[Equest-users] Roof Conduction - Where are you?

[Craig Simmons]

I took a look at the DOE2.2 Vol.4 Manual and I think my confusion is due to the information that is reported in the LS-x reports. The load reports are based on the design insidoor temperatures (e.g., 70F). Therefore, the loads reports do not show any interior surface conduction unless you have different design temperatures in adjacent spaces.

 

During the simulation, unconditioned spaces (e.g., the plenum) will not have constant temperatures, so hourly reports should show the roof heat being transferred to the space via interior surfaces. I haven’t actually gone fishing for the correct hourly reports yet, but I’m guessing they’re there.

 

Thanks.

 

Craig Simmons, LEED AP

The Green Engineer, LLP

 

 

 

From: John Aulbach [mailto:jra_sac at yahoo.com] 
Sent: Thursday, August 27, 2009 1:33 PM
To: equest-users at lists.onebuilding.org; Craig Simmons
Subject: Re: [Equest-users] Roof Conduction - Where are you?

 


Aren't they in the return air load? Or if ducted returned, simply translated over time into the space below?

--- On Thu, 8/27/09, Craig Simmons <craig at greenengineer.com> wrote:


From: Craig Simmons <craig at greenengineer.com>
Subject: Re: [Equest-users] Roof Conduction - Where are you?
To: equest-users at lists.onebuilding.org
Date: Thursday, August 27, 2009, 10:19 AM

I recently noticed this as well and decided to revive this thread to see if anyone has insight. How do the roof conduction loads translate to HVAC loads?

 

Based on the models I’ve run it’s obvious that roof conduction is being accounted for on the HVAC side and it appears to be about the right magnitude. However, added roof conduction loads to the plenum do not translate to any added space loads or  building loads in the LS-x reports. Does anyone have insight on how eQuest is handling them and why they do not show up in space or building loads reports?

 

Thank you in advance.

 

Craig Simmons, LEED AP

The Green Engineer, LLP

 

 

From: Eckwahl, Tom [mailto:TEckwahl at karpinskieng.com] 
Sent: Thursday, July 23, 2009 9:29 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Roof Conduction - Where are you?

 

My baseline building energy usage is much lower than expected and in trying to track down the cause I’ve found that the “Building Peak Load Components” lists no roof heat gain or heat loss.  I did find that there is a gain/loss located in the upper floor plenum and it’s shown in the “Space Peak Load Components”.  

 

Is the plenum not considered part of the building?  I’m concerned that the plenum walls and roof are not being included in the energy modeling run.

Thomas N. Eckwahl
Project Engineer, Mechanical

karpinski
ENGINEERING

 


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