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Retrofitting large refrigeration systems with HFC134a.

Author(s) : BRESNAHAN J.

Type of article: Article

Summary

The article begins with an overview of the replacement of R12 with R134a, and the subsequent change from mineral oil to a synthetic lubricant. In retrofitting an ester based oil is preferred to a polyalkylene glycol as it can be used alone or mixed with mineral oil before R12 is replaced. The performance of R134a in a system designed for R12 may increase at high evaporation temperatures or decrease at low temperatures. Many systems can be retrofitted changing only the drier charge and expansion device. Metals and synthetic rubbers are generally not affected. A step by step guide for changing first the oil, then the refrigerant, is described. Followed by reports on a specific retrofit on a glycol cooling plant of almost 30 kilowatt capacity air conditioning in a chocolate manufacturing plant. The results were a small increase in measured capacity and COP. Test results on material corrosion with ester and mineral oils in refrigerants are given. D.W.H.

Details

  • Original title: Retrofitting large refrigeration systems with HFC134a.
  • Record ID : 1994-3406
  • Languages: English
  • Source: AIRAH J. - vol. 47 - n. 10
  • Publication date: 1993/10
  • Document available for consultation in the library of the IIR headquarters only.

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