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

[Christian Herløv Krintel <s103618@student.dtu.dk>]

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@transsolar.com
> Web:      www.trnsys.de
>
>
> -----Ursprüngliche Nachricht-----
> Von: TRNSYS-users [mailto:trnsys-users-bounces@lists.onebuilding.org]
> Im Auftrag von Christian Herløv Krintel
> Gesendet: Freitag, 11. März 2016 09:12
> An: trnsys-users@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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