[TRNSYS-users] Type 155 Simulation Speed

[keilholz, werner]

Hi James, 

 

You could call that a communication bottle neck, but the slow speed mainly comes from the fact that MATLAB has to be called (and executed) during each iteration. This implies a huge overhead. 

 

An alternative is to compile your MATLAB model into an S-function and create a DLL that can be used like any TRNSYS type (adding the TRNSYS API to the generated source). I wrote a MATLAB real time workshop template for the MSVC C++ compiler to automize this from within MATLAB. For this to work, you need MATLAB real time workshop (expensive) / SIMULINK (expensive) and Microsoft Visual C++ 2003 or 2005 (cheap/free). 

 

Let me know if you want to try it out (it's a 'beta' ;-) ).

 

Werner

 

________________________________

De : James S. McNeill [mailto:James.Mcneill at Colorado.EDU] 
Envoyé : samedi 4 octobre 2008 01:35
À : trnsys-users at cae.wisc.edu
Objet : [TRNSYS-users] Type 155 Simulation Speed

 

I am currently using the Type 155 to find roots of several functions.  There are 18 inputs and 8 outputs connected to the Type 155.  The simulation requires almost 10 times longer to complete when I have this model attached.  Is there an communication bottleneck between Matlab and TRNSYS?  I am planning a large parametric study and need to find ways to speed up the simulation.

 

Thanks.

 

 

James McNeill

University of Colorado

Dept. of Civil, Env., and Architectural Engineering

Building Systems Program

 





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