Re: [TRNSYS-users] Emissivity of wall material (TYPE56)

[Philippe André <p.andre@ulg.ac.be>]

Dear Yoshi,

Another possibility we have used in the past is to change the average 
surface temperature parameter (available under the "project" window / 
properties in TRNBUILD) according to the formula given below:


This way, it is possible to define a fictitious coefficient TmeanNEW which 
is the Tmean which is needed in the model in order to have the effect of a 
modification of the surface emittance:

                                                                            
                            (7)





where   eNEW    is the required emittance.

Best regards,



Philippe.





Philippe ANDRE
Université de Liège
Département Sciences et Gestion de l'Environnement
185, Avenue de Longwy
B-6700 ARLON
Tel: 32-(0)63-230 858
Fax: 32-(0)63 230 800
email: p.andre@ulg.ac.be
WEB: http://www.dsge-arlon.ulg.ac.be/energie


----- Original Message ----- 
From: "Erik Olsen" <olsen@transsolar.com>
To: <trnsys-users@cae.wisc.edu>
Sent: Friday, May 29, 2009 2:29 PM
Subject: Re: [TRNSYS-users] Emissivity of wall material (TYPE56)


> Hi Yoshi
>
> TRNSYS 16 doesn't allow you to directly change the long-wave emissivity. 
> TRNSYS 17 will include this feature - TRNSYS 17 is planned for released in 
> late September.
>
> As an approximation in the meantime you could consider applying a wall 
> gain to add the additional heat that has been lost back in to the surface.
>
> Regards
> Erik Olsen
>
> ----- Original Message -----
> From: Yoshinaga Mika <yoshi@ccmfs.meijo-u.ac.jp>
> Sent: Wed, 5/27/2009 4:24am
> To: trnsys-users@cae.wisc.edu
> Subject: [TRNSYS-users] Emissivity of wall material (TYPE56)
>
> Dear David and all,
>
> I'm going to calculate the effect of the low emissivity material using
> TYPE 56, Multi zone building. In TrnBuild, "Wall Type Manager" accepts
> "Solar Absorptance" only and there seems not to be characteristic inputs
> relating to long wave radiation How could I simulate the low emisivity
> material as inside surface ?
>
> Mika YOSHINAGA
> Meijo Univ., Japan
> yoshi@ccmfs.meijo-u.ac.jp
>
>
>
>
>
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