Re: [TRNSYS-users] Type 11d

[David BRADLEY <d.bradley@tess-inc.com>]

Manrique,
  If you are modeling a tempering valve, then the control signal for the mixing valve is actually calculated at the diverter where the flow of liquid splits into the portion that will go to the heat source and the portion that will be used to temper the heat source if it gets too hot. Have a look at Type11b. You can then use a simple flow mixer (i.e. not a controlled one) in order to remix the two liquid streams. If your situation is different then you can always write an equation that takes the temperature of the two streams as inputs and computes the fraction of each that is needed in order to arrive at your desired temperature.
kind regards,
 David

On 4/21/2015 7:04 AM, Manrique Delgado Benjamin wrote:

Hi,

 

I want to implement a flow mixer with a defined outlet temperature. The description of Type 11d seems to be what I need:

 

“This instance of the Type11 model uses mode 3 to model a controlled flow mixer in which two inlet liquid streams are mixed together according to an internally calculated control function so as to maintain the mixed outlet temperature at or below a user specified value.”

 

However, there isn’t any input where to specify the outlet temperature. Do I need to calculate separately the control signal? If so, then what is the advantage of using this type instead of a simple Tee-piece?

 

 

Thanks,

Benjamin Manrique

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