[TRNSYS-users] problem about the differential controller (Type2)

[yhang at purdue.edu]

Graham,
Thanks a lot.
I will read through this.
I am just wondering can this controller be used in TRNSYS?
Regards,
Yin

Quoting Graham Morrison <g.morrison at unsw.edu.au>:

> Yin
> 
> See
> http://users.tpg.com.au/t_design/PCL_Design/PCL_Design.htm
> 
> Graham Morrison
> 
> 
> At 01:07 AM 16/09/2009, Yin Hang wrote:
> >--===============0736645340==
> >Content-Language: en-us
> >
> >Hello,
> >Thanks for your replying.
> >I have connected connect the output of the controller to its
> >"input control function" (input 4).
> >But if you look at the example in TRNSYS - "DHSW", you will
> >also find this fluctuation problem.(suddenly on and suddenly
> >off, even still in the deadband).
> >Thanks.
> >Yin
> >
> >-----Original Message-----
> >From: Francois Badinier
> >[mailto:francois.badinier at icax.co.uk]
> >Sent: Tuesday, September 15, 2009 5:11 AM
> >To: 'Yin Hang'; trnsys-users at cae.wisc.edu
> >Subject: RE: [TRNSYS-users] problem about the differential
> >controller (Type2)
> >
> >Yin,
> >
> >Make sure you connect the output of the controller to its
> >"input control function" (input 4). You link the controller
> >with itself basically. This has to be done in order to get
> >the hysteresis effect working (influence of the previous
> >state).
> >With that done, it should work properly.
> >
> >Regards,
> >
> >François Badinier
> >Development Engineer
> >ICAX Ltd
> >1 Hatfield House
> >Baltic Street West
> >London EC1Y OST
> >francois.badinier at icax.co.uk
> >www.icax.co.uk
> >
> >
> >
> >
> >-----Original Message-----
> >From: Yin Hang [mailto:yhang at purdue.edu]
> >Sent: 14 September 2009 19:47
> >To: trnsys-users at cae.wisc.edu
> >Subject: [TRNSYS-users] problem about the differential
> >controller (Type2)
> >
> >Hello,
> >I have a problem when I use differential controller type2.
> >For example, I want to control my solar collector loop pump
> >by using one of this controller.
> >My control logic is when the outlet temperature of my solar
> >collector is higher than the inlet temperature of my solar
> >collector 4C, the pump will be on;
> >And when it is lower than the inlet temperature for 2C, the
> >pump will be off.
> >However, I found the output control signal is fluctuated,
> >such as it suddenly becomes off even the outlet temperature
> >is 2C higher than the outlet temperature; and next timestep,
> >it suddenly on.
> >Could you help me to fix this problem? I figure it is really
> >bad since it is un-normal for my pump during true situation.
> >Thanks.
> >
> >
> >
> >_______________________________________________
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> >TRNSYS-users at cae.wisc.edu
> >https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users
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> >05:59:00
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> >
> >
> >
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> >_______________________________________________
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> >
> >--===============0736645340==--
> 
> 
> Graham Morrison
> 
> Emeritus Professor of Mechanical Engineering
> School of Mechanical & Manufacturing Engineering
> The University of New South Wales
> Sydney Australia 2052
> 
> Phone  +61 (0) 2 9385 4127
> Mobile  +61 (0) 425 212 218
> Fax      +61 (0) 2 9663 1222
> 
> g.morrison at unsw.edu.au
> 
> Web sites
> 
> <http://www.mech.unsw.edu.au/content/staff/morrison.cfm?
ss=4>G.<http://www.mech.unsw.edu.au/content/labs_computing/Solar_Thermal.cfm?
ss=5>Morrison
> 
> Solar Thermal Energy Laboratory at 
> <http://www.mech.unsw.edu.au/content/labs_computing/Solar_Thermal.cfm?
ss=5>UNSW
> 
> <http://solar1.mech.unsw.edu.au/>Solar thermal technology
> 
> 


Yin(Kathy) Hang
_______________________________

Graduate Student
Architectural Engineering
Civil Engineering Department
Purdue University
_______________________________

Office No.: Civil 4119
Office phone: (765)-494-6696
Email: yhang at purdue.edu