Apologies if this is not the right forum for this question, I checked the Physics side and there's no questions on this, whereas there's at least one other question here about absorption refrigeration.
I have a very standard camping fridge which runs on the absorption cycle, I'm making a leap of informed guesswork and assuming it's ammonia + hydrogen based.
I'm investigating ways the efficiency or performance of the system could be improved without major surgery but I'm neither a chemist nor physicist (nor surgeon).
Here's the system as explained by the manufacturer:
And here's the actual unit, minus some lagging round the boiler:
So you can see it's pretty basic, they haven't changed the design in decades.
My main train of thought, based on the bleeding obvious, is that either more heat could be added at the boiler end, or more cooling (basically, a fan) could be added to the condenser.
However, I don't know enough about how the coolant behaves to know if this would be of any benefit - adding heat could just ruin everything, cooling beyond a certain point may make no difference, etc. etc.
Additionally, I don't know if things could be done at other points in the cycle (cooling or heating other areas such as the absorber being the obvious easy wins) to improve matters.
I would also like to add that this is mostly driven by my curiosity for tinkering with things, I realise that the real-world answer to a better fridge is to buy a compressor type one - but they're expensive (seriously, compressor camping fridges are more than a full-size household fridge+freezer) and I won't learn anything that way ;)