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Which of the following is a non-positive displacement type of compressor?

Which of the following is a non-positive displacement type of compressor? Correct Answer Axial flow compressor

Explanation:

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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