Daikin Industries, Ltd.

Yoshiki Yamanoi

Kumiko Saeki

Yuta Iyoshi

Yuuta Iyoshi

A refrigeration cycle system includes: a heat source circuit including a secondary-side compressor, a cascade heat exchanger, a secondary-side switching mechanism, and a suction flow path; a plurality of utilization circuits respectively including utilization-side heat exchanger; a first communication pipe; a second communication pipe; a third communication pipe; a connection path; and a first on-off valve. The first communication pipe and the first heat source pipe connect the plurality of utilization-side heat exchangers and the secondary-side switching mechanism. The second communication pipe and the second heat source pipe connect the plurality of utilization-side heat exchangers and suction flow path. The third communication pipe, the fourth heat source pipe, and the fifth heat source pipe connect the plurality of utilization-side heat exchangers and the cascade heat exchanger. The connection path connects the first communication pipe and the second communication pipe. The first on-off valve switches between a state in which the first communication pipe and the second communication pipe connect and a state in which they do not connect.

Refrigeration cycle system, heat source unit, and refrigeration cycle apparatus

A cascade unit and a refrigeration cycle apparatus are capable of cooling an electric component. The cascade unit of the refrigeration cycle apparatus includes a primary-side refrigerant circuit that includes a primary-side heat exchanger and in which a primary-side refrigerant flows, a secondary-side refrigerant circuit that includes a secondary-side compressor and a utilization-side heat exchanger and in which a secondary-side refrigerant flows, and a cascade heat exchanger that causes the primary-side refrigerant and the secondary-side refrigerant to exchange heat with each other, the cascade unit including the secondary-side compressor, the cascade heat exchanger, a first electric component, a second electric component, a third electric component, and an electric component fan, and a cascade casing that accommodates the secondary-side compressor, the first electric component, and the electric component fan.

Cascade unit and refrigeration cycle apparatus

A primary refrigerant circuit allows circulation of a primary refrigerant, the primary refrigerant circuit including a primary compressor, a cascade heat exchanger, a primary receiver, and a primary heat exchanger. A secondary refrigerant circuit allows circulation of a secondary refrigerant, the secondary refrigerant circuit including a secondary compressor, the cascade heat exchanger, and a utilization heat exchanger; a primary casing accommodating the primary compressor; and a heat source casing accommodating the secondary compressor. The receiver is provided outside the primary casing.

Refrigeration cycle system

A valve opening circuit mounted on a heat pump device having a valve on a refrigerant circuit includes a DC electric path to which a DC voltage generated from an AC voltage for normal use is applied, a valve drive circuit that opens and closes the valve by using the DC voltage of the DC electric path, a control unit that acquires a control power source voltage based on the DC voltage of the DC electric path and controls the valve drive circuit, and a power feed port connected to the DC electric path and connectable to a DC power source line provided from outside for emergency. The control unit causes the valve drive circuit to open the valve when the AC voltage is lost and the DC voltage is fed from the DC power source line to the power feed port.

Valve opening circuit and heat pump device

Provided are a refrigerant vessel and a refrigeration cycle apparatus capable of suppressing accumulation of a refrigerating machine oil inside. A secondary-side receiver reserves a refrigerant in a secondary-side refrigerant circuit in which a refrigerant and a refrigerating machine oil circulate, the secondary-side receiver including a vessel body, a first refrigerant pipe connected to the vessel body, and a second refrigerant pipe connected to the vessel body, in which the refrigerating machine oil is incompatible with the refrigerant and has a higher density than the refrigerant, and the second refrigerant pipe extends downward from a bottom part of the vessel body.

Refrigerant vessel and refrigeration cycle apparatus

A primary refrigerant circuit allows circulation of a primary refrigerant and includes a primary compressor, a cascade heat exchanger, a primary heat exchanger, and a primary switching mechanism. A secondary refrigerant circuit allows circulation of a secondary refrigerant and includes a secondary compressor, the cascade heat exchanger, a utilization heat exchanger, and a secondary switching mechanism. The secondary refrigerant circuit includes a bypass flow path connecting a portion between the utilization heat exchanger and the cascade heat exchanger and a suction flow path of the secondary compressor, and a bypass expansion valve provided on the bypass flow path. Executed is defrosting operation of circulating the primary refrigerant in the order of the primary compressor, the primary heat exchanger, and the cascade heat exchanger, and circulating the second refrigerant in the order of the secondary compressor, the cascade heat exchanger, and the bypass flow path.

A refrigeration cycle apparatus includes a primary-side refrigerant circuit in which a first refrigerant circulates and a secondary-side refrigerant circuit in which a second refrigerant circulates. The primary-side refrigerant circuit includes a primary-side compressor, a primary-side flow path of a cascade heat exchanger, a primary-side heat exchanger, and a primary-side switching mechanism. The secondary-side refrigerant circuit includes a secondary-side compressor, a secondary-side flow path of the cascade heat exchanger, a secondary-side switching mechanism, a suction flow path, a plurality of utilization-side heat exchangers, a first connection flow path, connecting the plurality of utilization-side heat exchangers and the secondary-side switching mechanism, including a secondary-side first connection pipe, a first heat source pipe, first branch pipes, junction pipes, first connection pipes, and first utilization pipes, a second connection flow path, connecting the plurality of utilization-side heat exchangers and the suction flow path, including a secondary side second connection pipe, a second heat source pipe, second branch pipes, the junction pipes, the first connection pipes, and the first utilization pipes, a third connection flow path, connecting the plurality of utilization-side heat exchangers and the secondary-side flow path of the cascade heat exchanger, including a secondary-side third connection pipe, a fourth heat source pipe, a fifth heat source pipe, third branch pipes, second connection pipes, and second utilization pipes.

Refrigeration cycle apparatus

An outdoor unitof an air conditionerincludes an outdoor control unithaving a first control mode and a second control mode different from each other as control modes of a refrigerant recovery operation for recovering a refrigerant of a refrigerant circuit. A flow rate of the refrigerant in the refrigerant circuitin the first control mode is larger than a flow rate of the refrigerant in the refrigerant circuitin the second control mode.

Refrigerant recovery control device and refrigerant recovery control system

A safety valve includes a secondary-side refrigerant circuit that includes a secondary-side receiver that reserves a refrigerant, a flow path switching portion that includes a first connecting portion, a second connecting portion, and a third connecting portion connected to the secondary-side receiver, the flow path switching portion () that switches between a first state in which the third connecting portion communicates with the first connecting portion and a second state in which the third connecting portion communicates with the second connecting portion, and a safety valve that includes a safety valve connecting portion connected to the first connecting portion or the second connecting portion, and releases the refrigerant to outside when a refrigerant pressure in the secondary-side receiver satisfies a predetermined condition, in which at least the safety valve connecting portion is made of stainless steel.

A cascade unit is a cascade unit of a refrigeration system including a first circuit, a second circuit, and a cascade heat exchanger. The first circuit includes a first connecting portion that connects a first pipe and a second pipe extending from the cascade heat exchanger, of the first pipe and the second pipe connecting a first heat exchanger and the cascade heat exchanger), to the first pipe and the second pipe extending from the first heat exchanger inside or outside a cascade casing. The second circuit includes a second connecting portion that connects a liquid pipe and gas pipes extending from the cascade heat exchanger, among the liquid pipe and the gas pipes connecting second heat exchangers and the cascade heat exchanger, to the liquid pipe and the gas pipes extending from the second heat exchangers inside or outside the cascade casing.

Cascade unit and refrigeration system

A cascade unit and a refrigeration cycle apparatus are capable of cooling an electric component. A cascade unit of a refrigeration cycle apparatus includes a primary-side refrigerant circuit that includes a primary-side heat exchanger and through which a primary-side refrigerant flows, a secondary-side refrigerant circuit that includes a secondary-side compressor and a utilization-side heat exchanger and through which a secondary-side refrigerant flows, and a cascade heat exchanger that exchanges heat between the primary-side refrigerant and the secondary-side refrigerant, the cascade unit including the secondary-side compressor, the cascade heat exchanger, a first electric component that drives the secondary-side compressor, a first cooling portion that cools the first electric component with the secondary-side refrigerant flowing through the secondary-side refrigerant circuit, a cascade casing that accommodates the secondary-side compressor, the first electric component, and the first cooling portion.

An air-conditioning management system includes: an air conditioning apparatus configured to carry out a refrigerant recovery operation of recovering a refrigerant from a refrigerant circuit that connects an outdoor unit and an indoor unit and sending the recovered refrigerant to each recovery unit of the outdoor unit; and a control unit configured to make a determination whether all the recovered refrigerant is sendable to each recovery unit before a start of the refrigerant recovery operation by the air conditioning apparatus, and to output, when determining that all the recovered refrigerant is not sendable to each recovery unit, a command for notifying the determination.

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Osaka, Japan

Yoshiki Yamanoi