[Bldg-sim] Building Heat Gains

[Nathan Kegel]

Hi Sambhav,

You can send any question into support at iesve.com<mailto:support at iesve.com> if you’re looking for help with understanding this.  They’ll be able to take a detailed look at your model and help you set the model up correctly for what you’re trying to study.

Assuming you’ve modelled the shades as local shade and not a room, then you won’t see any impact of a “thermal bridge”.  However, if you modelled the shades (fins) as rooms, then you would see a “thermal bridge” – especially since the default construction that would be assigned the point where the two “rooms” meet would be an interior partition made up of nothing but two pieces of gypsum board with an air gap between then.

This question has come up recently with regard to a project that has many non-thermally broken vertical fins in CZ6.

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From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Andrew Corney
Sent: Monday, November 24, 2014 9:01 AM
To: Duggin, Cory
Cc: bldg-sim; Attiq
Subject: Re: [Bldg-sim] Building Heat Gains

Hi Sambhav,

Yeah - I'd agree with Cory - you probably have a higher glazing surface temperature with the unshaded model and I wouldn't be surprised if that is part of the conduction equation, meaning you are less likely to gain heat through conduction if the glazing is in full sun.

cheers,

Andrew

On Mon, Nov 24, 2014 at 2:55 PM, Duggin, Cory <Cory.Duggin at tlc-eng.com<mailto:Cory.Duggin at tlc-eng.com>> wrote:
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
direct:

615-346-1939<tel:615-346-1939>



From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org<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

Regards
Sambhav

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.

Attiq

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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