for all engineers, i am working as mechanical and technical support engineer in an agency for absorption chillers.
i am totally resposnsible for micro absorption chiller which could be generated using solar system.
let me know please if you need any question about this subject.

Thanks Eng.Mohamed for opening this subject, and i have a little information that the NH3 has a lot of bad effects on the enviroment, that's why it is developed the LIBR which could conserve energy and save power.