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Document IIF

Design considerations of control valve flow characteristics for air conditioning and refrigeration systems.

Auteurs : DU J., ERICKSON B., BURWELL, DICKINSON B.

Résumé

To meet the requirements of high energy efficiency, accurate and stable control, and low life cycle costing of air-conditioning and refrigeration systems in modern high rise buildings, the control elements in the integrated system are critical. The optimization of control elements performance, especially valves is discussed. Focus is on water control and its affect on the control system.
The key to energy efficiency, comfort and control is in each control loop. Control loops include sensors, controllers, heat transfer devices (coils), the controlled space, and the controlling device, often a modulating water valve. Considerations include flow capacities such as Cv which is the number of U.S. gallons per minute of water that will flow through a valve at one psi pressure drop [1] (or Kv which is the number of liters per minute of water that will flow through a valve at a one bar pressure drop, multiply Cv by .865 to obtain Kv); heat transfer characteristics of the coil; and valve flow characteristics, which determine the output from the cooling devices; rangeability ofthe valve from barely open to fully open; valve closeoff, seat leakage and water quality as it affects packing life.
The complete system should be fully integrated, complying with ISO requirements and provide for future expansion and enhancements.

Documents disponibles

Format PDF

Pages : p 180-185

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

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Détails

  • Titre original : Design considerations of control valve flow characteristics for air conditioning and refrigeration systems.
  • Identifiant de la fiche : 30033755
  • Langues : Anglais
  • Sujet : Technologie
  • Source : International Symposium on Air Conditioning in High Rise Buildings - 1997
  • Date d'édition : 09/1997
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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