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IIR documentSummary
With the commissioning of large production plants around the world HFC 134a is now replacing CFC 12 in major refrigerant and air conditioning applications. But what will follow it? Various blends based on HFC 32, HFC 125, HFC 143a and 134a are already being supplied as replacements for HCFC 22 and R502. In contrast to the CFC and HCFC refrigerants some compositions are zeotropes showing modest temperature glides in condensers and evaporators. Initial misgivings about possible differential leakage and poor heat transfer with zeotropes appear to be unfounded in practice. Indeed, small, but useful, gains in energy efficiency have been observed, quickening the interest in specifically designing blends with large temperature glides. This may require the introduction of refrigerants with properties different from those of the major CFCs and HCFCs. Drawing on his chemical knowledge the author will describe the range of compounds from which such future refrigerants might be drawn and criteria for selecting them.
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Pages: p 11-19
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Details
- Original title: Extending the range.
- Record ID : 30034019
- Languages: English
- Subject: Environment
- Source: CFCs, the Day After.
- Publication date: 1994
- Document available for consultation in the library of the IIR headquarters only.
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Indexing
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Themes:
HFCs;
CFCs;
HCFCs;
Refrigerants, secondary refrigerants: regulations and standards - Keywords: HFC; CFC; Retrofitting; Comparison; Mixture; Zeotropic mixture; R134a; R32; R125; R143a
- Tags: Not translated
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- Author(s) : LEGIN L.
- Date : 2002/02/06
- Languages : French
- Source: Alternatives au R22 en génie climatique : avantages et inconvénients. Journée française du Froid : recueil des conférences.
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Evolution de la réglementation relative aux CFC...
- Author(s) : PUTAVY C., EWALD C.
- Date : 2002/02/06
- Languages : French
- Source: Alternatives au R22 en génie climatique : avantages et inconvénients. Journée française du Froid : recueil des conférences.
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Présentation du décret et du règlement F-Gaz.
- Author(s) : SAUER F.
- Date : 2007/09/19
- Languages : French
- Source: Réglementation pour fluides frigorigènes : décret 2007-737 ; F-gas 842-2006. Colloque effet de serre VI.
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Life after CFCs and HCFCs.
- Author(s) : BUTLER D. J. G.
- Date : 2001/07/02
- Languages : English
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Retrofitting vs new installation: still an econ...
- Author(s) : DAVEY J. P.
- Date : 1997/10/08
- Languages : English
- Source: R22 substitution: reality or wishful thinking. ASERCOM Symposium '97.
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