What type of compressor is characterized by the use of a rolling piston?

The correct choice is characterized by the use of a rolling piston, which is a key feature of rotary compressors. In rotary compressors, the piston rolls along the inner surface of a cylinder, effectively drawing in and compressing the refrigerant. This design allows for smoother operation and lower vibration compared to other compressor types. It typically provides continuous and efficient compression, making it ideal for various refrigeration and air conditioning applications.

A reciprocating compressor operates with a back-and-forth motion of the piston, which differs significantly from the rotary motion seen in rotary compressors. Centrifugal compressors, on the other hand, utilize a rotating impeller to move refrigerant through a series of stages to increase pressure, rather than a piston mechanism. Diaphragm compressors employ a flexible diaphragm to compress the refrigerant, which is a completely different approach than the rolling piston design. Understanding these different mechanisms helps to clarify why the rotary compressor is distinct in its operation and efficiency.