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IIR document

Variable capacity operation of a vapor ejector equipped with an adjustable needle.

Number: pap. n. 1105

Author(s) : POIRIER M., REDDICK C., SAPOUNDJIEV H.

Summary

Vapor ejector technology compresses gas using thermal rather than mechanical or electrical energy. For a given motive pressure, ejector capacity is constant; it is a direct function of the motive nozzle throat area. When the available thermal motive power is changed, an adjustable needle could move within the motive nozzle, varying the throat area. A steam activated vapor ejector test bench was used to investigate this design strategy. First, tests were completed with two constant area motive nozzles having throat areas of 12.8 mm2 and 20.3 mm2. Then, a needle-equipped motive nozzle, having a maximum throat area of 20.1 mm2, was evaluated over approximately the same throat area range. Experimentally evaluated ejector performance was similar for both the needle-equipped and the constant area nozzles, for moderate throat area reduction. However, for throat area reductions greater than 24%, the needle-equipped ejector showed a performance penalty compared to the constant area ejector.

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Pages: 8

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Details

  • Original title: Variable capacity operation of a vapor ejector equipped with an adjustable needle.
  • Record ID : 30026697
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.1105
  • Notes:

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