[TRNSYS-users] Raising flags
Stefan de Kool
S.deKool at chri.nl
Thu Oct 25 00:42:55 PDT 2007
Dear Karl,
Thanks for the idea. The problem is though that as soon as Tin gets less
than Tset again, it 'looses' its value. What i want is to keep it at Tset
untill another condition is met, but not when Tin<Tset. In fact i want to
include some form of hysteresis in a control loop.
(PS: you can use GE instead of combining GT and EQL)
Kind regards
Stefan
_____
Van: Karl Vonderputten [mailto:karl at chromagen.com.au]
Verzonden: woensdag 24 oktober 2007 23:27
Aan: Stefan de Kool
Onderwerp: RE: [TRNSYS-users] Raising flags
Hello Mr De kool
You could try the following to raise a flag
Eqns 3
Tset = 60 ! Tset whatever set point
Tin = [9,6] ! Whatever output from whatever control card
Tout = Tset*GT(Tin, Tset)+ Tset*EQL(Tin, Tset) + Tin * LT( Tin, Tset)
I included the expression in the middle because I was not sure what the
equation would do if the
Value Tin was ever exactly equal to Tset. It may not be necessary
Please let me know if this was helpful
(I may like to use it later myself)
Regards
Karl Von Der Putten
From: Stefan de Kool [mailto:S.deKool at chri.nl]
Sent: Thursday, 25 October 2007 1:03 AM
To: trnsys-users at engr.wisc.edu
Subject: [TRNSYS-users] Raising flags
Dear all,
Does anyone know if there is a way to 'raise flags' in trnsys? I want to
give a certain variable a value at the moment a certain temperature is
reached and to keep that variable at that value regardless of further
temperature changes.
Regards,
Stefan de Kool
Cauberg-Huygen Raadgevende Ingenieurs B.V.
Bezoekadres: Boterdiep 48, 3077 AW ROTTERDAM
Postadres: Postbus 9222, 3007 AE ROTTERDAM
Telefoon: +31 (0)10-2443638
Fax: +31 (0)10-425 44 43
http://www.chri.nl
E-mail: s.dekool at chri.nl
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