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R744 : rejet de chaleur à proximité du point critique.

Heat rejection from R744 near the critical point.

Numéro : pap. n. R27, 2424

Auteurs : KONDOU C., HRNJAK P.

Résumé

The paper presents experimental results of the study of heat rejection from CO2 near the critical pressure: above it and below it, both in superheated and in two phase zone. The experimental data on HTC (heat transfer coefficient) and pressure drop in a horizontal smooth tube of inner diameter 6.1 mm at the pressure 5 to 7.5 MPa, enthalpy 280 to 450 kJ*kg-1, mass flux 100 to 250 kg*m-2*s-1, and heat flux 3 to 30 kW*m-2 are provided. Experimental results are compared with correlations proposed for CO2 when available and for other refrigerants. In the results, the occurrence of condensation in superheat zone was indicated from the experimental HTC much higher than correlation proposed for single phase turbulent HTC and tube wall temperature below the saturation temperature.

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Pages : 9p.

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  • Prix public

    20 €

  • Prix membre*

    15 €

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Détails

  • Titre original : Heat rejection from R744 near the critical point.
  • Identifiant de la fiche : 30000999
  • Langues : Anglais
  • Source : 2010 Purdue Conferences. 13th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 12/2010

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