JPH1191343A - Heat exchanger for heating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the distribution of a blowout temperature of a heat exchanger for heating, by utilizing an electric heating element. SOLUTION: This heat exchanger comprises a heat exchanging core part 3 in which a number of tubes 6 for hot water flowing are arranged, and an electric heating element 9 is mounted on a part of the heat exchanging core part 3. The electric heating element 9 is mounted in a direction in parallel, with the tubes 6, the electric heating element 9 comprises a heat generating element 9a divided into plural pieces along a longitudinal direction b of the tubes 6, and these plural heat generating elements 9a are independently energized. Whereby the distribution of the blowout air temperature along the longitudinal direction b of the tubes, can be variously changed by controlling the energization to the plural heat generating elements 9a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating heat exchanger in which an electric heating element is integrated, and heats air using hot water (engine cooling water) heated by a vehicle engine (internal combustion engine) as a heat source. It is suitable for use in a vehicle heat exchanger.

[0002]

2. Description of the Related Art In recent years, as vehicle engines have become more efficient,
Even after the engine is warmed up, the temperature of the hot water (cooling water) of the vehicle engine tends to be lower than before.
For this reason, in a hot water type air conditioner that heats the interior of a vehicle cabin by using waste heat from engine cooling water, insufficient heating capacity has been an issue.

[0003] Therefore, in Japanese Patent Application Laid-Open No. 5-69732, an electric heating element is integrated with a hot water type heat exchanger for heating.
It has been proposed to supply electricity to the electric heating element when the temperature of the hot water is low and to heat the heating air by the heat generated by the electric heating element, thereby solving the shortage of the heating capacity.

[0004]

In the above-mentioned conventional apparatus, the power supply to the electric heating element is simply interrupted according to the temperature of the hot water (engine cooling water). Thus, it is not possible to control the temperature distribution of the air blown out of the heating heat exchanger. The present invention has been made in view of the above points, and an object of the present invention is to provide a heating heat exchanger that can control a blowout temperature distribution by using an electric heating element.

[0005]

To achieve the above object, according to the first aspect of the present invention, a heat exchange core (3) in which a number of tubes (6) through which a heat source fluid flows are arranged in parallel.
In a heating heat exchanger in which an electric heating element (9) is installed at a part of the heat exchange core section (3), the electric heating element (9) is parallel to the tube (6). And a heating element (9a) divided into a plurality of pieces along the longitudinal direction (b) of the tube (6) on the electric heating element (9). 9a) is characterized in that it can be energized independently.

According to this, by independently controlling the energization to the plurality of heating elements (9a) divided in the tube longitudinal direction (b), any one of the plurality of heating elements (9a) is controlled. Only the conduction mode, and the other heating element (9
It is possible to set an energization mode for only a), a simultaneous energization mode for a plurality of heating elements (9a), an energization cutoff mode for a plurality of heating elements (9a), and the like.

As a result, the temperature distribution of the blown air along the longitudinal direction (b) of the tube can be variously changed based on the requirements of the air conditioner as shown in FIG. In the invention according to claim 4, the inlet-side tank (1) for distributing the heat source fluid to the multiple tubes (6) and the outlet-side tank (1) for collecting the heat source fluid passing through the multiple tubes (6). 2), wherein the heat source fluid flows in a number of tubes (6) in one direction from the inlet tank (1) to the outlet tank (2).

According to this, even in the heat exchanger (H) in which the temperature of the heat source fluid decreases from the inlet side tank (1) to the outlet side tank (2), the tube longitudinal direction (H) of the heat exchanger (H) is also used. The distribution of the temperature of the blown air along b) can be varied (see FIG. 5) by controlling the energization of the plurality of heating elements (9a). Further, according to the invention described in claim 5, according to claim 4,
Wherein the inlet-side tank (1) is located on the lower side and the outlet-side tank (2) is located on the upper side of the heating heat exchanger (H). In this manner, a vehicle air conditioner housed in an air conditioning case (24) is characterized.

According to this, in a vehicle air conditioner,
The distribution of air temperature in the vertical direction of the heating heat exchanger (H) can be variously changed by controlling the energization of the plurality of heating elements (9a) (see FIG. 5). In the invention according to claim 6, in the air conditioning case (24), the heating heat exchanger (H) is provided.
A defroster opening (28) for blowing air inside the vehicle window glass and a face opening (29) for blowing air toward the upper body of the occupant are provided in the upper portion on the downstream side of the air.
And a foot opening (30) for blowing air toward the feet of the occupant is arranged in a lower part of the air conditioning case (25) on the downstream side of the air of the heating heat exchanger (H). I have.

According to this, in a vehicle air conditioner,
The defroster opening (28) and the face opening (2
The distribution of the temperature of the air blown out from the foot opening (30) and the temperature of the air blown out from the foot opening (30) is calculated by a plurality of heating elements (9a).
Various changes can be made (see FIG. 5) by controlling the power supply to the motor. In addition, the code | symbol in the parenthesis of each said means shows the correspondence with the concrete means of embodiment mentioned later.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 to 4 show a first embodiment of a vehicle heating heat exchanger H to which the present invention is applied.
In this, the heat exchanger H has a hot water inlet side tank 1 and
The tank includes a hot water outlet side tank 2 and a heat exchange core 3 provided between the tanks 1 and 2.

An inlet pipe 4 into which engine cooling water from a vehicle engine (not shown), that is, hot water (heat source fluid) flows, is provided at one end of the hot water inlet side tank 1 in the longitudinal direction (left-right direction in FIG. 1). . Similarly, an outlet pipe 5 is provided at one end of the hot water outlet side tank 2 in the longitudinal direction, and the hot water flows out of the outlet pipe 5 to the outside and is returned to the engine side.

The bottom portions 1a and 2a of the tanks 1 and 2 (FIG. 2)
2), a number of flat tube insertion holes (not shown) are formed side by side in the vertical direction in FIG. The heat exchange core 3 is in the flow direction of the air for heating (the direction of arrow a in FIG. 2).
A large number of flat tubes 6 formed in a flat shape parallel to are arranged in parallel in the vertical direction in FIG. In addition, the flat tube 6 shown in FIG. 2 has a shape having a joining portion for dividing the passage in the tube into two at the center of the flat cross section. Although arranged, the flat tubes 6 may be arranged in a plurality of rows in the flow direction a of the heating air.

A corrugated fin (fin member) 7 formed in a wave shape is arranged and joined between the plurality of flat tubes 6. This corrugated fin 7
As is well known, a large number of louvers 7a are cut and raised at a predetermined angle with respect to the flow direction a of the heating air, and the louvers 7a are formed to improve the fin heat transfer coefficient.

The openings at both ends of the flat tube 6 are inserted into the tube insertion holes of the bottom surfaces 1a and 2a of the tanks 1 and 2, respectively, and are joined. Further, side plates 8a and 8b are disposed further outside the corrugated fins 7 on the outermost sides (upper and lower ends in FIG. 2) of the core portion 3, and the side plates 8a and 8b are provided with the outermost corrugated fins 7 and the tank. 1 and 2.

As shown in FIG. 3, in the heat exchange core 3 where the electric heating element 9 is installed, the bent portions of the adjacent corrugated fins 7 are placed in the longitudinal direction of the flat tube 6, respectively. Extending flat metal holding plates 10 and 11 are joined together, and a predetermined distance L (L = thickness of the electric heating element 9) is set between the two metal holding plates 10 and 11, and The electric heating element 9 is assembled between the holding plates 10 and 11. The length of the two holding plates 10 and 11 is substantially the same as the width of the heat exchange core portion 3 (dimension in the left-right direction in FIG. 2) in FIG.

In the heat exchanger H of this embodiment, all of the components 1 to 8b and the two holding plates 10 and 11 are formed of aluminum (including an aluminum alloy). Component 1
8b and the holding plates 10, 11 are joined by brazing,
The heat exchanger is assembled. By the way, since the electric heating element 9 is installed in a part of the heat exchange core 3 instead of the flat tube 6, two metal holding plates 10 and 11 are provided.
The thickness of the flat tube 6 (e.g., 1 mm) is set to be the same as the thickness of the flat tube 6 (for example, 1 mm). In the example of FIG. 2, the electric heating elements 9 are installed at equal intervals at three locations (hatched portions) of the heat exchange core 3.

As shown in FIG. 3, the electric heating element 9 has a plate-like heating element 9a, and elongated plate-like electrode plates 9b and 9e arranged on both front and back surfaces of the heating element 9a. 9c is a three-layer sandwich structure. The heating element 9a is set at a predetermined set temperature (for example, 90 °).
A PTC heater element made of a resistor material (for example, barium titanate) having a positive resistance-temperature characteristic whose resistance value rapidly increases at T ₀ .

The electrode plates 9b, 9e and 9c are formed of a conductive metal material such as copper, for example.
e, a plurality of heating elements 9a in the longitudinal direction of 9c,
Are located. The heating element 9a and the electrode plate 9
Electric contact between b, 9e and 9c is obtained by pressing each other. Heating element 9a
The electrode plates 9b and 9e located on one side are, for example, positive electrode plates, and the electrode plate 9c located on the other side is, for example, a negative electrode (installation side) electrode plate.

Each of the three electric heating elements 9 is vertically divided into two parts in the flat tube longitudinal direction (warm water flow direction) b of the heat exchange core part 3 as shown in FIG. The electric heating elements 9 divided into two sections can be energized independently. In order to realize this upper and lower two-part structure, the positive electrode plate is divided into two electrode plates 9b and 9e at an intermediate portion in the vertical direction in FIG. 1, and the heating element 9a is electrically connected to the upper and lower parts. Divided into two groups.

On the other hand, the negative side (ground side) electrode plate 9c
Consists of one flat plate that is continuous over the entire length of the heat exchange core 3 in the tube longitudinal direction b. On the other hand, the electrode plate 9b,
The entire periphery of 9e and 9c is covered with a covering member 9d made of an electrically insulating material. Then, the coating member 9 d is pressed against the holding plates 10 and 11,
The electric heating element 9 is assembled between the two holding plates 10 and 11.

Here, the covering member 9d is attached to the holding plates 10, 11
And the two electrode plates 9b, 9e, and 9c, and at the same time, the heat of the heating element 9a is transferred to the holding plate 10,
In order to perform heat conduction, the thickness of the covering member 9d between the holding plates 10, 11 and the two electrode plates 9b, 9e, 9c is set to, for example, a thin film having a thickness of about 25 μm to 100 μm. Is secured. As a specific material of the covering member 9d, a resin having high heat resistance (for example, a polyimide resin or the like) is preferable.

The heat exchange core 3 is provided with a fastening (band) member (not shown) for applying a fastening force in a direction orthogonal to the group of many flat tubes 6. The electric heating element 9 is moved by the tightening force to the heat exchange core 3.
While holding the heating element 9a and the two electrode plates 9b, 9e, 9c under pressure, to establish electrical continuity between the two 9a, 9b, 9e, 9c. It has gained.

Next, a control system for controlling the energization of the electric heating element 9 will be described with reference to FIG. 1. The air-conditioning electronic control unit 12 is composed of a microcomputer or the like. Based on the above, a predetermined arithmetic processing is performed to control energization to the electric heating element 9 and the like. The output signal of the electronic control unit 12 is applied to relays 13 and 14, and the relays 13 and 14 cause the positive electrode plate 9b,
The power supply to the upper heating element 9a and the lower heating element 9a of the electric heating element 9 is interrupted through 9e. Therefore, in this example, the electronic control unit 12 and the relays 13 and 14 constitute control means for controlling the energization of the upper and lower heating elements 9a.

Power is supplied to the electronic control unit 12 from an on-board battery 16 via an ignition switch 15 for interrupting the operation of a vehicle engine (not shown).
This vehicle-mounted battery 16 includes an alternator (AC generator)
The battery 16 is charged by the output voltage of the alternator 17. On the other hand, the electronic control unit 12
Are supplied with signals from the following various sensors. That is, a water temperature sensor 18 that detects a hot water temperature of a water-cooled vehicle engine, an outside air temperature sensor 19 that detects an outside air temperature, and a battery voltage sensor (battery charge signal generation unit) 20 that generates a signal corresponding to a charging voltage of the on-board battery 16. Signals from a maximum heating switch 21 that generates a signal of a maximum heating state, an air conditioning operation switch (for example, an air conditioning blower switch) 22, and the like are input to the electronic control device 12.

The maximum heating switch 21 is opened and closed according to whether or not the vehicle air conditioner is in the maximum heating state. For example, when the temperature adjustment method of the vehicle air conditioner is a known hot water flow rate adjustment method, as shown in FIG.
When the hot water valve 23 for adjusting the flow rate of the hot water flowing into the heat exchanger H for heating is operated to the fully open position and the maximum flow rate of hot water flows into the heat exchanger H for heating (maximum heating state),
The maximum heating switch 21 is turned on.

In FIG. 4, the inlet heat tank H of the heating heat exchanger H is located on the lower side and the outlet tank 2 is located on the upper side. ). An inside / outside air switching box 25 is provided at the airflow upstream end of the air conditioning case 24, and air (inside air or outside air) sucked through the inside / outside air switching box 25 is blown by a centrifugal blower 26. This blast air is cooled by a cooling heat exchanger (evaporator) 27 and then passes through a heating heat exchanger H to be reheated to a predetermined temperature.

Here, in the upper part of the air conditioning case 24 on the downstream side of the air of the heating heat exchanger H, a defroster opening 28 for blowing air into the inside of the vehicle window glass, and the air is directed toward the upper body of the occupant. Face opening 29 that blows out
Has been arranged. In the air-conditioning case 25, a foot opening 30 for blowing air toward the feet of the occupant is disposed below the heating heat exchanger H on the downstream side of the air. Each of these openings 28 to 30 is a blow mode switching door 31,
It is opened and closed by 32 and 33.

Accordingly, the outlet mode switching doors 31 to 31
By opening and closing 33, air at a predetermined temperature can be blown into the vehicle interior through one or more of the defroster opening 28, the face opening 29, and the foot opening 30. Next, the operation of the above configuration will be described. First, the outline of the operation by each functional component will be described. When heating the passenger compartment, the air conditioner blower 26 is operated, and the hot water valve 23 provided in the hot water circuit to the heating heat exchanger H is opened. Air blower 26
, The heating air passes through the gap between the flat tube 6 and the corrugated fin 7 of the heating heat exchanger H. On the other hand, the warm water from the engine flows into the warm water inlet side tank 1 from the inlet pipe 4 of the heating heat exchanger H via the warm water valve 23 by the operation of the water pump of the vehicle engine.

The hot water is distributed to a number of flat tubes 6 in the inlet side tank 1 and radiates heat to the heating air via the corrugated fins 7 while flowing through the flat tubes 6 in parallel. The hot water that has passed through the many flat tubes 6 flows into the hot water outlet side tank 2 and is collected there, and the hot water flows out of the heat exchanger from the outlet pipe 5 and returns to the engine side.

On the other hand, during heating, when the temperature of the hot water is low and the electric heating element 9 needs to be heated, the relays 13 and 14 are turned on, and the electric heating element 9 is connected to the vehicle-mounted battery 1.
6 is applied. Thereby, each electric heating element 9 is energized and generates heat. The heat generated by each electric heating element 9 is transmitted to the corrugated fins 7 on both sides, and is radiated from the corrugated fins 7 to heating air. Therefore, even when the temperature of the hot water is low, the heating air can be quickly heated to perform the immediate heating.

Here, the heating element 9a of the electric heating element 9 is a PTC element having a positive resistance temperature characteristic in which the resistance value rapidly increases at a predetermined Curie point. It has a self-temperature control function for self-control. Next, the electric heating element 9 which is a feature of the present invention.
The operation of controlling the temperature distribution of the blown air from the heat exchanger H for heating will be described below.
a is divided into two parts in the tube longitudinal direction (warm water flow direction) b of the heat exchange core part 3, so that the heating element 9a is divided into two parts, that is, the upper heating element 9a and the lower heating element 9a. The power supply to the element 9a can be controlled independently.

Accordingly, a first mode in which the upper and lower heating elements 9a are simultaneously energized, a second mode in which only the upper heating element 9a is energized, and a third mode in which only the lower heating element 9a is energized. And a fourth mode in which energization to both the upper and lower heating elements 9a, 9a is simultaneously cut off. Therefore, by controlling the energization of the upper and lower heating elements 9a, 9a, it is possible to set the temperature distribution of the blown air of the heating heat exchanger H to a form corresponding to various requirements as shown in FIG.

In the case of the maximum heating shown in FIG. 5, the hot water valve 23 is operated to the fully open position, and the hot water flows into the heating heat exchanger H at the maximum flow rate. This is the time when the valve 23 is operated to the intermediate opening position and the hot water is reduced to a predetermined flow rate and flows into the heating heat exchanger H. If the maximum capacity is required during the maximum heating, the first mode in which the upper and lower heating elements 9a, 9a are energized simultaneously is set. Thereby, the heating heat exchanger H
The air temperature distribution of the upper and lower heating elements 9a, 9a
Can be increased from the temperature distribution indicated by the broken line when the power is not supplied to the level indicated by the solid line, and the maximum heating capacity can be exhibited.

Further, at the time of maximum heating, the temperature of the air blown out from the defroster opening 28 and the side face opening 29 (located at the left and right ends of the vehicle instrument panel of the face opening 29, When it is desired to preferentially increase the temperature of the air blown out from the blow-off opening used to prevent fogging of the window, a second mode in which only the upper heating element 9a is energized is set. As a result, the temperature distribution of the blown air from the heating heat exchanger H is changed from the temperature distribution indicated by the broken line when the heating element is not energized to the solid line as shown by the solid line due to the heat generated by the upper heating element 9a. The outlet air temperature above H can be preferentially increased.

As a result, the temperature of the air blown out from the defroster opening 28 and the side face opening 29 arranged above the air conditioning case 24 can be preferentially increased as compared with the temperature of the air blown out from the foot opening 30. As a result, the anti-fog ability of the vehicle window glass can be increased. In addition, if it is desired to prevent the occupant's face from being hot during the maximum heating, a third mode in which only the lower heating element 9a is energized is set. As a result, the temperature distribution of the blown air from the heating heat exchanger H is changed by the heat generated by the lower heating element 9a, as shown by the solid line from the temperature distribution shown by the broken line when the heating element is not energized. The temperature of the blown air at the lower side of the vessel H can be preferentially increased.

As a result, the temperature of the air blown out from the foot opening 30 can be preferentially increased as compared with the temperature of the air blown out from the defroster opening 28 and the temperature of the air blown out from the side face opening 29. The distribution of the temperature of the air blown into the vehicle interior can be of a cold-head type, and the occupant's face can be prevented from burning. On the other hand, at the time of temperature control, when the temperature of air blown out from the face opening 29 and the foot opening 30 is set to the same temperature, and the same temperature bi-level mode in which air is blown out from both the openings 29 and 30 is set, The second mode in which only the heating element 9a is energized is set.

Here, in the heating heat exchanger H, the hot water flows in one direction from all the flat tubes 6 from the lower inlet tank 1 to the upper outlet tank 2, so that the temperature of the hot water is lower. From the top to the bottom. Particularly, at the time of temperature control, the flow rate of the hot water is reduced to a small flow rate by the hot water valve 23, so that the lowering rate of the hot water temperature on the upper side is increased.
For this reason, as shown by the broken line when the heating element is not energized, the temperature distribution of the blown air of the heating heat exchanger H is high on the lower side and low on the upper side.

However, the upper and lower outlet temperature distributions can be made substantially the same as indicated by the solid line due to the heat generated by the upper heating element 9a, so that the face opening 29 and the foot opening 3 are formed.
The same-temperature bi-level mode can be set to make the temperature of the blown air from 0 the same. In the temperature control, when the normal bi-level mode in which the temperature of the air blown out from the foot opening 30 is set higher than the temperature of the air blown out from the face opening 29 is set, the upper and lower heating elements 9a are used. , 9a
A fourth mode is set in which power supply to the power supply is simultaneously cut off. Thereby, utilizing the fact that the temperature of the hot water decreases as going from the lower side of the heat exchanger to the upper side, it is possible to obtain an outlet air temperature distribution in which the temperature is high on the lower side of the heat exchanger and lower on the upper side, Normal bi-level mode can be set.

As described above, various demands for the temperature distribution of the blown air of the heat exchanger H for heating can be satisfactorily handled by controlling the power supply to the electric heating element 9. (Second Embodiment) FIG. 6 shows a second embodiment. In the first embodiment, the heating element 9a of the electric heating element 9 is divided into two upper and lower groups. Heating element 9
Are divided into three groups: upper, middle, and lower.
To this end, the positive electrode plate of the electric heating element 9 is divided into three upper, middle, and lower electrode plates 9b, 9e, and 9f, and a voltage is applied to the three electrode plates 9b, 9e, and 9f by three. It is controlled by relays 13, 14, and 34.

According to the second embodiment, the three relays 13, 14, and 34 energize the upper, middle, and lower three heating elements 9a.
, The temperature distribution of the blown air from the heating heat exchanger H can be controlled more finely in the vertical direction. (Other Embodiments) In the first and second embodiments, the positive electrode plate 9b of the electric heating element 9 is divided into a plurality of pieces. However, the negative electrode plate 9c is divided into a plurality of pieces. Also, the power supply to the plurality of heating elements 9a can be controlled independently.

In the first and second embodiments, the case where the heating heat exchanger H is arranged vertically is described. However, the present invention is also applicable to the case where the heating heat exchanger H is arranged horizontally. Is applicable. Further, in the first embodiment, the case where the present invention is applied to the vehicle air conditioner (FIG. 4) of the type that adjusts the temperature of the air blown into the vehicle compartment by the flow rate of hot water has been described. The present invention is similarly applied to an air-mixing type air conditioner for a vehicle that adjusts the ratio of the amount of hot air passing therethrough and the amount of cool air that bypasses the heating heat exchanger H to adjust the temperature of air blown into the vehicle interior. Of course you can.

In the first and second embodiments, the present invention has been described with reference to a vehicle heat exchanger. However, the present invention is not limited to a vehicle heat exchanger, but may be applied to various other applications. Widely applicable. In addition, it is needless to say that the installation form (installation place, number of installations, etc.) of the electric heating element 9 is not limited to the form shown in FIG. 2 and can be variously changed according to a change in the specification of the heating heat exchanger.

The heat source fluid flowing into the tube 6 of the heat exchanger H for heating may be oil or the like in addition to hot water.

[Brief description of the drawings]

FIG. 1 is a front view showing an outline of a heating heat exchanger according to a first embodiment of the present invention.

FIG. 2 is a partially broken perspective view showing a specific configuration of the heating heat exchanger according to the first embodiment of the present invention.

FIG. 3 is an enlarged perspective view of an electric heating element installation section according to the first embodiment.

FIG. 4 is a schematic sectional view of a vehicle air conditioner to which the heating heat exchanger of the first embodiment is applied.

FIG. 5 is a table for explaining the operation of the first embodiment.

FIG. 6 is a front view showing an outline of a heating heat exchanger according to a second embodiment of the present invention.

[Explanation of symbols]

1, 2, tank, 3 heat exchange core, 6 flat tube, 7 corrugated fin, 9 electric heating element, 9a heating element, 9b, 9c, 9e, 9f electrode plate, 12 control Device, 13, 14, 34 ... relay.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hajime Ito 1-1-1, Showa-cho, Kariya-shi, Aichi, Japan

Claims (6)

[Claims] 1. A heat exchange core part (3) in which a number of tubes (6) through which a heat source fluid flows are arranged in parallel, and a part of the heat exchange core part (3) is electrically heated. In the heating heat exchanger for installing the body (9), the electric heating element (9) is installed in a direction parallel to the tube (6), and the tube (6) is attached to the electric heating element (9). Heating element (9a) divided into a plurality along the longitudinal direction (b) of the above, wherein the plurality of heating elements (9a) can be independently energized. vessel. 2. The electric heating element (9) includes a positive electrode plate (9b, 9e, 9f) and a negative electrode plate (9c), and the two electrode plates (9b, 9e, 9f) (9c). The plurality of heating elements (9a) are disposed between the tubes, and at least one of the positive electrode plate (9b, 9e, 9f) and the negative electrode plate (9c) is disposed in the longitudinal direction of the tube (6). 2. A plurality of heating elements (9a) are independently controlled through a plurality of divided electrode plates in a direction (b) through the plurality of divided electrode plates. A heat exchanger for heating according to item 1. 3. The heating system according to claim 1, further comprising control means (12, 13, 14, 34) for controlling energization of the plurality of heating elements (9a). For heat exchanger. 4. An inlet tank (1) for distributing the heat source fluid to the multiple tubes (6), and an outlet tank (2) for collecting the heat source fluid passing through the multiple tubes (6). ), Wherein the heat source fluid flows from the plurality of tubes (6) toward the outlet tank (2) from the inlet tank (1).
Characterized in that it is distributed in one direction.
The heat exchanger for heating according to any one of the above. 5. The heat exchanger (H) for heating according to claim 4,
The heating heat exchanger (H) is arranged such that the inlet side tank (1) is located on the lower side and the outlet side tank (2) is located on the upper side, and the air conditioning case (24) An air conditioner for a vehicle, wherein the air conditioner is housed in a vehicle. 6. A defroster opening (28) for blowing air inside a vehicle window glass, in an upper portion of the air conditioning case (24) on the downstream side of the air of the heating heat exchanger (H). A face opening (29) for blowing air toward the upper body of the occupant is disposed, and a lower portion of the air conditioning case (25) on the downstream side of the air of the heating heat exchanger (H) is directed toward the occupant's feet. The air conditioner for a vehicle according to claim 4, wherein a foot opening (30) for blowing air is disposed.