Pulse electrothermal deicing of complex shapes

F - Mech Eng,Light,Heat,Weapons – 25 – C

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F25C 5/08 (2006.01) F25D 21/08 (2006.01)

Patent

CA 2653021

A pulse electrothermal deicing apparatus comprises at least one complex shape ( 40(2), 40(3), 40(4) ) characterized by a thickness profile configured to generate uniform power per unit area to melt an interfacial layer of ice. A method of optimizing thicknesses of complex shapes for a pulse electrothermal deicing system includes assigning initial estimates of the pulse electrothermal deicing system parameters. A temperature distribution, a temperature range and a refreezing time produced by a deicing pulse are modeled. Shape thicknesses are adjusted according to the temperature range, deicing pulse parameters are adjusted according to the deicing pulse, and the modeling and adjusting is repeated until the temperature range and the refreezing time are within predetermined limits.A pulse electrothermal deicing apparatus comprises at least one complex shape ( 40(2), 40(3), 40(4) ) characterized by a thickness profile configured to generate uniform power per unit area to melt an interfacial layer of ice. A method of optimizing thicknesses of complex shapes for a pulse electrothermal deicing system includes assigning initial estimates of the pulse electrothermal deicing system parameters. A temperature distribution, a temperature range and a refreezing time produced by a deicing pulse are modeled. Shape thicknesses are adjusted according to the temperature range, deicing pulse parameters are adjusted according to the deicing pulse, and the modeling and adjusting is repeated until the temperature range and the refreezing time are within predetermined limits.

La présente invention concerne un appareil de dégivrage électrothermique par impulsions, qui comprend au moins une forme complexe caractérisée par un profil d'épaisseur conçu pour générer une puissance par unité de surface uniforme de manière à faire fondre une couche interfaciale de glace. L'invention concerne également un procédé permettant d'optimiser l'épaisseur de formes complexes destinées à un système de dégivrage électrothermique par impulsions, qui consiste : à assigner des estimations initiales des paramètres du système de dégivrage électrothermique par impulsions; à modéliser une répartition de la température, une plage de températures et un temps de regel qui sont fonctions d'une impulsion de dégivrage; à ajuster l'épaisseur des formes en fonction de la plage de températures, à ajuster les paramètres des impulsions de dégivrage en fonction de l'impulsion de dégivrage, et à répéter la modélisation et l'ajustement jusqu'à ce que la plage de températures et le temps de regel se trouvent dans des limites prédéterminées.

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