An air-conditioning apparatus is capable of completing heat medium freeze prevention control more quickly by performing heat medium temperature rise control for raising the temperature of a cooled heat medium and includes a controller that adjusts a current opening degree of a bypass device at a bypass pipe to an opening degree, and that makes an adjustment such that the flow passage resistance in the case of the opening degree becomes equal to the flow passage resistance in the case of an opening degree before an expansion device is adjusted to a minimum opening degree.

An air-conditioning apparatus includes a temperature sensor for detecting a temperature of the heat medium sent from each of the intermediate heat exchangers to each of the use-side heat exchangers, and a temperature of the heat medium that has exited each of the use-side heat exchangers, an opening degree controller for regulating a flow rate of the heat medium through each of the heat medium flow control devices, and a computing unit for computing a usage capacity of each of the indoor units from a rotation speed of the pump, an opening degree of each of the heat medium flow control devices, temperatures detected by the temperature sensors, and power consumption of each of the indoor units, and proportionally dividing the power consumption for a common portion among each of the indoor units based on the computed usage capacity and the power consumption of the common portion.

A multi-split air-conditioner and an outdoor unit system thereof are provided. The outdoor unit system includes: a compressor (1) having a gas outlet (a) and a gas inlet (b); an outdoor heat exchanger (2) having an inlet (c) and an outlet (d); a switching assembly (3) having first to sixth ports, wherein the first port (e) is connected with the gas outlet (a) of the compressor (1), the second port (f) is connected with the gas inlet (b) of the compressor (1), the third port (g) is connected with the inlet (c) of the outdoor heat exchanger (2), the fourth port (h) is connected with the outlet (d) of the outdoor heat exchanger (2), the fifth port (i) is connected with an inlet pipe (4) and the sixth port (j) is connected with an outlet pipe (5).

An air-conditioning apparatus includes a refrigeration cycle and an internal heat exchanger. With the refrigeration cycle, both a cooling operation and a heating operation can be performed. The internal heat exchanger includes a first flow passage guiding refrigerant flowing between an evaporator and a compressor, a second flow passage guiding the refrigerant flowing between an outdoor heat exchanger and an expansion device, a third flow passage guiding the refrigerant flowing between the expansion device and an indoor heat exchanger. The internal heat exchanger is configured to exchange heat between the refrigerant flowing through the first flow passage and the refrigerant flowing through the second flow passage in the cooling operation, and exchange heat between the refrigerant flowing through the first flow passage and the refrigerant flowing through the third flow passage in the heating operation.

An air conditioning system including a four-way valve including a first port, a second port, a third port and a fourth port, at least the first port and the third port are fluidly isolated; a compressor, an output end and an input end of which are in communication with the first port and the third port respectively; a first evaporator, a first end of which is in communication with the third port; a second evaporator and a condenser, first ends of which are in communication with one of the second port and the fourth port respectively; wherein a second end of the condenser, a second end of the first evaporator, and a second end of the second evaporator are in communication at a first node, and a first throttling valve, a second throttling valve and a third throttling valve are respectively disposed between the condenser and the first node.

A cycle enhancement apparatus is provided. The apparatus has a first side entrance line and exit line, both connected to a first side of a refrigerant line, and a second side entrance line and exit line, both connected to a second side of the refrigerant line. One-way valves prevent flow through the first side entrance line toward the first side, through the first side exit line away from the first side, through the second side entrance line toward the second side, and through the second side exit line away from the second side. The apparatus has a cycle enhancement line. The cycle enhancement line has an entrance portion, connected to the first side entrance line and the second side entrance line, an exit portion, connected to the first side exit line and the second side exit line, and a cycle enhancement between the entrance portion and the exit portion.

An air-conditioning apparatus includes a high-pressure side pressure detection device detecting high-pressure side pressure, a low-pressure side pressure detection device detecting low-pressure side pressure, a high-low pressure bypass pipe connecting a pipe on a discharge side of a compressor and a pipe on a suction side of the compressor, a bypass expansion device disposed in the high-low pressure bypass pipe, a high-pressure side temperature detection device detecting high-pressure side temperature, and a low-pressure side temperature detection device detecting low-pressure side temperature; an outdoor unit side controller that detects circulation composition of refrigerant on the basis of the high-pressure side pressure, the low-pressure side pressure, the high-pressure side temperature, and the low-pressure side temperature; and a relay unit side controller performing at least one of a calculation of evaporating temperature and degree of superheat, and a calculation of condensing temperature and degree of subcooling on the basis of the circulation composition.

An air-conditioning apparatus includes a refrigerant circuit in which a compressor, a heat-source-side heat exchanger, an expansion device, and a refrigerant flow path in at least one intermediate heat exchanger are connected by a refrigerant pipe, and a heat medium circuit in which a pump, a use-side heat exchanger, and a heat-medium flow path in the at least one intermediate heat exchanger are connected by a heat-medium conveying pipe, the heat medium circuit being configured to cause a heat medium to circulate therethrough. The at least one intermediate heat exchanger comprises a plurality of intermediate heat exchangers. The plurality of intermediate heat exchangers are operative in a heating only operation mode, a cooling only operation mode, and a cooling and heating mixed operation mode in which some of the intermediate heat exchangers serve as the condenser and others of the intermediate heat exchangers serve as the evaporator.

An air conditioner (100), comprising a compressor (110), a reversing assembly (120), an outdoor heat exchanger (130), an indoor heat exchanger (140), an electric control heat sink assembly (150), a first unidirectional throttle valve (160) and a second unidirectional throttle valve (160′). The electric control heat sink assembly (150) comprises an electric control component (151) and a heat dissipation assembly (152). The first unidirectional throttle valve (160), on the flow direction from a first valve port (161) to a second valve port (162), is completely turned on. On the flow direction from the second valve port (162) to the first valve port (161), the first unidirectional throttle valve (160) is a throttle component. The second unidirectional throttle valve (160′), on the flow direction from a third valve port (161′) to a fourth valve port (162′), is completely turned on. On the flow direction from the fourth valve port (162′) to the third valve port (161′), the second unidirectional throttle valve (160′) is a throttle component.

An air conditioner (100), comprising a compressor (110), a reversing assembly (120), an outdoor heat exchanger (130), an indoor heat exchanger (140), an electric control heat sink assembly (150), a unidirectional throttle valve (160) and a throttle component (170). The unidirectional throttle valve (160) comprises a first valve port (161) and a second valve port (162), on the flow direction from the first valve port (161) to the second valve port (162), the unidirectional throttle valve (170) is fully turned on, and on the flow direction from the second valve port (162) to the first valve port (161), the unidirectional throttle valve (170) is a throttle valve.