Share

IIR document

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

Author(s) : WANG J. F., CLELAND D. J., ATKINS M. J., et al.

Summary

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.

Available documents

Format PDF

Pages: 2010-2

Available

  • Public price

    20 €

  • Member price*

    Free

* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).

Details

  • Original title: Natural working fluids based heat recovery options for dryers in the dairy industry.
  • Record ID : 2010-1212
  • Languages: English
  • Source: 9th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2010). Proceedings. Sydney, Australia, April 12-14, 2010.
  • Publication date: 2010/04/12

Links


See other articles from the proceedings (84)
See the conference proceedings

Indexing