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Simulation of flow patterns and evaporation in horizontal flattened tubes.

Author(s) : THOME J. R., HAJAL J. el

Summary

Flattened tubes are an interesting alternative to round tubes as they greatly reduce the refrigerant charge in direct-expansion evaporators and provide for a more compact heat exchanger design. Flattened tubes refer to plain round tubes that have been rolled (or extruded) flat on top and bottom and remain round at the two ends. Compared at the same mass flow rate, heat transfer coefficients in a flattened tube are about 100 to 150% higher than those for the corresponding round tube at nearly all vapour qualities, but it is also predicted to have a much larger two-phase pressure drop.

Details

  • Original title: Simulation of flow patterns and evaporation in horizontal flattened tubes.
  • Record ID : 2004-0122
  • Languages: English
  • Source: ASHRAE Transactions. 2002 annual Meeting, Honolulu, Hawaii. Volume 108, part 2 + CD-ROM.
  • Publication date: 2002

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