Startup control system and method for a multiple compressor...

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

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F25B 49/02 (2006.01)

Patent

CA 2561921

A startup control algorithm for a multiple compressor liquid chiller system (300) is provided wherein the maximum number of compressors (302, 303) to be started to satisfy system load conditions is provided. The control algorithm designates all of the compressors (302, 303) of the multiple compressor system (300) for starting and reduces the number to be started in response to the satisfaction of several predetermined criteria. The predetermined criteria are related to the leaving chilled liquid temperature, the shutdown time for the chiller system (300) and the last operating time period for the chiller system (300).

Un algorithme de commande de démarrage pour un système refroidisseur de liquide à multiple compresseurs (300). Le nombre maximal de compresseurs (302, 303) à mettre en marche est défini de manière à satisfaire les exigences de charge de système. L'algorithme de commande désigne tous les compresseurs (302, 303) du système (300) à multiples compresseurs pour le démarrage et la réduction du nombre de compresseurs de manière à répondre à plusieurs critères prédéterminés. Les critères sont en rapport avec la température de liquide refroidi partant, la durée de mise hors service pour le système refroidisseur (300) et la dernière période opérationnelle pour le système refroidisseur.

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