[TRNSYS-users] minmassflowrate

[David BRADLEY]

Michael,
   I have run into this problem as well, particularly in Trnsys16 and I 
was not ever able to resolve it. In the end, I had to increase my 
flowrate through the floor enough (or segment the floor enough) so that 
the flow rate I was giving got above that threshold. My suspicion is 
that Type56 calculates the required minimum flow at one temperature and 
then corrects the actual flowrate for some temperature dependent 
property during the simulation. If your example is simple enough and you 
are willing, please send it our way so that we can try and track down 
the cause!
Best,
  david


On 6/18/2012 16:24, Michael Döbele wrote:
> 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
>
>
>
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> TRNSYS-users at cae.wisc.edu
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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