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Document IIF

Régulation d'un détendeur thermostatique utilisant un mélange d'isobutane et de propane comme frigorigène non azéotropique.

Thermostatic valve control using a non-azeotropic refrigerant, isobutane-propane mixture.

Auteurs : CASTLE T. P., RICHARDSON R. N., RITTER T. J.

Type d'article : Article, Article de la RIF

Résumé

This article describes the evaluation and comparison of a conventional R12 cross-charged thermostatic valve and an electronic expansion valve using a non-azeotropic refrigerant mixture; isobutane-propane mixture (CARE30). The superheat temperature setting on an expansion valve needs to compensate for the temperature glide associated with a non-azeotropic refrigerant as these can be of similar magnitude. It is also advisable to increase the superheat setting to make allowance for change in refrigerant composition as a result of preferential refrigerant-oil solubility. The majority of refrigeration systems operate at fixed evaporating temperatures, hence, once superheat setting is trimmed during commissioning, then there should be no further problems associated with evaporation of a non-azeotropic refrigerant provided the system is leak-tight. An R12 expansion valve with a factory superheat setting of 5 deg C tested over a wide range of evaporating temperatures proved satisfactory in operation with CARE30 after increasing the superheat temperature screw setting equivalent to 5 deg C.

Documents disponibles

Format PDF

Pages : 313-318

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 : Thermostatic valve control using a non-azeotropic refrigerant, isobutane-propane mixture.
  • Identifiant de la fiche : 1999-2765
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 22 - n. 4
  • Date d'édition : 06/1999

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