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Méthodes de contrôle alternatives pour les pompes à chaleur à adsorption.

Alternate control methods for adsorption heat pumps.

Auteurs : ROBBINS T., KINI G., GARIMELLA S.

Type d'article : Article de la RIF

Résumé

Adsorption heat pumps are often driven by heat sources with variable temperatures. They are typically optimized for operation at design conditions by suitably fixing the cycle time. Cycle time affects cooling duty, COP, and specific cooling capacity of an adsorption system. Although using fixed cycle time is the common approach, it can lead to poor system performance at off-design conditions. Two alternate control methods are investigated here. The first method, adsorbent control, uses the concentration of refrigerant within the bed as the control variable to determine switching from adsorption to desorption. The second method uses the temperature of the adsorbent bed as the control variable. These methods are compared with the fixed cycle time approach and it is found that alternate methods improve COP by 5-50% when the source temperature decreases from the design value. They are also better suited to maintain constant cooling power at higher source temperatures. A thermal switch concept that enables heat pump operation without using electricity is proposed, thus advancing the development of a fully autonomous, off-grid adsorption heat pump.

Documents disponibles

Format PDF

Pages : 127-136

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

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

Détails

  • Titre original : Alternate control methods for adsorption heat pumps.
  • Identifiant de la fiche : 30027849
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 120
  • Date d'édition : 12/2020
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2020.08.018
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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