I've read that the role generators play in the absorption chiller cycle is to concentrate the salt solution so that the evaporator/absorber can maintain a vacuum by constant absorption of vapour entering from the evaporator. Now considering the vacuum conditions, water could boil at 3°C, which can easily serve our purpose of concentrating the salt solution.
Why then, do we have to use temperatures of around 80°C? How does a higher generator temperature affect the cycle, provided all other factors remain constant? And why does too high a generator temperature become dangerous/inefficient?
Also, if possible, explain the relationship between the gas and liquid phases of water at the generator and condenser, because I believe that the more you evaporate water off, the higher the head pressure becomes, and thus raises the boiling point as the salt solution becomes concentrated.
I love diagrams. So if one of you could provide one to visually explain the concept, I'd be grateful.