Why aircraft refrigeration uses a centrifugal compressor in place of reciprocating compressor and a gas turbine in place of reciprocating expander?
I expect it is the capacity , large building AC units are also radial or axial ; smaller units are recips. And as commented , likely there is a weight advantage. I put this question in the Aviation stack .My summation of the general answer is most aircraft AC is supplied by high pressure bleeds from the main engines not conventional AC compressors. The APU powers a conventional radial AC when on the ground, and the main engines are not providing AC.