Mitsubishi Electric Corporation

Chitose Tanaka

Kosuke Tanaka

Takuya Matsuda

Kazunori Sakanobe

Kenta Yuasa

So Nomoto

Yasuhiko Wada

A refrigerating and air-conditioning apparatus performs a defrosting operation. The refrigerating and air-conditioning apparatus includes a refrigerant circuit, a temperature sensor, and a heat generation control unit. In the refrigerant circuit, a compressor, a first heat exchanger, an expansion device, a second heat exchanger, and a four-way valve are connected to each other by pipes to allow refrigerant to circulate through the refrigerant circuit. The temperature sensor measures a temperature of the compressor. The heat generation control unit increases a temperature of the compressor when the heat generation control unit detects a decrease in a value measured by the temperature sensor in a defrosting operation performed on the first heat exchanger.

Refrigerating and air-conditioning apparatus

A refrigeration cycle apparatus includes: a first refrigerant route; and a second refrigerant route. In the first refrigerant route, refrigerant flows in order of a compressor, a first heat exchanger, a first pipe, a second heat exchanger, a low pressure receiver and the compressor. The second refrigerant route is connected to the first pipe and the low pressure receiver, the first pipe being connected to the first heat exchanger and the second heat exchanger in the first refrigerant route. The second refrigerant route includes an electric pump. The electric pump is configured to flow the refrigerant from the low pressure receiver to the first pipe.

Refrigeration cycle apparatus

A refrigeration cycle apparatus includes: an outdoor unit; a branch unit connected to the outdoor unit via a first pipe and a second pipe; a first indoor unit connected to the branch unit via a third pipe and a fourth pipe; and a second indoor unit connected to the branch unit via a fifth pipe and a sixth pipe. A refrigerant circuit includes a compressor, a first heat exchanger, a second heat exchanger, a third heat exchanger, and a six-way valve. The six-way valve switches between a first state in which the first heat exchanger acts as a condenser and at least the second heat exchanger acts as an evaporator and a second state in which the first heat exchanger acts as an evaporator and at least the second heat exchanger acts as a condenser.

A refrigeration cycle apparatus causes refrigerant to circulate through a compressor, an indoor heat exchanger, an outdoor heat exchanger, a heat storage body, a first expansion valve, and a second expansion valve. The refrigeration cycle apparatus includes a bypass path and a first on-off valve provided in the bypass path. The bypass path branches off from a first portion that connects the indoor heat exchanger and the first expansion valve in a first refrigerant pipe, and leads to a fourth refrigerant pipe that connects a suction port of the compressor and a four-way valve. The first on-off valve is opened in a defrosting operation.

Refrigeration cycle apparatus with heat storage for use during defrost

A refrigeration cycle device performs a heating operation and a defrosting operation. A refrigerant circulates in opposite directions in the defrosting operation and the heating operation. The refrigeration cycle device includes a compressor, a first heat exchanger and a second heat exchanger, a decompressor, and a flow path switch. In the heating operation, the refrigerant circulates in the order of the compressor, the first heat exchanger, the decompressor, and the second heat exchanger. In the defrosting operation, the refrigerant circulates in the order of the compressor, the second heat exchanger, the decompressor, and the first heat exchanger. The defrosting operation includes a first mode and a second mode. The opening of the decompressor is greater in the first mode than in the heating operation. The opening of the decompressor is less in the second mode than in the first mode.

Refrigeration cycle device

A refrigeration cycle apparatus includes a refrigerant circuit in which a compressor, a first heat exchanger, an expansion mechanism, and a second heat exchanger are connected by pipes. The first heat exchanger includes a first refrigerant passage and a second refrigerant passage that share a plurality of fins with each other and provided in parallel in the refrigerant circuit. The apparatus further includes a high-and-low-pressure switching mechanism which is located on an inlet side of the second refrigerant passage of the first heat exchanger in flowing of refrigerant in an operation in which the first heat exchanger functions as a condenser, and which performs switching between flow directions of the refrigerant. The apparatus further includes a refrigerant blocking mechanism located on an outlet side of the second refrigerant passage of the first heat exchanger in the flowing of the refrigerant in the operation, and which blocks the flowing of the refrigerant.

A refrigerant circuit of a refrigeration cycle apparatus has a compressor, a cooling-heating switching mechanism, a condenser, a refrigerant expansion mechanism, and an evaporator. During operation of the compressor, the refrigerant expansion mechanism opens the refrigerant circuit, a first three-way valve connects an outlet of the compressor to the condenser, and a second three-way valve connects an inlet of the compressor to the evaporator. During stop of the compressor, the refrigerant expansion mechanism closes the refrigerant circuit, the first three-way valve connects the outlet of the compressor to the evaporator, and the second three-way valve connects the inlet of the compressor to the evaporator.

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Tokyo, Japan

Chitose Tanaka