[TRNSYS-users] Why type11d changes the outlet temperature?

[David BRADLEY]

Hooman,

   Make sure that there is flow through the Type11 when you are seeing 
it change the temperature. If flow is zero then the Type has to set the 
outlet temperature to something. There have been some versions of Trnsys 
that set the outlet temperature to the inlet temperature (or in the case 
of a mixer to one of the inlet temperatures. There have been other 
versions in which Type11 simply held the last calculated value until 
flow became non zero again. Again, this only has to do with the 
situation when there is no flow.

   If that does not solve the problem and if you are using v18 then I 
would recommend you send the project to your distributor for some help.

kind regards,

  David


On 06/08/2020 16:33, Hooman Azad via TRNSYS-users wrote:
>
> Tim
>
> I already tried 11h, still, the outlet temperatures of the mixtures of 
> two identical flows are not the same. I tried to use an equation 
> component instead, to make TRNSYS understand I simply want to mix and 
> divide some flows, with no temperature change, and it worked!
>
> Thanks anyway
>
> Hooman
>
> *From:*TRNSYS-users 
> [mailto:trnsys-users-bounces at lists.onebuilding.org] *On Behalf Of *Tim 
> McDowell via TRNSYS-users
> *Sent:* Monday, June 8, 2020 5:04 PM
> *To:* TRNSYS users mailing list at OneBuilding.org 
> <trnsys-users at lists.onebuilding.org>
> *Cc:* Tim McDowell <mcdowell at tess-inc.com>
> *Subject:* Re: [TRNSYS-users] Why type11d changes the outlet temperature?
>
> Hooman Azad -
>
> If you are wanting to simply mix two fluid streams together use the 
> "Tee Piece" component (11h) rather than the "Controlled Flow Mixer" 
> component (11d).
>
> Regards,
>
> Tim
>
> ---
> Timothy P. McDowell
> Executive Vice President
> Thermal Energy System Specialists, LLC
> 3 N Pinckney St, Suite 202
> Madison, WI 53703
> office: 608-274-2577
> cell: 608-225-5250
>
> On 2020-06-05 05:10, Hooman Azad via TRNSYS-users wrote:
>
>     Dear friends
>
>     In Figure 1 the outlets of two collectors (CPC 1 and CPC 2) with
>     the same temperatures are connected to a type11d (Mixer). Although
>     type11d is not supposed to change the temperatures, the mixer’s
>     outlet temperature in Figure 2 is something fixed, not equal to
>     inlet temperatures…. I wonder why.
>
>     Thanks for your help
>
>     Hooman
>
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
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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