JP2010064559A - Vehicular air-conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular air-conditioner capable of demonstrating dehumidifying and heating function with excellent energy efficiency. <P>SOLUTION: The vehicular air-conditioner includes an air-conditioning unit 10 for cooling or heating the inside of a cabin, and a dehumidifying unit 50 of a separate system independent from the air-conditioning unit 10. The dehumidifying unit 50 includes a cooler core 51 (a second heat exchanger inside the cabin) arranged in an upstream part from a mix door 25 out of flow passages inside an air-conditioning duct 20, an outdoor unit 52 for dehumidification (a second heat exchanger outside the cabin) arranged outside the cabin, a liquid refrigerant pipe 54 forming a passage for circulating liquid refrigerant 53 which is not frozen to a predetermined temperature below zero Celsius in the cooler core 51 and the outdoor unit 52 for dehumidification, and a pump 55 which is provided on a part of the passage of one liquid refrigerant pipe 54a out of the liquid refrigerant pipes 54 to circulate the liquid refrigerant 53. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle air conditioner, and more particularly to a vehicle air conditioner that exhibits a dehumidifying heating function.

  In general, in a vehicle air conditioner, when a vehicle interior is heated by heating, high-temperature engine cooling water is circulated to a heater core, and heating is performed by heating air using the engine cooling water as a heat source in the heater core.

  By the way, when setting the outside air introduction mode at the time of heating, there is a concern that exhaust gas may enter the passenger compartment when there is traffic jam in the tunnel, etc. It may be unsuitable to introduce outside air.

  Further, when the outside air temperature is low, for example, -20 degrees Celsius, the heater core cannot sufficiently perform the warming of the cold air due to the introduction of the outside air to the temperature of blowing into the vehicle interior (for example, around 50 degrees Celsius). Sometimes.

  In these cases, it is necessary to set the inside-air circulation mode during heating. However, when heating operation is performed in the inside-air circulation mode, high-humidity air from the breath of the occupant circulates. There is a problem that the window of the room is cloudy.

  For this reason, the technique regarding the vehicle air conditioner which exhibits a dehumidification heating function is proposed conventionally (patent document 1).

According to the technique disclosed in Patent Literature 1, an air conditioner is operated by operating an air conditioning refrigeration cycle (a cycle in which refrigerant gas or liquid refrigerant is circulated through a compressor, a condenser, an expansion valve, and an evaporator). In the evaporator, the sucked air is cooled and dehumidified, and then the sucked air is reheated by the heater core to form warm air, and the warm air is blown into the vehicle interior to realize dehumidification heating in the vehicle interior.
JP 2001-287532 A

  However, the technique disclosed in Patent Document 1 described above operates a refrigeration cycle for air conditioning in order to perform dehumidification, and in spite of the situation of using heating, heating is performed while substantially performing cooling operation. There is a problem that the energy efficiency is poor because of the operation.

  This invention is made | formed in view of the said situation, and it aims at providing the vehicle air conditioner which can exhibit a dehumidification heating function efficiently.

  The vehicle air conditioner according to the present invention includes a dehumidifying unit of a separate system independent of the air conditioning unit, in addition to the air conditioning unit that performs cooling operation and heating operation, and can perform dehumidification in this dehumidifying unit. When performing dehumidification, it is not necessary to operate an air-conditioning refrigeration cycle, and an energy-efficient dehumidifying heating function can be exhibited.

That is, the vehicle air-conditioning apparatus according to the present invention includes a first heat exchanger outside the passenger compartment that is disposed outside the passenger compartment, a first heat exchanger that is disposed in the passenger compartment, and a gas compressor that compresses the refrigerant gas. An expansion valve that depressurizes the liquid refrigerant liquefied by the refrigerant gas, a heater core disposed in a downstream portion of the vehicle interior first heat exchanger, a ratio of air heated by the heater core and air bypassing the heater core A mix door for adjusting the temperature, a pipe serving as a passage for circulating the refrigerant gas or the liquid refrigerant to the first heat exchanger outside the vehicle interior, the expansion valve, the first heat exchanger in the vehicle interior, and the gas compressor. An air conditioning unit, and
The vehicle interior second heat exchanger disposed in the upstream portion of the mix door, the vehicle exterior second heat exchanger disposed outside the vehicle interior, the vehicle exterior second heat exchanger, and the vehicle interior second The heat exchanger is provided with a refrigerant liquid pipe serving as a passage through which the non-freezing refrigerant liquid is circulated to a predetermined temperature of 0 degrees Celsius or less, and is provided in a part of the passage of the refrigerant liquid pipe to circulate the refrigerant liquid. And a dehumidifying unit of a separate system independent of the air conditioning unit.

  According to the vehicle air conditioner of the present invention configured as described above, the non-freezing refrigerant liquid exchanges heat with the outside air having a temperature lower than that of the air inside the vehicle compartment in the second heat exchanger outside the vehicle compartment. It becomes low temperature. And a low-temperature refrigerant | coolant liquid flows in into the vehicle interior 2nd heat exchanger arrange | positioned in an upstream part rather than a mix door, and cools and dehumidifies the suction | inhalation air by which internal air was circulated.

  Further, the sucked air that has been dehumidified by cooling is reheated by the heater core to become warm air and blown out into the passenger compartment to realize dehumidifying heating in the passenger compartment.

  Therefore, the air conditioning refrigeration cycle (cycle in which refrigerant gas or liquid refrigerant is circulated through the first heat exchanger in the vehicle interior, the gas compressor, the first heat exchanger outside the vehicle interior and the expansion valve) in the air conditioning unit is operated. Since dehumidification can be performed, the dehumidifying heating function can be exhibited with high energy efficiency.

  In addition, since this dehumidification part is another system independent from the air conditioning part, it is not necessary to redesign control of an air conditioning part, and a dehumidification part can also be easily installed in the existing air conditioning part.

  In addition, since the refrigerant liquid circulating in the system of the dehumidifying part does not freeze to a predetermined temperature of 0 degrees Celsius or lower, even when the temperature outside the passenger compartment is 0 degrees Celsius or lower in a situation where the passenger compartment is heated, The circulation of the refrigerant liquid does not stagnate in the system of the part, and the system of the dehumidifying part can also function properly.

  In particular, when the temperature outside the passenger compartment is very low, for example, below -20 degrees Celsius, it is necessary to warm the passenger compartment with heating so that passengers can comfortably spend in the passenger compartment. If heating is continued, the humidity in the passenger compartment increases and the window glass becomes cloudy due to condensation.However, dehumidification by the dehumidifying section reduces the humidity in the passenger compartment, making it difficult for condensation on the window glass to occur. , Window fogging can be eliminated or prevented.

  As the refrigerant liquid circulating in the system of the dehumidifying unit, for example, an LLC (long life coolant) mainly composed of ethylene glycol or the like, which is an antifreeze liquid for an engine, can be applied.

  Furthermore, in the vehicle air conditioner according to the present invention, the second heat exchanger outside the passenger compartment is more than the first heat exchanger outside the passenger compartment among the air flow paths blown to the first heat exchanger outside the passenger compartment. Is also preferably arranged in the upstream part.

  According to the vehicle air-conditioning apparatus of the present invention having such a preferable configuration, since the cold air of the outside air is in contact with the second heat exchanger outside the passenger compartment without being obstructed by the first heat exchanger outside the passenger compartment, Heat exchange between the refrigerant liquid and the cold air in the two heat exchangers is facilitated, and the cooling and dehumidifying function can be further improved.

  Moreover, in the vehicle air conditioner according to the present invention, it is preferable that the refrigerant liquid is a liquid mixed with an antifreeze liquid adjusted to antifreeze to a temperature of −20 degrees Celsius or lower.

  According to the vehicle air conditioner of the present invention having such a preferable configuration, the liquid mixed with the antifreeze adjusted to antifreeze to a temperature of -20 degrees Celsius or lower is conventionally used as the coolant for the vehicle engine. Since it is more widespread, it is inexpensive and easy to obtain.

  Further, in the vehicle air conditioner according to the present invention, the pump operates in an inside air circulation mode in which the air conditioning unit is switched to an operation of heating the vehicle interior and circulates air in the vehicle interior. It is preferable that the refrigerant liquid is set to circulate only when it is being used.

  When the air conditioning unit is switched to the operation for heating the vehicle interior and is operated in the inside air circulation mode for circulating the air in the vehicle interior, the humidity in the vehicle interior is likely to increase.

  On the other hand, when the air conditioning unit is heating in the outside air introduction mode, the air in the vehicle interior is always replaced with the outside air, so the humidity in the vehicle interior is lower than when operating in the inside air circulation mode. The window is not cloudy.

  Similarly, when the air conditioning unit is switched to the operation of cooling the vehicle interior (it is considered that the possibility of selecting the operation of cooling the vehicle interior when the temperature outside the vehicle is cold is very low). The first heat exchanger in the passenger compartment exhibits a dehumidifying function, so that the humidity in the passenger compartment is less likely to increase and window fogging is less likely to occur.

  As described above, according to the vehicle air conditioner of the present invention having a preferred configuration, the air conditioning unit is switched to the operation of heating the vehicle interior and is operated in the inside air circulation mode for circulating the air in the vehicle interior. Only by operating the pump and circulating the refrigerant liquid, the drive of the pump is stopped under other conditions where window fogging is unlikely to occur (in the outside air introduction mode or in the cooling or dehumidifying operation by the air conditioning unit), Power saving can be achieved.

  The vehicle air conditioner according to the present invention can exhibit the dehumidifying and heating function with high energy efficiency.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, the best mode for carrying out an air conditioner for vehicles according to the invention will be described with reference to the drawings.

  FIG. 1 is a schematic diagram showing an overall configuration of a vehicle air conditioner 100 for explaining an embodiment of the present invention. The illustrated vehicle air conditioner 100 includes an air conditioning unit 10 that cools or heats a vehicle interior, and a separate dehumidifying unit 50 that is independent from the air conditioning unit 10.

  Here, the air-conditioning unit 10 circulates a refrigerant gas 13 to a liquid refrigerant 13 (hereinafter sometimes simply referred to as the refrigerant 13) to circulate an air-conditioning refrigeration cycle 11 that cools the vehicle interior of the vehicle, and an engine coolant 14. It comprises a heating cycle 12 that circulates and heats the interior of the vehicle.

  In this refrigeration cycle 11 for air conditioning, the compressor 15 (gas compressor) that compresses the refrigerant gas 13, the condenser 16 (first heat exchanger outside the vehicle compartment) disposed outside the vehicle compartment, and the refrigerant gas 13 are liquefied. An expansion valve 17 for reducing the pressure of the liquid refrigerant 13, an evaporator 18 (a vehicle interior first heat exchanger), a compressor 15, a condenser 16, an expansion valve 17 and an evaporator 18 are supplied with a refrigerant gas 13 or a liquid refrigerant. And a pipe 19 serving as a passage through which the gas 13 is circulated.

  Of the air-conditioning refrigeration cycle 11, the evaporator 18 is arranged inside the air-conditioning duct 20 of the vehicle, and is generated by the blower 21 and flows through the air-conditioning duct 20 in the direction indicated by the outlined arrow (air blowing). A2 is blown, heat exchange is performed with this air A2, and the air A2 after the heat exchange is blown into the vehicle interior through an opening provided at the outlet of the air conditioning duct 20 or the like, Cool the room.

  Further, the heating cycle 12 includes an engine cooling between the heater core 22 disposed in the air conditioning duct 20 and in the downstream portion of the evaporator 18, the radiator 23 for cooling the engine, and the heater core 22 and the radiator 23. And a cooling water pipe 24 through which the water 14 is circulated.

  Further, in the air conditioning duct 20, among the air (air blowing) A <b> 2 that flows in the direction of the white arrow in the air conditioning duct 20, the air heated by the heater core 22 and the air that bypasses the heater core 22 and is not heated The mix door 25 which adjusts the ratio of is provided.

  When heating is performed, the high-temperature engine coolant 14 is circulated to the heater core 22, heat exchange is performed with the air A 2 in the heater core 22, and the air A 2 after the heat exchange is used as the air conditioning duct. Air is blown into the vehicle interior through an opening provided at the outlet of the vehicle 20 to heat the vehicle interior.

  Moreover, the dehumidifying part 50 is arrange | positioned outside the vehicle interior with the cooler core 51 (vehicle interior 2nd heat exchanger) arrange | positioned among the flow paths inside the air-conditioning duct 20 in the upstream part from the mix door 25. A dehumidifying outdoor unit 52 (second heat exchanger outside the vehicle compartment), and a refrigerant liquid pipe 54 serving as a passage through which the non-freezing refrigerant liquid 53 circulates in the cooler core 51 and the dehumidifying outdoor unit 52 to a predetermined temperature of 0 ° C. or less. And a pump 55 provided in a part of the refrigerant liquid pipe 54 on the passage of one of the refrigerant liquid pipes 54a to circulate the refrigerant liquid 53.

  In FIG. 1, the dehumidifying indoor unit 52 is shown to be disposed in the downstream portion of the evaporator 18, but if it is upstream of the mix door 25, it is disposed in the upstream portion of the evaporator 18. Also good.

  Here, in the vehicle air conditioner 100 of the present embodiment, as the refrigerant liquid 53, an antifreeze liquid (for example, a long life coolant mainly composed of ethylene glycol or the like) adjusted to antifreeze to a temperature of −20 degrees Celsius or less. ) Mixed liquid (such as engine cooling water) is applied, but the vehicle air conditioner of the present invention is not limited to such a liquid, and is not more than 0 degrees Celsius. As long as the refrigerant liquid is non-freezing up to a predetermined temperature, other various refrigerant liquids can be applied.

  The dehumidifying outdoor unit 52 is disposed upstream of the condenser 16 in the flow path of the air A1 (airflow blown as the vehicle travels) blown to the condenser 16.

  The pump 55 circulates the refrigerant liquid 53 only when the air conditioning unit 10 is switched to the operation of heating the vehicle interior and is operated in the inside air circulation mode for circulating the air in the vehicle interior. It is set so that it does not operate in other states.

  Note that whether the inside air circulation mode is selected or the outside air introduction mode is selected is determined by the state of the mode selection button in which an operation for selecting one of these is input. It can be set by detecting (a state in which the inside air circulation mode is selected or a state in which the outside air introduction mode is selected).

  Further, in the case of the vehicle air conditioner 100 having a configuration in which a signal representing the state is not directly detected but is input to a control device (not shown), the mode selection button is input to the control device. It is also possible to set based on the signal.

  Next, the effect | action of the vehicle air conditioner 100 of this embodiment is demonstrated.

  First, when the vehicle interior is cooled, the refrigerant 13 circulates in the order of the compressor 15 → the condenser 16 → the expansion valve 17 → the evaporator 18 → the compressor 15. Thereby, in the evaporator 18, heat exchange is performed between the low-temperature / low-pressure liquid refrigerant 13 and the air A2 blown from the blower 21, and the air A2 cooled by the evaporator 18 is blown into the vehicle interior. Thus, the passenger compartment is cooled.

  At this time, since the pump 55 of the dehumidifying unit 50 is not operated, the refrigerant liquid 53 in the cooler core 51 does not perform any work thermally against the air A2 to be blown.

Note that the air conditioner 10 may adopt a configuration in which the pump 55 is operated when the vehicle interior is in a state of cooling the vehicle interior. However, when the vehicle interior is being cooled, the temperature outside the vehicle interior is high. In many cases, when the vehicle is stopped, the air A1 is not blown to the dehumidifying outdoor unit 52. Therefore, the temperature of the refrigerant liquid 53 in the dehumidifying outdoor unit 52 rises until it is in equilibrium with the outside air temperature of the passenger compartment. To do.

  When the pump 55 is activated, the refrigerant liquid 53 whose temperature has risen in such a manner flows into the cooler core 51. Therefore, there is a high possibility that the air A2 blown to the cooler core 51 will be warmed, which may be contrary to the action of cooling the passenger compartment. is there.

  However, as in the present embodiment, the pump 55 is only operated when the air conditioning unit 10 is switched to the operation of heating the vehicle interior and in the inside air circulation mode for circulating the air in the vehicle interior. In the configuration in which the refrigerant liquid 53 is circulated, such a possibility is avoided, so that the vehicle interior can be comfortably cooled and power saving can be achieved.

  However, when the vehicle is traveling, the air A1 is blown to the dehumidifying outdoor unit 52, so the temperature of the refrigerant liquid 53 in the dehumidifying outdoor unit 52 is lower than the outside air temperature. In this case, the pump Even when 55 is operated, the refrigerant liquid 53 having a temperature lower than the outside air temperature flows into the cooler core 51, and an effect of cooling the air A2 blown to the cooler core 51 is slightly observed, thereby assisting the cooling of the vehicle interior. Can do.

  Therefore, the pump 55 may be operated even when the passenger compartment is cooled. In this case, that is, when the vehicle interior is in a cooling state, the vehicle speed sensor or the like is used to detect that the vehicle is running (air A1 is blown to the dehumidifying outdoor unit 52). Only the pump 55 is preferably activated.

  Furthermore, in this case, when the air A2 is blown onto the cooler core 51 and when the air A2 is blown onto the evaporator 18, the air A2 is more easily cooled when blown onto the evaporator 18. For this reason, the cooler core 51 is preferably arranged on the upstream side of the evaporator 18.

  Next, when heating the vehicle interior, the engine coolant 14 circulates between the heater core 22 and the radiator 23 through the coolant pipe 24. The high-temperature engine coolant 14 exchanges heat with the air A2 blown from the blower 21 in the heater core 22, and the air A2 warmed by the heater core 22 is blown into the vehicle interior. Heated.

  At this time, if the inside air circulation mode is selected, the air A2 blown out from the blower 21 is warmed air in the passenger compartment, and thus is higher than the outside air temperature.

  On the other hand, since the dehumidifying outdoor unit 52 of the dehumidifying unit 50 is disposed outside the vehicle compartment, the temperature of the refrigerant liquid 53 passing through the dehumidifying outdoor unit 52 is lower than that in the vehicle interior.

  And when it is the driving | running state which performs heating, and it is operate | moving in the inside air circulation mode, since it is set so that the pump 55 of the dehumidification part 50 may operate | move, The refrigerant liquid 53 cooled by 52 flows into the cooler core 51 through the refrigerant liquid pipe 54a.

  Here, the air A <b> 2 blown out from the blower 21 is blown to the cooler core 51 on the upstream side of the mix door 25 in the air conditioning duct 20.

  The temperature of the air A2 blown out from the blower 21 is not much different from the temperature in the passenger compartment in the inside air circulation mode, so the temperature is higher than the refrigerant liquid 53 inside the cooler core 51, and therefore the air A2 blown to the cooler core 51 is While being cooled by heat exchange with the refrigerant liquid 53 inside the cooler core 51, it is dehumidified by the cooler core 51.

  The air A2 after being dehumidified by the cooler core 51 is warmed by the heater core 22 disposed on the downstream side of the cooler core 51, and the vehicle interior is heated while being dehumidified.

  Therefore, it is not necessary to operate the air-conditioning refrigeration cycle 11 to cool the air A2 for dehumidification, and dehumidification can be performed only by operating the pump 55.

  In order to operate the air-conditioning refrigeration cycle 11 to cool the air A2, it is necessary to operate the compressor 15 to compress the refrigerant gas 13 and to circulate the refrigerant gas 13 to the liquid refrigerant 13, and the pump 55 of the dehumidifying unit 50 It requires a lot of energy compared to the case of operating only.

  Therefore, according to the vehicle air conditioner 100 according to the present embodiment, dehumidification heating can be performed with high energy efficiency.

  In addition, the refrigerant liquid 53 heated by the heat exchange with the air A2 in the cooler core 51 is returned to the dehumidifying outdoor unit 52 through the refrigerant liquid pipe 54b, and the cold air A1 outside the vehicle blown to the dehumidifying outdoor unit 52 and The refrigerant liquid 53 is circulated to the cooler core 51 after being heat-exchanged and cooled. That is, the dehumidifying unit 50 is configured by a refrigeration cycle completely independent from the air conditioning unit 10.

  Since the dehumidifying unit 50 is a separate system independent of the air conditioning unit 10 as described above, it is possible to eliminate the influence on the control of the air conditioning unit 10 using the refrigerant 13 (temperature control in the vehicle interior).

  Therefore, it is not necessary to redesign the control of the air conditioning unit 10, and the dehumidifying unit 50 can be easily and additionally installed in the existing air conditioning unit 10.

  Further, since the refrigerant liquid 53 circulating in the system of the dehumidifying unit 50 does not freeze to a predetermined temperature of 0 degrees Celsius or less, even when the temperature outside the vehicle interior is 0 degrees Celsius or less in a situation where the passenger compartment is heated. The circulation of the refrigerant liquid 53 does not stagnate within the system of the dehumidifying unit 50, and the system of the dehumidifying unit 50 can function properly.

In particular, since the refrigerant liquid 53 of the dehumidifying unit 50 in the present embodiment is a liquid mixed with antifreeze liquid adjusted to antifreeze to a temperature of -20 degrees Celsius or less, when the temperature outside the passenger compartment is very low, For example, the dehumidifying unit 50 can be appropriately operated even in a cold region of -20 degrees Celsius or less.

  Further, since the dehumidifying outdoor unit 52 is disposed upstream of the condenser 16 in the flow path of the air A1 (airflow blown as the vehicle travels) blown to the condenser 16, the vehicle travels. In this case, the cold air A1 outside the vehicle is directly blown to the dehumidifying outdoor unit 52 without being blocked by the condenser 16.

  For this reason, since the refrigerant liquid 53 inside the dehumidifying outdoor unit 52 is cooled to a lower temperature and circulates in the heater core 51, the air A2 can be efficiently cooled and dehumidified.

  Even when the vehicle interior is heated, the pump 55 is set not to operate in the outside air introduction mode instead of the inside air circulation mode. In such an outside air introduction mode, the air inside the passenger compartment is always replaced with the air outside the passenger compartment, and the humidity of the air inside the passenger compartment does not become much higher than the humidity of the air outside the passenger compartment. Indoor window fogging is unlikely to occur.

  Therefore, it is possible to save power by not operating the pump 55 under such a situation that window fogging hardly occurs.

  In this embodiment, the case where the heating operation is performed using the engine cooling water 14 as a heat source has been described. However, a hot water generating device is provided instead of the radiator 23 for cooling the engine, and hot water generation is performed instead of the engine cooling water 14. The present invention can also be applied to a vehicle air conditioner configured to perform a heating operation using hot water generated by the apparatus as a heat source.

1 is a schematic diagram illustrating an overall configuration of a vehicle air conditioner 100 for describing an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Air conditioning part 11 Air-conditioning refrigerating cycle 12 Heating cycle 13 Refrigerant (refrigerant gas, liquid refrigerant)
14 Engine cooling water 15 Compressor (gas compressor)
16 Condenser (First heat exchanger outside the passenger compartment)
17 Expansion valve 18 Evaporator (vehicle compartment first heat exchanger)
19 Piping 20 Air-conditioning duct 21 Blower 22 Heater core 23 Radiator 24 Cooling water piping 25 Mix door 50 Dehumidifying part 51 Cooler core (vehicle interior second heat exchanger)
52 Dehumidifier outdoor unit (second heat exchanger outside the vehicle compartment)
53 Refrigerant liquid 54, 54a, 54b Refrigerant liquid piping 55 Pump 100 Vehicle air conditioner A1, A2 Air

Claims (4)

A first heat exchanger outside the passenger compartment arranged outside the passenger compartment, a first heat exchanger inside the passenger compartment located inside the passenger compartment, a gas compressor that compresses the refrigerant gas, and the pressure of the liquid refrigerant liquefied by the refrigerant gas An expansion valve, a heater core disposed in a downstream portion of the first heat exchanger in the vehicle interior, a mix door that adjusts a ratio of air heated by the heater core and air bypassing the heater core, and those outside the vehicle interior An air-conditioning unit having one heat exchanger, the expansion valve, the first heat exchanger in the vehicle interior, and a pipe serving as a passage for circulating the refrigerant gas to the liquid refrigerant in the gas compressor, and
The vehicle interior second heat exchanger disposed in the upstream portion of the mix door, the vehicle exterior second heat exchanger disposed outside the vehicle interior, the vehicle exterior second heat exchanger, and the vehicle interior second The heat exchanger is provided with a refrigerant liquid pipe serving as a passage through which the non-freezing refrigerant liquid is circulated to a predetermined temperature of 0 degrees Celsius or less, and is provided in a part of the passage of the refrigerant liquid pipe to circulate the refrigerant liquid. A vehicle air conditioner comprising: a separate dehumidifying unit that is independent of the air conditioning unit and has a pump.   The second exterior heat exchanger is disposed upstream of the first exterior heat exchanger in a flow path of air blown to the first exterior heat exchanger. Item 2. The vehicle air conditioner according to Item 1.   3. The vehicle air conditioner according to claim 1, wherein the refrigerant liquid is a liquid mixed with an antifreeze liquid adjusted to be antifreeze to a temperature of −20 degrees Celsius or lower.   The pump circulates the refrigerant liquid only when the air conditioning unit is switched to an operation for heating the vehicle interior and is operated in an inside air circulation mode for circulating air in the vehicle interior. The vehicle air conditioner according to any one of claims 1 to 3, wherein the air conditioner is set as described above.

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