Dear Yasmina EL HASNAOUI,
you may encounter this difference if you use the longwave radiation mode = standard.
In this case Trnsys uses the starnode approach to calculate the heat transfer of the front side
of a surface . (see 05-MultizoneBuilding.pdf Section 5.4.1.6). Thereby, the entered convective heat transfer coefficient
is used to calculated a so-c
from the starnode to the air. In order to save calculation time the calculation is performed based on an approx.
average surface temperature given under “properties” to the building. For NType 108 the effective coefficient is
calculated back from this combined equivalent coefficient with the current temperatures.
In general, this method yields to good results compared the detailed method although a difference in convective heat transfer
coefficient
encountered. You may confirm this for your model by using the detailed longwave radiation mode based on the Gebhart method.
In the mode, the convective and radiative heat transfer are calculated independently and the entered convective heat transfer
coefficient
is equivalent to Ntype 108.
Kind regards,
Transsolar Hotline Team
Von:
Gesendet: Mittwoch, 5. Februar 2014 08:52
An:
Betreff: [TRNSYS-users] The Front convective Heat Transfer Coefficient of Wall in TYPE 56
Dear TRNSYS users,
Does anybody know what is the difference between the front convective Heat Transfer Coefficient that you enter in type 56 and the type 56’s output c
Kind regards,
Yasmina EL HASNAOUI
Ingénieure Calculs
Pôle Process Industriel
Semicad
123 avenue Barthélémy Buyer
69005 Lyon – France
Tel : +33 (0) 426 10 66 94
yasmina.el-hasnaoui@cofelyaxima-gdfsuez.com
Cofely Axima et OMEGA Concept, des marques de la société AXIMA Concept
www.omega-concept-gdfsuez.com
P
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De :
Envoyé : Freed 24 jannewaris 2014 9:28
À :
Objet : [SUSPECTED IDENTITY THEFT] [TRNSYS-users] The Front convective Heat Transfer Coefficient of Wall in TYPE 56
Dear TRNSYS users,
Does anybody know what is the difference between the front convective Heat Transfer Coefficient that you enter in type 56 and the type 56’s output c
Kind regards,
Yasmina EL HASNAOUI
Ingénieure Calculs
Pôle Process Industriel
Semicad
123 avenue Barthélémy Buyer
69005 Lyon – France
Tel : +33 (0) 426 10 66 94
yasmina.el-hasnaoui@cofelyaxima-gdfsuez.com
Cofely Axima et OMEGA Concept, des marques de la société AXIMA Concept
www.omega-concept-gdfsuez.com
P
Pensez à l’environnement avant d’imprimer ce message.