Re: [TRNSYS-users] Problem in creating a new wall type

[gizmoog <gizmoog@free.fr>]

you should add the external and internal resistance too, for instance 
0.17 (an exterior vertical wall).

gizmoog

Issa Jaffal a écrit :
> Dear All
> When i was trying to make a new wall type in the wall type manager; i 
> couldnt explain how the Uvalue in the wall type manager is calculated, 
> for istance:
>
> if i make a wall with a single layer of 0.1 m of Concrete  U-value = 
> 4.595 and if i make a wall with a single layer of 0.2 m of Concrete 
> (same layer type)  U-value=3.770 but normaly the U-value will be devided 
> by 2 if i double the thikness form 0.1 to 0.2!!!
>
> I tried to change the values of convective heat transfert coefficient 
> but  the Uvalue didnt change:
>
> So how we can explain theses values the U-value ?
>
> Regards
> Issa JAFFAL
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