Share

IIR document

Measurement of spray boiling refrigerant coefficients in an integral-fin tube bundle segment simulating a full bundle.

Author(s) : TATARA R. A., PAYVAR P.

Type of article: Article, IJR article

Summary

Outside (refrigerant) boiling coefficients for a combination of spray and drip boiling for a low pressure refrigerant have been obtained from overall heat transfer coefficients in a 1024 fins per meter tube bundle segment. The tubes were heated by water on the inside; liquid refrigerant was sprayed and/or dripped on the outside. Also, refrigerant vapour was supplied at the bottom of the bundle segment. This configuration simulates an actual flooded evaporator under spray boiling conditions. The dripping corresponds to liquid film falling from upper rows while the inlet vapour is equivalent to the vaporized refrigerant rising from lower tubes; the refrigerant vapour can influence heat transfer performance by the combined effects of gas convection and liquid shear on the tubes. For a nominal heat flux of 23,975 W/m2, a bundle average outside heat transfer coefficient of 8522 W/m2.°C, based on nominal tube outer diameter, was found at an average bundle vapour mass flux equal to 12.4 kg/s.m2. The distributor plate below the bundle enhanced the heat transfer, especially at lower vapour mass fluxes, by providing a level of liquid hold-up just below the bottom tube row.

Available documents

Format PDF

Pages: 744-754

Available

  • Public price

    20 €

  • Member price*

    Free

* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).

Details

  • Original title: Measurement of spray boiling refrigerant coefficients in an integral-fin tube bundle segment simulating a full bundle.
  • Record ID : 2002-1265
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 24 - n. 8
  • Publication date: 2001/12

Links


See other articles in this issue (8)
See the source

Indexing