Rear air conditioner for vehicle

Abstract

A rear air conditioner for a vehicle includes: an air conditioner housing; the air blower is arranged in the air conditioner shell and is connected with the air inlet part of the air conditioner shell; a first passage formed between the blower and the inside of the vehicle quadrilateral panel; a side vent hole formed in the first passage and facing the quadrilateral panel; a bypass gate configured to selectively open and close the first passage; a heat exchanger disposed between the bypass door and the side vent hole, and disposed within the first passage; a second passage formed between the blower and the air outlet portion of the air conditioner case; and a controller configured to (i) operate the bypass gate to open the first passage and (ii) operate the heat exchanger based on external environmental conditions of the vehicle in a cooling mode.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a rear air conditioner for a vehicle. Specifically, to prevent condensation from occurring in an electric vehicle, the present disclosure describes an air conditioner designed to prevent condensation from occurring on a quad panel by operating a portion of a heater to heat air drawn in via a blower and then allowing the air to flow into the quad panel. BACKGROUND

[0002] An electric vehicle can not generate waste heat, and condensation can occur on the outside of a quad panel when an air conditioner is operated in a high-temperature humid environment.

[0003] In some examples, a rear air conditioner for a combustion engine vehicle can include several components connected to each other, such as a duct, a heat exchanger, a blower, and a discharge portion. These components are designed to work in conjunction to provide effective cooling or heating for rear seat passengers.

[0004] In some cases, an air conditioner for a vehicle can have both cooling and heating functions. For example, the air conditioner can selectively introduce outdoor or indoor air, cool or heat the air using an internal evaporator, an internal condenser, and a positive temperature coefficient (PTC) heater, and blow it into the interior of the vehicle. The air conditioner can be used in combustion engine vehicles and electric vehicles.

[0005] In some cases, when an air conditioner is operated in a cooling mode in an electric vehicle that has neither an engine nor generates waste heat, the temperature inside the outer panel of the air conditioner can decrease, which can cause condensation to occur on the outside of the outer panel in a high-temperature humid environment. SUMMARY

[0006] The present disclosure describes an air conditioner that prevents condensation from occurring on the outside of a quad panel. In some embodiments, when operated in a cooling mode, a bypass door is operated by a controller to open a passage formed between a blower and the inside of a quad panel. In some embodiments, a portion of a heater included in a heat exchanger is used to heat air drawn in by the blower. The heated air is introduced into the quad panel through the passage, increasing the temperature inside the quad panel to prevent condensation.

[0007] To achieve the above-mentioned object of the present disclosure, a rear air conditioner for a vehicle has the following configuration.

[0008] According to one aspect of the subject matter described herein, a rear air conditioner for a vehicle includes an air conditioner housing including an air intake portion and an air outlet portion, a blower connected to the air intake portion of the air conditioner housing and disposed within the air conditioner housing, a first passage formed between the blower and an inside of a quadrilateral panel, a side vent formed in the first passage and facing the quadrilateral panel, a bypass door configured to selectively open or close the first passage, a heat exchanger disposed between the bypass door and the side vent, a second passage formed between the blower and the air outlet portion, and a controller configured to operate the bypass door to open the first passage and operate the heat exchanger disposed in the first passage based on an external environmental condition in a cooling mode.

[0009] In some embodiments, the rear air conditioner can further include a first bypass door configured to open and close the first passage, and a second bypass door configured to open and close the side vent.

[0010] In some embodiments, the heat exchanger can include a partial regulation heater disposed in the first passage, an evaporator disposed in the second passage, and a heater disposed at a rear end of the evaporator and disposed in at least a portion of the second passage.

[0011] In some embodiments, the controller can operate the partial regulation heater when the external environmental condition is satisfied.

[0012] In some embodiments, the air outlet portion of the air conditioner can include a roof duct disposed in the second passage, and an inner duct disposed in the second passage adjacent to the roof duct.

[0013] In some embodiments, the air outlet portion of the air conditioner can further include a mode door disposed in the second passage and configured to change an opening amount of the inner duct and the roof duct.

[0014] In some embodiments, the heat exchanger can further include a mixing door disposed adjacent to the heater and configured to open and close the mixing door to selectively bypass the heater for air that has passed through the evaporator.

[0015] In some embodiments, the controller can determine whether an outdoor temperature is equal to or greater than a predetermined temperature, whether a solar radiation amount is equal to or less than a predetermined amount, whether a discharge temperature is equal to or less than a predetermined temperature, and whether an outside relative humidity is equal to or greater than a predetermined humidity, with respect to the external environmental condition.

[0016] In some embodiments, the controller can operate the first bypass door and the second bypass door to open the first passage and control the heat exchanger to heat air when the external environmental condition is satisfied.

[0017] According to another aspect, a quadrilateral panel air supplier includes: an air conditioning housing including an air intake portion and an air outlet portion; a blower connected to the air intake portion of the air conditioning housing and disposed within the air conditioning housing; a first passage formed between the blower and an inner side of a quadrilateral panel; a side vent formed within the first passage and facing the quadrilateral panel; a bypass door configured to selectively open or close the first passage; a heat exchanger disposed between the bypass door and the side vent; and a controller configured to operate the bypass door to open the first passage and operate the heat exchanger disposed within the first passage based on an external environmental condition in a cooling mode.

[0018] In some embodiments, the quadrilateral panel air supplier can further include a first bypass door configured to open and close the first passage, and a second bypass door configured to open and close the side vent.

[0019] In some embodiments, the heat exchanger can include a local regulation heater disposed within the first passage.

[0020] In some embodiments, the controller can determine whether an outdoor temperature is equal to or greater than a predetermined temperature, whether a solar radiation amount is equal to or less than a predetermined amount, whether a discharge temperature is equal to or less than a predetermined temperature, and whether an external relative humidity is equal to or greater than a predetermined humidity, with respect to the external environmental condition.

[0021] In some embodiments, the controller can operate the first bypass door and the second bypass door to open the first passage and control the heat exchanger to heat air when the external environmental condition is satisfied. BRIEF DESCRIPTION OF DRAWINGS

[0022] The above and other features of the present disclosure will now be described in detail with reference to certain exemplary embodiments of the present disclosure illustrated in the accompanying drawings, which are given by way of illustration only and thus are not restrictive of the present disclosure.

[0023] Figure 1 is a perspective view illustrating an embodiment of a rear air conditioner for a vehicle.

[0024] Figure 2 is a cross-sectional view illustrating an exemplary operating state of the rear air conditioner in a cooling mode.

[0025] Figure 3 is a cross-sectional view illustrating an operating state of the rear air conditioner in a heating mode.

[0026] Figure 4 illustrates an exemplary state in which heated air is introduced into a quadrilateral panel.

[0027] Figure 5 is a schematic flowchart of an exemplary operation of the rear air conditioner in the cooling mode.

[0028] Figure 6 is a detailed flowchart of exemplary operation of the rear air conditioner in a cooling mode.

[0029] In the drawings, reference numerals refer to components throughout the several figures of the drawing, and refer to the same or similar components in the present disclosure. DETAILED DESCRIPTION

[0030] One or more embodiments of the present disclosure will be described below in detail with reference to the accompanying drawings. Embodiments of the present disclosure can be modified in various forms, and the scope of the present disclosure should not be construed as being limited to only the following embodiments. These embodiments are provided in order to more completely explain the present invention to those skilled in the art.

[0031] It should be understood that the term "vehicle" or "vehicular" or other similar terms used herein generally include motor vehicles such as passenger cars, SUVs, buses, trucks, various commercial vehicles, watercraft including various boats and ships, aircraft, etc., and includes hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles, and other alternative fuel vehicles (e.g., those that use fuel other than petroleum-based fuels). As used herein, a hybrid vehicle is a vehicle that has two or more sources of power, e.g., a vehicle that is driven by both gasoline and electricity.

[0032] The controller can be implemented as a memory storing an algorithm for controlling operations of various components disposed in the vehicle or data on a program that reproduces the algorithm, and a processor that executes the above-described operations using the data stored in the memory. In some embodiments, the memory and the processor can be implemented as separate chips. Alternatively, the memory and the processor can be implemented as a single chip. For example, the controller can include at least one of an electronic control unit (ECU), a central processing unit (CPU), a micro processing unit (MPU), a micro controller unit (MCU), an application processor (AP), or any type of processor well known in the art to which the present disclosure pertains.

[0033] For example, the application processor (AP) can be a processor configured to perform a function of controlling the rear air conditioner for the vehicle.

[0034] In some embodiments, the controller can be a combination of software and hardware capable of performing calculations for at least one application or program to execute a method according to embodiments of the present disclosure.

[0035] One or more embodiments will be described below in detail with reference to the accompanying drawings, and in the description given with reference to the drawings, the same or corresponding components are given the same reference numerals, and a description thereof will not be repeated.

[0036] Figure 1is a perspective view illustrating a rear air conditioner for a vehicle according to the present disclosure.

[0037] In some embodiments, the rear air conditioner for a vehicle can include an air conditioner housing 100, a blower 110 provided at an air intake portion 111 of the air conditioner housing 100, and a heat exchanger 200 fluidly connected with the blower 110. The rear air conditioner can further include a mode door 180 configured to control an air outlet direction in a cooling / heating mode, and a roof duct 160 and an interior duct 170 for discharging the sucked air. To prevent condensation on a quadrangular panel 400 in the cooling mode, the rear air conditioner can further include a first passage 130 formed between the blower 110 and an inner side of the quadrangular panel 400, a bypass door 300 configured to open or close the first passage 130, and a second passage 140 formed between the blower 110 and an air outlet portion 112 of the air conditioner housing 100. The quadrangular panel 400 is installed in a C-pillar of the vehicle and interacts with the rear air conditioner unit. Specifically, the quadrangular panel is fixed to an inner wall of the C-pillar structure, which helps to guide and control the air flow within the vehicle. The rear air conditioner can further include a side vent 120 formed in the first passage 130 including at least a portion of a heater 220 and configured to fluidly connect the blower 110 with the inner side of the quadrangular panel 400. The rear air conditioner can further include a mix door 190 provided next to the heater 220 and configured to mix air having passed through the heater 220 with air not having passed through the heater 220 by selectively connecting with a portion of the heater 220. In addition, the rear air conditioner can include the mode door 180 provided at the air outlet portion 112 of the air conditioner housing 100 and configured to selectively or simultaneously open the roof duct 160 and the interior duct 170 according to the cooling or heating mode. In addition, the rear air conditioner can include a controller 150 configured to control directions of the mode door 180 and the mix door 190 according to the cooling / heating mode in the cooling mode, to operate the bypass door 300 to open or close the first passage 130 by receiving an external environmental condition, and to operate a local heating heater 230 to heat the air.

[0038] The rear air conditioner can be used for large vehicles such as a van, a recreational vehicle (RV), or a sport utility vehicle (SUV), whose interior space is too large to be sufficiently cooled or heated by only a front air conditioner. In addition, the rear air conditioner can be generally installed in an enclosed space at the rear of the vehicle body, constituting a dual air conditioning system in combination with the front air conditioner.

[0039] The air conditioner housing 100 includes an air intake portion 111 and an air outlet portion 112 to allow outdoor air or indoor circulating air to flow in through the air intake portion 111 and to discharge the cooled or heated air through the air outlet portion 112.

[0040] The blower 110, which is arranged at the air intake portion 111 of the air conditioning housing 100, may include: a motor, which is configured to operate a fan or impeller to circulate air in the air conditioner; and an impeller or wind wheel, which is connected to the shaft of the motor and configured to draw air into the air conditioning system and push the air to the vents within the system through various pipes.

[0041] Air drawn in by the blower 110 is discharged to the roof duct 160 or the interior duct 170 via the second duct 140. In some embodiments, the temperature of the air is increased or decreased by the heat exchanger 200. The heat exchanger 200 includes an evaporator 210 configured to decrease the temperature of the drawn in air, a heater 220 disposed within the second duct 140 and configured to increase the temperature of the drawn in air, and a locally modulated heater 230 disposed within the first duct 130. In some embodiments, to prevent condensation on the outer side of the quadrilateral panel 400 in cooling mode, the temperature of the air drawn in through the first duct 130 may be increased by the locally modulated heater 230.

[0042] The evaporator 210 may be positioned at the front end of the heater 220 to improve system efficiency. In some embodiments, when air is introduced into the vehicle interior, the air introduced into the air conditioning housing 100 is cooled before being heated by the heater 220. The air may be cooled to a desired temperature before being heated to remove moisture from the air.

[0043] In heating mode, the air sucked in by the blower 110 is introduced into the second channel 140, passes through the evaporator 210, and is then heated by the heater 220, thereby increasing the temperature. The heater 220 can be a positive temperature coefficient (PTC) heater. In some embodiments, the PTC heater 220 can be made of a material such as barium titanate, which has a positive temperature coefficient, wherein the resistance value increases as the temperature increases. In addition, the current may be limited by the increase in resistance when the temperature rises. That is, when the temperature of the air flowing into the heater is low, the current will flow, but as the temperature rises, the flow of current will be limited. Therefore, when the temperature is low, the current flows through the PTC heater, and the temperature of the air rises accordingly due to the heat generated when the current flows.

[0044] In some embodiments, in heating mode, the blend door 190 is operated by the controller 150 to rotate and connect to a portion of the heater 220. This allows air that has passed through the evaporator 210 to pass completely through the heater 220. Furthermore, in heating mode, the mode door 180 is operated by the controller 150 to rotate in a direction that closes the roof duct 160 and opens the interior duct 170. As a result, air whose temperature has risen after passing through the heater 220 is introduced into the interior duct 170.

[0045] In the cooling mode, air introduced into the air conditioning housing 100 by the blower 110 is cooled by the evaporator 210. The evaporator 210 is connected to a refrigerant circuit of the vehicle and operates according to the principle of phase change, i.e. the refrigerant circulating through the evaporator 210 absorbs heat from the indoor air and evaporates moisture in the air. The air passing through the evaporator 210 is condensed by heat exchange with the refrigerant circulating through the evaporator 210, loses moisture, and is cooled to reduce the temperature. The air cooled by the above process can be introduced into the heater 220.

[0046] In some embodiments, in the cooling mode, the mixing door 190 is operated by the controller 150 to rotate to selectively connect to a portion of the air conditioning housing 100. The opening and closing amount of the mixing door 190 can be adjusted to mix the air that has passed through the heater 220 with the air that has not passed through the heater 220 among the air cooled by passing through the evaporator 210. The air mixed by adjusting the opening and closing amount of the mixing door 190 can be discharged to the roof duct 160.

[0047] In some embodiments, in the cooling mode, the controller 150 receives the external environmental condition and opens the bypass door 300 to open the first passage 130. In some embodiments, the controller 150 operates the local adjustment heater 230, and the temperature of the air drawn in through the first passage 130 can be increased.

[0048] Figure 2 is a diagram showing the operating state of the bypass door 300 and the local adjustment heater 230 in the cooling mode.

[0049] The bypass door 300 can include a first bypass door 310 configured to open and close the first passage 130 by being disposed next to the local adjustment heater 230, and a second bypass door 320 configured to open and close the side vent 120 by being disposed at the side vent 120.

[0050] When the heating mode or the external environmental condition is not satisfied, the first bypass door 310 moves toward the direction of blocking the first passage 130 formed between the blower 110 and the inside of the quadrilateral panel 400. In some embodiments, the second bypass door 320 moves toward the direction of closing the side vent 120.

[0051] In some embodiments, when the external environmental conditions are satisfied in the cooling mode, the first bypass door 310 moves in a direction to open the first passage 130, and the second bypass door 320 moves in a direction to open the side vent 120. In some embodiments, the air introduced into the air conditioning housing 100 by the blower 110 is partially discharged to the inner surface of the quadrangular panel 400. At this time, the temperature of the inhaled air is increased by the local adjustment heater 230 provided in the first passage 130. In some embodiments, the local adjustment heater 230 can be a PTC heater. As the local adjustment heater 230 is a PTC heater, the resistance value thereof decreases when the temperature of the incoming air decreases, and the current applied to the heater 220 is increased from before, thereby generating high heat. Accordingly, the temperature of the air passing through the local adjustment heater 230 can be increased, and flow into the quadrangular panel 400 through the first passage 130.

[0052] Further, the partial air inhaled by the blower 110 is introduced into the evaporator 210 via the second passage 140. The air introduced into the evaporator 210 loses moisture and decreases in temperature by performing heat exchange in the evaporator 210.

[0053] The air decreased in temperature is discharged to the roof duct 160 through the second passage 140. In some embodiments, in the cooling mode, the mixing door 190 can adjust the opening and closing amount of the mixing door 190 by turning to one side of the air conditioning housing 100 to mix the air having passed through the heater 220 in the partial air having passed through the evaporator 210 with the air not having passed through the heater 220. Further, the mode door 180 moves in a direction to close the inner duct 170, and as the inner duct 170 is closed, the cooled air is discharged to the inside of the vehicle through the roof duct 160.

[0054] Figure 3 is a view illustrating air flow in the heating mode. In the heating mode, the first bypass door 310 moves in a direction to block the first passage 130, and the second bypass door 320 moves in a direction to block the side vent 120. Through this process, the first passage 130 is blocked.

[0055] Further, the air introduced into the air conditioning housing 100 by the blower 110 is introduced into the second passage 140, and then passes through the evaporator 210 and the heater 220 provided in the second passage 140, thereby being discharged to the inner duct 170. In some embodiments, in the heating mode, the mixing door 190 can be turned in a direction connected to a portion of the heater 220. Thereafter, all the air passing through the evaporator 210 passes through the heater 220, thereby increasing the temperature thereof. Further, the mode door 180 moves in a direction to close the roof duct 160 to block the roof duct 160. In some embodiments, the air increased in temperature is discharged to the inside of the vehicle through the inner duct 170.

[0056] Figure 4 is a rear cross-sectional view of the quadrangular panel 400 in which heated air is introduced into the quadrangular panel 400.

[0057] Condensation occurs on the outer surface of the quadrangular panel 400 when the temperature of the air containing moisture is lowered to or below the dew point, and the moisture contained in the air condenses into water droplets on the surface of the object. That is, condensation occurs on the outer surface of the quadrangular panel 400 when water vapor contained in the air condenses by contact with the surface of the object having a relatively low temperature. In addition, condensation is affected by various factors, such as the concentration and temperature of water vapor, atmospheric pressure, the temperature of the surface of the object, and relative humidity.

[0058] To prevent condensation, according to the present disclosure, a portion of the air drawn in by the blower 110 is heated to a predetermined temperature, and the heated air is introduced into the quadrangular panel 400. When the external environmental conditions are satisfied in the cooling mode, the bypass door 300 opens the first passage 130, and the air warmed by the first passage 130 is introduced into the quadrangular panel 400. The air introduced into the quadrangular panel 400 raises the temperature inside it. When the temperature inside the quadrangular panel 400 rises, the temperature on the outside of the quadrangular panel 400 also rises. Accordingly, the difference between the outdoor temperature and the temperature on the outside of the quadrangular panel 400 decreases. In some embodiments, the dew point rises, thereby preventing condensation from occurring on the outer surface of the quadrangular panel 400.

[0059] Figure 5 is a schematic flowchart of the present disclosure preventing condensation.

[0060] A series of processes can be performed to operate the present disclosure. For example, when the rear air conditioner starts operating after step S10, the controller 150 determines whether the rear air conditioner is operating in the cooling mode in step S20. Thereafter, the controller 150 determines whether the rear air conditioner satisfies the external environmental conditions in step S30. When the external environmental conditions are satisfied, the controller 150 operates the local adjustment heater 230 and opens the first bypass door 310 and the second bypass door 320 in step S40. In step S50, the controller 150 also checks the air volume state to prevent the temperature inside the quadrangular panel 400 from decreasing. In addition, the controller 150 can continuously supply air to the quadrangular panel 400 through feedback control.

[0061] Figure 6 is a detailed flowchart of the operation of the condensation prevention system in the cooling mode.

[0062] When the rear air conditioner starts operating after step S10, the controller 150 first checks whether the rear air conditioner is operating in the cooling mode at step S20. When it is determined that the rear air conditioner is operating in the cooling mode at step S30, the controller 150 receives external environmental conditions to determine whether the external environmental conditions are satisfied. When the external environmental conditions are satisfied, the controller 150 can form the first passage 130 and operate the local regulation heater 230 to heat air introduced through the first passage 130. More specifically, in determining whether the external environmental conditions are satisfied at step S31, the controller 150 can determine whether the outdoor temperature is equal to or greater than a predetermined temperature, whether the solar radiation amount is equal to or less than a predetermined amount, whether the discharge temperature is equal to or less than a predetermined temperature, and whether the external relative humidity is equal to or greater than a predetermined humidity. The factors of the information values of the external environmental information can be received through an automatic defogging sensor (ADS), an outdoor temperature sensor, a light sensor, a GPS, weather, a duct sensor, etc.

[0063] In some embodiments, the information value of the outdoor temperature can be calculated by receiving weather information from an outdoor temperature sensor, the information value of the solar radiation amount can be calculated by receiving weather information from a light sensor, and the information values of the solar radiation amount and the external relative humidity can be calculated by receiving weather information of the current location through a GPS from an automatic defogging sensor (ADS) or an information system. The information value of the discharge temperature can be received from a temperature sensor attached to a duct.

[0064] When the external environmental conditions are not satisfied, the controller 150 stops the operation of the local regulation heater 230, moves the first bypass door 310 in a direction to block the first passage 130, and moves the second bypass door 320 in a direction to close the side vent 120 at step S41.

[0065] In some embodiments, when the external environmental conditions are satisfied, the controller 150 opens the first bypass door in a direction to open the first passage 130 and opens the second bypass door in a direction to open the side vent 120. In addition, at step S40, the controller 150 operates the local regulation heater 230 to increase the temperature of air flowing in through the first passage 130. Thereafter, at step S51, the controller 150 determines whether the air volume is equal to or greater than a set value to prevent a decrease in temperature within the quadrangular panel 400.

[0066] When the air volume is less than the set value, the air volume is adjusted to the set value at step S53. When the air volume is equal to or greater than the set value, the air volume is maintained in the current state at step S52. When the air volume is adjusted to the set value or maintained in the current state, the controller 150 can perform feedback control in the cooling mode to repeat the above-described process.

[0067] The present disclosure aims to prevent condensation from occurring on the outside of a quadrilateral panel, and as is apparent from the above description, the following effects can be obtained by the above-described configuration, combination, and use relationship.

[0068] In some embodiments, corrosion caused by external condensation can be prevented.

[0069] In some embodiments, aesthetic damage such as stains or streaks caused by condensation continuously occurring on the exterior panel can be prevented, thereby preventing damage to the exterior of the vehicle.

[0070] In some embodiments, corrosion and aesthetic damage caused by external condensation can be prevented, thereby minimizing maintenance work and related costs.

[0071] The detailed description is merely illustrative of the disclosure. Furthermore, the above-described description illustrates and describes the embodiments of the present disclosure, but the present disclosure can be used in various other combinations, modifications, and environments. That is, changes or modifications can be made within the scope of the inventive concept disclosed herein, the equivalent range of the invention, and / or the scope of the technical or knowledge in the art. The embodiments describe the best state for implementing the technical concept of the present disclosure, and various changes can be made according to the specific application field and use of the present disclosure. Therefore, the detailed description of the present disclosure is not intended to limit the present disclosure to the disclosed embodiments. Furthermore, the appended claims should be interpreted to include other embodiments.

Claims

1. A rear air conditioner for a vehicle, the rear air conditioner comprising: an air conditioner housing including an intake portion and an outlet portion; a blower disposed within the air conditioner housing and connected to the intake portion of the air conditioner housing; a first passageway formed between the blower and an inner side of a quadrilateral panel located in a C-pillar of the vehicle; a side vent formed within the first passageway and facing the quadrilateral panel; at least one bypass door configured to selectively open and close the first passageway; a heat exchanger disposed between the at least one bypass door and the side vent, the heat exchanger disposed within the first passageway; a second passageway formed between the blower and the outlet portion of the air conditioner housing; and a controller configured to, in a cooling mode, based on an external environmental condition: (i) operate the at least one bypass door to open the first passageway, and (ii) operate the heat exchanger. the at least one bypass door includes:

2. The rear air conditioner according to claim 1, wherein a first bypass door configured to open and close the first passageway; and a second bypass door configured to open and close the side vent. the heat exchanger includes:

3. The rear air conditioner according to claim 1, wherein a local conditioning heater disposed within the first passageway; an evaporator disposed within the second passageway; and a heater disposed at a rear end of the evaporator, the heater disposed within at least a portion of the second passageway.

4. The rear air conditioner of claim 3, wherein the controller is configured to operate the local conditioning heater based on the external environmental condition being satisfied. the outlet portion of the air conditioner housing includes:

5. The rear air conditioner according to claim 1, wherein a roof duct disposed within the second passageway; and an inner duct disposed within the second passageway, the inner duct disposed adjacent to the roof duct.

6. The rear air conditioner of claim 5, further comprising: a mode door disposed within the second passageway and configured to vary an opening amount of the inner duct and an opening amount of the roof duct.

7. The rear air conditioner of claim 3, further comprising: a mix door disposed adjacent to the heater and configured to open and close the mix door to selectively bypass the heater for air that has passed through the evaporator. the external environmental condition includes an outdoor temperature of the vehicle, a solar radiation amount, a discharge temperature detected at the outlet portion, and an external relative humidity, and 8. The rear air conditioner according to claim 2, wherein wherein the controller is configured to: determine whether the outdoor temperature is greater than or equal to a predetermined temperature, determine whether the solar radiation amount is less than or equal to a predetermined amount, determine whether the discharge temperature is less than or equal to a predetermined temperature, and determine whether the external relative humidity is greater than or equal to a predetermined humidity. the controller is configured to, 9. The rear air conditioner according to claim 8, wherein based on the external environmental condition being satisfied: (i) operate the first bypass door and the second bypass door to open the first passageway, and (ii) control the heat exchanger to heat air.

10. A quadrilateral panel air supplier comprising: an air conditioner housing including an intake portion and an outlet portion; a blower disposed within the air conditioner housing and connected to the intake portion of the air conditioner housing; ​ a first passageway formed between the blower and an inner side of a quadrilateral panel of the vehicle; a side vent formed within the first passageway, the side vent facing the quadrilateral panel; at least one bypass door configured to selectively open and close the first passageway; a heat exchanger disposed between the bypass door and the side vent, the heat exchanger disposed within the first passageway; and a controller configured to, in a cooling mode, based on external environmental conditions: (i) operate the at least one bypass door to open the first passageway, and (ii) operate the heat exchanger. the at least one bypass door includes:

11. The quadrilateral panel air supplier of claim 10, wherein, a first bypass door configured to open and close the first passageway; and a second bypass door configured to open and close the side vent. the heat exchanger includes a local conditioning heater disposed within the first passageway.

12. The quadrilateral panel air supplier of claim 11, wherein, the external environmental conditions include an outdoor temperature of the vehicle, an amount of solar radiation, an exhaust temperature detected at the outlet, and an external relative humidity, and 13. The quadrilateral panel air supplier of claim 11, wherein, wherein the controller is configured to: determine whether the outdoor temperature is greater than or equal to a predetermined temperature, determine whether the amount of solar radiation is less than or equal to a predetermined amount, determine whether the exhaust temperature is less than or equal to a predetermined temperature, and determine whether the external relative humidity is greater than or equal to a predetermined humidity. the controller is configured to, based on the external environmental conditions being satisfied: (i) operate the first bypass door and the second bypass door to open the first passageway, and (ii) control the heat exchanger to heat air.

14. The quadrilateral panel air supplier of claim 13, wherein, ​

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