Hi, you should better switch to MATLAB for solving multi-objective optimization problems:

https://fr.mathworks.com/discovery/multiobjective-optimization.html

Dear Richard 

That is right but due to thermodynamic functions in EES I need to perform it in EES.

Hi, in this case you can perhaps first combine the two criteria in one by using weights and minimize this new criterion.

Hi, can you tell me more about weights and this method please?

Hi, for this kind of approach called scalarization you can refer to:

https://en.wikipedia.org/wiki/Multi-objective_optimization

https://ocw.mit.edu/courses/engineering-systems-division/esd-77-multidisciplinary-system-design-optimization-spring-2010/lecture-notes/MITESD_77S10_lec14.pdf

Many thanks dear Richard 

Hi Mr. Pooria,

I'm also want to perform a multi-objective optimization in EES. did you get the way?

Hi Mr.Behnam

if you get any way to do optimization in EES , please share with us.

thank you alot.

Hi Dear Ali,

Yes, I found some great points regarding optimization in EES. As you may now, EES is equipped with single-objective optimization functions. However, there is no function for performing multi-objective optimizations. The best method which seems to me useful and also straightforward is "weight approach". you can find more information in:

Zare, V., SM Seyed Mahmoudi, M. Yari, and Majid Amidpour. "Thermoeconomic analysis and optimization of an ammonia–water power/cooling cogeneration cycle." Energy 47, no. 1 (2012): 271-283.

I hope this helps

Best regards

Pooria

Multi-objective optimization and linking matlab and EES for various optimization methods is not problem anymore. I used DDE to link EES and matlab and it worked well. I tried different optimization methods such as GA, PSO , ... for a simple Brayton Cycle optimization. https://www.kelaas.com/035

Dear Pooria

Could you please explain the methodology you used to perform the multi-objective optimization for cost and efficiency in EES using the "weight approach"? (@to Pooria)

"For example, when aiming to minimize the LCOE and maximize the capacity factor of a solar plant by considering several independent factors such as solar multiple, PV, RH, and so on, how can this approach be utilized?"

How to obtain the weighting coefficients in this approach?

Best regards

Iman

Sorry Pooria and Iman

No one answered the question?

I think EES doesn't have multi-objective but Matlab has.

I asked a question two days ago but this means I don't have to wait for an answer!!!!!

Dear Pooria,

As Mr. El-Awad mentioned, multi-objective optimization is not directly supported in EES. However, it is possible to evaluate the system based on each parameter of interest and then assign weights to them. If you wish to calculate all objectives simultaneously, you should consider using Matlab. There are two approaches to achieve this: