[Equest-users] Integrated Window Blinds in Dual Pane Windows

[Bishop, Bill]

Peter,

Are you doing an Appendix G model? If so, I thought I'd remind you that, per Table G3.1, "manual fenestration shading devices such as blinds or shades shall not be modeled." If the integrated blinds are automatically controlled then they can be modeled.

I'm curious about the U-value changing (presumably improving - decreasing). Why would blinds change the U-value?

Regards,
Bill

[Senior Energy Engineer 28Jun2012]<mailto:wbishop at pathfinder-ea.com>

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Peter Baumstark
Sent: Saturday, December 22, 2012 8:52 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Integrated Window Blinds in Dual Pane Windows

Ok. . .  I have a situation where I'm modeling a facility relative to ASHRAE 90.1 baseline.  The customer is using dual pane, low-e windows, with integrated venetian blinds between the two panes of glass.  One pane is low-e and the other is clear.  Air gap between the two (not Argon or anything like that).

I use the LBNL Windows tool, with blinds set at 45 deg, and the blinds increase the window assembly U value and SHGC significantly.

So for performance relative to 90.1, would it be acceptable to simply utilize the U & SHGC from with Windows tool?  Are there any restrictions on the angle of the blinds, or whether the angle should be different for winter vs summer?

I'd appreciate any guidance on how to best model this scenario.

Thank you,
Pete Baumstark
San Jose, CA
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20121226/8fba79af/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 20869 bytes
Desc: image001.jpg
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20121226/8fba79af/attachment-0002.jpg>