Variable speed control of a centrifugal chiller using fuzzy...

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

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F25B 49/02 (2006.01)

Patent

CA 2258933

A capacity control system for a refrigeration system including a compressor, a condenser, and an evaporator all connected in a closed refrigeration circuit, the compressor having a plurality of adjustable inlet guide vanes and driven by an internal combustion engine, signals indicating the condenser pressure; the evaporator pressure; the inlet guide vanes position; the engine speed; the chilled water discharge temperature; and the engine intake manifold pressure are processed by a microprocessor to continuously calculate a surface speed and to equalize engine speed and calculated surface speed utilizing a fuzzy logic algorithm.

La présente invention sert à réguler la puissance d'un système frigorifique comprenant un compresseur, un condenseur et un évaporateur reliés les uns aux autres en un circuit de réfrigération fermé, le compresseur étant muni de plusieurs aubes directrices d'admission réglables entraînées par un moteur à combustion interne. Les signaux indiquant la pression du condenseur, la pression de l'évaporateur, la position des aubes directrices d'entrée, la vitesse du moteur, la température de refoulement de l'eau réfrigérée et la pression dans la tubulure d'admission du moteur sont traités par un microprocesseur qui calcule en continu une vitesse périphérique et qui égalise la vitesse du moteur et la vitesse périphérique calculée à l'aide d'un algorithme à logique floue.

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