Patent Publication Number: US-2021178856-A1

Title: Air conditioner for vehicles

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 15/946,259 filed Apr. 5, 2018, pending, and claims priority from Korean Patent Application No. 10-2017-0045134 filed Apr. 7, 2017, each of which is hereby incorporated by reference in its entirety. 
    
    
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to an air conditioner for a vehicle, and more particularly, to an air conditioner for a vehicle, which includes a heat pump system for providing integrated heating and cooling because an evaporator and a condenser are respectively mounted on a first air passageway and a second air passageway inside an air-conditioning case. 
     Background Art 
     In general, an air conditioner for a vehicle is an apparatus for cooling or heating the interior of the vehicle by cooling or heating through the process of introducing outdoor air into the interior of the vehicle or circulating indoor air of the vehicle. Such an air conditioner for a vehicle includes an evaporator for cooling the inside of an air-conditioning case; a heater core for heating the inside of the air-conditioning case; and a mode converting door for selectively blowing the air cooled by the evaporator or heated by the heater core toward parts of the interior of the vehicle. 
     Such an air conditioner includes: a compressor for compressing and discharging refrigerant; a condenser for condensing the refrigerant of high pressure discharged from the compressor; an expansion valve for throttling the refrigerant condensed and liquefied in the condenser; and an evaporator for exchanging heat between the liquefied refrigerant of low pressure throttled by the expansion valve and air blown to the interior of the vehicle and evaporating the refrigerant to cool the air discharged to the interior of the vehicle due to heat absorption by evaporative latent heat, and a cooling cycle of the air conditioner is configured such that the compressor, the condenser, the expansion valve and the evaporator are connected with each other via refrigeration pipes. 
     Recently, heat pump systems which perform heating and cooling only using the cooling cycle have been developed.  FIG. 1  is a view showing a conventional heat pump system for a vehicle. As shown in  FIG. 1 , the heat pump system for the vehicle includes an air-conditioning case  10  in which a cold air passageway  11  and a warm air passageway are partitioned from each other, an evaporator  4  disposed on the cold air passageway for cooling, and a condenser  2  disposed on the warm air passageway  12  for heating. 
     An air outflow port  15  for supplying air to the interior of the vehicle, and an air discharge port  16  for discharging air to the outside are formed at an outlet of the air-conditioning case  10 . Blowers  20  are respectively disposed at inlets of the cold air passageway  11  and the warm air passageway  12  to be actuated individually. 
     In a cooling mode, the cold air cooled while passing the evaporator  4  of the cold air passageway  11  is discharged to the interior of the vehicle through the air outflow port  15  to cool the interior of the vehicle, and the warm air heated while passing the condenser  2  of the warm air passageway  12  is discharged to the outside of the vehicle through the air discharge port  16 . 
     In a heating mode, the warm air heated while passing the condenser  2  of the warm air passageway  12  is discharged to the interior of the vehicle through the air outflow port  15  to heat the interior of the vehicle, and the cold air cooled while passing the evaporator  4  of the cold air passageway  11  is discharged to the outside of the vehicle through the air discharge port  16 . 
     To sum up, the conventional heat pump system for a vehicle has blowers located in front of and/or behind a heat exchanger including the evaporator and the condenser. In the cooling mode, the indoor air exchanged heat with the evaporator  4  is re-circulated to the interior, and the outdoor air exchanged heat with the condenser  2  is discharged to the outside. In the heating mode, the indoor air exchanged heat with the condenser  2  is re-circulated to the interior, and the outdoor air exchanged heat with the evaporator  4  is discharged to the outside. 
     The conventional heat pump system for a vehicle has a disadvantage in that it requires a high specification because specification of the blowers must be set on the basis of the outside discharge air volume requiring a relatively high air volume. Moreover, the conventional heat pump system for a vehicle has another disadvantage in that the blowers are actuated in a low efficiency area when it is used for indoor circulation according to modes. That is, the heat pump system shows higher air-conditioning performance when the outside discharge air volume is large, but the heat pump system is not cost-effective because it must have a high-performance blower for the evaporator and a high-performance blower for the condenser in order to enhance air-conditioning performance. 
     Moreover, the conventional heat pump system for a vehicle uses an electric heater, such as a PTC heater, as an auxiliary heating means for satisfy a target indoor temperature, but it reduces the mileage of eco-friendly vehicles because of excessive power consumption. 
     Furthermore, the conventional heat pump system for a vehicle increases air flow resistance because the air passing through the condenser passes the PTC heater even in the cooling mode in which the PTC heater is not used. 
     SUMMARY OF THE INVENTION 
     Accordingly, the present invention has been made in view of the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide an air conditioner for a vehicle, which can select a blower with the maximum efficiency within a range of a targeted air discharge volume for indoor circulation and select a blower with the maximum efficiency within a range of a targeted air discharge volume for outdoor discharge. 
     It is another object of the present invention to provide an air conditioner for a vehicle, which can enhance heating performance utilizing waste heat of a compressor and prevent addition of unnecessary ventilating resistance in a cooling mode. 
     To accomplish the above object, according to the present invention, there is provided an air conditioner for a vehicle including: an air-conditioning case having a first air passageway and a second air passageway; an evaporator disposed on the first air passageway or the second air passageway; a condenser disposed on the first air passageway or the second air passageway; a first blower arranged on an indoor circulation passage; and a second blower arranged on an outdoor discharge passage. 
     As described above, the air conditioner for the vehicle according to an embodiment of the present invention can select a blower for a vent with low specification, which has a relatively low targeted air volume so as to obtain an effect of reducing manufacturing costs, and can enhance heating performance utilizing waste heat of a compressor and prevent addition of unnecessary ventilating resistance in a cooling mode. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other objects, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a view showing a conventional heat pump system for a vehicle; 
         FIG. 2  is a view showing an air conditioner for a vehicle according to a first preferred embodiment of the present invention; 
         FIG. 3  is a view showing a cooling mode of the air conditioner for a vehicle according to the first preferred embodiment of the present invention; 
         FIG. 4  is a view showing a heating mode of the air conditioner for a vehicle according to the first preferred embodiment of the present invention; 
         FIG. 5  is a view showing a heating mode of the air conditioner for a vehicle according to a second preferred embodiment of the present invention; 
         FIG. 6  is a view showing an air conditioner for a vehicle according to a third preferred embodiment of the present invention; 
         FIG. 7  is a view showing a heating mode of the air conditioner for a vehicle according to the third preferred embodiment of the present invention; 
         FIG. 8  is a view showing a cooling mode of the air conditioner for a vehicle according to the third preferred embodiment of the present invention; 
         FIG. 9  is a view showing an air conditioner for a vehicle according to a modification of  FIG. 6 ; 
         FIG. 10  is a sectional view showing an air conditioner for a vehicle according to a fourth preferred embodiment of the present invention; 
         FIG. 11  is a view showing various arrangement states of a first blower and a second blower of the air conditioner for a vehicle according to the fourth preferred embodiment of the present invention; 
         FIG. 12  is a view showing a cooling mode of the air conditioner for a vehicle according to the fourth preferred embodiment of the present invention; 
         FIG. 13  is a side sectional view of a door of  FIG. 12 ; 
         FIG. 14  is a view showing a heating mode of the air conditioner for a vehicle according to the fourth preferred embodiment of the present invention; and 
         FIG. 15  is a side sectional view of a door of  FIG. 14 . 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Hereinafter, technical structure of an air conditioner for a vehicle according to exemplary embodiments of the present invention will be described with reference to the accompanying drawings. 
       FIG. 2  is a view showing an air conditioner for a vehicle according to a first preferred embodiment of the present invention,  FIG. 3  is a view showing a cooling mode of the air conditioner for a vehicle according to the first preferred embodiment of the present invention, and  FIG. 4  is a view showing a heating mode of the air conditioner for a vehicle according to the first preferred embodiment of the present invention. 
     As shown in  FIGS. 2 to 4 , the air conditioner for the vehicle according to the first preferred embodiment of the present invention is configured by an integrated heat pump system, and includes an air-conditioning case  110 , an evaporator  150 , a condenser  130 , a compressor  120 , an expansion valve  140 , a first blower  170 , a second blower  180 , and a door  190 . 
     In the air-conditioning case  110 , a first air passageway  101  and a second air passageway  102  are partitioned from each other. Through the first air passageway  101 , indoor air and outdoor air are selectively introduced, and also through the second air passageway  102 , indoor air and outdoor air are selective introduced. Moreover, the air-conditioning case  110  has an indoor circulation passage  104  and an outdoor discharge passage  103 . The indoor circulation passage  104  is to supply inside air of the air-conditioning case  110  to the interior of the vehicle, and the outdoor discharge passage  103  is to discharge the inside air of the air-conditioning case  110  to the exterior of the vehicle. 
     The evaporator  150  is disposed on the second air passageway  102 . The evaporator  150  exchanges heat between liquid-phase refrigerant of low pressure discharged from the expansion valve  140 , which will be described later, and the inside air of the air-conditioning case  110  so as to cool air due to heat absorption by evaporative latent heat of refrigerant. 
     The condenser  130  is disposed on the first air passageway  101 . The condenser  130  exchanges heat between gas-phase refrigerant of high-temperature and high-pressure discharged from the compressor  120 , which will be described later. In this process, the refrigerant is condensed and air is heated. 
     The compressor  120  is an electro-compressor actuated by electric energy. The compressor  120  inhales and compresses gas-phase refrigerant of low-temperature and low-pressure passing through the evaporator  150 , and then, discharges the refrigerant in a gas phase of high-temperature and high-pressure to the condenser  130 . 
     The expansion valve  140  rapidly expands the liquid-phase refrigerant discharged from the condenser  130  by a throttling action, and sends the refrigerant in a wet-saturated state of low-temperature and low-pressure to the evaporator  150 . The expansion valve  140  may adopt one of an EXV, a TXV, and an orifice structure. 
     The compressor  120 , the condenser  130 , the expansion valve  140  and the evaporator  150  are disposed on a refrigerant line  150  in order. 
     The first blower  170  is arranged on the indoor circulation passage  104 . Furthermore, the second blower  180  is arranged on the outdoor discharge passage  103 . The first blower  170  and the second blower  180  include fans and motors for operating the fans. 
     That is, the first blower is a blower for vents, which is mounted on an air passageway for indoor circulation, and the second blower is a blower for extractors, which is mounted on an air passageway for indoor and outdoor discharge. The second blower  180  may be a high performance blower which is more in air volume than the first blower  170 . 
     The air conditioner for the vehicle according to the first preferred embodiment can select a blower with the maximum efficiency within a range of a targeted air discharge volume for indoor circulation and select a blower with the maximum efficiency within a range of a targeted air discharge volume for outdoor discharge. Finally, the blower, namely, the first blower, for vents with a relatively low target air volume can be selected at low specification (low cost) so as to obtain cost reduction effect. 
     The door  190  is disposed to be rotatable on a rotary shaft  191  inside the air-conditioning case  110 . The door  190  is disposed at a portion where the first air passageway  101  and the second air passageway  102  meet together. Moreover, at the portion where the first air passageway  101  and the second air passageway  102  meet together, the indoor circulation passage  104  and the outdoor discharge passage  103  selectively communicate with the first air passageway  101  and the second air passageway  102 . 
     In other words, the door  190  allows the first air passageway  101  and the indoor circulation passage  104  to communicate with each other and the second air passageway  102  and the outdoor discharge passage  103  to communicate with each other in the heating mode as shown in  FIG. 4 , or allows the first air passageway  101  and the outdoor discharge passage  103  to communicate with each other and the second air passageway  102  and the indoor circulation passage  104  to communicate with each other in the cooling mode as shown in  FIG. 3 . 
     The air conditioner for the vehicle is configured to selectively supply indoor air and outdoor air to the evaporator  150  and the condenser  130 . As shown in  FIG. 3 , in the cooling mode, the indoor air exchanges heat with the evaporator  150  and is supplied to the interior of the vehicle, and the outdoor air exchanges heat with the condenser  130  and is discharged to the outside of the vehicle. As shown in  FIG. 4 , in the heating mode, the indoor air exchanges heat with the condenser  130  and is supplied to the interior of the vehicle, and the outdoor air exchanges heat with the evaporator  150  and is discharged to the outside of the vehicle. 
     The first blower  170  and the second blower  180  are disposed at the downstream side of the door  190  in an air flow direction. Through the above structure, the air conditioner for the vehicle can embody the cooling mode and the heating mode through the indoor circulation passage by one blower, namely, the first blower, and discharge non-available air through the outdoor discharge passage by the other blower, namely, the second blower. 
     Alternatively, the air conditioner for the vehicle may have a heat pump system configured to perform cooling and heating by one door and two outlets (the indoor circulation passage and the outdoor discharge passage), and includes the blower for indoor circulation and the blower for outdoor discharge, thereby preventing heat loss of the interior of the vehicle and carrying out effective air-conditioning through a simple structure. 
     In the meantime,  FIG. 5  is a view showing a heating mode of the air conditioner for a vehicle according to a second preferred embodiment of the present invention. 
     Referring to  FIG. 5 , the air conditioner for the vehicle according to the second preferred embodiment of the present invention is different from the first preferred embodiment in that arrangement of the compressor is optimized, and repeated description of the air conditioner will be omitted. 
     The compressor  120  compresses refrigerant passing through the evaporator  150  and discharges the compressed air toward the condenser  130 . The compressor  120  is an electro compressor actuated by electric energy. The compressor  120  inhales and compresses gas-phase refrigerant of low-temperature and low-pressure passing through the evaporator  150 , and discharges the refrigerant in a gas phase of high-temperature and high-pressure toward the condenser  130 . 
     The compressor  120  is arranged on the first air passageway  101  in which the condenser  130  is arranged. The compressor  120  is a part including a motor for converting electric energy into rotational energy, and generates heat itself. Because the heat generated from the compressor  120  is waste heat, when the compressor  120  is arranged on the first air passageway  101 , the waste heat may be used as a heating source for heating the interior of the vehicle. 
     It is preferable that the compressor  120  be disposed at the downstream side of the condenser  130  in the air flow direction. That is, the compressor  120  is disposed between the door  190  and the condenser  130 . As shown in  FIG. 5 , in the heating mode, the indoor air exchanged heat with the condenser  130  is first heated, and then, is second heated by exchanging heat with a compressor body while passing through the compressor  120  arranged at the rear end of the condenser  130  so as to raise temperature of the air discharged to the interior of the vehicle. 
     In the meantime,  FIG. 6  is a view showing an air conditioner for a vehicle according to a third preferred embodiment of the present invention,  FIG. 7  is a view showing a heating mode of the air conditioner for a vehicle according to the third preferred embodiment of the present invention, and  FIG. 8  is a view showing a cooling mode of the air conditioner for a vehicle according to the third preferred embodiment of the present invention. 
     Referring to  FIGS. 6 to 8 , the air conditioner for the vehicle according to the third preferred embodiment of the present invention is an integrated heat pump system, and includes an air-conditioning case  110 , an evaporator  150 , a condenser  130 , a compressor  120 , an expansion valve  140 , a first blower  170 , a second blower  180 , a door  190 , an electric heater  135 , and a bypass door  200 . 
     In the air-conditioning case  110 , a first air passageway  101  and a second air passageway  102  are partitioned from each other. Through the first air passageway  101 , indoor air and outdoor air are selectively introduced, and also through the second air passageway  102 , indoor air and outdoor air are selective introduced. Moreover, the air-conditioning case  110  has an indoor circulation passage  104  and an outdoor discharge passage  103 . The indoor circulation passage  104  is to supply inside air of the air-conditioning case  110  to the interior of the vehicle, and the outdoor discharge passage  103  is to discharge the inside air of the air-conditioning case  110  to the exterior of the vehicle. 
     The evaporator  150  is disposed on the second air passageway  102 . The evaporator  150  exchanges heat between liquid-phase refrigerant of low pressure discharged from the expansion valve  140 , which will be described later, and the inside air of the air-conditioning case  110  so as to cool air due to heat absorption by evaporative latent heat of refrigerant. 
     The condenser  130  is disposed on the first air passageway  101 . The condenser  130  exchanges heat between gas-phase refrigerant of high-temperature and high-pressure discharged from the compressor  120 , which will be described later. In this process, the refrigerant is condensed and air is heated. 
     The compressor  120  is an electro-compressor actuated by electric energy. The compressor  120  inhales and compresses gas-phase refrigerant of low-temperature and low-pressure passing through the evaporator  150 , and then, discharges the refrigerant in a gas phase of high-temperature and high-pressure to the condenser  130 . 
     The expansion valve  140  rapidly expands the liquid-phase refrigerant discharged from the condenser  130  by a throttling action, and sends the refrigerant in a wet-saturated state of low-temperature and low-pressure to the evaporator  150 . The expansion valve  140  may adopt one of an EXV, a TXV, and an orifice structure. 
     The compressor  120 , the condenser  130 , the expansion valve  140  and the evaporator  150  are disposed on a refrigerant line  150  in order. 
     The first blower  170  is arranged on the indoor circulation passage  104 . Furthermore, the second blower  180  is arranged on the outdoor discharge passage  103 . The first blower  170  and the second blower  180  include fans and motors for operating the fans. 
     The door  190  is disposed to be able to rotate on a rotary shaft  191  inside the air-conditioning case  110 . The door  190  is disposed at a portion where the first air passageway  101  and the second air passageway  102  meet together. Moreover, at the portion where the first air passageway  101  and the second air passageway  102  meet together, the indoor circulation passage  104  and the outdoor discharge passage  103  selectively communicate with the first air passageway  101  and the second air passageway  102 . 
     The first blower  170  and the second blower  180  are disposed at the downstream side of the door  190  in an air flow direction. However, the first blower  170  and the second blower  180  may be disposed at an air inlet side of the air-conditioning case  110 , which corresponds to the upstream side of the door  190 . 
     Moreover, the air-conditioning case  110  further includes an auxiliary outdoor discharge passage  105  for bypassing the air passing through the condenser  130  toward the outdoor discharge passage  103  and discharging the air to the outside. 
     The electric heater  135  is a PTC heater which generates heat using electric energy, and is disposed on the first air passageway  101  in which the condenser  130  is arranged. The electric heater  135  is arranged at the downstream side of the condenser  130  in the air flow direction. The electric heater  135  is an auxiliary heating source, and heats air by exchanging heat with the air passing the electric heater  135 . The indoor air exchanged heat with the condenser  130  is first heated, and then, is second heated by exchanging heat with a compressor body while passing through the electric heater  135  arranged at the rear end of the condenser  130  so as to raise temperature of the air discharged to the interior of the vehicle. 
     The bypass door  200  controls the air passing through the condenser  130  to selectively pass the auxiliary outdoor discharge passage  105  or bypass the auxiliary outdoor discharge passage  105 . The bypass door  200  is rotatably disposed inside the air-conditioning case  110 . The bypass door  200  opens the first air passageway  101  and closes the auxiliary outdoor discharge passage  105  so that the air passing through the condenser  130  flows toward the door  190  as shown in  FIG. 7 , or opens the auxiliary outdoor discharge passage  105  so that the air passing through the condenser  130  is discharged out, and closes the air passageway directing the door  190  as shown in  FIG. 8 . 
     The air conditioner for the vehicle according to the third preferred embodiment is configured such that the air passing through the condenser  130  flows toward the outdoor discharge passage  103  only in the first air-conditioning mode and is discharged out through the auxiliary outdoor discharge passage  105  in the second air-conditioning mode. In this case, the first air-conditioning mode is the heating mode, and the second air-conditioning mode is the cooling mode. 
     The electric heater  135  is arranged at the downstream side of the bypass door  200  in the air flow direction. In more detail, the electric heater  135  is arranged between the door  190  and the bypass door  200 . Through the above structure, as shown in  FIG. 7 , in the heating mode, the electric heater  135  serves as a heating source by exchanging heat with the air blown to the interior of the vehicle, and as shown in  FIG. 8 , in the cooling mode, the air passing through the condenser  130  does not pass the electric heater  135  but is directly discharged out through the auxiliary outdoor discharge passage  105  so as to reduce unnecessary ventilating resistance to prevent lowering of air volume. 
     In the meantime,  FIG. 9  is a view showing an air conditioner for a vehicle according to a modification of  FIG. 6 . Referring to  FIG. 9 , when the compressor  120  is arranged on the first air passageway  101 , the waste heat generated from the compressor  120  may be utilized as a heating source. That is, the indoor air exchanged heat with the condenser  130  is first heated, is second heated while passing through the compressor  120  arranged at the rear end of the condenser  130 , and then, is third heated while passing the electric heater  135  so as to raise temperature of the air discharged to the interior of the vehicle. 
     Moreover, it is also possible to arrange the compressor  120  at the downstream side of the electric heater  135  in the air flow direction. 
     Meanwhile,  FIG. 10  is a sectional view showing an air conditioner for a vehicle according to a fourth preferred embodiment of the present invention. 
     Referring to  FIG. 10 , the air conditioner for the vehicle according to the fourth preferred embodiment includes an air-conditioning case, an evaporator  150 , a condenser  130 , a first blower  170 , a second blower  180 , and a door  190 . 
     In the air-conditioning case  110 , a first air passageway  101  and a second air passageway  102  are partitioned from each other. Through the first air passageway  101 , indoor air and outdoor air are selectively introduced, and also through the second air passageway  102 , indoor air and outdoor air are selective introduced. Moreover, the air-conditioning case  110  has an indoor circulation passage  104  and an outdoor discharge passage  103 . The indoor circulation passage  104  is to supply inside air of the air-conditioning case  110  to the interior of the vehicle, and the outdoor discharge passage  103  is to discharge the inside air of the air-conditioning case  110  to the exterior of the vehicle. The evaporator  150  is disposed on the second air passageway  102 . The condenser  130  is disposed on the first air passageway  101 . 
     The air-conditioning case includes a first indoor and outdoor air converting door  197  and a second indoor and outdoor air converting door  196  disposed at an air inlet side thereof. The first indoor and outdoor air converting door  197  is disposed on the first air passageway  101  to selectively introduce indoor air and outdoor air to the first air passageway  101 , and the second indoor and outdoor air converting door  196  is disposed on the second air passageway  102  to selectively introduce indoor air and outdoor air to the second air passageway  102 . 
     The first blower  170  is arranged on the indoor circulation passage  104 . Furthermore, the second blower  180  is arranged on the outdoor discharge passage  103 . The first blower  170  and the second blower  180  include fans and motors for actuating the fans. The first blower  170  and the second blower  180  are arranged at the downstream side of the evaporator  150  and the condenser  130  in the air flow direction. The first blower  170  and the second blower  180  are formed in a suction type to inhale air. 
     The first blower  170  and the second blower  180  are arranged at right angles to each other. That is, a rotary shaft of the first blower fan and a rotary shaft of the second blower fan are arranged at right angles to each other.  FIG. 11  is a view showing various arrangement states of the first blower and the second blower of the air conditioner for a vehicle according to the fourth preferred embodiment of the present invention. Referring to  FIG. 11 , because two suction type blowers are arranged at right angles to each other, when the blowers are rotated, as shown in  FIGS. 11A, 11B and 11C , the discharge direction for indoor circulation (vent) and outdoor discharge (extractor) can be freely changed. Therefore, the air conditioner for the vehicle using the two suction type blowers can improve adaptability to vehicles. 
     The door  190  is disposed at a portion where the first air passageway  101  and the second air passageway  102  meet together. Moreover, at the portion where the first air passageway  101  and the second air passageway  102  meet together, the indoor circulation passage  104  and the outdoor discharge passage  103  selectively communicate with the first air passageway  101  and the second air passageway  102 . 
       FIG. 12  is a view showing a cooling mode of the air conditioner for a vehicle according to the fourth preferred embodiment of the present invention, and  FIG. 13  is a side sectional view of a door of  FIG. 12 . 
     Referring to  FIGS. 12 and 13 , in the cooling mode, the door  190  allows the first air passageway  101  and the outdoor discharge passage  103  to communicate with each other, and the second air passageway  102  and the indoor circulation passage  104  to communicate with each other. The indoor air introduced by manipulation of the second indoor and outdoor air converting door  196  is cooled while passing the evaporator  150  along the second air passageway  102 , and then, circulates the interior of the vehicle through the indoor circulation passage  104  by manipulation of the door  190 . The outdoor air introduced by manipulation of the first indoor and outdoor air converting door  197  is heated while passing the condenser  130  along the first air passageway  101 , and then, is discharged to the outside of the vehicle through the outdoor discharge passage  103  by manipulation of the door  190 . 
       FIG. 14  is a view showing a heating mode of the air conditioner for a vehicle according to the fourth preferred embodiment of the present invention, and  FIG. 15  is a side sectional view of a door of  FIG. 14 . Referring to  FIGS. 14 and 15 , in the heating mode, the door  190  allows the first air passageway  101  and the indoor circulation passage  104  to communicate with each other, and the second air passageway  102  and the outdoor discharge passage  103  to communicate with each other. The outdoor air introduced by manipulation of the second indoor and outdoor air converting door  196  is cooled while passing the evaporator  150  along the second air passageway  102 , and then, is discharged to the outside of the vehicle through the outdoor discharge passage  103  by manipulation of the door  190 . The outdoor air introduced by manipulation of the first indoor and outdoor air converting door  197  is heated while passing the condenser  130  along the first air passageway  101 , and then, circulates the interior of the vehicle through the indoor circulation passage  104  by manipulation of the door  190 . 
     While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various modifications and equivalents may be made without deviating from the spirit or scope of the invention. Therefore, it would be understood that the technical and protective scope of the present invention shall be defined by the technical idea as defined by the following claims and the equivalences.