US 12,313,316 B2
Air conditioner
Hiroshi Sasaki, Kanagawa (JP)
Assigned to FUJITSU GENERAL LIMITED, Kanagawa (JP)
Appl. No. 18/010,949
Filed by FUJITSU GENERAL LIMITED, Kanagawa (JP)
PCT Filed Jul. 1, 2021, PCT No. PCT/JP2021/025010
§ 371(c)(1), (2) Date Dec. 16, 2022,
PCT Pub. No. WO2022/024660, PCT Pub. Date Feb. 3, 2022.
Claims priority of application No. 2020-128371 (JP), filed on Jul. 29, 2020.
Prior Publication US 2023/0235933 A1, Jul. 27, 2023
Int. Cl. F25B 49/02 (2006.01)
CPC F25B 49/02 (2013.01) [F25B 2500/19 (2013.01); F25B 2500/24 (2013.01); F25B 2700/171 (2013.01); F25B 2700/2103 (2013.01); F25B 2700/2106 (2013.01); F25B 2700/21152 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An air conditioner having a refrigerant circuit formed by connection of an outdoor unit and an indoor unit to each other by refrigerant piping, the outdoor unit having a compressor, an outdoor heat exchanger, and an expansion valve, the indoor unit having an indoor heat exchanger, the refrigerant circuit being filled with a predetermined amount of a refrigerant, the air conditioner comprising:
a remaining refrigerant amount estimation model that estimates an amount of remaining refrigerant remaining in the refrigerant circuit by using at least rotation frequency of the compressor, refrigerant discharge temperature at the compressor, heat exchanger temperature, degree of opening of the expansion valve, and outside air temperature, of operation state quantities indicating operation states in air conditioning operation, wherein the estimate of the amount of remaining refrigerant is performed during both a heating operation and a cooling operation of the air conditioning operation, wherein
the indoor heat exchanger includes:
a first indoor heat exchanger port portion where the refrigerant flows through; a second indoor heat exchanger port portion where the refrigerant flows through; an indoor heat exchanger intermediate portion connecting the first indoor heat exchanger port portion and the second indoor heat exchanger port portion to each other; and an indoor heat exchanger intermediate sensor that is provided at the indoor heat exchanger intermediate portion and detects temperature of the refrigerant passing through the indoor heat exchanger intermediate portion, the temperature being of the heat exchanger temperature, and
the outdoor heat exchanger includes:
a first outdoor heat exchanger port portion where the refrigerant flow through; a second outdoor heat exchanger port portion where the refrigerant flows through; an outdoor heat exchanger intermediate portion connecting the first outdoor heat exchanger port portion and the second outdoor heat exchanger port portion to each other; and an outdoor heat exchanger outlet port sensor that is provided at the second outdoor heat exchanger port portion and detects temperature of the refrigerant passing through an outdoor heat exchanger outlet port in the second outdoor heat exchanger port portion in cooling operation, the temperature being of the heat exchanger temperature.