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Document IIF

Le comportement de systèmes de chauffage dans des conditions non prévues initialement et l'influence de la conception sur la performance des pompes à chaleur à ammoniac, ou à quel point un refroidisseur à ammoniac peut-il bien fonctionner lorsqu'il est utilisé comme une pompe à chaleur ?

The behaviour of heating systems at off-design conditions and the influence on ammonia heat-pump design performance or how well can a standard ammonia chiller perform, when used as a heat pump?

Auteurs : NIELSEN G.

Résumé

The use of dodgy rules of thumb, combined with lack of overall system understanding, has lead to the overall accepted "fact" that using ammonia as refrigerant in heat pump systems, require either low temperature heating systems or high temperature heat pumps. This "fact" is, in fact, not correct, but has, never the less, virtually banned the use of an extremely efficient refrigerant in heat pump applications. When the heating system is analyzed, designed and run carefully, it is seen that the main bulk of the heat demand is at temperature levels where a standard ammonia chiller, has no problem performing well. The author also shows that a little tinkering with the cooling cycle will make a chiller able to deliver hot tap water, with increased cycle efficiency as a result.

Documents disponibles

Format PDF

Pages : 2008-2

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  • 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 : The behaviour of heating systems at off-design conditions and the influence on ammonia heat-pump design performance or how well can a standard ammonia chiller perform, when used as a heat pump?
  • Identifiant de la fiche : 2009-0361
  • Langues : Anglais
  • Source : 8th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2008)
  • Date d'édition : 07/09/2008

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