To provide a refrigeration air conditioning system that performs load change predictive control capable of suppressing hunting of temperature, which is to be controlled, even during a load change period.
The refrigeration air conditioning system includes an m (m≥1) units of refrigeration air conditioning devices 70 in which n (n≥2) compressors 1a that compress and discharge refrigerant, a condenser 3a which condenses the refrigerant by heat exchange, a throttling device 4a for depressurizing the refrigerant related to the condensation, and an evaporator 5a for cooling an object which is expected to be heat-exchanged by heat exchange with the refrigerant, are connected together by piping to constitute an upper stream side refrigerant circuit 50. It also includes a control circuit 30 which calculates an actual load, determines a load deviation state based on the load deviation which is the absolute value of a difference between the actual load and an average movement of the actual loads at a predetermined frequency, to control a refrigerant circuit that is operated with a control parameter corresponding to the load deviation state being set.
Kiyoshi Yasushima
Takanashi Norio
Motoki Shandong
Taku Ogawa
Murata Kensei
Moto Otani