FR2849689A1 - Heat exchanger for hybrid vehicle air conditioner, has secondary radiator cooling primary fluid that cools thermal motor, to cool electronic parts, and condenser cooling secondary fluid to temperature less than primary fluid - Google Patents

Abstract

The exchanger (100) has a primary radiator cooling a primary fluid that is applied to a thermal motor to release heat from the motor. A secondary radiator again cools primary fluid to be passed through electronic parts to release the heat from the parts. A condenser (170) at upstream of the primary and secondary radiators cools a secondary fluid to a temperature less than the primary fluid. The primary and secondary radiators cools the primary fluid by transferring heat between the primary fluid and air passing through respective primary and secondary radiator. A part of the secondary radiator is arranged facing opposite to a part of the condenser that receives a circulation of secondary fluid from the down stream.

Description

DOUBLE HEAT EXCHANGER FOR VEHICLE AIR CONDITIONER

  BACKGROUND OF THE INVENTION 1. Field of the Invention: The present invention relates generally to heat exchangers, and in particular to a double heat exchanger comprising several heat exchangers such as a radiator and a condenser, for a vehicle air conditioner. The present invention is suitably applicable to a hybrid vehicle switchably driven by a heat engine and an electric motor, or else driven mainly by the electric motor while using the heat engine for the generation of electricity.

  2. Related technique: Conventionally, a hybrid vehicle comprises an internal combustion engine and an electric motor, and needs to cool the internal combustion engine and the electronic parts of the vehicle such as an inverter which controls the electric motor. In general, a heat engine coolant intended to cool the heat engine is cooled by a radiator to have a temperature of 100 to 110 ° C. and less. When the electronic parts are cooled by a coolant, the coolant (hereinafter called coolant for the electronic parts) needs to be cooled by the radiator to have a temperature lower than that of the coolant of the heat engine such as 60 30 to 70 C and below.

  In a vehicle air conditioner having a refrigeration cycle, a maximum coolant temperature is approximately 80 to 90 ° C, which is lower than that of the engine coolant. Therefore, a condenser of the refrigeration cycle which condenses a high pressure refrigerant in the cycle is disposed at an air side upstream of the radiator. The difference between the temperature of the air passing through the condenser and the temperature of the coolant of the electronic parts circulating in the radiator is smaller than the difference between the temperature of the air having passed through the condenser and the temperature of the coolant. cooling of the engine circulating 5 in the radiator. Therefore, when the coolant of the electronic parts flowing through the radiator performs a heat exchange with the air having passed through the condenser, the coolant of the electronic parts can be insufficiently cooled. As a result, the electronic parts can be insufficiently cooled by the coolant of the electronic parts. The electronic parts can be sufficiently cooled when a radiating surface of the radiator which cools the coolant of the electronic parts is increased. In such a case, however, the size of the radiator is increased.

  SUMMARY OF THE INVENTION In view of the foregoing problems, it is an object of the present invention to provide a heat exchanger which sufficiently cools a heat generating element without increasing the size of the heat exchanger.

  According to the present invention, a heat exchanger has first, second and third heat exchangers and is connected to the first and second heat generating elements. The first heat exchanger performs a heat exchange between a first fluid circulating through the first heat exchanger and the air passing through the first heat exchanger in order to cool the first fluid. The first fluid cooled by the first heat exchanger is introduced into the first heat-generating element. The second heat exchanger performs heat exchange between the first fluid flowing through the second heat exchanger and the air passing through the second heat exchanger in order to cool the first fluid to a temperature lower than that of the first fluid introduced into the first element giving off heat. The second heat exchanger delivers the first fluid cooled by the second heat exchanger to the second heat-generating element. A third heat exchanger is disposed at an air side upstream from the first and second heat exchangers to effect heat exchange between a second fluid flowing through the third heat exchanger and the air passing through it. through the third heat exchanger. The second fluid has a temperature lower than that of the first fluid flowing through the first and second heat exchangers. At least part of the second heat exchanger is arranged opposite a part of the third heat exchanger which receives a downstream circulation of the second fluid, so that the air having passed through the part of the third heat exchanger heat passes through the second heat exchanger.

  When the third heat exchanger is a condenser, the second fluid has a lower temperature at a downstream side than at an upstream side in the third heat exchanger. Therefore, the air having passed through the part of the third heat exchanger which receives the downstream circulation of the second fluid 20 has a temperature lower than that of the air having passed through the other part of the third heat exchanger. As a result, the difference between the temperature of the air passing through the second heat exchanger and the temperature of the first fluid flowing through the second heat exchanger is increased. Therefore, the first fluid flowing through the second heat exchanger is sufficiently cooled, and the second heat-generating element is sufficiently cooled by the first fluid without increasing the size of the second heat exchanger.

  Preferably, the third heat exchanger comprises a central condenser part which condenses a refrigerant from a refrigeration cycle and a cooling device which cools the refrigerant discharged from the central condenser part. At least part of the second heat exchanger is disposed opposite the cooling device so that the air having passed through the cooling device passes through the second heat exchanger. Because a certain amount of heat radiated from the cooling device is smaller than that of the central condenser part, the difference between the temperature of the air passing through the second heat exchanger and the temperature of the first circulating fluid through the second heat exchanger is increased. As a result, the first fluid flowing through the second heat exchanger is sufficiently cooled.

  BRIEF DESCRIPTION OF THE DRAWINGS This and other objects and features of the present invention will become more readily apparent from a better understanding of the preferred embodiments described below with reference to the accompanying drawings, in which: Figure 1 is a simplified perspective view showing a double heat exchanger intended for a vehicle air conditioner according to a first preferred embodiment of the present invention.

  FIG. 2 is a simplified perspective view showing the double heat exchanger according to the first embodiment.

  Figure 3 is a block diagram showing a coolant circuit of the double heat exchanger according to the first embodiment.

  FIG. 4 is a simplified partial perspective view showing the double heat exchanger according to the first embodiment.

  Figure 5 is a simplified perspective view showing a double heat exchanger for a vehicle air conditioner according to a second preferred embodiment of the present invention.

  Figure 6 is a block diagram showing a coolant circuit of the double heat exchanger according to the second embodiment.

  FIG. 7 is a simplified perspective view showing a double heat exchanger for a vehicle air conditioner according to a third preferred embodiment of the present invention.

  Figure 8 is a block diagram showing a coolant circuit of the double heat exchanger according to the third embodiment.

  Figure 9 is a simplified perspective view 5 showing a double heat exchanger for a vehicle air conditioner according to a fourth preferred embodiment of the present invention, and Figure 10 is a block diagram showing a circuit of coolant from a double heat exchanger for a vehicle air conditioner according to. fifth preferred embodiment of the present invention.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

  Preferred embodiments of the present invention are described below with reference to the accompanying drawings.

  (First embodiment) A first preferred embodiment of the present invention will be described with reference to Figures 1 to 4.

  In the first embodiment, the present invention is applied to a double exchanger 100 intended for an air conditioner for a hybrid vehicle. In FIG. 25 1, the heat exchanger 100 is observed from a downstream air side with respect to the air passing through the heat exchanger 100. In FIG. 2, the heat exchanger 100 is observed from a upstream air side.

  As shown in FIG. 1, the heat exchanger 30 100 comprises a first radiator 110 which performs a heat exchange between the coolant of the heat engine circulating in a heat engine 200 (not shown) of the vehicle intended for cooling the engine thermal 200 and the air passing through the first radiator 35 110 so that the coolant of the thermal engine is cooled. The first radiator 110 comprises several tubes of first radiator 111 through which the coolant of the heat engine circulates, several corrugated fins 112 each of which is disposed between adjacent tubes of first radiator 111 in order to facilitate a heat exchange between the fluid for cooling the heat engine and the air, and the inlet and outlet compartments of the first radiator 113, 5 114 respectively disposed at the left and right ends of the circulation path of the first tubes 111 of FIG. 1 in order to '' being in communication with the first tubes 111. The cooling fluid of the combustion engine discharged 10 from the combustion engine 200 flows into the inlet compartment of the first radiator 113 from an inlet orifice 115 of the compartment 113 and is distributed to each of the tubes of the first radiator 111. After having undergone a heat exchange with the air to be cooled, 15 the coolant of the heat engine circulating through the tubes of the first radiator 111 is collected in the outlet compartment of the first radiator 114 and is discharged towards the heat engine 200 via an outlet orifice 116 in the compartment 114.

  The heat exchanger 100 also includes a second radiator 120 which performs a heat exchange between the coolant of the electronic parts, intended to cool the electronic parts 210 of the vehicle and the air passing through the second radiator 120 so that The coolant of the electronic parts is cooled, and discharges the coolant of the cooled electronic parts to the electronic parts 210. The second radiator 120 comprises several second radiator tubes 121 through which the coolant 30 of the electronic parts circulates , several corrugated fins 122 each of which is disposed between adjacent tubes of second radiator 121 in order to facilitate a heat exchange between the coolant of the electronic parts and the air, and of the inlet and outlet compartments of the second radiator 123, 124 disposed respectively at the ends left and right of the path of circulation of the second radiator tubes 121 of FIG. 1 to be in communication with the second radiator tubes 121.

  The coolant of the electronic parts discharged from the electronic parts 210 flows into the second radiator inlet compartment 123 via an inlet orifice 125 of the compartment 123 5 and is distributed to each of the second tubes radiator 121. after having undergone a heat exchange with the air to be cooled, the coolant of the electronic parts circulating through the tubes of second radiator 121 is collected in the outlet compartment of second radiator 124 and is discharged to the electronic parts 210 via an outlet orifice 126 in the compartment 124.

  The first radiator inlet compartment 113, the first radiator outlet compartment 114, the second radiator inlet compartment 123 and the second radiator outlet compartment 124 respectively have compartment bodies 113a, 114a, 123a and 124a each of which is formed along a pipe having a rectangular cross section. The first and second radiators 110, 120 are formed integrally between the compartment bodies 113a, 114a, 123a and 124a. The compartment body 113a is separated from the compartment body 123a by a partition wall 131 disposed between them. The compartment body 114a is separated from the compartment body 124a by a partition wall 132 disposed between them. Therefore, a space between the first and second radiators 110, 120 is separated by the partition walls 131, 132 into a space comprising the inlet and outlet compartments of the first radiator 113, 114 and a space comprising the 30 compartments. inlet and outlet of second radiator 123, 124. As shown in FIG. 3, a first water pump (P / E) 220 is driven by the heat engine 200 so as to bring the coolant from the heat engine 35 to circulate through the heat engine 200 and the first radiator 110. A second water pump (P / E) 230 is electrically driven in order to cause the coolant of the electronic parts to circulate through the electronic parts 210 and the second radiator 120. A modification of the quantity of coolant of the heat engine in the first radiator 110 is absorbed by a first reserve container (R / R) 140. A modification of the qua ntity of coolant of the electronic parts in the second radiator 120 is absorbed by a second reserve container (R / R) 141. The first radiator 110 is filled and supplemented with coolant from the engine of the first reserve container 140 via a first filling hole 142. The second radiator 120 is filled and supplemented with coolant from the electronic parts of the second reserve container 141 via a second filling hole 143. Each first and second filling holes 142, 143 are closed. 15. by a well-known pressurization radiator cap. In the first embodiment, the coolant of the heat engine has the same composition as that of the coolant of the electronic parts, and a solution of water supplemented with ethylene glycol antifreeze agent 20 is used as the coolant. cooling of the internal combustion engine and coolant of electronic parts. As shown in FIG. 2, the heat exchanger comprises a condenser integrated into the cooling device 170 arranged at an air side upstream from the first and second radiators 110, 120. The condenser 170 comprises a central part condenser 150 which condenses by high pressure refrigerant in a refrigeration cycle of the air conditioner, and a device for 30. cooling 160 which cools the refrigerant discharged from the central part of the condenser 150. In the condenser 170, the refrigerant circulates as indicated by arrows in FIG. 2. The temperature of the refrigerant circulating through the condenser 170 is lower than that 35 of the engine coolant and the coolant of the electronic parts circulating through the first and second radiators 110, 120. When the temperature of the air outside the passenger compartment of the vehicle is approximately 300 C , the temperature of the refrigerant at the inlet of the condenser 170 is approximately 80 to 900 C, and the average temperature of the refrigerant in the cooling device 160 is approximately 450 C. The central part of the condenser 150 comprises several condenser tubes 151 through which the refrigerant circulates, several corrugated fins 152 each of which is disposed between adjacent condenser tubes 151 to facilitate heat exchange between the refrigerant and the air passing through the condenser 170 and first and second condenser compartments 153, 154 disposed respectively at the left ends and straight path of circulation of the condenser tubes 151 of FIG. 2 in order to be in communication with the condenser tubes 151. The refrigerant discharged from a compressor (not shown) of the refrigeration cycle circulates into the first condenser compartment 153 and is distributed to each of the condenser tubes 151. After having undergone a heat exchange with the air to be cooled, the refrigerant flowing through the condenser tubes 151 is collected in the second condenser compartment 154 and is discharged to the cooling device 160.

  The cooling device 160 comprises several cooling device tubes 161 through which the refrigerant circulates, several corrugated fins each of which is arranged between adjacent cooling device tubes 161 and first and second cooling device compartments 163, 164 30 disposed respectively at the left and right ends of the circulation path of the cooling device tubes 161 of FIG. 2 so as to be in communication with the cooling device tubes 161. The refrigerant flowing into the first compartment of cooling device 163 is distributed to each of the cooling device tubes 161. After undergoing heat exchange with the air to be cooled, the refrigerant flowing through the cooling device tubes 161 is collected in the second compartment cooling device 164 and is discharged to a decompressor (not shown) of the refrigeration cycle.

  The central condenser portion 150 and the cooler 160 are integrally formed between the first and second condenser compartments 153, 154 and the first and second cooler compartments 163, 164. A space within the central part of condenser 150 and of cooling device 160 is separated into a space comprising the first and second condenser compartments 153, 154 and a space comprising the first and second compartments of cooling device 163, 164 by a partition wall (not shown) disposed between the first condenser compartment 153 and the second cooling device compartment 164 and a partition wall (not shown) disposed between the second condenser compartment 154 and the first cooling device compartment 163. in addition, a separator 171 is brazed integrally on the condenser 170. The separator 171 separates the refrigerant from the second condenser compartment 154 into liquid coolant and gaseous coolant and discharges the liquid coolant into the first compartment 25 of cooler 163. Excess refrigerant from the refrigeration cycle is also stored in the separator 171.

  As shown in Figures 1 and 2, the first and second radiator tubes 111, 121, the condenser tubes 151 and the cooler tubes 161 are arranged to extend parallel to each other in a longitudinal direction thereof and practically perpendicular to the direction of air circulation. In addition, a pair of side plates 180 extending parallel to the tubes 111, 121, 151 and 161 are arranged between the compartments 113, 114, 123, 124, 153, 154, 163 and 164 in order to reinforce the first and second radiators 110, as well as the condenser 170.

  As shown in Figure 4, each of the fins 112 of the first radiator 110 is integrally formed with each of the fins 152 of the central condenser portion 150 through a connection portion 190. Similarly, each fins 122 of the second radiator 120 is formed integrally with each of the fins 162 of the cooling device 160 via the connection portion 190. Thus, the first and second radiators 110, 120 and the condenser 170 are formed integrally with the fins 112, 122, 152 and 162 and the side plates 180. In addition, as shown in Figures 1 and 2, the second radiator 120 is arranged at an immediate upstream side of the device air cooling 160 so that at least part of the second radiator 120 is arranged opposite a part of the condenser 170 which receives a downstream circulation of refrigerant. In general, in a condenser through which a refrigerant flows, the refrigerant is further condensed at a downstream side to have a lower temperature than an upstream side. As a result, the air having passed through a part of the condenser which receives a downstream circulation of refrigerant has a temperature lower than that of the air having passed through the other part of the condenser.

  According to the first embodiment, the second radiator 120 is arranged at an air side downstream of the condenser 170 to be opposite the cooling device 160, that is to say the part of the condenser 170 which receives a downstream refrigerant circulation. Therefore, the difference between the temperature of the coolant of the electronic parts flowing through the second radiator 120 and the temperature of the air passing through the second radiator 120 is increased. As a result, the coolant of the electronic parts 35 is sufficiently cooled by air at a lower temperature, and the electronic parts 210 are sufficiently cooled by the coolant of the electronic parts without increasing the size of the second radiator 120.

  The refrigerant in the central condenser part 150 is condensed and is cooled while radiating condensation heat. The refrigerant in the cooling device 160 is not condensed and is cooled while radiating sensible heat. As a result, the amount of heat radiated from the cooling device 160 is smaller than that of the central condenser part 150. As a result, the temperature of the air having passed through the cooling device 160 is lower than that of the air having passed through the central part of condenser 150. Therefore, the difference between the temperature of the coolant of the electronic parts circulating through the second radiator 120 and the temperature of the air passing through the second radiator 120 is further increased, and the temperature of the coolant of the electronic parts is further decreased. Furthermore, in the first embodiment, the first and second radiators 110, 120 as well as the condenser 20 170 are formed in an integrated manner. Therefore, the first and second radiators 110, 120 and the condenser 170 are mounted on the vehicle during a single mounting process, thereby improving the mounting efficiency thereof on the vehicle. Furthermore, since the second radiator 120 is arranged at an air side downstream from the condenser 170, the cooling performance of the condenser 170 is not affected by the second radiator 120. As a result, the consumption compressor energy is not increased.

  (Second Embodiment) A second preferred embodiment of the present invention will be described with reference to Figures 5 and 6. In this embodiment as well as in the following, the constituents which are practically the same as those of the embodiments previous achievements are assigned the same 35 reference numbers.

  In the first embodiment, as shown in Figure 3, a coolant circuit of the engine and a coolant circuit of the electronic parts are independent of each other.

  In the second embodiment, as shown in FIG. 5, a communications hole 131a is formed in the partition wall 131 arranged between the inlet compartment of the first radiator 113 and the inlet compartment 5 of the second radiator 123 of so that the inlet and outlet compartments of the first radiator 113, 114 communicate with the second inlet and outlet compartments of the second radiator 123, 124. As a result, as shown in FIG. 6, the second hole of filling 143 10 and the second reserve container 141 of the second radiator 120 of the first embodiment are omitted. As a result, the number of parts of the heat exchanger 100 is reduced, and the manufacturing cost of. the heat exchanger 100 is reduced. (Third embodiment) A third preferred embodiment of the present invention will be described with reference to Figures 7 and 8. In the third embodiment, as shown in Figure 7, the partition wall 131 and the orifice Input 20 125 of the second radiator 120 of the first embodiment are omitted. As a result, the coolant introduced from the inlet orifice 115 flows into the inlet compartment of the first radiator 113 and the inlet compartment of the second radiator 123 123. As a result, as shown in the FIG. 8, the second filling hole 143 and the second reserve container 141 of the second radiator 120 of the first embodiment are omitted, thereby reducing the number of parts of the heat exchanger 100 as well as the manufacturing cost of the heat exchanger 100. In addition, the second water pump 230 is also omitted. As a result, the number of parts of the vehicle is reduced and the efficiency of mounting the heat exchanger 100 on the vehicle is improved.

  (Fourth embodiment) A fourth preferred embodiment of the present invention will be described with reference to Figure 9.

  In the fourth embodiment, as shown in FIG. 9, the second radiator outlet compartment 124 is arranged below the first radiator inlet compartment 113, and the second radiator inlet compartment 123 is arranged at the - below the first radiator outlet compartment 114. The first radiator inlet compartment 113 is separated from the second radiator outlet compartment 124 by the partition wall 131. The first radiator outlet compartment 114 communicates with the compartment input of second radiator 123.

  The inlet 125 of the second radiator 120 of the first embodiment is omitted.

  As a result, the coolant of the heat engine introduced into the first radiator 110 from the inlet orifice 115 is cooled in the first radiator 110 and is mainly discharged from the outlet orifice 116 of the first radiator 110. However, part of the coolant of the heat engine circulating through the first radiator 110 flows into the second radiator 120 while making a U-turn between the outlet compartment of the first radiator 114 and the compartment inlet of the second radiator 123, and is discharged from the outlet orifice 126 of the second radiator 120.

  As a result, the coolant of the electronic parts is cooled by both the first and second radiators 110, 120, and the temperature of the coolant of the electronic parts is further decreased. The flow rate of the engine coolant is regulated by adjusting the size and position of the outlet port 116 of the first radiator 110. The temperature of the coolant of electronic components is regulated by adjusting the amount of coolant of the heat engine flowing from the first radiator 110 to the second radiator 120 while making a U-turn between the outlet compartment of the first radiator 114 and the inlet compartment of the second radiator 123.

  (Fifth embodiment) A fifth preferred embodiment of the present invention will be described with reference to Figure 10.

  In the fifth embodiment, as shown in FIG. 10, the second water pump 230 of the first embodiment is omitted, and the cooling fluid discharged from the first water pump 220 is distributed to the first radiator 110 and the second radiator 120. The ratio between the quantity of cooling fluid supplied to the first radiator 110 and the quantity of cooling fluid supplied to the second radiator 120 is adjusted by a valve 231. In the fifth embodiment, the first pump to Water 220 is electrically driven, and the first water pump 220 and the valve 231 are controlled by an electronic control unit (ECU) 232.

  In the above-mentioned embodiments, the condenser 170 can be replaced by a radiator of a supercritical refrigeration cycle in which the high pressure of the refrigerant exceeds the critical pressure of the refrigerant, such as a refrigeration cycle through from which carbon dioxide circulates. In such a case, since the refrigerant is not condensed in the radiator, the second radiator 120 is preferably arranged at a side 20 of air downstream of the radiator to be opposite to a part of the radiator which receives a downstream circulation of refrigerant. In addition, the first and second radiators 110, 120 and the condenser 170 can be formed separately as long as the first and second radiators 110, 120 and the condenser 170 are arranged as mentioned above in the heat exchanger. 100.

  Although the present invention has been fully described in connection with preferred embodiments thereof with reference to the accompanying drawings, it should be appreciated that various changes and modifications will become apparent to those skilled in the art. Such changes and modifications are to be understood to be within the scope of the present invention as defined by the appended claims.

16 2849689

Claims (11)

  1. Heat exchanger (100) connected to first and second heat-generating elements (200, 210), heat exchanger (100) through which air passes, the heat exchanger (100) comprising: a first heat exchanger (110) .. performing a heat exchange between a first fluid circulating through the first heat exchanger (110), and the air 10 passing through the first heat exchanger (110) in order to cool the first fluid, the first fluid cooled by the first heat exchanger (110) being introduced into the first heat-generating element (200), a second heat exchanger (120) performing heat exchange between the first circulating fluid through the second heat exchanger (120) and the air passing through the second heat exchanger (120) in order to cool the first fluid to a temperature lower than that of the first fluid introduced into the first element 20 releasing from heat (200), the second heat exchanger (120) discharging the first fluid cooled by the second heat exchanger (1.20) to the second heat-generating element (210), and a third heat exchanger (170) disposed at an air side upstream of the first and second heat exchangers (110, 120) in order to carry out a heat exchange between a second fluid circulating through the third heat exchanger (170) and the passing air through the third heat exchanger (170), the second fluid 30 having a temperature lower than that of the first fluid flowing through the first and second heat exchangers (110, 120), in which at least part of the second heat exchanger heat (120) is disposed opposite a portion of the third heat exchanger (170) which receives downstream circulation of the second fluid.   2. Heat exchanger (100) according to claim 1, wherein the first heat exchanger (110) comprises a plurality of first tubes (111) through which the first fluid circulates, a first inlet compartment (113 ) arranged at a first end of the circulation path of the first tubes (111) in order to distribute the first fluid to each of the first tubes (111) and a first outlet compartment (114) arranged at a second end of the path of circulation of the first tubes (111) in order to collect the first fluid having undergone a heat exchange with the air in it, the second heat exchanger (120) comprises a plurality of second tubes (121 ) through which the first fluid flows, a second inlet compartment (123) disposed at a first end of the path of circulation of the second tubes (121) for the purpose of distributing the first fluid to each of the second tubes (121) and a second outlet compartment (124) disposed at a second end of the flow path of the second tubes (121) for collecting the first heat exchanged fluid with the air in the latter, and the first and second heat exchangers (110, 120) are formed integrally between at least one of an integration of the first and second inlet compartments (113, 123) and an integration of the first and second 25 outlet compartments (114, 124).   3. Heat exchanger (100) according to claim 2, wherein the first inlet compartment (113) communicates with the second inlet compartment (123). 30 4. Heat exchanger (100) according to claim 3, in which the first inlet compartment (113) has an inlet orifice (115) through which the first fluid is introduced into the first inlet compartment 35 (113) and the second entry compartment (123).   5. Heat exchanger (100) according to claim 3, wherein the second inlet compartment (123) has an inlet orifice (115) through which the first fluid 1 8 is introduced into the first compartment entry (113) and the second entry compartment (123).   6. Heat exchanger (100) according to claim 1, in which the first heat exchanger (110) communicates with the second heat exchanger (120) so that part of the first fluid cooled by the first heat exchanger ( 110) flows into the second heat exchanger (120).   7. The heat exchanger (100) according to claim 2, further comprising: a separating element (131) disposed between the first inlet compartment (113) and the second outlet compartment (124) to separate the first inlet compartment (113) of the second outlet compartment (124), wherein: the first outlet compartment (114) communicates with the second inlet compartment (123), and at least one of the first compartment outlet 20 (114) and the second inlet compartment (123) has an outlet orifice (116) through which the first fluid is discharged.   8. Heat exchanger (100) according to claim 1, wherein the third heat exchanger (170) is a condenser. 9. Heat exchanger (100) connected to an internal combustion engine (200), an electronic part (210) and a vehicle refrigeration cycle, heat exchanger (100) through which air passes , the heat exchanger (100) comprising: a first heat exchanger (110) performing a heat exchange between a cooling fluid * 35 circulating through the first heat exchanger (110) and air passing through the first heat exchanger (110) for cooling the coolant, the coolant cooled by the first heat exchanger (110) being introduced into the engine (200), a second heat exchanger (120) providing heat exchange between the coolant flowing through the second heat exchanger (120) and air passing through the second heat exchanger (120) to cool the coolant, the second heat exchanger ch aleur (120) discharging the coolant cooled by the second heat exchanger (120) to the electronic part (210), and a third heat exchanger (170) disposed at an air side upstream of the first and second heat exchangers (110, 120), the third heat exchanger (170) having a central condenser part (150) which condenses a high pressure refrigerant in the refrigeration cycle and a cooling device (160) which cools the refrigerant discharged from the central condenser part (150), in which at least a part of the second heat exchanger (120) is arranged opposite the cooling device (160).   10. Heat exchanger (100) according to claim 9, wherein the first, second and third heat exchangers (110, 120, 170) are formed integrally.   11. Heat exchanger (100) according to claim 9 or 25, wherein the second heat exchanger (120) cools the coolant to a temperature lower than that of the coolant introduced into the engine (200).