[Equest-users] peak heating demand

Alex Krickx akrickx at seriousmaterials.com
Wed May 18 12:02:48 PDT 2011


Hi Deepika,

I'm not sure how eQUEST calculates loads, but I can imagine a scenario where your results make sense:

Peak heating load probably happens at night/early in the morning, right? So it probably depends on insulation (R-value) and not solar gains (SHGC). My guess is the window with the higher peak demand has low R-value (since you need lots of heat to make up for losses). But this window could have a high SHGC, so when the sun is out you benefit from passive heating (and have lower annual heating demands).

I'm guessing your other window (with lower peak heating) has a better R-value - it retained heat better. This window may have a lower SHGC (possibly due to additional low-e coatings) and so it get less passive heating throughout the year and needs more heat to be added to the building during daytime hours.

This will depend on the windows you've modeled, building type and climate. Perhaps if you share some more info on the project the answer will present itself.

Regards,
Alex Krickx

Alex Krickx, LEED AP
Building Energy Specialist
[cid:image001.jpg at 01CC1553.64B69D20]
1250 Elko Dr, Sunnyvale, CA 94089
(t) 408.541.8124

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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of deepika khowal
Sent: Wednesday, May 18, 2011 11:19 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] peak heating demand

Hi all
I am modeling the performance of different glazing types in a building.
I realized for one glazing, the peak gas demand is lower than other glazing but total heating energy is higher?
how does equest calculate these loads and energy?
Thanks

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