centrifugal vs screw compressors

[techwombat]

Hi,

I've to evaluate the beahviour of centrifugal and screw compressors at partial load to decide wether is possible to use the screw ones insetad of the commonly used centrifugal at the high capacities and in air conditioning.
Can anybody provide me some tips or some refrence where I can find a comparison between them?

Thank's a lot