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A literature overview on flow boiling heat transfer of ammonia in horizontal and vertical tubes.

Number: pap. ID: 705

Author(s) : SPINDLER K.

Summary

Historically, ammonia has proved to be an excellent refrigerant with good thermodynamic and transport properties. Ammonia has been used as a refrigerant in large industrial applications for many years. There is a great interest in the use of ammonia in smaller systems. The accurate knowledge of the heat transfer behaviour in flow boiling and the influence of oil allow a more precise thermal design and optimization of evaporators. Finned tube heat exchangers with flow boiling inside smooth or microfin tubes are used for air heated evaporators. These evaporators are operated at low mass fluxes and low heat fluxes. An overview on the heat transfer behaviour of boiling ammonia under flow boiling conditions in horizontal and vertical tubes will be given. The influence of surface geometry (smooth, microfin) and oil will be discussed. Experimental results and prediction methods will be presented.

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Pages: 8 p.

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Details

  • Original title: A literature overview on flow boiling heat transfer of ammonia in horizontal and vertical tubes.
  • Record ID : 30001113
  • 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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