[TRNSYS-users] Type 56 radiation with wall type "Boundary"

[hotline]

Dear Christian,

Sorry, I missed that information regarding wall type "boundary".
For Boundary Walls, no radiative exchange on the back side is calculated.

Best
Jakob

_________________________________________________________________________________________________

Jakob Merk
TRNSYS Software Team

Transsolar Energietechnik GmbH
Curiestraße 2
70563 Stuttgart
Fax:        +49 711 67976-11
Email:    hotline at transsolar.com
Web:      www.trnsys.de 

-----Ursprüngliche Nachricht-----
Von: TRNSYS-users [mailto:trnsys-users-bounces at lists.onebuilding.org] Im Auftrag von Christian Herløv Krintel
Gesendet: Freitag, 11. März 2016 15:51
An: TRNSYS users mailing list at OneBuilding.org
Betreff: Re: [TRNSYS-users] Type 56 radiation with wall type "Boundary"

Dear Jacob,

Thank you for your reply. You describe that longwave radiation is included in Type 56 for external walls, but how about boundary walls where I prescribe an air temperature on the back side?

Best regards
Christian

hotline skrev den 2016-03-11 15:28:
> Dear Christian,
> 
> longwave radiation of external walls is included in Type 56. Input 3
> (T_sky) of Type 56 defines the temperature of the surrounding for 
> longwave radiation exchange.
> 
> So use measured surface data from the climate chamber as Input for 
> T_sky.
> Notice: This approach is only valid for climate chamber walls with an 
> emissivity close to 1.
> 
> Best regards
> Jakob
> 
> ______________________________________________________________________
> ___________________________
> 
> Jakob Merk
> TRNSYS Software Team
> 
> Transsolar Energietechnik GmbH
> Curiestraße 2
> 70563 Stuttgart
> Fax:        +49 711 67976-11
> Email:    hotline at transsolar.com
> Web:      www.trnsys.de
> 
> 
> -----Ursprüngliche Nachricht-----
> Von: TRNSYS-users [mailto:trnsys-users-bounces at lists.onebuilding.org]
> Im Auftrag von Christian Herløv Krintel
> Gesendet: Freitag, 11. März 2016 09:12
> An: trnsys-users at lists.onebuilding.org
> Betreff: [TRNSYS-users] Type 56 radiation with wall type "Boundary"
> 
> Hi all,
> I am trying to model a small 0.5 m cubicle test cell with opaque 
> walls, placed inside a climate chamber with a step increase of the air 
> temperature.
> I use Type 56 with all six walls with wall type "Boundary" and the 
> temperature step function as the boundary. However the air temperature 
> of the test cell increases at a slower rate than from the experiment, 
> and I wonder if longwave radiation from the external cubicle walls to 
> the walls of the climate chamber somehow can be included in the 
> simulations?
> 
> Best regards
> Christian Krintel
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