Refrigerating system and refrigerating system control method

Abstract

A refrigerating system of the present invention includes a plurality of parallel type refrigerators each of which has a plurality of compressors, and a host control device having a compressor start/stop permission output unit which is configured to output a compressor activation permission or a compressor stop permission to one of the plurality of parallel type refrigerators which is activated according to a predetermined permission condition. Each of the parallel-type refrigerators has a compressor activation control unit which is configured to a stopped compressor included in a certain refrigerator when a load factor of the certain refrigerator is equal to or greater than a first specified value and the compressor activation permission is received, and a compressor stop control unit which is configured to stop an activated compressor included in a certain refrigerator when the load factor of the certain refrigerator is less than a second specified value and the compressor stop permission is received.

1 .- 6 . (canceled) 
     
     
         7 . A refrigerating system comprising:
 a plurality of parallel type refrigerators each of which has a plurality of compressors; and   a host control device having a compressor start/stop permission output unit which is configured to output a compressor activation permission or a compressor stop permission to one of the plurality of parallel type refrigerators according to an output mode indicating a type of output required for all of the plurality of parallel type refrigerators and a predetermined permission condition,   wherein the compressor start/stop permission output unit determines to which of the parallel type refrigerators that is activated the compressor activation permission is output and to which of the parallel type refrigerators that is stopped the compressor activation permission is output according to the output mode, and   each of the parallel type refrigerators includes a compressor activation control unit which is configured to activate a stopped compressor included in a certain refrigerator when a load factor of the certain refrigerator is equal to or greater than a first specified value and the compressor activation permission is received, and a compressor stop control unit which is configured to stop an activated compressor included in a certain refrigerator when the load factor of the certain refrigerator is less than a second specified value and the compressor stop permission is received.   
     
     
         8 . The refrigerating system according to  claim 7 , wherein the compressor start/stop permission output unit is able to output the next compressor activation permission or compressor stop permission after a predetermined activation permission waiting time or stop permission waiting time has elapsed when the compressor of the parallel type refrigerator is activated or stopped according to the compressor activation permission or the compressor stop permission. 
     
     
         9 . The refrigerating system according to  claim 8 , wherein the host control device further includes a unit number control unit which is configured to activate or stop a main body of each of the parallel type refrigerators according to an output required for all of plurality of parallel type refrigerators, when the main body is activated or stopped, the unit number control unit is able to activate or stop the next main body after measurement of a predetermined stage increase prohibition time or stage decrease prohibition time ends, and the measurement of the stage increase prohibition time or the stage decrease prohibition time is reset when the compressor of the parallel type refrigerator is activated or stopped according to the compressor activation permission or the compressor stop permission. 
     
     
         10 . The refrigerating system according to  claim 9 , wherein the activation permission waiting time and the stop permission waiting time are shorter than the stage increase prohibition time and the stage decrease prohibition time. 
     
     
         11 . The refrigerating system according to  claim 7 , wherein:
 the compressor start/stop permission output unit is configured to output the compressor activation permission to the parallel type refrigerator having the highest priority among the parallel type refrigerators in which one or more of the compressors are not activated and output the compressor stop permission to the parallel type refrigerator having the lowest priority among the parallel type refrigerators in which two or more of the compressors are not activated,   when a predetermined malfunction occurs in the parallel type refrigerator which is activated, the priority of the parallel type refrigerator is set to be the lowest among the parallel type refrigerators which are activated, and   when a predetermined malfunction occurs in the parallel type refrigerator which is stopped, the priority of the parallel type refrigerator is set to be the lowest among the parallel type refrigerators which are stopped.   
     
     
         12 . A refrigerating system control method using a plurality of parallel type refrigerators each of which has a plurality of compressors, and a host control device having a compressor start/stop permission output unit which is configured to output a compressor activation permission or a compressor stop permission to one of the plurality of parallel type refrigerators according to an output mode indicating a type of output required for the whole of the plurality of parallel type refrigerators and a predetermined permission condition,
 wherein the compressor start/stop permission output unit determines to which of the parallel type refrigerators that is activated the compressor activation permission is output and to which of the parallel type refrigerators that is stopped the compressor activation permission is output according to the output mode, and   in each of the parallel type refrigerators, a stopped compressor included in a certain refrigerator is activated by a compressor activation control unit when a load factor of the certain refrigerator is equal to or greater than a first specified value and the compressor activation permission is received, and an activated compressor included in a certain refrigerator is stopped by a compressor stop control unit when the load factor of the certain refrigerator is less than a second specified value and the compressor stop permission is received.