Denso Corporation

Hiroya Hasegawa

Yuichi Shirota

Tatsuhiro Suzuki

Gouta Ogata

Etsuhisa Yamada

Makoto Ikegami

Satoshi Ito

An air conditioner includes an inside condenser, an outside heat exchanger, an inside evaporator, a refrigerant circuit switcher, and an air passage switcher. The refrigerant circuit switcher is configured to switch a layout of the refrigerant circuit to (i) a first circuit during a heating mode such that the refrigerant releases heat at the inside condenser and is decompressed to evaporate at the outside heat exchanger and (ii) a second circuit during a defrosting mode such that the refrigerant releases heat at the outside heat exchanger and is decompressed to evaporate at the inside evaporator. The air passage switcher is configured to switch the air passage to (i) a first passage during the heating mode such that the air passes through the inside evaporator and the inside condenser and (ii) a second passage during the defrosting mode such that the air bypasses the inside condenser.

Air conditioner, air conditioning system, and air-conditioning controller

An ejector-integrated heat exchanger includes multiple tube forming members. The tube forming member includes an ejector, a flow-out side refrigerant passage, and a suction side refrigerant passage. The ejector includes a nozzle portion decompressing a refrigerant, a refrigerant suction port, and a pressure increasing portion in which the refrigerant drawn from the refrigerant suction port and the refrigerant jetted from the nozzle portion are mixed, a pressure of the mixed refrigerant being increased in the pressure increasing portion. In the flow-out side refrigerant passage, the refrigerant flowing out of the pressure increasing portion performs heat exchange while flowing. In the suction side refrigerant passage, the refrigerant that is to be drawn through the refrigerant suction port performs heat exchange while flowing. Multiple tube forming members are arranged such that the refrigerant flows in parallel with each other.

Ejector-integrated heat exchanger

In an ejector refrigeration cycle, an inlet of a nozzle portion of an ejector is connected to a refrigerant outlet side of a high-stage side evaporator, a refrigerant suction port of the ejector is connected to a refrigerant outlet side of a low-stage side evaporator, and an internal heat exchanger is provided for exchanging heat between a high-pressure refrigerant flowing into a low-stage side throttle device for decompressing the refrigerant flowing into the low-stage side evaporator, and a low-stage side low-pressure refrigerant flowing out of the low-stage side evaporator. Because a difference in enthalpy between the inlet and outlet of the low-stage side evaporator can be enlarged, the cooling capacities exhibited by the respective evaporators can be adjusted to be closer to each other even if the flow-rate ratio Ge/Gn of the suction refrigerant flow rate Ge to the injection refrigerant flow rate Gn is set to a relatively small value so as to make it possible to improve the COP of the cycle.

Growing community of inventors

Kariya, Japan

Hiroya Hasegawa