US 12,326,271 B2
Air-conditioning apparatus
Shohei Ishimura, Tokyo (JP); Naofumi Takenaka, Tokyo (JP); Masakazu Kondo, Tokyo (JP); Yoshiyuki Tada, Tokyo (JP); and Atsushi Kawashima, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 18/269,569
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Feb. 1, 2021, PCT No. PCT/JP2021/003517
§ 371(c)(1), (2) Date Jun. 26, 2023,
PCT Pub. No. WO2022/162937, PCT Pub. Date Aug. 4, 2022.
Prior Publication US 2024/0053049 A1, Feb. 15, 2024
Int. Cl. F24F 11/86 (2018.01); F24F 11/87 (2018.01); F24F 11/871 (2018.01); F24F 110/12 (2018.01); F24F 140/20 (2018.01)
CPC F24F 11/86 (2018.01) [F24F 11/871 (2018.01); F24F 2110/12 (2018.01); F24F 2140/20 (2018.01)] 11 Claims
OG exemplary drawing
 
1. An air-conditioning apparatus comprising:
a refrigerant circuit in which a compressor, an outdoor heat exchanger, a pressure reducing device, and an indoor heat exchanger are connected in sequence by a pipe, and configured to allow refrigerant to cycle through the refrigerant circuit;
an outdoor fan configured to send air to the outdoor heat exchanger;
an outdoor air temperature sensor configured to measure a temperature of outside air;
an indoor heat exchanger intermediate temperature sensor configured to measure a temperature of refrigerant flowing through an intermediate portion of the indoor heat exchanger;
an indoor heat exchanger outlet temperature sensor configured to measure a temperature of refrigerant flowing through an outlet of the indoor heat exchanger; and
a controller configured to, when a measured value from the outdoor air temperature sensor is equal to or less than a predetermined value, perform a low-outside-air-temperature cooling operation mode, wherein
in the low-outside-air-temperature cooling operation mode,
the controller is configured to reduce a rotation speed of the outdoor fan, and to, when a difference between a measured value from the indoor heat exchanger outlet temperature sensor and a measured value from the indoor heat exchanger intermediate temperature sensor is equal to or greater than a first threshold, increase an opening degree of the pressure reducing device.