[TRNSYS-users] Massless layer + Very small zone

[Wolf, Stefan]

> It seems that it is not possible to enter a wall area smaller than 0.1m².
 
I use TRNBuild 1.0.94 and I can enter smaller wall areas (I took 0,001 ).
But TRNBuild shows in the upper window area values not smaller then 10^-2.
But open the *.inf or the *.bui by a texteditor shows the real value. 
Attention: I don't know how TRNSYS treats such small vallues -> test it!
 
U-values: Did you consider the Transfer Coefficients!!
 
Stefan

-----Original Message-----
From: RENZI Virginie 217644 [mailto:virginie.renzi at cea.fr]
Sent: Monday, April 21, 2008 2:03 PM
To: trnsys-users at engr.wisc.edu
Subject: [TRNSYS-users] Massless layer + Very small zone



Dear users,

 

I'm trying to model a small box made of aluminium (2mm thick) and in order
to define the walls I used a massless layer. Thus I entered a thermal
resistance (thickness divided by conductivity) for my new layer but the
U-value given in the Wall Type Manager is different from my corresponding
U-value. Does someone know why? Does it deal with the "combined heat
transfer coefficients"? Is the U-value from the Wall Type Manager used at
some point in the calculation?

 

I have another question, related to the size of the zone. It seems that it
is not possible to enter a wall area smaller than 0.1m². Is it right? if
yes, is there another way to model a very small zone?

 

Thanks for your help

 

Virginie

 

 

 

 

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