JP2005247114A - Vehicular air-conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular air-conditioner capable of enhancing the quick-starting air-conditioning performance by eliminating heat exchange losses with fan ducts 3-6, and performing cooling and heating even in the fan ducts 3-6. <P>SOLUTION: The vehicular air-conditioner has a flow passage t in which heat exchange medium flows at least through a part of fan ducts 3-6, and air flowing through the fan ducts 3-6 is cooled or heated by heat exchange medium flowing through the flow passage t. Since the fan ducts 3-6 themselves are cooled or heated by the heat exchange medium flowing through the flow passage t, heat exchange loss with the fan ducts in a conventional system can be eliminated. In addition, the quick-start air-conditioning performance is enhanced because conditioned air is further cooled or heated in the fan ducts 3-6. Still further, by cooling or heating conditioned air even in the fan ducts 3-6, heat exchangers 10 and 25 for cooling/heating in an in-cabin air-conditioning unit 1 can be miniaturized, and the entire in-cabin air-conditioning unit 1 can be miniaturized. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vehicle air-conditioning apparatus, and more particularly to an improvement in immediate effect air-conditioning performance.

  In the summer, etc., the temperature in the passenger compartment rapidly rises during parking due to solar radiation. Under such circumstances, there is a great need for immediate cooling in the passenger compartment. Currently, air conditioners such as automobiles are equipped with air ducts that distribute conditioned air to vehicle interior air conditioning units, and send cool and warm air to each outlet in the vehicle interior such as defroster, face and foot. Therefore, the temperature of the air duct rises greatly during parking in summer and the like. For this reason, even if it is desired to perform immediate cooling, there is a problem that the cooling effect is deteriorated because heat is exchanged with the blower duct in which the cold air is heated.

On the other hand, in winter, the opposite is true, and the temperature of the air duct is greatly reduced during parking. There is a problem of getting worse. As prior art relating to immediate heating, there are those shown in Patent Documents 1 and 2 below. In either case, an electric heater serving as an auxiliary heater is installed in the air duct.
JP 60-8110 A Japanese Patent Laid-Open No. 6-8015

  However, in the above-described prior art, since it is necessary to install an electric heater, there are problems of securing space, increasing costs, and increasing weight. Further, for immediate cooling, the ventilation resistance in the air duct is only increased without operating the electric heater. The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to eliminate heat exchange loss with the air duct, and further, to cool and heat the air duct, thereby effecting immediate air-conditioning and heating performance. An object of the present invention is to provide a vehicle air-conditioning apparatus with improved performance.

In order to achieve the above object, the present invention employs technical means described in claims 1 to 10. That is, in the first aspect of the present invention, a vehicle interior air conditioning unit (1) that forms an air flow path, and a blower (2) that introduces air outside the vehicle interior and blows air into the vehicle interior air conditioning unit (1). The heat exchangers (10, 25) that are arranged in the vehicle interior air conditioning unit (1) and exchange heat with air, and the openings (28-30) of the vehicle interior air conditioning unit (1) that blow out the heat-exchanged air And a blower duct (3a-6a) that blows out heat-exchanged air provided in the passenger compartment, and connects and communicates the openings (28-30) and the blowout openings (3a-6a) (3 To 6), a vehicle air conditioner comprising:
At least a part of the air duct (3-6) is provided with a flow path (t) through which the heat exchange medium flows, and the heat exchange medium flowing through the flow path (t) is circulated in the air duct (3-6). It is characterized by cooling or heating the air.

  According to the first aspect of the present invention, since the air ducts (3 to 6) themselves are first cooled or heated by the heat exchange medium flowing in the flow path (t), the conventional air duct and The heat exchange loss can be eliminated. Furthermore, since the conditioned air is cooled or heated in the air ducts (3 to 6), the immediate effect air conditioning performance is improved. Moreover, the cooling / heating heat exchanger (10, 25) in the vehicle interior air conditioning unit (1) can be reduced in size by cooling or heating the conditioned air in the air ducts (3-6). Thus, the entire vehicle interior air conditioning unit (1) can be downsized.

  Further, the invention according to claim 2 is characterized in that the flow path (t) is provided in the air passage of the blower duct (3-6) or in the wall portion forming the air passage. According to the second aspect of the present invention, the air flowing through the air ducts (3 to 6) can be cooled or heated.

  Further, the invention according to claim 3 is characterized in that the flow path (t) is provided in a portion near the center or inner air passage in the thickness direction of the wall portion. According to the invention described in claim 3, this suppresses unnecessary cooling or heating of the air outside the air duct (3 to 6), and air that circulates in the air duct (3 to 6). Can be cooled or heated effectively.

  Further, the invention according to claim 4 is characterized in that the flow path (t) is formed integrally with the wall portion. According to the fourth aspect of the present invention, the air duct with heat exchange function (3 to 6) can be made compact and the cost can be reduced.

  The invention according to claim 5 is characterized in that a convex portion for increasing the heat exchange area is provided in the air passage. Further, the invention according to claim 6 is characterized in that a partition portion for increasing the heat exchange area is provided in the air passage. According to the fifth and sixth aspects of the present invention, the heat exchange efficiency can be improved.

  Further, the invention described in claim 7 is characterized in that the flow path (t) is also provided in the convex part or the partition part. According to the seventh aspect of the present invention, the heat exchange efficiency can be further improved.

  The invention according to claim 8 is characterized in that the heat exchange medium is cooled by the refrigerant evaporator (10) of the refrigeration cycle (R). The invention according to claim 9 is characterized in that the cooling water of the engine (11) is used as the heat exchange medium. According to the inventions of the eighth and ninth aspects, the air duct having the heat exchange function can be provided with the same configuration as the conventional vehicle air conditioner without providing any special cooling / heating means for the heat exchange medium. Cooling and heating can be performed in (3-6).

  In the invention described in claim 10, the heat exchange medium flowing through the flow path (t) circulates between the refrigerant evaporator (10) and the vehicle travel engine (11). ) Is switched by the flow path switching means (15, 16) controlled by the air conditioning control means (17). According to the invention described in claim 10, in conjunction with mode switching in the vehicle interior air conditioning unit (1), the air duct with heat exchange function (3- The cooling and heating in 6) can be activated. Incidentally, the reference numerals in parentheses of the above means are examples showing the correspondence with the specific means described in the embodiments described later.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic diagram showing an overall configuration of a vehicle air conditioner according to an embodiment of the present invention, and shows a state during cooling.

  The refrigeration cycle R of the vehicle air conditioner includes a compressor (refrigerant compressor) 7 that sucks, compresses, and discharges refrigerant, and the compressor 7 is provided with an electromagnetic clutch 7a for intermittent power. The compressor 7 is driven by the power of a vehicle travel engine (engine) 11 being transmitted through an electromagnetic clutch 7a and a belt (not shown), and the air-conditioning controller 17 serves as air-conditioning control means for energizing the electromagnetic clutch 7a. The operation of the compressor 7 is interrupted by interrupting at.

  The high-temperature and high-pressure superheated gas-phase refrigerant discharged from the compressor 7 flows into the condenser 8 forming a refrigerant condenser, and is cooled and condensed by exchanging heat with outside air blown from a cooling fan (not shown). The condensed refrigerant from the condenser 8 is depressurized to a low pressure by an expansion valve 9 that constitutes a decompression means via a receiver (not shown) that constitutes a liquid receiver that separates gas and liquid and accumulates the liquid refrigerant and leads out the liquid refrigerant. It becomes a gas-liquid two-phase state. The expansion valve 9 is a temperature type expansion valve that adjusts the opening degree (refrigerant flow rate) of the valve so as to adjust the degree of refrigerant superheat at the outlet of the evaporator 10 that forms the refrigerant evaporator.

  The evaporator 10 of the heat exchanger for cooling evaporates the low-pressure refrigerant decompressed by the expansion valve 9 and cools the air blown into the vehicle interior. FIG. 2 is a schematic diagram illustrating a schematic structure of the vehicle interior air conditioning unit 1 in FIG. The vehicle interior air conditioning unit 1 is usually mounted inside the instrument panel at the front of the vehicle interior.

  The air conditioning case 21 of the vehicle interior air conditioning unit 1 constitutes a passage for air blown toward the vehicle interior, and the evaporator 10 is installed in the air conditioning case 21. In the evaporator 10 according to the present invention, a brine cooling portion 10b for cooling engine cooling water constituting a heat exchange medium, which will be described later, is adjacent to and integrated with the downstream side of the air cooling portion 10a for evaporating the low-pressure refrigerant. ing.

  In the air conditioning case 21, the blower 2 is disposed on the upstream side of the evaporator 10, and the blower 2 is provided with a centrifugal blower fan 22a and a driving motor 22b. An inside / outside air switching box 23 is disposed on the suction side of the blower fan 22a, and outside air (inside the vehicle interior air) or inside air (inside the vehicle interior) is switched and introduced by an inside / outside air switching door 23a in the inside / outside air switching box 23. In the air conditioning case 21, an air mix door 24 is disposed on the downstream side of the evaporator 10, and a heater core that heats air using cooling water (hot water) of the vehicle travel engine 11 as a heat source on the downstream side of the air mix door 24. 25 is installed as a heat exchanger for heating.

  A bypass passage 26 that bypasses the heater core 25 and flows air (cold air) is formed on the side (upper portion) of the heater core 25. The air mix door 24 is a rotatable plate-like door that adjusts the air volume ratio between the hot air passing through the heater core 25 and the cool air passing through the bypass passage 26, and adjusting the air volume ratio of the cold air. To adjust the temperature of the air blown into the passenger compartment. Accordingly, the air mix door 24 constitutes temperature adjusting means for the air blown into the vehicle interior. Therefore, the air of the desired temperature can be created by mixing the warm air from the heater core 25 and the cool air from the bypass passage 26 in the air mixing unit 27.

  Further, an air outlet mode switching unit is configured on the downstream side of the air mixing unit 27 in the air conditioning case 21. That is, a defroster opening 28 that blows air toward the inner surface of the vehicle front window glass, a face opening 29 that blows air toward the upper body side of the passenger in the vehicle interior, and a foot opening 30 that blows air toward the feet of the passenger in the vehicle interior Etc. are opened and closed by the blowing mode doors 31-33.

  FIG. 3 is a perspective view showing a state in which the air ducts 3 to 6 according to the embodiment of the present invention are attached to the vehicle interior air conditioning unit 1 of FIG. The openings 28 to 30 of the vehicle interior air conditioning unit 1 and the air outlets 3a to 6a provided in the vehicle interior are connected and communicated with each other through the air ducts 3 to 6 which are the main parts of the present invention. More specifically, the defroster opening 28 is connected to the defroster air outlet 3a via the defroster air duct 3, and blows wind toward the inner surface of the vehicle front window glass from the defroster air outlet 3a.

  The face opening 29 is further divided into a center face opening and a side face opening, each of which is divided into a right side (R, for the driver's side) and a left side (L, for the front passenger's side). It has been. The center face opening is connected to the center face air outlet 4a disposed on the upper side of the central part in the left-right direction of the instrument panel via the center face air duct 4, from the air outlet toward the passenger's head in the center of the passenger compartment. And blow out the wind.

  Further, the side face opening is connected to the side face outlet 5 a disposed above the left and right ends of the instrument panel via the side face air duct 5. The side face outlet 5a is provided with a wind direction changing device that is manually operated as is well known. By adjusting the direction of the wind direction plate of the wind direction changing device, It is possible to blow wind toward the vehicle side window glass. The foot opening 30 is also divided into a right side (R, for the driver's seat side) and a left side (L, for the passenger's side), each connected to the foot outlet 6a via the foot air duct 6. The hot air is blown out from the foot outlet to the left and right occupant feet.

  Next, a brine (heat exchange medium) circuit for supplying cold water and hot water to the air ducts 3 to 6 with a heat exchange function of the present invention to be described later will be described. In the present embodiment, since the heater core 25 and the heat source are shared, the cooling water of the vehicle travel engine 11 is used as the brine.

  First, at the time of cooling shown in FIG. 1, the cooling water cooled in the brine cooling portion 10b of the evaporator 10 is pumped by the brine pump 14, and the heat exchange of the present invention is performed from the three-way valve 15 constituting the flow path switching means. It is sent to a blower duct 5 with a function (represented by the side face blower duct 5 in FIG. 1 and FIG. 6 described later). And after cooling the air-conditioning air which flows through the flow path which the ventilation duct 5 with a heat exchange function mentions later, it returns to the brine cooling part 10b of the evaporator 10 from the three-way valve 16 which comprises another flow-path switching means. Repeat the cycle.

  On the other hand, the coolant of the vehicle travel engine 11 is circulated between the radiator 13 disposed on the downstream side of the condenser 8 and the vehicle travel engine 11 by a coolant pump 12 integrated with the engine 11. It has become. The radiator 13 is cooled by exchanging heat with outside air blown from a cooling fan (not shown) together with the condenser 8. Actually, in order to bypass the radiator 13 when the cooling water temperature is equal to or lower than the predetermined temperature, a thermostat and a bypass path are also provided, but they are omitted here.

  FIG. 6 shows a state during heating in the same schematic diagram as FIG. By switching the three-way valves 15 and 16 to the heating side, the cooling water pumped by the cooling water pump 12 also flows from the branch point a to the heater core 25 side, and further from the three-way valve 15 to the air duct 5 with a heat exchange function of the present invention. Sent to. And after heating the air-conditioning air which flows through the flow path mentioned later of the ventilation duct 5 with a heat exchange function, it returns to the engine 11 via the branch point b from the three-way valve 16 which comprises another flow-path switching means. Repeat the cycle.

  In the vehicle air conditioner having such a configuration, signals are input from the various sensors (not shown) to the previous air conditioning control device 17, and the vehicle interior air conditioning unit 1, the blower 2, and the electromagnetic clutch are transmitted from the air conditioning control device 17. Control signals are output to 7a, brine pump 14, three-way valves 15 and 16 and the like to control operation.

  Next, the structure of the air duct with a heat exchange function, which is a main part of the present invention, will be described. FIG. 4 is an example in which the present invention is applied to the defroster air duct 3, (a) is an external perspective view of the defroster air duct 3, and (b) to (f) are flow paths t configured in the air duct 3. It is a perspective view which shows the example of a structure. The blowout duct of the present invention is formed of a synthetic resin material, and a flow path t through which brine flows is integrally formed in at least a part of the inside. The channel t may be integrally formed by resin molding, or may be integrally formed by insert molding using a metal flat tube or the like.

  FIG. 4 is an example of a wide and short duct such as the defroster blower duct 3, and (b) shows that the header tank part T is formed in both wide wall parts forming the air passage of the blower duct 3, and the header tank part T A large number of tubes t communicating with each other are arranged in the air passage to exchange heat with the circulating air. Incidentally, P in the figure is a header pipe for supplying brine to the header tank section T and collecting the brine after heat exchange from the header tank section T.

  The tube t in (b) is a round tube, but it may be a flat tube as shown in (c), or irregularities are provided on both flat surfaces of the flat tube as shown in (d), and air is interposed between them. You may form a flow path so that it may meander and distribute | circulate. Moreover, a flat tube may be arrange | positioned in the longitudinal direction in an air path like (e), and the serpentine type etc. which bent the flat tube like (f) may be sufficient.

  FIG. 5 is an example in which the present invention is applied to the side face blower duct 5, (a) is an external perspective view of the side face blowout duct 5 (L), and (b) to (g) are configured in the blower duct 5. It is a cross-sectional perspective view which shows the structural example of the flow path t which is AA cross section. In an elongated duct such as the side face blower duct 5, (b) forms a header tank part T in the opposing wall part that forms the air passage of the blower duct 5, and communicates between the header tank parts T. The tube t is arranged in the air passage to exchange heat with the circulating air.

  The tube t in (b) is in the direction crossing the air passage, but the tube may be arranged in the direction of the air passage as in (c), or flat instead of a round tube as in (d). The tube may be arranged in the direction of the air passage. The brine distribution direction in the flat tube may be a direction crossing the air passage or a direction facing the circulating air.

  Further, the heat medium flow hole (flow channel) t may be integrally formed in the wall portion forming the air passage as in (e) to (g), and further in the air passage as in (e). Protrusions for increasing the heat exchange area may be provided, partition parts may be provided as in (f) and (g), and heat medium flow holes t may be provided in the protrusions and partition parts. good. The partition shape of the air passage may be a lattice shape as shown in (f) or a honeycomb shape as shown in (g), and is not limited to these examples. Further, the center face blower duct 4 and the foot blower duct 6 which are not described also have the same structure as necessary.

  Next, the outline | summary of the action | operation in the vehicle air conditioner of the said structure is demonstrated using FIG. 1 and FIG.

During cooling (see Fig. 1):
The compressor 7 is driven by connecting the electromagnetic clutch 7a, and the refrigeration cycle R is circulated. In the evaporator 10, the blown air is cooled by the air cooling portion 10a, and the brine (engine cooling water) is cooled by the brine cooling portion 10b. Then, the brine pump 14 is operated by switching the three-way valves 15 and 16 to the cooling circuit side shown in FIG.

  Thereby, the cooling water cooled in the brine cooling portion 10b of the evaporator 10 is pumped by the brine pump 14 and is sent from the three-way valve 15 constituting the flow path switching means to the air ducts with heat exchange functions of the present invention (in FIG. 1). 5). And after cooling the air-conditioning air which flows through the flow path t in each ventilation duct with a heat exchange function, it returns to the brine cooling part 10b of the evaporator 10 from the three-way valve 16 which comprises another flow-path switching means. Repeat the cycle.

During heating (see Figure 6):
The electromagnetic clutch 7a is turned off to stop the compressor 7, and the refrigeration cycle R is not used. The three-way valves 15 and 16 are switched to the heating circuit side shown in FIG. Then, the hot water heated by the engine 11 is pumped by the cooling water pump 12 and flows also from the branch point a toward the heater core 25 to cool the blown air. Further, the air is sent from the three-way valve 15 to each air duct (5 in FIG. 6) with a heat exchange function of the present invention. And after heating the air-conditioning air which flows through the flow path t of each ventilation duct with a heat exchange function, it returns to the engine 11 via the branch point b from the three-way valve 16 which constitutes another flow path switching means, and circulates. repeat.

  Next, features and effects of this embodiment will be described. First, at least a part of the air ducts 3 to 6 is provided with a flow path t through which the heat exchange medium flows, and the air flowing through the air ducts 3 to 6 is cooled or heated by the brine flowing through the flow path t. I have to. According to this, since the air ducts 3 to 6 themselves are first cooled or heated by the brine flowing through the flow path t, it is possible to eliminate the heat exchange loss with the conventional air duct.

  Furthermore, since the conditioned air is cooled or heated also in the air ducts 3 to 6, the immediate effect air conditioning performance is improved. Further, by cooling or heating the conditioned air also in the air ducts 3 to 6, the heat exchangers 10 and 25 for cooling and heating in the vehicle interior air conditioning unit 1 can be reduced in size, whereby the vehicle interior air conditioning unit 1 The whole can be reduced in size.

  Moreover, the flow path t is provided in the wall part which forms the air path thru | or the air path of the ventilation ducts 3-6. Thereby, the air which distribute | circulates the inside of the ventilation ducts 3-6 can be cooled or heated. Moreover, the flow path t is provided in the site | part close | similar to the center thru | or an inner air passage in the plate | board thickness direction of a wall part. Thereby, it is possible to effectively cool or heat the air flowing through the air ducts 3 to 6 while suppressing unnecessary cooling or heating of the air outside the air ducts 3 to 6.

  Moreover, the flow path t is formed integrally with the wall portion. According to this, the air ducts 3 to 6 with the heat exchange function can be configured in a compact manner, and the cost can be suppressed. Moreover, the convex part for increasing a heat exchange area is provided in the air path. Moreover, the partition part for increasing a heat exchange area is provided in the air passage. According to these, all can improve the heat exchange efficiency. Further, the flow path t is also provided in the convex part or the partition part. According to this, the heat exchange efficiency can be further improved.

  The brine is cooled by the evaporator 10 of the refrigeration cycle R. Moreover, the cooling water of the engine 11 is used for the brine. According to these, cooling and heating can be performed by the air ducts 3 to 6 with a heat exchange function in the same configuration as the conventional vehicle air conditioner without providing any special heat exchange medium cooling / heating means. it can.

  In addition, the cooling path in which the brine flowing through the flow path t circulates between the evaporator 10 and the heating path in which the brine circulates between the vehicle travel engine 11 is controlled for air conditioning. The three-way valves 15 and 16 controlled by the device 17 can be switched. According to this, in conjunction with the mode switching in the vehicle interior air conditioning unit 1, the cooling and heating in the air ducts 3 to 6 with the heat exchanging function are effectively operated at the time of cool-down in summer or warm-up in winter. be able to.

It is a mimetic diagram showing the whole composition of the air-conditioner for vehicles in one embodiment of the present invention, and represents the state at the time of cooling. It is a schematic diagram explaining the schematic structure of the vehicle interior air-conditioning unit 1 in FIG. It is a perspective view which shows the state which attached each ventilation duct 3-6 in one Embodiment of this invention to the vehicle interior air-conditioning unit 1 of FIG. It is the example which applied this invention to the defroster ventilation duct 3, (a) is an external appearance perspective view of the defroster ventilation duct 3, (b)-(f) is the structural example of the flow path t comprised in the ventilation duct 3. FIG. FIG. It is the example which applied this invention to the side face ventilation duct 5, (a) is the external appearance perspective view of the side face blowing duct 5 (L), (b)-(g) is the flow comprised in the ventilation duct 5. It is a cross-sectional perspective view which shows the structural example of the path t in AA cross section. In the same schematic diagram as FIG. 1, the state at the time of heating is represented.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Car interior air-conditioning unit 2 ... Blower 3 ... Defroster ventilation duct 3a ... Defroster outlet (air outlet)
4 ... Center face air duct 4a ... Center face air outlet (air outlet)
5. Side face air duct 5a: Side face air outlet (air outlet)
6 ... Foot ventilation duct 6a ... Foot outlet (air outlet)
10. Evaporator (refrigerant evaporator, cooling heat exchanger)
11 ... Engine for vehicle travel (engine)
15, 16 ... Three-way valve (flow path switching means)
17 ... Air-conditioning control device (air-conditioning control means)
25 ... Heater core (heat exchanger for heating)
28: Defroster opening (opening)
29 ... Face opening (opening)
30 ... Foot opening (opening)
R: Refrigeration cycle t: Tube, flat tube, heat medium flow hole (flow path)

Claims (10)

A vehicle interior air conditioning unit (1) forming an air flow path;
A blower (2) that introduces air outside the vehicle interior and blows air into the vehicle interior air conditioning unit (1);
A heat exchanger (10, 25) disposed in the vehicle interior air conditioning unit (1) to exchange heat with the air;
Openings (28-30) of the vehicle interior air conditioning unit (1) for blowing out heat-exchanged air;
An air outlet (3a to 6a) for blowing out air that is provided in the passenger compartment and heat-exchanged;
In the vehicle air conditioner provided with the air duct (3-6) for connecting and communicating the opening (28-30) and the air outlet (3a-6a),
At least a part of the air duct (3-6) is provided with a flow path (t) through which a heat exchange medium flows, and the air duct (3-6) is provided by the heat exchange medium flowing through the flow path (t). ) Cooling or heating the air circulating in the vehicle.   The vehicle air conditioner according to claim 1, wherein the flow path (t) is provided in an air passage of the blower duct (3-6) or in a wall portion forming the air passage.   The vehicle air conditioner according to claim 2, wherein the flow path (t) is provided in a portion near the air passage in the center or inside in the thickness direction of the wall portion.   The vehicle air conditioner according to claim 2, wherein the flow path (t) is formed integrally with the wall portion.   The vehicle air conditioner according to claim 2, wherein a convex portion for increasing a heat exchange area is provided in the air passage.   The vehicle air conditioner according to claim 2, wherein a partition portion for increasing a heat exchange area is provided in the air passage.   The vehicle air conditioner according to claim 5 or 6, wherein the flow path (t) is also provided in the convex part or the partition part.   The vehicle air conditioner according to claim 1, wherein the heat exchange medium is cooled by a refrigerant evaporator (10) of a refrigeration cycle (R).   The vehicle air conditioner according to claim 1, wherein cooling water of the engine (11) is used as the heat exchange medium.   The heat exchange medium flowing through the flow path (t) is circulated between the cooling path that is circulated between the refrigerant evaporator (10) and the engine (11). The vehicle air conditioning system according to claim 8 or 9, wherein the heating path is switched by a flow path switching means (15, 16) controlled by an air conditioning control means (17). apparatus.

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