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Preliminary study of saturated water (R-718) film boiling in a grooved plate evaporator.

Number: 0621

Author(s) : GIRAUD F., COLLIGNON R., MAREK J., STUTZ B.

Summary

Since it is a natural and ecological fluid with high latent heat of vaporization and high heat capacity, water (R-718) could be a good candidate to develop durable solution and replace non-environmentally friendly fluids currently used as refrigerant. However, due to several drawbacks, like the high wall superheat required to onset the boiling in these systems, evaporators currently used in water systems are mainly of falling film type. In order to allow compact design of these latter, a grooved plate falling film heat exchanger has been tested. To take advantage of boiling events observed and allow a deeper understanding of this phenomenon, a preliminary study is conducted. Boiling events observed in a saturated liquid film and in working conditions representative to those obtained in water refrigeration systems are identified and characterized using high speed imaging. The bubbles flow velocities are estimated and phenomena observed discussed.

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Pages: 9 p.

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Details

  • Original title: Preliminary study of saturated water (R-718) film boiling in a grooved plate evaporator.
  • Record ID : 30031640
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0621

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