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Flow boiling of R1234yf in a 1 mm diameter channel.

Number: pap. ID: 588

Author(s) : DEL COL D., BORTOLIN S., TORRESIN D., et al.

Summary

While HFC refrigerants have no ozone depletion potential, many of them have relatively large values of global warming potentials. Recently, development efforts have been initiated to investigate halogenated olefins as possible refrigerants, with fluorinated propene isomers, in particular, having emerged as possible solutions. Specifically, R1234yf, has emerged as R134a replacement for automotive applications. While much development work has been performed regarding these fluorinated propene isomers and their applications, very few data on vaporisation heat transfer has been published so far in the open literature. In this paper, the local heat transfer coefficient measured during flow boiling of R1234yf in a 1 mm diameter circular minichannel is reported and compared to data for R134a. During flow boiling tests, the heat is provided to the boiling fluid by using hot water as a secondary fluid. Therefore the heat flux is not imposed but instead it is the result of the inlet temperatures of the two fluids and the thermal resistances on the two sides, as it occurs in actual heat exchangers for automotive and air-conditioning applications. Flow boiling tests are carried out at mass fluxes ranging between 200 and 600 kg/m2.s.

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Pages: 8 p.

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Details

  • Original title: Flow boiling of R1234yf in a 1 mm diameter channel.
  • Record ID : 30002204
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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