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Re: [TRNSYS-users] Simplified heating and cooling based onoperativetemperature

Title: [TRNSYS-users] Simplified heating and cooling based on operativetemperature
Hello Ms. Jansen and Mr. Sourbron!
 
I also think the solution has to be outside Type56.
 
If You use an iterative-feedback-controller (Type22) instead of Type2 and feed the operative temperature in as "controlled variable", define Your Setpoint and give the output of the controller as Gain in the thermal zone You should be able to avoid the hysteresis-effect occoring when using Type2. (You can also set a maximum output/heating power).
 
Using Type2 a bigger Deadband or a shorter timestep my also solve the problem.
 
With kind regards,
    Matthias Kersken
 

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Dipl.-Ing. Matthias Kersken
Wissenschaftlicher Mitarbeiter / Abteilung Energiesysteme

Fraunhofer-Institut für Bauphysik
Institutsteil Holzkirchen

Fraunhoferstraße 10
83626 Valley

eMail: Matthias.Kersken@ibp.fraunhofer.de
Telefon 08024 / 643-204
Telefax 08024 / 643-366
www.ibp.fraunhofer.de

Dipl.-Ing. Matthias Kersken
Research Associate / Department Energy Systems

Fraunhofer Institute for Building Physics
Branch Holzkirchen

Fraunhoferstraße 10
D-83626 Valley

eMail: Matthias.Kersken@ibp.fraunhofer.de
Phone +49 8024 / 643-204
Fax +49 8024 / 643-366
www.ibp.fraunhofer.de

 

 

 

 

 

 

 

 

 

 

 

 

 

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Von: Sabine Jansen - BK [mailto:S.C.Jansen@tudelft.nl]
Gesendet: Donnerstag, 18. Februar 2010 14:51
An: Maarten Sourbron; trnsys-users@cae.wisc.edu
Betreff: Re: [TRNSYS-users] Simplified heating and cooling based onoperativetemperature

Dear all,
 
I am also interensted in that question.
 
The only way I know now how to solve this is by using a type (controller, type 2 or thermostat, type 8) outside type 56. The the operative zone temperature must be connected to this type (e.g. 2b and creating a schedule elsewhere, in an equation solver), and the heating must be defined as a limited power connected to an input, which is then the output of the control type (type 2 or type 8).
 
One problem with this approach is that I cannot use a very large heating power anymore, since that causes the controller to switch on and off. Thus the heating power must be determined using the ideal heating, based on air temperature, first.
 
If there is an easier way, I am also very happy.
 
 
Kind regards,
 
Sabine Jansen

Van: Maarten Sourbron [mailto:Maarten.Sourbron@mech.kuleuven.be]
Verzonden: do 18-2-2010 13:53
Aan: trnsys-users@cae.wisc.edu
Onderwerp: [TRNSYS-users] Simplified heating and cooling based on operativetemperature

Dear all,

The simplified heating and cooling in Trnbuild is now comparing the zone
AIR temperature with the given set points.  Is there a way to change
this (or another controller model) to have the zone OPERATIVE
temperature compared with the set points?

Kind regards,

Maarten Sourbron

--
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Katholieke Universiteit Leuven
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T : 0032 (0)16 32 28 73
F : 0032 (0)16 32 29 85
E : Maarten.Sourbron@mech.kuleuven.be

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