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Document IIF

Contaminants dans des systèmes frigorifiques à ammoniac.

Contaminants in ammonia refrigeration systems.

Auteurs : COTTER D., MISSENDEN J., MAIDMENT G.

Résumé

Contaminants (mainly air, water, dirt and lubricants) affect the performance of refrigeration systems. When air enters a refrigeration system it contains moisture (water). In refrigeration systems the air is usually found in the high-pressure side of the system, while the water will find its way to the low-pressure side of the system through the expansion valve. The air will cause the condensing pressure to increase in the high side of the system. The water in the low-pressure side of the system will result in a lower pressure in the evaporators to achieve the desired evaporating temperature. This explains some of the shortcomings of ammonia in DX low temperature applications. The breakdown of lubricants (i.e. sludge) differs for mineral, alkyl benzene, hydro-cracked, PAO and PAG lubricants. This has the effect of reducing the evaporator performance as it coats the internal heat transfer surfaces. The paper numerically assesses the effects of each contaminant and their accumulative effect on refrigeration system performance, outline the steps to be taken to reduce contaminants entering ammonia refrigeration system and describe how the contaminant can be removed.

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Format PDF

Pages : 2007-2

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Contaminants in ammonia refrigeration systems.
  • Identifiant de la fiche : 2007-2077
  • Langues : Anglais
  • Source : Ammonia Refrigeration Technology for Today and Tomorrow.
  • Date d'édition : 19/04/2007

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