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Méthode d’estimation inverse de la masse volumique et de la chaleur spécifique des grains de céréales pendant le séchage par pompe à chaleur.

An inverse method to estimate bulk density and specific heat of cereal grains during heat pump drying.

Numéro : 2593

Auteurs : EBRAHIMIFAKHAR A., YUILL D.

Résumé

Cereal grains are one of the most important sources of nutrients in both developed and developing countries. Quality preservation of cereal grains is a major issue between harvest and utilization. Heat pump grain dryers can be used to preserve grain quality during storage, since grain spoilage can be averted by drying or chilling the grain. In this paper, the use of inverse methods to estimate grain properties during heat pump drying is investigated. An inverse method was developed to estimate the bulk density and specific heat of cereal grains during heat pump drying during the heat and mass transfer processes associated with drying the grain, using only grain temperature measurements as inputs. The solution for the inverse problem was based on minimizing the sum of the squares of the errors between the estimated and measured temperatures with respect to the unknown parameters. Since inverse problems are very sensitive to inevitable measurements errors, the conjugate gradient method was used to overcome the ill-posedness of the problem. The effects of measurement errors and the sensor location on the inverse solution were discussed. The results showed that the inverse method works better when the sensor is located nearer to the bottom of the grain bed. The close agreement between the exact and the estimated results indicates the potential of the developed method in estimating the thermophysical properties in a variety of cereal grains.

Documents disponibles

Format PDF

Pages : 10

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : An inverse method to estimate bulk density and specific heat of cereal grains during heat pump drying.
  • Identifiant de la fiche : 30028562
  • Langues : Anglais
  • Source : 2021 Purdue Conferences. 18th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 05/2021
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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