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

[hotline <hotline@Transsolar.com>]

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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