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Relations énergétiques dans les systèmes frigorifiques indirects.

Energiförhållanden för indirekta kylsystem.

Auteurs : LINDBORG A.

Type d'article : Article

Résumé

Well-designed indirect systems for chilling applications can offer lower connection charges and lower energy consumption by comparison with direct systems. Indirect systems are also an important factor in the phasing out of CFC/HCFC refrigerants. The problem is that the installer who wants to sell direct expansion systems are using the calculation in kW power related to kW capacity as proof that this means lower energy consumption. When the true energy consumption of a direct system is metered over a full year and the activity is compared with similar activity with indirect system, then it has been observed that the kWh per year and m3 is in favour for the indirect system. Power and energy is like apples and pears and cannot be compared. The selection of secondary refrigerant systems is not wholly influenced by their thermo physical properties and hygiene but also been influenced by emotional factors not always grounded in objective analysis. The potassium salts (KCOOH and CH3KOOH) which have become popular during the last 5-10 years are hygienic and can equal ethylene glycol and calcium chloride in energy performance. However these potassium salts are extremely corrosive and require knowledge and skill in the design and selection of system components. Leakage from systems using with potassium salts can produce very negative consequences including serious corrosion and disturbance to operation routines.

Détails

  • Titre original : Energiförhållanden för indirekta kylsystem.
  • Identifiant de la fiche : 2004-2773
  • Langues : Norvégien
  • Source : Kulde Skand. - vol. 19 - n. 3
  • Date d'édition : 2004
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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