[Equest-users] HVAC sizing - triple vs. dual

Alex Krickx akrickx at seriousmaterials.com
Tue Aug 24 10:30:32 PDT 2010


Hi Namrata,

As I see it, there are 2 ways that glass affects energy: solar gains coming in (which is tied to the SHGC) and heat transfer through the unit (tied to the U-factor). If you substantially reduce the SHGC going from double to triple pane, then you may be losing some passive heating, thus increasing your boiler sizing (although I would expect it would have to be a substantial change in SHGC to outweigh the benefits of improved U-factor). As for U-factor: in a building with high-internal loads you may benefit in summer from excess heat being released through the glazing (as Vikram pointed out) - so this would increase your peak chiller capacity. That would not entirely surprise me, but I think an increase in boiler size is less typical.

My 2¢.

Cheers,
Alex Krickx


Alex Krickx
Building Energy Specialist
[cid:image002.jpg at 01CB4377.618BEB40]
1250 Elko Dr, Sunnyvale, CA 94089
(t) 408.541.8124

Warning: The information contained in this e-mail may be privileged attorney-client communications or attorney work product and/or proprietary and confidential.  If the reader of this message is not the intended recipient then you have received it in error and any review, distribution or copying of this message is prohibited and you are to notify us immediately by reply e-mail and delete the original message immediately.



From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Namrata Vora
Sent: Monday, August 23, 2010 6:12 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] HVAC sizing - triple vs. dual

eQuest is showing for identical bldgs HVAC sizing for triple pane to be more than that for dual pane for cold climates like Edmonton. Is that normal?


Namrata
Work: 408-263-9225
Cell: 408-893-3729
[cid:image001.jpg at 01CB4376.CE9F4F20]

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20100824/e25b088d/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 2353 bytes
Desc: image001.jpg
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20100824/e25b088d/attachment-0002.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.jpg
Type: image/jpeg
Size: 5602 bytes
Desc: image002.jpg
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20100824/e25b088d/attachment-0003.jpg>


More information about the Equest-users mailing list