An air conditioner is provided that may include a defrosting bypass valve disposed at a defrosting bypass pipe having a first end connected to a middle point of the outdoor heat exchanger and a second end connected to an inlet pipe of a compressor, and a processor configured to open and close the defrosting bypass valve according to a temperature of a refrigerant in an outdoor heat exchanger. At a beginning of a defrosting operation, the processor may open the defrosting bypass valve to bypass a portion of the refrigerant in the outdoor heat exchanger to the inlet pipe of the compressor, and if the temperature of the refrigerant in the outdoor heat exchanger exceeds a predetermined temperature, the processor may close the defrosting bypass valve, thereby achieving defrosting performance at an early stage of the defrosting operation.

An air conditioning apparatus may include an outdoor unit through which a first fluid, such as refrigerant circulates, an indoor unit through which a second fluid, such as water circulates, a heat exchange device which is configured to connect the outdoor unit to the indoor unit and in which the first fluid and the second fluid are heat-exchanged with each other, a first inner tube which is configured to connect the outdoor unit to the heat exchange device and through which the first fluid at high-pressure flows, a second inner tube which is configured to connect the outdoor unit to the heat exchange device and through which the first fluid at low-pressure flows, and a third inner tube which is configured to connect the outdoor unit to the heat exchange device and through which the first fluid in liquid form flows. The heat exchange device may include a bypass tube configured to bypass the second inner tube and a flow control valve provided in the bypass tube.

A heat source unit for a refrigeration apparatus. The heat source unit includes: a casing; a heat exchanger disposed in an internal space of the casing, and that performs heat exchange between a refrigerant and air; a fan disposed in the internal space of the casing, and that horizontally blows out the air passing through the heat exchanger; a shut-off valve including a valve main body that forms a flow channel where the refrigerant flows, a valve-operating part with a longitudinal axis, and a valve body that is threaded into the valve-operating part and that is movable with respect to the valve-operating part for opening and closing the flow channel; and an above-shut-off-valve member disposed in the casing and above the shut-off valve in a vertical direction of the heat source unit.

A heat source unit for a refrigeration apparatus. The heat source unit includes: a casing; a heat exchanger disposed in an internal space of the casing, and that performs heat exchange between a refrigerant and air; a fan disposed in the internal space of the casing, and that horizontally blows out the air passing through the heat exchanger; a shut-off valve including a valve main body that forms a flow channel where the refrigerant flows, a valve-operating part with a longitudinal axis, and a valve body that is threaded into the valve-operating part and that is movable with respect to the valve-operating part for opening and closing the flow channel; and an above-shut-off-valve member disposed in the casing and above the shut-off valve in a vertical direction of the heat source unit.

A refrigeration cycle apparatus includes a compressor, a refrigerant cooling pipe, a refrigerant-cycle constituent component, a connecting pipe and vibration transmission suppressing portion that is disposed on the connecting pipe that connects the refrigeration-cycle constituent component or the compressor and the refrigerant cooling pipe to each other.

A heat source unit includes: a casing; a heat exchanger; a fan disposed in the casing and that horizontally blows out the air passing through the heat exchanger; a shut-off valve having a connection port that opens in a direction toward either a front-surface side or a rear-surface side of the casing; and peripheral panels that form a front surface, a rear surface, a left-side surface, and a right-side surface of the casing. The peripheral panels include a first portion that forms the right-side surface. The first portion has a first cut-out portion that exposes the shut-off valve to an exterior of the casing such that the shut-off valve is visible from a right side of the casing without removing any intervening structures between the shut-off valve and the right-side surface of the casing.

A heat source unit includes: a casing; a heat exchanger; a fan disposed in the casing and that horizontally blows out the air passing through the heat exchanger; a shut-off valve having a connection port that opens in a direction toward either a front-surface side or a rear-surface side of the casing; and peripheral panels that form a front surface, a rear surface, a left-side surface, and a right-side surface of the casing. The peripheral panels include a first portion that forms the right-side surface. The first portion has a first cut-out portion that exposes the shut-off valve to an exterior of the casing such that the shut-off valve is visible from a right side of the casing without removing any intervening structures between the shut-off valve and the right-side surface of the casing.

The refrigeration cycle apparatus includes a refrigerant circuit, a controller to control the refrigerant circuit, a bypass flow path, and a flow control valve. The bypass flow path communicates between the discharge side of the compressor and the first outdoor heat exchanger or between the discharge side of the compressor and the second outdoor heat exchanger. The flow control valve is provided to the bypass flow path. The refrigerant circuit is configured to be able to perform a heating defrosting simultaneous operation. The heating defrosting simultaneous operation is an operation of supplying part of the refrigerant discharged from the compressor to one of the first outdoor heat exchanger and the second outdoor heat exchanger via the bypass flow path, causing the other of the first outdoor heat exchanger and the second outdoor heat exchanger to serve as an evaporator, and causing the indoor heat exchanger to serve as a condenser.

The refrigeration cycle apparatus includes a refrigerant circuit, a controller to control the refrigerant circuit, a bypass flow path, and a flow control valve. The bypass flow path communicates between the discharge side of the compressor and the first outdoor heat exchanger or between the discharge side of the compressor and the second outdoor heat exchanger. The flow control valve is provided to the bypass flow path. The refrigerant circuit is configured to be able to perform a heating defrosting simultaneous operation. The heating defrosting simultaneous operation is an operation of supplying part of the refrigerant discharged from the compressor to one of the first outdoor heat exchanger and the second outdoor heat exchanger via the bypass flow path, causing the other of the first outdoor heat exchanger and the second outdoor heat exchanger to serve as an evaporator, and causing the indoor heat exchanger to serve as a condenser.

An air conditioner according to an embodiment includes: a compressor configured to compress a refrigerant; an indoor heat exchanger configured to convert a vapor refrigerant into a liquid refrigerant in a heating mode; an outdoor heat exchanger configured to convert a liquid refrigerant into a vapor refrigerant in the heating mode; a main pipe connecting the indoor heat exchanger to the outdoor heat exchanger; an injection pipe branching from the main pipe and connecting to an injection port of the compressor; an injection valve installed on the injection pipe and configured to control a flux of the refrigerant flowing to the injection pipe; and a controller configured to calculate a target discharge superheat (DSH) based on a correlation between a compression coefficient, a compressor frequency, and a DSH that are represented by an operating condition , and control a current DSH based on the target DSH.