[TRNSYS-users] GenOpt: Identifing equality constraints for independent variables (x*y*z=1000)

[Michaël Kummert]

This may not be the most elegant solution, but you can take equality
constraints into account by adding a penalty to your cost function if they
are not met (e.g. cost = “real cost” + 1e6*(1000-x*y*z)^2).

 

In this particular case, I would suggest a simpler way which is to let x and
y be the parameters that vary (independent variables) and define z as a
derived (dependent) variable with z = 1000/(x*y).

 

I hope this helps.

 

Michaël Kummert, Polytechnique Montréal

 

From: trnsys-users-bounces at cae.wisc.edu
[mailto:trnsys-users-bounces at cae.wisc.edu] On Behalf Of Safizadeh
Mohammadreza
Sent: Friday, May 23, 2014 06:48
To: trnsys-users at cae.wisc.edu
Cc: Safizadeh Mohammadreza
Subject: [TRNSYS-users] GenOpt: Identifing equality constraints for
independent variables (x*y*z=1000)

 

Dear Trnsys users,

 

For running my optimization (GenOpt + Trnsys), I need to define two types of
following constraints for independent variables to be optimized:

 

Variables to be optimized are: x, y and z

Constraints:

1-      Boundary constraints: 0<x<20, 0<y<20, 0<z<20

2-      Equality constraints: x*y*z=1000

 

To this end, I could make the boundary constraints in command file but I
could not find a solution to define equality constraints.

 

I would appreciate if you could let me know how I can define equality
constraints within GenOpt or Trnsys.

 

Best regards,

Reza Safi

_____________________________________________

Division Thermal Systems and Buildings

Fraunhofer-Institut für Solare Energiesysteme ISE

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