Patent ID: 11959672
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
1. An air-conditioning apparatus comprising:
a compressor having a suction port configured to suck refrigerant and a discharge port configured to discharge the refrigerant;
an indoor heat exchanger that is connected to the discharge port of the compressor and functions as a condenser at a time of a heating operation;
an outdoor heat exchanger that is connected to the suction port of the compressor and functions as an evaporator at the time of the heating operation;
a bypass pipe connected to the discharge port of the compressor;
a flow switching device provided between the bypass pipe and the outdoor heat exchanger;
an indoor fan that sends air to the indoor heat exchanger;
a temperature detection unit configured to detect a temperature of the indoor heat exchanger; and
a controller,
wherein
the outdoor heat exchanger includes a first heat exchanger and a second heat exchanger, in which refrigerant flow paths are independent of each other,
the flow switching device switches between connection and disconnection between the first heat exchanger and the bypass pipe and switches between connection and disconnection between the second heat exchanger and the bypass pipe in accordance with a control signal from the controller, and
the controller is configured to perform
a heating-defrosting operation, in which one out of the first heat exchanger and the second heat exchanger is caused to function as an evaporator, an other one out of the first heat exchanger and the second heat exchanger is caused to function as a condenser, and the indoor heat exchanger is caused to function as a condenser,
wherein
when a temperature of the indoor heat exchanger detected at a time of a start of the heating-defrosting operation by the temperature detection unit is treated as a first temperature, and
a temperature of the indoor heat exchanger detected during the heating-defrosting operation by the temperature detection unit is treated as a second temperature,
the controller is configured to reduce a rotation speed of the indoor fan from a rotation speed of the indoor fan at the time of the start of the heating-defrosting operation in a case where the second temperature is lower than the first temperature and where a difference between the first temperature and the second temperature is greater than or equal to a first setting value during the heating-defrosting operation, and in other cases, the rotation speed of the indoor fan at the time of the start of the heating-defrosting operation is maintained.