[TRNSYS-users] Trnsys

[Jones Marcus]

Actually, I am wrong in my last email! If you use type 92 or 682 you will not properly model psychrometrics of the ventilation stream. Because you are dealing with moist air (latent and sensible load), you should use the flow stream load for moist air - TESS Type 693, or else model an actual cooling coil with chilled water (TESS Types 508)!

Sorry for any confusion,

Marcus

MARCUS JONES, MSc
Energy Department
Sustainable Building Technologies

AIT Austrian Institute of Technology
Österreichisches Forschungs- und Prüfzentrum Arsenal Ges.m.b.H.
Giefinggasse 2 | 1210 Vienna | Austria
T +43(0) 50 550-6387 | M +43(0) 664 210 24 15 | F +43(0) 50550-6598
marcus.jones at ait.ac.at<mailto:marcus.jones at ait.ac.at> | http://www.ait.ac.at<http://www.ait.ac.at/>
FN: 165088b HG Wien | UID: ATU46577208 This email and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient, please notify the sender by return e-mail or by telephone and delete this message from your system and any printout thereof. Any unauthorized use, reproduction, or dissemination of this message is strictly prohibited. Please note that e-mails are susceptible to change. Österreichisches Forschungs- und Prüfzentrum Arsenal Ges.m.b.H. shall not be liable for the improper or incomplete transmission of the information contained in this communication, nor shall it be liable for any delay in its receipt.

From: Jones Marcus [mailto:Marcus.Jones at ait.ac.at]
Sent: March 23, 2010 12:12 PM
To: 'Guy THOMAS'; trnsys bradley; trnsys trnsys
Subject: Re: [TRNSYS-users] Trnsys

Guy,

I believe that your suggestion of connecting the PID controller to the auxiliary cooler would work fine. If you have convergence or cycling problems with the PID controller, set the gain extremely low, and the integral equal to the simulation timestep. If you are looking for a cooler with a cooling rate as input, check TESS type 682 - flow stream loads, or you could model an actual cooling coil with chilled water.

Best regards,

Marcus


MARCUS JONES, MSc
Energy Department
Sustainable Building Technologies

AIT Austrian Institute of Technology
Österreichisches Forschungs- und Prüfzentrum Arsenal Ges.m.b.H.
Giefinggasse 2 | 1210 Vienna | Austria
T +43(0) 50 550-6387 | M +43(0) 664 210 24 15 | F +43(0) 50550-6598
marcus.jones at ait.ac.at<mailto:marcus.jones at ait.ac.at> | http://www.ait.ac.at<http://www.ait.ac.at/>
FN: 165088b HG Wien | UID: ATU46577208 This email and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient, please notify the sender by return e-mail or by telephone and delete this message from your system and any printout thereof. Any unauthorized use, reproduction, or dissemination of this message is strictly prohibited. Please note that e-mails are susceptible to change. Österreichisches Forschungs- und Prüfzentrum Arsenal Ges.m.b.H. shall not be liable for the improper or incomplete transmission of the information contained in this communication, nor shall it be liable for any delay in its receipt.

From: Guy THOMAS [mailto:guytho at hotmail.com]
Sent: March 22, 2010 4:08 PM
To: trnsys bradley; trnsys trnsys
Subject: [TRNSYS-users] Trnsys

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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