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

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@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@lists.onebuilding.org>
Cc: Tim McDowell <mcdowell@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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