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    Ghosh, Vikram Anantheswaran, Ramaswamy C. and Floros, John D. 2010. Encyclopedia of Agricultural, Food, and Biological Engineering, Second Edition.


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CFC Alternatives — A Fresh Look

  • Kandadai Srinivasan (a1)
  • DOI: http://dx.doi.org/10.1017/S0376892900031465
  • Published online: 01 August 2009
Abstract

This article examines, through a molecular perspective, the ‘ozone-friendly’ refrigerants R-134a and R-123 vis-à-vis R-12 and R-11, which are targeted to be phased out under the Montreal Protocol on Substances that Deplete the Ozone Layer, Final Act (1987). It appears that the molecular weight, size parameter, and dipole moment, of R-134a and R-123, may induce a pronounced effect on the chemical equilibrium of ice particles in the polar stratospheric clouds and subsequently influence the photochemical reactions therein.

Non-polar, high-molecular-weight perfluoropropane (R-218), could be a better substitute for R-12, while R-134, which is a non-polar HFC of the ethane family, could also be a candidate although its molecular weight is lower than that of R-12. The search for a good substitute for R-11, however, must continue.

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This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

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M.J. Molina & F.S. Rowland (1974). Stratospheric sink for chlorofluoromethanes: Chlorine atom catalysed destruction of ozone. Nature (London), 249, pp. 810–2, illustr.

R.L. Shank (1967). Thermodynamic properties of 1, 1, 1, 2, 2-pentafluoropropane (Refrigerant 245). J. Chem. Eng. Data, 12, pp. 474–80, illustr.

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K. Srinivasan & M.V. Krishna Murthy (1985). Corresponding states treatment of refrigerants and cryogenic liquids. Int. J. Refrig., 8, pp. 143–6, illustr.

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Environmental Conservation
  • ISSN: 0376-8929
  • EISSN: 1469-4387
  • URL: /core/journals/environmental-conservation
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