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Re: [TRNSYS-users] Questions about TRNSYS/TRNFlow PID Controller to control Opening Factor in order to reduce CO2%



Dear all,

I chose the TYPE 23: PID controller, I design the system is that CONZ1(Mass concentration of CO2% in zoon) as Setpoint of PID controller is  1000ppm*1.98(co2 density)/1.293(air density)=0.00164 (kg/kg), the Control Signal's Output links to Control OP_Factor(Opening Factor of window), the real CONT1 (Mass concentration of CO2% in zoon) of Zone as Controlled Variable, but to my Surprise, CO2% still kept rising, PID cann't work, I try to look for the reason all the day,but draw a blank. I think it's a bug or other reasons? Please check the  Attachment.

Millions of thanks!

Br.

wang

2010/8/31 <trnsys-users-request@cae.wisc.edu>
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Today's Topics:

  1. TRNSYS error (Tshewang Lhendup)
  2. TRNSYS Training (Abdullatif Ben-Nakhi)
  3. Error with Psychrometric Routine? (Fred Betz)
  4. Re: Error with Psychrometric Routine? (David Bradley)


---------- 已转发邮件 ----------
From: Tshewang Lhendup <t.lhendup@pgrad.unimelb.edu.au>
To: trnsys-users@engr.wisc.edu
Date: Tue, 31 Aug 2010 12:30:00 +1000
Subject: [TRNSYS-users] TRNSYS error
Dear all,
 
I am working on simulation of a solar combined borehole thermal storage for
heating and cooling residential buildings using TRNSYS 17. The main Types
used in the model are Type 505b, 557a and 56.When I run the simulation I get
following error.

TRNSYS Message    427 : An OUTPUT from the specified component model has
been written to the global OUT array in a location beyond the allocated
number of outputs from this model. Please check the component carefully to
insure that INFO(6) is set correctly. The simulation has been aborted to
avoid problems caused by over-writing the outputs from other component
models  Reported information  : Not available.

As suggested in the TRNSYS archive, I looked at the *.lst and *.log files.
The error is generated by the Type 505. This error is very frequent and most
of the time I am able to debug by trial and error. But this time, I am not
able to do it. I suspect with the array size. Does any one have know what I
need to do. I cannot proceed further in my work due to this error.

With best regards,
Tshewang Lhendup



---------- 已转发邮件 ----------
From: Abdullatif Ben-Nakhi <abdnakhi@yahoo.com>
To: TRNSYS-users@cae.wisc.edu
Date: Mon, 30 Aug 2010 20:09:38 -0700 (PDT)
Subject: [TRNSYS-users] TRNSYS Training
Dear all,
 
I will travel to Leeds, UK within the coming 10 days and I will stay there for about 10 days. I Wonder if I get TRNSYS training during my stay period at Leeds. I am ready to travel to cities not far from Leeds for the TRNSYS beginners training course. Kindly, direct me to such training course.
 
Many thanks in advance,
 
Ben Nakhi
 


---------- 已转发邮件 ----------
From: Fred Betz <fbetz@aeieng.com>
To: "TRNSYS-users@cae.wisc.edu" <TRNSYS-users@cae.wisc.edu>
Date: Tue, 31 Aug 2010 09:19:41 -0500
Subject: [TRNSYS-users] Error with Psychrometric Routine?

I am passing 22.2 C dry bulb and 14.0 C wet bulb to the psychrometric routine (type 33f) and the output is 22.2 C dry bulb, 6. 8 C wet bulb and 0% RH, which is causing an error in the psychrometric routine for a total energy wheel.

 

The output should be approximately 60% RH.

 

The humidity ratio is also showing 0.0.

 

Please advise,

 

Fred

 

 

Fred Betz  PhD., LEED AP
Sustainable Systems Analyst

 

AEI | AFFILIATED ENGINEERS, INC.  
5802 Research Park Blvd. | Madison, WI  53719

P: 608.236.1175 | F: 608.238.2614  
fbetz@aeieng.com  |  www.aeieng.com  

 

 



---------- 已转发邮件 ----------
From: David Bradley <bradley@tess-inc.com>
To: Fred Betz <fbetz@aeieng.com>
Date: Tue, 31 Aug 2010 10:33:41 -0500
Subject: Re: [TRNSYS-users] Error with Psychrometric Routine?
Fred,
  perhaps I need to see the project. If you are passing 22.2 dry bulb and 14 wetbulb to Type33, it should just be spitting back the exact same thing with a calculation of RH. I just tried that and I'm getting an RH of 40% at 1atm pressure. When you say there is a 6.8C wetbulb, is that on the other side of the energy wheel?
David


On 8/31/2010 09:19, Fred Betz wrote:

I am passing 22.2 C dry bulb and 14.0 C wet bulb to the psychrometric routine (type 33f) and the output is 22.2 C dry bulb, 6. 8 C wet bulb and 0% RH, which is causing an error in the psychrometric routine for a total energy wheel.

 

The output should be approximately 60% RH.

 

The humidity ratio is also showing 0.0.

 

Please advise,

 

Fred

 

 

Fred Betz  PhD., LEED AP
Sustainable Systems Analyst

 

AEI | AFFILIATED ENGINEERS, INC.  
5802 Research Park Blvd. | Madison, WI  53719

P: 608.236.1175 | F: 608.238.2614  
fbetz@aeieng.com  |  www.aeieng.com  

 

 

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-- 
***************************
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
bradley@tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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