Turbo refrigerator, refrigerator control device, turbo refrigerator control method, and program

Abstract

This turbo refrigerator comprises: a turbo compressor that compresses a refrigerant gas; a vane that is capable of adjusting the flow rate of the refrigerant gas sucked in by the turbo compressor; a condenser that causes, by means of heat exchange, the refrigerant gas compressed by the turbo compressor to release heat and therefore become condensed; an expansion valve that expands a liquid refrigerant guided from the condenser; an evaporator that causes, by means of heat exchange, the liquid refrigerant expanded by the expansion valve to absorb heat and therefore evaporate; and a refrigerator control device. The refrigerator control device comprises: an acquisition unit that acquires at least a state quantity of the refrigerant gas during startup of the turbo refrigerator; an opening degree determination unit that determines the opening degree of the vane on the basis of the acquired state quantity; and an opening degree control unit that controls the opening degree of the vane on the basis of the determined opening degree.

1 . A centrifugal chiller comprising:
 a turbo compressor that compresses a refrigerant gas;   a vane that is capable of adjusting flow rate of the refrigerant gas sucked by the turbo compressor;   a condenser that condenses the refrigerant gas compressed by the turbo compressor by causing the refrigerant gas to release heat through heat exchange;   an expansion valve that expands a liquid refrigerant introduced from the condenser;   an evaporator that evaporates the liquid refrigerant expanded by the expansion valve by causing the liquid refrigerant to absorb heat through heat exchange; and   a chiller control device,   wherein the chiller control device includes
 an acquisition unit that acquires at least a state amount of the refrigerant gas when starting the centrifugal chiller, 
 an opening degree determination unit that determines an opening degree of the vane based on the acquired state amount, and 
 an opening degree control unit that controls the opening degree of the vane based on the determined opening degree. 
   
     
     
         2 . The centrifugal chiller according to  claim 1 ,
 wherein the acquisition unit acquires at least one of a pressure and a temperature of the refrigerant gas sucked by the turbo compressor as the state amount of the refrigerant gas.   
     
     
         3 . The centrifugal chiller according to  claim 2 , further comprising:
 a pressure sensor that detects the pressure of the refrigerant gas on an outlet side of the evaporator,   wherein the acquisition unit acquires the pressure of the refrigerant gas detected by the pressure sensor as the state amount of the refrigerant gas.   
     
     
         4 . The centrifugal chiller according to  claim 2 ,
 wherein the acquisition unit acquires an operating rotation speed of the turbo compressor during a steady operation of the centrifugal chiller, and   the opening degree determination unit calculates the opening degree of the vane based on a differential pressure between an upstream side and a downstream side of the vane in a suction direction of the refrigerant gas.   
     
     
         5 . The centrifugal chiller according to  claim 1 ,
 wherein the opening degree determination unit determines the opening degree of the vane such that the opening degree falls between a minimum opening degree set value and a maximum opening degree set value of the opening degree of the vane set in advance.   
     
     
         6 . A chiller control device of a centrifugal chiller including a turbo compressor that compresses a refrigerant gas, a vane that is capable of adjusting flow rate of the refrigerant gas sucked by the turbo compressor, a condenser that condenses the refrigerant gas compressed by the turbo compressor by causing the refrigerant gas to release heat through heat exchange, an expansion valve that expands a liquid refrigerant introduced from the condenser, and an evaporator that evaporates the liquid refrigerant expanded by the expansion valve by causing the liquid refrigerant to absorb heat through heat exchange, the chiller control device comprising:
 an acquisition unit that acquires at least a state amount of the refrigerant gas when starting the centrifugal chiller;   an opening degree determination unit that determines an opening degree of the vane based on the acquired state amount; and   an opening degree control unit that controls the opening degree of the vane based on the determined opening degree.   
     
     
         7 . A control method of a centrifugal chiller including a turbo compressor that compresses a refrigerant gas, a vane that is capable of adjusting flow rate of the refrigerant gas sucked by the turbo compressor, a condenser that condenses the refrigerant gas compressed by the turbo compressor by causing the refrigerant gas to release heat through heat exchange, an expansion valve that expands a liquid refrigerant introduced from the condenser, and an evaporator that evaporates the liquid refrigerant expanded by the expansion valve by causing the liquid refrigerant to absorb heat through heat exchange, the control method comprising:
 acquiring at least a state amount of the refrigerant gas when starting the centrifugal chiller; 
 determining an opening degree of the vane based on the acquired state amount; and 
 controlling the opening degree of the vane based on the determined opening degree. 
 
     
     
         8 . A non-transitory computer-readable recording medium that stores a program causing a computer included in a centrifugal chiller, including a turbo compressor that compresses a refrigerant gas, a vane that is capable of adjusting flow rate of the refrigerant gas sucked by the turbo compressor, a condenser that condenses the refrigerant gas compressed by the turbo compressor by causing the refrigerant gas to release heat through heat exchange, an expansion valve that expands a liquid refrigerant introduced from the condenser, and an evaporator that evaporates the liquid refrigerant expanded by the expansion valve by causing the liquid refrigerant to absorb heat through heat exchange, to execute:
 a procedure of acquiring at least a state amount of the refrigerant gas when starting the centrifugal chiller;   a procedure of determining an opening degree of the vane based on the acquired state amount; and   a procedure of controlling the opening degree of the vane based on the determined opening degree.