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Numerical investigation of two-phase ejector liquid recirculation cycles with natural refrigerants.

Number: pap. ID52

Author(s) : LAWRENCE N., ELBEL S.

Summary

Liquid recirculation is a method of improving evaporator performance by feeding excess liquid through the evaporator. Recirculation cycles often use mechanically-driven pumps to force liquid through the evaporator; however, it may be more convenient, especially for small-scale systems, if an ejector driven by the recovery of expansion power were used to provide this recirculation effect. Numerical models of a conventional liquid recirculation cycle with a mechanically-driven pump and two different recirculation cycles in which the pumping is provided by an ejector were developed. The performance of the three recirculation cycles is compared for the natural refrigerants CO2, propane, and ammonia. The results show that fluids that can recover a large amount of power in the ejector relative to other fluids, such as CO2, should use the ejector to increase compressor suction pressure, while fluids that cannot recover as much power in the ejector, such as ammonia, should use the ejector to provide liquid recirculation.

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Pages: 8 p.

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Details

  • Original title: Numerical investigation of two-phase ejector liquid recirculation cycles with natural refrigerants.
  • Record ID : 30012270
  • Languages: English
  • Source: 11th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2014). Proceedings. Hangzhou, China, August 31-September 2, 2014.
  • Publication date: 2014/08/02

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