Earlier quoted context omitted.
adsorption refrigeration has a really bad coefficient of performance, typically 0.3 to 0.7, while vapor compression systems get 3-5
Ah, I was always wondering why they weren't more commonly used, but that's a pretty horrible coefficient of performance. I guess it's really only worth it if you want no moving parts for quiet or maintenance-free operation?
I suppose if they can use waste heat they make sense.