[Equest-users] Thermal mass effects

[Keith Swartz]

Peter,

There are two ways to model walls (and roofs) in eQUEST. To capture thermal mass effects you have to use the layer-by-layer input. Using resistance only will not account for thermal mass.

Keith Swartz, PE
Senior Energy Engineer | Seventhwave | Madison.Chicago.Minneapolis
(formerly Energy Center of Wisconsin)
608.210.7123 | www.seventhwave.org<http://www.seventhwave.org/>

From: bfountain at greensim.com [mailto:bfountain at greensim.com]
Sent: Wednesday, June 03, 2015 1:37 PM
To: 'Peter Schonherr'; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Thermal mass effects

External shades can be modelled as “Fixed Shades” in the detailed mode.

Solar gains are indeed modelled.  Have a look at the summary view for a wall construction to see the impact of changing thermal mass: [cid:image001.jpg at 01D09E16.BC962510]

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Peter Schonherr
Sent: June-03-15 10:30 AM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Thermal mass effects

Hello,

      I am new to eQuest. I am trying to model the effects of thermal mass in the external walls on space conditioning efficiency. Does eQuest take into account solar gain on the building walls? Why I ask is that I've noticed that increasing thermal mass in the walls, (while maintaining the same R-value), has no effect on the heating load and very little on the heating demand. I also noticed that there doesn't seem to be a way to specify external shading from trees, adjacent buildings, etc.

Peter

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