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Heat transfer and pressure drop for in-tube evaporation of CO2.

Author(s) : BREDESEN A. M., HAFNER A., PETTERSEN J., NEKSA P., AFLEKT K.

Summary

Because of the high pressure in CO2 refrigerating plants, correlations for smaller diameters than the ordinary are especially needed. A new test rig with a 7 millimeter diameter aluminium tube test section has been constructed to measure local heat transfer and pressure drop coefficients. The first experiments have been carried out with lubricant-free CO2 at mass fluxes between 200 and 400 kg/m2.s, heat fluxes between 3000 and 9000 watts/m2 and with evaporation temperatures from -25 to +5 deg C. Results are given.

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Pages: 1997-5

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Details

  • Original title: Heat transfer and pressure drop for in-tube evaporation of CO2.
  • Record ID : 1998-2782
  • Languages: English
  • Source: Heat transfer issues in "natural" refrigerants. International conference.
  • Publication date: 1997/11/06

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