Thanks for answering.
Indeed! It seems quite complex for a simple demonstration.
Let's remove the idea of synthesis of glucose.
Do you have any idea about a reversible chemical reaction, easy to implement and activated mainly by means of heat?
But the main concept of the demonstration is to be able to take energy from the heat and store this energy with the chemical reaction, and then extract it partially when the reaction is reversed.
I was thinking to sugar because it is the way in which our body takes energy, but maybe there are simpler ways.
It would be really nice if someone could give me a very simple idea.
Thanks a lot,