Re: [TRNSYS-users] Temperature control

[Adrien JEZEQUEL <a.jezequel@itf.biz>]

Dear Abdullahi,

You may use equation window with conditions tools ans comparaision tools 
like LT (Lesser Than), GT (Greatter Than), EQ(Equal), LE(Lesser and 
Equal), GE(Greatter ans Equal)
   LT(a,b) returns 1 if a<b
   GT(a,b) returns 1 if a>b
   LE(a,b) returns 1 if a<=b
   GE(a,b) returns 1 if a>=b
   EQ(a,b) returns 1 if a=b

So you may try to use equations like:
   Condition1 = AND(GT(TAmb,16),LT(TAmb,30))    => =1 if 16<TAmb<30
   Condition2 = AND(GT(TAmb,-10),LT(TAmb,-5))   => = 1 if -10<TAmb<-5
   Condition3 = AND(NOT(Condition1),NOT(Condition2)) (or 
AND(GE(TAmb,-5),LE(TAmb,16)))  => = 1 if  -5=<TAmb<=16

   Flow_Rate =  Condition1*Value1 + Condition2*Value2 + Condition3*Value3

Best regards, Adrien

aa1@brighton.ac.uk a écrit :
> Dear all,
>
>  
>
> I am trying to control a ventilation system using the inlet 
> temperature (in this case ambient air temperature) into the system. 
> For example the volumetric flow rate should be set to zero or certain 
> value if the temperature remains within a range of values (16-30 ºC 
> and -10-5 ºC). I will appreciate any ideas on how to achieve this.
>
>  
>
> Thank you.
>
> Abdullahi
>
>  
>
> Abdullahi Ahmed (BSc. MSc.) Postgraduate researcher
>
> School of the Environment
>
> University of Brighton
>
> Cockcroft Building
>
> Lewes Rd.
>
> Brighton
>
> BN2 4GJ
>
>  
>
> Tel: +44 01273 643455
>
>  
>
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--

***************************************************************
Adrien JEZEQUEL	
Ingénieur en Simulations Dynamiques
ITF (Ingénierie Tous Fluides)
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73230 ST ALBAN EN LEYSSE
FRANCE
Tel: 04.79.75.00.29
Website: www.itf.biz
Mail : a.jezequel@itf.biz