There are the links below

http://www.obitko.com/tutorials/genetic-algorithms/

http://www.geneticprogramming.com/ga/GAtutorials.html

http://www.ai-junkie.com/ga/intro/gat1.html

http://www.theprojectspot.com/tutorial-post/creating-a-genetic-algorithm-for-beginners/3

Dear Hema

On Sambasivarao's response, there is also a way of coupling TRNSYS and Matlab for genetic algorithm optimization in sustainable building design

http://info.tuwien.ac.at/bausim/conftool/jones-2010-coupling_trnsys_and_matlab_for_genetic_algorithm_optimization-125.pdf

Gerro