Re: [TRNSYS-users] if-elseif statement in TRNSYS

[Miroslava Kavgic <miroslava.kavgic@gmail.com>]

Hi Raksit,

yes, by using an equation editor in the simulation studio. IF-THEN-ELSE can be described using GT (greater than), LT (less than), EQ (equal to), OR, and NOT.

As Mr. Michaël Kummert wrote:
'For example, let's assume you would like to use the following "if-then-else"
statement:

if (Z>0) then
X=Y1
else
X=Y2
endif
The following equation will do the same:

X=GT(Z,0)*Y1+(1-GT(Z,0))*Y2

Please refer to the TRNSYS manual (p 2-8) for a description of available functions. 
Please also note that if-then-else tests can lead to oscillations due to the
iterative nature of TRNSYS. E.g. you could implement a controller similar to
Type 2 with equations. However, you have no way to tell TRNSYS to stop
changing a variable if the number of iterations is beyond a certain value
(which Type 2 does with the NSTICK parameter).'

Regards,

Miroslava

On 28 February 2013 00:31, leen peeters <l.f.r.peeters@gmail.com> wrote:
> Raksit,
>  
> you can 'translate it'...
> say
> if A=1 then B else C
>  
> you can make it
> (eql(A,1)*B)+(not(eql(A,1)*C)
>  
> Leen
>
>
> On Thu, Feb 28, 2013 at 12:20 AM, Raksit Pattanapitoon <rp327@cornell.edu>
> wrote:
>>
>> Dear all,
>>
>> Does anyone know if there's TRNSYS component that can implement the
>> if-elseif statements? Any direction would be helpful. Thank you in advance!
>>
>> Best,
>> Raksit
>>
>> --
>> Raksit Pattanapitoon
>> Cornell University Mechanical Engineering
>> B.S. 2012, M.Eng. 2013
>>
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>
>
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--
Miroslava Kavgic Dipling, MSc
PhD Candidate
 
Bartlett School of Graduate Studies
University College London (UCL)
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E-mail:miroslava.kavgic@gmail.com