[Equest-users] No Roof Conduction Losses

[Kendra Tupper]

If you have a plenum above your conditioned space, the roof losses appear in
the load report for the plenum. In the load report for the space, you see
this loss through the ceiling, or internal partitions.

However, I have had many issues with the roof/attic simulation in eQUEST and
often find that it seems to under predict the impacts of roof/attic
insulation and reflective roof coatings. Even removing the plenum and having
the roof in direct contact with the conditioned zone still seems to under
predict the impacts you expect from hand calculations.


On 11/17/08 4:39 PM, "Jae Koh" <jae.koh at hotmail.com> wrote:

>  
> As I can't check your project file but you may find the changes of the roof
> conduction by LS-E (Components) instead of LS-C(peaks of conditioned space).
> Also, if you remove the plenum at the top, the roof conduction should be
> affected to the conditioned spaces directly.
> And I recommend the EEM Wizard to quickly describe the alternative cases to
> your baseline model.
> 
> Good luck!
>  
> Jaeyoon Koh
> 
> 
> 
>  EMAILING FOR THE GREATER GOOD
> Join me <http://im.live.com/Messenger/IM/Home/?source=EML_WLHM_GreaterGood>
> 
>> > From: equest-users-request at lists.onebuilding.org
>> > Subject: Equest-users Digest, Vol 8, Issue 18
>> > To: equest-users at lists.onebuilding.org
>> > Date: Mon, 17 Nov 2008 07:54:32 -0800
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>> > 1. No Roof Conduction Losses (Tony Kriel)
>> > 
>> > 
>> > ----------------------------------------------------------------------
>> > 
>> > Message: 1
>> > Date: Mon, 17 Nov 2008 09:54:03 -0600
>> > From: "Tony Kriel" <tkriel at sustaineng.com>
>> > Subject: [Equest-users] No Roof Conduction Losses
>> > To: <equest-users at lists.onebuilding.org>,
>> > <bldg-sim at lists.onebuilding.org>
>> > Message-ID: <000901c948cc$b7864c90$0500a8c0 at LakeWaubesa>
>> > Content-Type: text/plain; charset="us-ascii"
>> > 
>> > Modelers,
>> > 
>> > 
>> > 
>> > I am trying to model the impact of adding additional insulation to a
>> 2-story
>> > pitched roof office building using Equest. My baseline model shows the roof
>> > U-value to be 0.026 and my parametric run to have a roof U-value of 0.019
>> > (report LV-I). However, there was no change in heating and cooling energy
>> > usage. I then looked at the building peak load components (report LS-C) and
>> > noticed that there are no roof losses for either run.
>> > 
>> > 
>> > 
>> > So the main question I have is; why are there no roof conduction losses?
>> > Have I incorrectly modeled something or is there an issue with pitched
>> roofs
>> > and conduction losses in Equest. I have attached the pd2 and inp files for
>> > these runs for anyone's review.
>> > 
>> > 
>> > 
>> > Any help would be greatly appreciated.
>> > 
>> > 
>> > 
>> > Thanks,
>> > 
>> > 
>> > 
>> > Tony Kriel, LEED AP
>> > 
>> > Mechanical Engineer
>> > 
>> > tkriel at sustaineng.com
>> > 
>> > (608) 231-9664 ext. 16
>> > 
>> > 
>> > 
>> > Sustainable Engineering Group, LLC.
>> > 
>> > 431 Charmany Drive, Suite 102
>> > 
>> > Madison, WI 53719
>> > 
>> > www.sustaineng.com
>> > 
>> > 
>> > 
>> > <mailto:tkriel at sustaineng.com>
>> > 
>> > 
>> > 
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