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

Author(s) : ZÜRCHER O., THOME J. R., FAVRAT D.

Type of article: Article

Summary

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.

Details

  • Original title: In-tube flow boiling of R407C and R407C-oil mixtures. 2. Plain tube results and predictions.
  • Record ID : 1999-3391
  • Languages: English
  • Source: HVAC&R Research - vol. 4 - n. 4
  • Publication date: 1998/10
  • Document available for consultation in the library of the IIR headquarters only.

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