Share

IIR document

Flow boiling heat transfer, pressure drop, and flow pattern for CO2 and R-410A at low temperatures.

Author(s) : PARK C. Y., HRNJAK P. S.

Summary

CO2, R410A, and R22 flow boiling heat transfer coefficient, pressure drop, and flow pattern are investigated in the horizontal smooth tube of 6.1-mm inner diameter. Flow boiling heat transfer coefficients are measured at the constant wall temperature conditions, while pressure drop measurement and flow visualization are carried out at adiabatic conditions. This experimental study is performed at evaporation temperatures of -15 and -30°C, mass flux from 100 to 400 kg/m2.s, and heat flux from 5 to 15 kW m-2 for vapour qualities ranging from 0.1 to 0.8. The comparison of heat transfer coefficients for CO2, R-410A, and R-22 is presented at various heat fluxes, mass fluxes, and evaporation temperatures. The difference of coefficients for each refrigerant is explained with the Gungor and Winterton (1986) correlation based on the thermophysical properties of refrigerants. Pressure drop for CO2, R-410A, and R-22 at various mass fluxes, evaporation temperatures and qualities is presented in this paper. From the comparison of the predicted and measured values, several correlations are proposed to predict CO2 and R-410A flow boiling heat transfer and pressure drop. The observed two-phase flow patterns for CO2 and R-410A are presented and compared with flow pattern maps. Most of the flow patterns can be determined by the Weisman et al. (1979) flow pattern map.

Available documents

Format PDF

Pages: ICR07-B1-1636

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: Flow boiling heat transfer, pressure drop, and flow pattern for CO2 and R-410A at low temperatures.
  • Record ID : 2007-2479
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

Links


See other articles from the proceedings (839)
See the conference proceedings

Indexing