[TRNSYS-users] active layer

[Filippo Busato <busato@gest.unipd.it>]

Title: ------------------------------------------------------------------------------------------

Hi everbody!

I have a question concerning the active layer. While I was trying to implement active layers in a building structure, compiling the .bui file I got the following message:

"The min. desired inlet mass flowrate is smaller than the min. allowed inlet mass flowrate.
You may use autosegmentation
MinflowCalc=11.0326
MFLOWMIN=10"

I thought MFLOWMIN was calculated from the piping features (diameter, length), in order to avoid transition to laminar flow, as it sounded reasonable, is it correct?




So I tried to change the MinflowCalc from 10 to 11 in the specification window of the surface in the building model (TRNBUILD).
Then, when I compile it the second time I get the same message:

"The min. desired inlet mass flowrate is smaller than the min. allowed omòet mass flowrate.
You may use autosegmentation
MinflowCalc=11.05...
MFLOWMIN=11"

What do MFLOWMIN and MinflowCalc mean? Does MinflowCalc depend only on geometrical features?
Can anyone help me in setting these features correcly?


Thank you in advance
Filippo.

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Filippo Busato - Ph.D.
ingegnere

Università degli Studi di Padova
Dipartimento di Tecnica e Gestione dei sistemi industriali
Str.lla S.Nicola, 3 - 36100 Vicenza (VI)

mailto: busato@gest.unipd.it
homepage: http://www.gest.unipd.it/~busato

skype: foucault76
tel: +39 0444 998778
fax: +39 0444 998884
mob: +39 347 1207174
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