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Document IIF

Fluides actifs naturels basés sur des options de récupération de chaleur pour les systèmes de séchage utilisés dans l'industrie laitière.

Natural working fluids based heat recovery options for dryers in the dairy industry.

Auteurs : WANG J. F., CLELAND D. J., ATKINS M. J., et al.

Résumé

Spray dryers commonly used in the dairy industry are characterized by quite high inlet air temperatures, no air recycle and minimal heat recovery so the thermal efficiency is often less than 50%. The opportunities for heat recovery in a typical dairy product spray drying plant were assessed with an emphasis on systems that use natural working fluids. Heat exchange heat recovery is limited to about 15% of the air heating load. With heat pumps, it is practical to provide up to about 45% of the air heating load with energy efficiency that could justify the extra capital cost. The transcritical cycle is thermodynamically well-matched to the process with dehumidification of outlet air at a constant temperature and inlet air heating in the supercritical region. However, the ideal critical temperature is above 60°C, so a trade-off between efficiency, cost and safety may be needed with respect to refrigerant choice. Full dehumidifying spray dryers are unlikely to be feasible due to the high inlet air temperatures required.

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Pages : 2010-2

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Détails

  • Titre original : Natural working fluids based heat recovery options for dryers in the dairy industry.
  • Identifiant de la fiche : 2010-1212
  • Langues : Anglais
  • Source : 9th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2010). Proceedings. Sydney, Australia, April 12-14, 2010.
  • Date d'édition : 12/04/2010

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