Method of refrigeration case control

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

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F25B 49/02 (2006.01) F25B 41/06 (2006.01) F25D 29/00 (2006.01) G05D 23/19 (2006.01)

Patent

CA 2147065

A method of controlling a refrigeration case of a refrigeration system including the steps of locating an expansion valve of a refrigeration case, moving the expansion valve of the refrigeration case out of a predetermined position, sampling temperature readings from an evaporator coil of a refrigeration case, calculating an adaptive proportional-integral-differential (PID) of the temperature of the evaporator coil for the refrigeration case, and moving the expansion valve to a second position closer to the predetermined position based on the calculated proportional-integral-differential until the temperature of the evaporator coil for the refrigeration case is within a predetermined temperature range.

Méthode pour la régulation d'une caisse de réfrigération dans un système de réfrigération comportant les étapes de localisation du robinet détendeur d'une caisse de réfrigération suivi du déplacement du robinet détendeur et de l'échantillonnage des relevés de température du serpentin d'évaporateur; calcul de la commande proportionnelle et intégrale dérivée (PID) de la température du serpentin d'évaporateur pour la caisse de réfrigération; mise en place du robinet détendeur dans un deuxième emplacement plus rapproché de la position prédéterminée, sur la base du calcul de la commande proportionnelle et dérivée jusqu'à ce que la température du serpentin d'évaporateur soit comprise à l'intérieur d'une plage de températures prédéterminée.

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