[Equest-users] Roof vs Exterior Wall Load

[Jonathan Smith]

Hi Bruce:

Thanks you for your reply. 

 

The LS-F report I'm reviewing is a building wide report which should be
inclusive of all spaces. As stated previously, MBTUs through ROOF
components is listed as zero. However, the space level report (LS-E) for
the one of the plenums with a roof component shows heat loss of the roof
component. This is true for some of the other plenum spaces. Any ideas
why the space level report (LS-E) ROOF components are not reported on
the building wide report (LS-F) as roof components?

 

Jonathan

 

From: Bruce Easterbrook [mailto:bruce5 at bellnet.ca] 
Sent: Wednesday, September 07, 2011 9:08 AM
To: Jonathan Smith
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Roof vs Exterior Wall Load

 

In the room space the roof is actually the ceiling.  Because the room
and plenum spaces are close or the same temperature there is minimal or
no heat loss between them.  You need to go to the plenum space for the
heat loss through the exterior roof.  If you want the heat loss for the
full floor to floor space you have to add the room and plenum losses.
The plenum will have some wall surfaces as well.
Bruce Easterbrook P.Eng.
Abode Engineering

On 06/09/2011 01:46 PM, Jonathan Smith wrote: 

RE: Detailed Report, LS-F Building Monthly Load Components 

 

Why would roof heat losses be zero in a model defined with plenum spaces
that have roofs components? In report LS-F, there are no losses reported
in 'Roof' and 'Wall' heat losses seem exceptionally high, as if 'Roof'
losses are reported in 'Walls'. 

 

All spaces were created using the eQuest wizard mode. Inspecting the
"exterior surface properties", the word "Roof" appears below the surface
name. All roof constructions are made with layers input, having a
U-Value 0f 0.043. When creating exterior surfaces in detailed edit mode,
no option exists for defining an exterior surface as a roof or wall. 

 

So, how are the loads associated with roofs reporting in LS-F? What
other reasons might roof loads not report, or at least not report in the
correct load component?

 

Jonathan R. Smith AIA LEED(r)AP

 

 

40 Beaver Street
Albany, New York 12207
p: 518.463.8068 x268
f: 518.463.8069 
www.csarchpc.com <http://www.csarchpc.com/> 

 






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