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Extended Kalman filter based LQ control: application to microwave food thawing.

Author(s) : AKKARI E., CHEVALLIER S., BOILLEREAUX L.

Summary

The use of microwaves is an effective way to obtain a quick thawing of frozen foods. However, an unwanted phenomenon, called thermal runaway, appears during such treatments. A relevant solution to prevent from this drawback consists in coupling to the microwave power a cold tangential air blast and thus to consider the microwave power and the air velocity as manipulated variables. The heat transfer is modelled via the effective heat capacity method and a source term representing the electromagnetic/heat energy conversion inside the product. The control of the heat transfer is carried out with a LQ approach extended to non linear systems and based on a reduction of the heat equation using finite volumes. The internal temperatures, required by the controller, are estimated with the well-known Extended Kalman Filter. Results obtained in simulation are discussed and finally a simplified version of the control (constant air velocity) is tested experimentally during thawing of a block of tylose.

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Pages: ICR07-C2-707

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Details

  • Original title: Extended Kalman filter based LQ control: application to microwave food thawing.
  • Record ID : 2008-0271
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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