US 11,754,330 B2
Refrigeration cycle apparatus
Yuki Mori, Tokyo (JP); Masashi Fujitsuka, Tokyo (JP); and Takahiro Nakai, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/428,978
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Mar. 11, 2019, PCT No. PCT/JP2019/009660
§ 371(c)(1), (2) Date Aug. 6, 2021,
PCT Pub. No. WO2020/183560, PCT Pub. Date Sep. 17, 2020.
Prior Publication US 2022/0136751 A1, May 5, 2022
Int. Cl. F25B 49/02 (2006.01)
CPC F25B 49/022 (2013.01) 7 Claims
OG exemplary drawing
 
1. A refrigeration cycle apparatus comprising:
a compressor whose rotation number is a variable; and
a control apparatus configured to calculate a rotation number command of the compressor for handling the rotation number of the compressor, the control apparatus including processing circuitry
to calculate the rotation number of the compressor as a capacity rotation number by using a first controller including at least a first integrator to cause a current capacity value indicating current capacity of the refrigeration cycle apparatus to be a capacity target value,
to calculate the rotation number of the compressor as a protection rotation number by using a second controller including at least a second integrator to cause a protection variable being a variable related to a limitation item including protection of the refrigeration cycle apparatus to be a protection target value,
to select any one of the capacity rotation number calculated and the protection rotation number calculated as the rotation number command of the compressor, and
to apply predetermined upper and lower-limit limitations to the rotation number command, and output a final rotation number command to the compressor, wherein
the first controller performs reset processing of the first integrator by using a difference between output of the first controller and the final rotation number command, and
the second controller performs reset processing of the second integrator by using a difference between output of the second controller and the final rotation number command.