[Bldg-sim] Building Heat Gains

Duggin, Cory Cory.Duggin at tlc-eng.com
Mon Nov 24 06:55:08 PST 2014

The VE doesn’t model thermal bridging, so that isn’t it.  What climate is your building in?  What percentage glazing are the east and west walls?  Are you losing heat through the envelope or gaining it?  It could have to do with the shades blocking more sun from heating up the outside of the envelope on those walls, which then changes the delta T and resulting conduction gain.

Cory Duggin, EI, LEED AP BD+C
Associate/Energy Engineer
TLC Engineering for Architecture


From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Sambhav Tiwari
Sent: Monday, November 24, 2014 2:21 AM
To: Attiq
Cc: bldg-sim
Subject: Re: [Bldg-sim] Building Heat Gains

Hi All,
          Thanks for the reply this analysis was done in ies ve and the external conduction gains are increasing with shading while solar gains are reducing

i am sending the snapsort of the building with shading in east and west


On Sat, Nov 22, 2014 at 9:46 PM, Attiq <aur at bepc.biz<mailto:aur at bepc.biz>> wrote:
The shades are attached to the building exterior and there is no thermal break between the shades and the exterior walls. The shades act as fins conducting heat to the outside.


Sent from my iPhone

> On Nov 22, 2014, at 7:15 AM, Sambhav Tiwari <tiwari.sambhav at gmail.com<mailto:tiwari.sambhav at gmail.com>> wrote:
> Dear All,
>                I am analyzing a rectangular building with each and west facades structured glazed and forming longer sides of rectangle  and i shaded these facades with louvers (shading device)
> I compared the annual heat gains of two case1 building with no shading case 2 building with shading(louvers) what i found was there is considerable reduction in annual solar gains in building but the annual external conduction gains in building have increased after shading i am unable to understand this.
> Any one who can share his ideas on this.
> Warm Regards
> Sambhav Tiwari

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