[TRNSYS-users] Problem with Active Layer

[David BRADLEY]

Toni,

  I have run into this problem from time to time as well and was never 
able to discover the cause. I found that if I increased the flow rate to 
about 1.1 times the stated required flow the the error usually went 
away. The other thing you can do, of course, is to segment the floor so 
that it will allow you to enter the flow that you wanted.

kind regards,

  David


On 02/08/2021 03:08, Toni Calabrese via TRNSYS-users wrote:
>
> Hi everyone,
>
> For a pilot project we are analyzing a heating system in which an 
> "external wall heating system" is installed on the façade. Basically 
> we have a wall with an active layer that is insulated on the back in 
> order to decrease the losses of this active layer to the outside.
>
> With a pipe spacing of 13.5 cm the system was working good. For a 
> parametric study, I would like to run a study varying the pipe 
> spacing. Setting the pipe spacing to 10 cm (instead of 13.5 cm) the 
> system does not simulate anymore. It gives me the following error:
>
> Message : Specific fluid mass flow of active layer in surface   24 
> below minimum value of 8.01 kg/m2h Please, increase the minimum mass 
> flow rate or use the autosegmentation feature of TRNBuild for 
> subdividing the surface.
>
> I checked the massflow rate and I am sure that the mass flow rate is 
> higher than the minimum. I tried to increase the massflow rate through 
> the pump of the system but it does not work. Which is the problem?
>
> Here the data of my simulation:
>
> -TRNSYS 17
>
> -Wall area: 10.16 m2
>
> -Massflow rate system: 86 kg/h
>
> ------------------------------------------------------------------------
>
> *Toni Calabrese*, MSc.
>
> Wissenschaftlicher Projektmitarbeiter
>
> toni.calabrese at spf.ch <mailto:toni.calabrese at spf.ch> 
> |toni.calabrese at ost.ch <mailto:toni.calabrese at ost.ch>
>
> T +41 58 257 4827
>
> SPF Institut für Solartechnik
>
> OST – Ostschweizer Fachhochschule
>
> Oberseestr. 10 | CH-8640 Rapperswil | Switzerland | _www.spf.ch 
> <http://www.spf.ch>_| _www.ost.ch <http://www.ost.ch>_
>
> OST – Ostschweizer Fachhochschule ist der Zusammenschluss aus FHS 
> St.Gallen, HSR Rapperswil und NTB Buchs.
>
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at lists.onebuilding.org
> http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org

-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI  53703 USA

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

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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/attachments/20210208/d74bc2f8/attachment.htm>