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Experimental evaluation of internal condensation of refrigerants R12 and R134a.

Author(s) : DOBSON M. K., CHATO J. C., HINDE D. K., WANG S. P.

Summary

Experimental and analytical work has been performed on local heat transfer for in-tube condensation of pure R12 and R134a. The data were taken in a 4.57-mm internal diameter smooth copper tube of 2.90 m length. Test apparatus is described. Data were taken with test conditions in the following ranges: mass flux, 75 to 500 kg/m2.s; saturation temperature, 35 and 60 deg C; average quality, 10 to 90%; and heat flux, 4 to 15 kilowatts/m2. Different flow regimes were observed. The data for pure refrigerants in the wavy flow regime were successfully correlated with a modified Nusselt-type approach and exhibited no mass flux dependence. The annular flow data were successfully correlated based on an analogy between heat and momentum transfer.

Details

  • Original title: Experimental evaluation of internal condensation of refrigerants R12 and R134a.
  • Record ID : 1994-3430
  • Languages: English
  • Source: ASHRAE Transactions 1994.
  • Publication date: 1994
  • Document available for consultation in the library of the IIR headquarters only.

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