[TRNSYS-users] Tempering Valve Control Type 115 TRNSYS 18

[David BRADLEY via TRNSYS-users]

Paul,

   I am going back through some emails that came in while I was away. 
Did you get this figured out? If not then the idea of the tempering 
valve control is that it determines the fraction of hot and cold water 
that need to be mixed together to arrive at or below a desired maximum 
temperature. In a real system this could be accomplished by a PID but 
mathematically if you know the two source temperatures (one hot, one 
cold) then you can compute the ratio required. The PID and the tempering 
valve controller are redundant. Both accomplish the same thing.

kind regards,

  David



On 06/27/2017 09:11, Gillet Paul via TRNSYS-users wrote:
> Dear all,
>
> I'm modeling an ahu using simulation studio. The fluid (water) that passes though the heat coil is provided by a boiler in which the temperature should be controled. That is the reason why i put a tempering valve control (Type115) and a PID controller (Type 22 or 23) to compare the setpoint temperature and the heating temperature.
> Why there is not "Control Signal" input in the type 115 inlet ? It is logical to control the signal of the tempering valve with the control signal output of the PID controler. I really don't understand how can I link them !
> Thanks for any information you can give me.
>
> Have a great day,

-- 
***************************
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

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