Michael,
The min. mass flow rate calcualted by TRNbuild may
differ from the calculated during the simulation
If there it switches from turblent to laminar flow. However,
this isn’t your problem.
I had a quick look at your file
When I open your file b17 I get an error message for
surface 15 (the one with active layer):
The adjacent surface numbers of surface 12 and 15 are wrong!!
ZONE Z02
RADIATIONMODE
BEAM=STANDARD : DIFFUSE=STANDARD : LONGWAVE=STANDARD
: GEOMODE=MANUAL
AIRNODE Z02
WALL =IW01 : SURF= 11 : AREA= 40.66 :
INTERNAL
WALL =ID01 : SURF= 12 : AREA= 44.87
: ADJACENT=Z02 : ADJ_SURF=5
: FRONT : INTEMP = INPUT 1*Z02_TABS_TETA_SW : MFLOW = INPUT 1*Z02_TABS_MASSFLOW
: NLOOP = 6 : MFLOWMIN = 15
WALL =ID02 : SURF= 13 : AREA= 5.09 :
BOUNDARY=IDENTICAL
WALL =ID03 : SURF= 14 : AREA= 12.69 :
BOUNDARY=0
WALL =ID01 : SURF= 15 : AREA= 44.87
: ADJACENT=Z02 : ADJ_SURF=1
: BACK : INTEMP = INPUT 1*Z02_TABS_TETA_SW : MFLOW = INPUT 1*Z02_TABS_MASSFLOW
: NLOOP = 6 : MFLOWMIN = 15
WALL =ID05 : SURF= 16 : AREA= 12.69 :
BOUNDARY=IDENTICAL
I assume you edit the file manually.
If I delete the wrong ADJ_SURF, and I reopen it
TRNbuild it assigns the the correct numbers.
Marion
Dipl.-Ing.
TRANSSOLAR: KlimaEngineering - Technologien für energieeffizientes
Bauen und Nutzerkomfort in Gebäude
Munich - New York -
Transsolar Energietechnik GmbH, Curiestrasse 2, 70563
Amtsgericht
Geschäftsführer: Dipl.Ing. Matthias Schuler, Dipl.Ing. Thomas Auer,
Dipl.Phys. Stefan Holst, Prof. Dipl.-Ing. Bleicher
-----Ursprüngliche Nachricht-----
Von: Michael Döbele [mailto:michael.doebele@hochschule-bc.de]
Gesendet: Montag, 18. Juni 2012 23:25
An:
Betreff: [TRNSYS-users] minmassflowrate
Dear TRNSSYS User,
i am trying to run an active layer with an specific massflow rate of 15
kg/h m² (absolute value 654.15 kg/h). TRNBuild calculates a minimum
allowed massflow rate of 10.25 kg/h. (446 kg/h) ....so far so good.
But when I set this massflow rate in TRNSYS Studio via Input to the
wanted 654.15 kg/h I get following error
"specific fluid mass flow of active layer in surface 2 below
minimum
value of16.26/m2h, increase the minimum mass flow rate or use
autosegmentation feature of TRNBuild for subdividing the surface."
This is a really strange behavior. The massflow criteria varies and
seems to depend on the inlet temperature.. I also tried
autosegmentation
- I didn´t help, I got the same error message.
Please help me out here..
Thank you
Michael Döbele