[TRNSYS-users] Problem with adjacent window

[David BRADLEY]

Christina,

   Thanks for responding to this with such a comprehensive explanation!

David



On 03/17/2021 04:20, hotline via TRNSYS-users wrote:
> Hi Toni,
>
> you said you are using an internal shading factor for the adjacent 
> window, right? In contrast to external shading, which just uses a 
> simple factor to determine the shading (ESHADE = 1 -> Transmission = 
> 0), internal shading is modelling  much more detailed effects, see 
> image below:
>
>
> Of all the radiation coming in through the window, a part is absorbed 
> by the shading device and then released to the airnode through 
> convection, some is reflected towards the window, again there we have 
> absorption, convection and reflection back towards the zone and so on. 
> Therefore, an internal shading device can never prevent all solar 
> gains from entering a zone. Please see /5.2.4.6. Definition of a New 
> Window Type /and /5.4.2.9. External and Internal Shading Devices /of 
> the Multizone Building part in the TRNSYS Documentation for more info 
> on this.
>
> Best regards,
> Christina
>
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> ------------------------------------------------------------------------
> *Von:* TRNSYS-users <trnsys-users-bounces at lists.onebuilding.org> im 
> Auftrag von Toni Calabrese via TRNSYS-users 
> <trnsys-users at lists.onebuilding.org>
> *Gesendet:* Dienstag, 16. März 2021 18:00
> *An:* TRNSYS users mailing list at OneBuilding.org 
> <trnsys-users at lists.onebuilding.org>
> *Cc:* Toni Calabrese <toni.calabrese at ost.ch>
> *Betreff:* [TRNSYS-users] Problem with adjacent window
>
> Hi,
>
> I am working in Trnsys18. I have a building model with two thermal 
> zones (Wintergarten and one room) with an external window for the 
> wintergarten and an adjacent window between the two zones. If I set 
> the external shading factor of the external window to 1, I have no 
> solar gains in the two zones, as it should be -> CORRECT!
>
> I tried then to shade just the adjacent window between the two zones 
> (int. shading factor of 1 in TRNBUILD) and I expected solar gains just 
> in the wintergarten, but not in the room. I got solar gains in both 
> zones. It seems that I am not able to shade completely just the 
> adjacent window.
>
> Which is the problem?
>
> ------------------------------------------------------------------------
>
> *Toni Calabrese*, MSc.
>
> Wissenschaftlicher Projektleiter
>
> toni.calabrese at spf.ch <mailto:toni.calabrese at spf.ch> 
> |toni.calabrese at ost.ch <mailto:toni.calabrese at ost.ch>
>
> T +41 58 257 4827
>
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>
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI  53703 USA

P:+1.608.274.2577
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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