Uses two spiral-shaped scrolls to compress the refrigerant (see Figures 9-3 and 9-4). One scroll remains stationary while the other orbits around it in a rotary motion. The moving scroll compresses the refrigerant by forcing it into an increasingly smaller space. At this point, the gas, now compressed to a high pressure, is discharged from a port in the stationary scroll to the condenser. Scroll compressors are quieter than piston compressors because they contain only one moving part.
