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Ebullition à l'intérieur d'un tube pendant l'écoulement du R407C et du mélange R407C-huile. 2. Résultats et prévisions avec le tube lisse.

In-tube flow boiling of R407C and R407C-oil mixtures. 2. Plain tube results and predictions.

Auteurs : ZÜRCHER O., THOME J. R., FAVRAT D.

Type d'article : Article

Résumé

In-tube evaporation tests for R407C and R407C/oil are reported for a plain copper tube. The tests were run at a nominal inlet pressure of 645 kilopascals at mass velocities of 100, 200 and 300 kg/(m2.s) over nearly the entire vapor quality range. Pure R407C performed very similarly to pure R134a run previously in similar tests, at all three mass velocities. At vapor qualities higher than 70%, the effect of oil was very dramatic, decreasing performance by as much as 80-90%, even with small amounts of oil. Two-phase pressure drops were increased by the presence of oil, especially at high vapor qualities. A new method for predicting local boiling coefficients of refrigerant-oil mixtures is presented.

Détails

  • Titre original : In-tube flow boiling of R407C and R407C-oil mixtures. 2. Plain tube results and predictions.
  • Identifiant de la fiche : 1999-3391
  • Langues : Anglais
  • Source : HVAC&R Research - vol. 4 - n. 4
  • Date d'édition : 10/1998
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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