When using at least one of heat exchangers related to heat medium that exchange heat between a heat source side refrigerant and a heat medium as an evaporator, in a case where an air-conditioning apparatus has detected, in the heat exchanger related to heat medium that functions as the evaporator, a
When using at least one of heat exchangers related to heat medium that exchange heat between a heat source side refrigerant and a heat medium as an evaporator, in a case where an air-conditioning apparatus has detected, in the heat exchanger related to heat medium that functions as the evaporator, an evaporating temperature of the heat source side refrigerant which causes the temperature of the heat medium passing through this heat exchanger related to heat medium to become equal to or lower than a freezing temperature, the air-conditioning apparatus performs a heat medium anti-freezing operation by blocking entry of the heat source side refrigerant into the heat exchanger related to heat medium that functions as the evaporator, and causing the heat source side refrigerant to flow to a bypass pipe.
대표청구항▼
1. An air-conditioning apparatus comprising: a refrigerant circuit that connects a compressor, a first refrigerant flow switching valve, a plurality of second refrigerant flow switching valves, refrigerant passage of a plurality of heat exchangers related to a heat medium, a plurality of expansion v
1. An air-conditioning apparatus comprising: a refrigerant circuit that connects a compressor, a first refrigerant flow switching valve, a plurality of second refrigerant flow switching valves, refrigerant passage of a plurality of heat exchangers related to a heat medium, a plurality of expansion valves and a heat source side heat exchanger by a refrigerant pipe;a first opening and closing valve provided to the refrigerant pipe;a second opening and closing valve provided to the refrigerant pipe;a heat medium circuit that connects a pump, a plurality of use side heat exchangers and heat medium passage of the plurality of heat exchangers related to the heat medium by a heat medium pipe;a plurality of temperature sensors, each of which is configured to detect an evaporating temperature of refrigerant flowing through a corresponding one of the plurality of heat exchangers related to the heat medium; anda controller configured to control the compressor, the first refrigerant flow switching valve, the plurality of second refrigerant flow switching valves, the pump, the first opening and closing valve and the second opening and closing valve based on the evaporating temperatures detected by the plurality of temperature sensors,wherein the refrigerant pipe includes a first pipe having a one end and an other end, the first pipe bypasses the plurality of heat exchangers related to heat medium and is provided with the second opening and closing valve,a second pipe having a one end connected to the first refrigerant flow switching valve or the heat source side heat exchanger and other ends each connected to corresponding one of the plurality of second refrigerant flow switching valves,a third pipe having a one end connected to the heat source side heat exchanger or the first refrigerant flow switching valve and other ends each connected to corresponding one of the plurality of expansion valves, the third pipe being provided with the first opening and closing valve, anda plurality of fourth pipes each having a one end connected to the third pipe at a position upstream of the first opening and closing valve, and an other end connected to corresponding one of the plurality of second refrigerant flow switching valves,wherein the one end of the first pipe is connected to the second pipe, and the other end of the first pipe is connected to the third pipe at a position between the first opening and closing valve and the plurality of expansion valves,wherein each of the plurality of second refrigerant flow switching valves, corresponding one of the plurality of heat exchangers related to heat medium, and corresponding one of the plurality of expansion valves are connected in series,wherein the first refrigerant flow switching valve is configured to selectively form a first path in which a discharge side of the compressor is fluidly connected to the one end of the third pipe and a suction side of the compressor is fluidly connected to the heat source side heat exchanger, anda second path in which the discharge side of the compressor is fluidly connected to the heat source side heat exchanger and the suction side of the compressor is fluidly connected to the one end of the second pipe,wherein each of the plurality of second refrigerant flow switching valves is configured to selectively form a third path in which the other end of corresponding one of the plurality of fourth pipes is fluidly connected to corresponding one of the plurality of heat exchangers related to the heat medium, anda fourth path in which corresponding one of the other ends of the second pipe is fluidly connected to corresponding one of the plurality of heat exchangers related to the heat medium,wherein the controller is configured to perform a heating only operation in which the controller controls the first refrigerant flow switching valve to form the first path, the plurality of second refrigerant flow switching valves to form the third path, the first opening and closing valve to be closed, and the second opening and closing valve to be opened, wherein in the heating only operation, the plurality of heat exchangers related to heat medium function as radiators,a cooling only operation in which the controller controls the first refrigerant flow switching valve to form the second path, the plurality of second refrigerant flow switching valves to form the fourth path, the first opening and closing valve to be opened, and the second opening and closing valve to be closed, wherein in the cooling only operation, the plurality of heat exchangers related to heat medium function as evaporators,a cooling and heating mixed operation in which the controller controls the first refrigerant flow switching valve to form the first path or the second path, one or more of the plurality of second refrigerant flow switching valves to form the third path, remaining one or more of the plurality of second refrigerant flow switching valves to form the fourth path, the first opening and closing valve and the second opening and closing valve to be closed, wherein in the cooling and heating mixed operation, the one or more of the plurality of heat exchangers related to heat medium functions as a radiator, and the remaining one or more of the plurality of heat exchangers related to heat medium functions as an evaporator,a first heat medium antifreeze operation in which the controller controls the first refrigerant flow switching valve to form the second path, the plurality of second refrigerant flow switching valves to form the fourth path, the first opening and closing valve to be opened, the second opening and closing valve to be opened, and the plurality of expansion valves to be closed, anda second heat medium antifreeze operation in which the controller controls the first refrigerant flow switching valve to form the first path or the second path, one or more of the plurality of second refrigerant flow switching valves to form the third path, remaining one or more of the plurality of second refrigerant flow switching valves to form the fourth path, the first opening and closing valve to be closed, the second opening and closing valve to be opened, and one or more of the plurality of expansion valves connected to the one or more of the plurality of second refrigerant flow switching valves forming the third path to be closed,wherein the controller is configured to start the first heat medium antifreeze operation in a case where the evaporating temperature detected by one of the plurality of temperature sensors is equal to or lower than a first predetermined temperature when the cooling only operation is performed, andstart the second heat medium antifreeze operation in a case where the evaporating temperature detected by one of the plurality of temperature sensors is equal to or lower than a second predetermined temperature when the cooling and heating mixed operation is performed. 2. The air-conditioning apparatus of claim 1, wherein in a case where the evaporating temperature of the heat source side refrigerant in one or more of the plurality of heat exchangers related to the heat medium that functions as the evaporator is dependent on an evaporating temperature of the heat source side heat exchanger, and the evaporating temperature of the heat source side refrigerant is determined by an outside air temperature,the first heat medium anti-freezing operation and the second heat medium anti-freezing operation are executed during a heating main operation of the cooling and heating operation mixed operation in which a heating load is greater than a cooling load. 3. The air-conditioning apparatus of claim 1, wherein in a case where the evaporating temperature of the heat source side refrigerant in one or more of the plurality of heat exchangers related to the heat medium that functions as the evaporator is lowered by throttling operations by the expansion valve,the first heat medium anti-freezing operation and the second heat medium anti-freezing operation are executed during the cooling only operation, or an operation of a cooling main operation of the cooling and heating operation mixed operation in which a cooling load is greater than a heating load. 4. The air-conditioning apparatus of claim 1, wherein: the compressor and the heat source side heat exchanger are accommodated in an outdoor unit;the plurality of heat exchangers related to the heat medium, the expansion valves, and the pump are accommodated in a relay unit;the use side heat exchanger is accommodated in an indoor unit; andthe outdoor unit, the relay unit, and the indoor unit are configured as separate components. 5. The air-conditioning apparatus of claim 1, wherein the controller is configured tostart the first heat medium antifreeze operation in a case where the evaporating temperature detected by one of the plurality of temperature sensors is equal to or lower than the first predetermined temperature for a first period when the cooling only operation is performed, andstart the second heat medium antifreeze operation in a case where the evaporating temperature detected by one of the plurality of temperature sensors is equal to or lower than the second predetermined temperature for a second period when the cooling and heating mixed operation is performed. 6. The air-conditioning apparatus of claim 1, wherein the controller is configured to activate the pump during the first heat medium antifreeze operation and the second heat medium antifreeze operation.
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이 특허에 인용된 특허 (3)
Kunio Iritani JP; Shigeo Numazawa JP; Kenichi Fujiwara JP; Yasushi Yamanaka JP; Akira Isaji JP; Nobunao Suzuki JP, Automotive airconditioner having condenser and evaporator provided within air duct.
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