Share

Flow boiling of R-22, R-134a and CO2 in horizontal evaporator with minichannels. 2. Two-phase flow boiling heat transfer.

Author(s) : CHOI K. I., PAMITRAN A. S., OH J. T., et al.

Summary

Convective boiling heat transfer experiments were performed in horizontal minichannels with R-22, R-134a and CO2. The test section is made of stainless steel tubes with inner diameters of 1.5 and 3.0 mm and with length of 2 m. It is uniformly heated by applying electric current directly to the tubes. Local heat transfer coefficients were obtained for heat flux ranges from 10 to 40 kW/m2, mass flux ranges from 200 to 600 kg/m2.s, quality ranges of up to 0.9, and the inlet temperature of 10°C. Laminar flow appears in the flow with minichannels. The experimental results were compared against six existing two-phase heat transfer coefficient correlations. A new boiling heat transfer coefficient correlation based on the superposition model for refrigerants has been developed with 11.74% mean deviation and -2.38% average deviation. See also the Bulletin of the IIR, reference 2007-0524.

Details

  • Original title: Flow boiling of R-22, R-134a and CO2 in horizontal evaporator with minichannels. 2. Two-phase flow boiling heat transfer.
  • Record ID : 2007-1030
  • Languages: English
  • Source: ACRA-2006. Proceedings of the 3rd Asian conference on refrigeration and air conditioning.
  • Publication date: 2006/05/21

Links


See other articles from the proceedings (161)
See the conference proceedings

Indexing