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Which of the following is not positive displacement type compressor?

Which of the following is not positive displacement type compressor? Correct Answer Centrifugal compressor

Compressors are classified in two categories based on working principle:

Positive displacement type: In positive displacement type compressors, compression is achieved by trapping a refrigerant vapour into an enclosed space and then reducing its volume. Since a fixed amount of refrigerant is trapped each time, its pressure rises as its volume is reduced. When the pressure rises to a level that is slightly higher than the condensing pressure, then it is expelled from the enclosed space and a fresh charge of low-pressure refrigerant is drawn in and the cycle continues. Example:

  • Reciprocating type
  • Rotary type with sliding vanes (rolling piston type or multiple vane type)
  • Rotary screw type (single screw or twin-screw type)
  • Orbital compressors
  • Acoustic compressors

Roto-dynamic type (Non-positive displacement type): The elevation of the pressure of the refrigerant vapour is by centrifugal force. In roto-dynamic compressors, the pressure rise of refrigerant is achieved by imparting kinetic energy to a steadily flowing stream of refrigerant by a rotating mechanical element and then converting into pressure as the refrigerant flows through a diverging passage. Example:

  • Radial flow type (Centrifugal Compressor)
  • Axial flow type

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