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Combined effects of fluid selection and flow condensation on ejector operation in an ejector-based chiller.

Author(s) : LITTLE A. B., GARIMELLA S., DIPRETE J. P.

Type of article: Article, IJR article

Summary

This work investigates the optimization of the coefficient of performance of an ejector-based chiller through changes in the two-phase flow characteristics inside the ejector using wet R134a and dry R245fa fluids. Reducing the superheat at the motive nozzle inlet results in a 12–13% increase in COP with a 14–16?K drop in driving waste heat temperature. The roles of momentum transfer, heat transfer, and two-phase flow on performance are delineated. The change in COP appears to be a combination of the choice of fluid and the effect of phase change on momentum transfer effectiveness. Larger degrees of condensation reduce momentum transfer effectiveness; however, energy savings from reduced motive superheating compensates for the effect of condensation, and causes a net increase in COP. It is recommended that ejector-based chillers be operated such that the motive nozzle inlet is near saturation, and dry fluids like R245fa are used to improve performance.

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Pages: 1-16

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Details

  • Original title: Combined effects of fluid selection and flow condensation on ejector operation in an ejector-based chiller.
  • Record ID : 30018386
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 69
  • Publication date: 2016/09

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