[TRNSYS-users] Trnsys

[David Bradley]

Guy,
  To add to the email that Marcus sent, Type92 actually modulates its 
energy use to meet whatever setpoint temperature you want it to as long 
as the control signal is set to 1. If the control signal is set to 0, it 
doesn't provide any cooling. In a sense, when active, it has "perfect" 
control. Marcus is quite correct that it doesn't model any 
psychrometrics on the air side; you could attach it to a Type33 in order 
to figure out the outlet air condition but given its controls, it isn't 
ideal. The second thing you should look at is exactly how you want your 
PID controller to work. A PID controller typically adjusts a damper 
position, a fan speed or a pump speed to keep some outlet (temperature, 
flow rate, etc.) at a set point. There are very few cooling devices 
where a PID controller would watch a zone temperature and be connected 
directly to a cooling capacity adjustment. I would suggest that you look 
through the TESS HVAC library as it contains a number of cooling 
devices. Once you choose the device, its controls should be fairly easy 
to determine.
Best,
 David


Guy THOMAS wrote:
> Hello everybody,
> I'm passing a ventilation stream in my type 56 zone in Simulation 
> studio (after have put temperature, flowrate and RH as inputs in 
> TRNBuild). I am passing the flowrate in type 92 to cool it. And I 
> would like to watch the zone temperature and control it with an PID 
> controller type 23.
> But the type 92 have a control function as input and not a cooling rate.
> So, is it possible to put a maximum cooling rate in the parameter of 
> type 92 and connect the control signal from type 23 to type 92 control 
> function (in the type 23 parameter i have put a control signal varying 
> between 0 and 1) to control the temperature?
> Or is there other solution to cool the air with a PID controller?
> Best regards
> Guy THOMAS
> Etudiant CNAM Paris
>
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Thermal Energy System Specialists (TESS), LLC 
David BRADLEY                      22 N. Carroll Street - Suite 370 
Partner                            Madison, WI 53703 
                                   USA
P: +1.608.274.2577 
F: +1.608.278.1475
E-mail: bradley at tess-inc.com 
Web Pages:  http://www.tess-inc.com    and      http://www.trnsys.com

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