Refrigeration cycle device, control method, and non-transitory computer-readable storage medium

Abstract

Provided is a refrigeration cycle device including: a refrigeration cycle circuit comprising a compressor configured to compress a refrigerant; an operating state detector configured to detect an operating state of the refrigeration cycle circuit; a protection target value determinator configured to determine, based on the operating state, a protection target value of a protection variable regarding the refrigeration cycle circuit; and a rotation speed determinator configured to determine an operating rotation speed of the compressor, based at least on the protection target value and a capability target value of a temperature adjusted by the refrigeration cycle circuit. Thereby, it is possible to prevent the performance from being unnecessarily restricted.

1 . A refrigeration cycle device comprising:
 a refrigeration cycle circuit comprising a compressor configured to compress a refrigerant;   an operating state detector configured to detect an operating state of the refrigeration cycle circuit;   a protection target value determinator configured to determine, based on the operating state, a protection target value of a protection variable regarding the refrigeration cycle circuit; and   a rotation speed determinator configured to:
 compare a capability rotation speed of the compressor necessary to make a temperature to be adjusted by the refrigeration cycle circuit asymptotic or identical to a capability target value and a protection rotation speed of the compressor necessary to make a value of the protection variable asymptotic or identical to the protection target value, and 
 determine as an operating rotation speed of the compressor, a smaller one of the capability rotation speed and the protection rotation speed. 
   
     
     
         2 . The refrigeration cycle device of  claim 1 , wherein
 the rotation speed determinator comprises an I (integral) controller, a PI (proportional-integral) controller, or a PID (proportional-integral-derivative) controller configured to control the protection variable to be asymptotic to the protection target value.   
     
     
         3 . The refrigeration cycle device of  claim 1 , wherein
 the protection variable includes any one of a discharge temperature of the refrigerant discharged from the compressor, a condensation temperature of the refrigerant, an evaporation temperature of the refrigerant, a high pressure of the refrigerant, and a low pressure of the refrigerant.   
     
     
         4 . The refrigeration cycle device of  claim 1 , wherein
 the operating state is-includes an outside temperature or an indoor temperature.   
     
     
         5 . The refrigeration cycle device of  claim 4 , further comprising:
 a storage configured to store a correspondence between the outside temperature or the indoor temperature and the protection target value,   wherein the protection target value determinator is configured to determine the protection target value by referring to the correspondence stored in the storage.   
     
     
         6 . The refrigeration cycle device of  claim 1 , wherein
 the operating state includes a condensation temperature or a high pressure of the refrigerant, and an evaporation temperature or a low pressure of the refrigerant.   
     
     
         7 . The refrigeration cycle device of  claim 6 , further comprising:
 a storage configured to store an operation map indicating an operating pressure range or an operating temperature range of the refrigerant,   wherein the protection target value determinator is configured to determine the protection target value corresponding to the operating state by referring to the operation map stored in the storage.   
     
     
         8 . A control method for a refrigeration cycle device comprising a compressor configured to compress a refrigerant, the control method comprising:
 detecting an operating state of the refrigeration cycle device;   determining, based on the operating state, a protection target value of a protection variable regarding the refrigeration cycle device; and   comparing a capability rotation speed of the compressor necessary to make a temperature to be adjusted by the refrigeration cycle device asymptotic or identical to a capability target value and a protection rotation speed of the compressor necessary to make a value of the protection variable asymptotic or identical to the protection target value, and determining as an operating rotation speed of the compressor a smaller one of the capability rotation speed and the protection rotation speed.   
     
     
         9 . The control method of  claim 8 , wherein
 the protection variable includes any one of a discharge temperature of the refrigerant discharged from the compressor, a condensation temperature of the refrigerant, an evaporation temperature of the refrigerant, a high pressure of the refrigerant, and a low pressure of the refrigerant.   
     
     
         10 . The control method of  claim 8 , wherein
 the operating state includes an outside temperature or an indoor temperature.   
     
     
         11 . The control method of  claim 10 , further comprising:
 storing a correspondence between the outside temperature or the indoor temperature and the protection target value; and   determining the protection target value by referring to the correspondence.   
     
     
         12 . The control method of  claim 8 , wherein
 the operating state includes a condensation temperature or a high pressure of the refrigerant, and an evaporation temperature or a low pressure of the refrigerant.   
     
     
         13 . The control method of  claim 12 , further comprising:
 storing an operation map indicating an operating pressure range or an operating temperature range of the refrigerant; and   determining the protection target value corresponding to the operating state by referring to the operation map.   
     
     
         14 . A non-transitory computer-readable storage medium storing a program causing a refrigeration cycle device comprising a compressor configured to compress a refrigerant to:
 detect an operating state of the refrigeration cycle device;   determine, based on the operating state, a protection target value of a protection variable regarding the refrigeration cycle device; and   compare a capability rotation speed of the compressor necessary to make a temperature to be adjusted by the refrigeration cycle device asymptotic or identical to a capability target value and a protection rotation speed of the compressor necessary to make a value of the protection variable asymptotic or identical to the protection target value, and determine as an operating rotation speed of the compressor, a smaller one of the capability rotation speed and the protection rotation speed.   
     
     
         15 . The non-transitory computer-readable storage medium of  claim 14 , wherein
 the protection variable includes any one of a discharge temperature of the refrigerant discharged from the compressor, a condensation temperature of the refrigerant, an evaporation temperature of the refrigerant, a high pressure of the refrigerant, and a low pressure of the refrigerant.   
     
     
         16 . The non-transitory computer-readable storage medium of  claim 14 , wherein
 the operating state includes an outside temperature or an indoor temperature.   
     
     
         17 . The non-transitory computer-readable storage medium of  claim 16 , wherein the program further causes the refrigeration cycle device to:
 store a correspondence between the outside temperature or the indoor temperature and the protection target value; and   determine the protection target value by referring to the correspondence.   
     
     
         18 . The non-transitory computer-readable storage medium of  claim 14 , wherein
 the operating state includes a condensation temperature or a high pressure of the refrigerant, and an evaporation temperature or a low pressure of the refrigerant.   
     
     
         19 . The non-transitory computer-readable storage medium of  claim 18 , wherein the program further causes the refrigeration cycle device to:
 store an operation map indicating an operating pressure range or an operating temperature range of the refrigerant; and   determine the protection target value corresponding to the operating state by referring to the operation map.