try looking into a low-SHGC solution.

Hope this helps.

Cheers,
Alex

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Brett M. West
Sent: Monday, November 08, 2010 1:38 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Window Comparison

I am doing a model for a two story office building with the windows making up approximately 30% of the building's exterior. My goal is to find what type of energy savings the owner can expect by replacing all the existing single pane windows with double pane, low e windows. When I change the window type to a double pane low-e window I am seeing savings that are very small, around 3% of the total building kWh.

For reference, the buildings HVAC system consists of two air handlers (one per floor) ducted to a VAV system with hot water reheat.

Has anyone else tried to do this type of comparison and if so what type of energy savings did you find? I have attached my model pd2 and inp files for reference. Thanks in advance for any information.


Brett West

RMF Engineering, Inc
Ph: 843.971.9639
bwest at rmf.com

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