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Re: [TRNSYS-users] Parameter identification.

Didier,
  We do this quite often using the GenOpt/TRNSYS coupling called TRNOpt (the TESS Optimization Library) for parameters that are not contained in the *.b17. What we typically do is use a Type9 to read the measured inlet and outlet conditions. The measured inlet conditions are used as the driving force for other TRNSYS models (flow rates, temperatures, etc.). The ojective function is as you suggest; the difference between the the simulated and measured results. Sometimes we use a function that only looks at the difference when the system is on (pumps are active). Sometimes, we define the objective function so that the difference between integrated results is minimized. It is also very important to keep the parameter identification as simple as possible by looking at individual pieces of a system (such as identifying the best fit heat exchanger effectiveness) and then building the whole system model from the calibrated pieces. If the parameter identification is being done on too complicated a system then there are often too many variables that affect the performance.
Kind regards,
 David


On 6/26/2013 03:42, Gossard, Didier wrote:

Hello,

 

I want to find parameter values (like interior/exterior convective coefficients, thermal conductivities for instance) that make the model calculated by TRNSYS (actually a multizonal building with Type 56) most closely to measured data. This is the well-known problem called “parameter identification”.

Does someone know tools developed under TRNSYS environment (a type ?)that can perform parameter identification ?

Initially, I wanted to do it by coupling GenOpt and TRNSYS, but it is a tough solution (particularly, defining the objective function based on the difference between model results and measured data to minimize is difficult).

 

Best regards,

Didier GOSSARD.



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