Improved heating and / or air conditioning installation for a motor vehicle and motor vehicle having the same

Abstract

The invention relates to a heating and / or air-conditioning installation with a refrigerant circuit, which is arranged for a motor vehicle with a roof, comprising one or more external heat exchangers and one or more air delivery devices arranged for delivering air through the external heat exchanger(s), the at least one external heat exchanger and the air delivery device(s) being arranged for being positioned on the roof of the motor vehicle or being positioned partly or completely integrated in the roof of the motor vehicle, the air delivery device(s) comprising one or more radial fans, and the arrangement in the heating and / or air-conditioning installation being such that, in the arranged position, one or more rotational axes of one or more fan impellers of the radial fan(s) are oriented horizontally. Furthermore, the invention relates to a motor vehicle with such a heating and / or air-conditioning installation.

Description

Technical Field

[0001] The present invention relates to a heating and / or air conditioning system with a refrigerant circuit for a motor vehicle having a roof, such as, in particular, a bus, the heating and / or air conditioning system comprising one or more external heat exchangers and one or more air delivery devices for conveying air through the one or more external heat exchangers, wherein the one or more external heat exchangers and the one or more air delivery devices are configured to be positioned on top of the roof of the motor vehicle or partially or fully integrated within the roof of the motor vehicle.

[0002] Furthermore, the present invention relates to a motor vehicle having such heating and / or air conditioning facilities.

[0003] Motor vehicles are land transport vehicles that move by mechanical force without relying on tracks. Buses are a prime example of this.

[0004] In operation of the refrigerant circuit, the refrigerant is compressed in the compressor, then heat is extracted from the refrigerant in at least one heat exchanger serving as a gas cooler / condenser, and then the refrigerant is depressurized in at least one expansion mechanism, where it is cooled. After passing through at least one heat exchanger serving as an evaporator, the evaporated refrigerant finally returns to the compressor for recompression.

[0005] Heat exchange takes place in an external heat exchanger with the air that subsequently flows outward. The external heat exchanger is either indirectly connected to the refrigerant circuit via a heat transfer medium in the secondary circuit or directly connected to the refrigerant circuit. Background Technology

[0006] Heating and / or air conditioning systems with refrigerant circuits are known for use in motor vehicles with roofs, where the air handling area is located on the roof. DE102019127796 A1 discloses a roof-mounted air conditioning unit in which an air delivery device for conveying air through an external heat exchanger is positioned on the roof upstream of the external heat exchanger in the airflow direction, and the rotation axis of the fan impeller extends vertically. Here, the air delivery device loads a pressure space with compressed air, making it disadvantageously necessary to be constructed to be sufficiently pressure-resistant. In a heating and air conditioning system, particularly located on the roof of a bus, disclosed in DE102013008491 A1, the air delivery device, although downstream of the external heat exchanger in the airflow direction, has its fan impeller, configured as an axial-flow fan, extending vertically perpendicular to the horizontal air exhaust side of the external heat exchanger. In the roof-mounted air conditioning system disclosed in DE10345997 A1, particularly for buses, the axis of rotation of the axial fan of the air delivery device associated with the external heat exchanger is also vertically oriented. Numerous other embodiments of roof-mounted air conditioning systems for motor vehicles exist, in which the axial fan with a vertical axis of rotation is configured to deliver air through one or more external heat exchangers. While these embodiments are relatively flat, they have the disadvantages of: a risk of fan impeller icing in cold conditions, and higher volume, pressure instability, and electrical power consumption at the design point compared to more efficient radial fans. These disadvantages are particularly prevalent in motor vehicles with inherently high roof structures, and are typically found in buses with electric drives.

[0007] US6134909 A discloses a roof-mounted air conditioning system for motor vehicles, in which the disadvantages of axial fans still exist, even though the axis of rotation of the fan impeller of the axial fan extends horizontally to deliver air through an external heat exchanger.

[0008] DE102015118557 A1 discloses a roof-mounted air conditioning system with an evaporator unit for use on the roof of a bus, the evaporator unit having an airflow passage with an internal heat exchanger for cooling air for the interior space of the vehicle.

[0009] WO2007 / 042065 A1 shows an air conditioning device for a motor vehicle having a radial fan for conveying air through a condenser, but the air conditioning device is not a top-mounted air conditioning device because it has openings on its lower side for introducing and drawing in ambient air.

[0010] Therefore, the problem upon which the invention described herein is based is that existing heating and / or air conditioning systems with refrigerant circuits for motor vehicles are inadequate, particularly in terms of efficiency, volume, winter suitability, and pressure instability, having one or more external heat exchangers positioned on or partially or fully integrated in the roof of the vehicle and air delivery means associated with the external heat exchangers. Summary of the Invention

[0011] Therefore, the objective is to provide an improved heating and / or air conditioning system for a motor vehicle having a refrigerant circuit, the heating and / or air conditioning system having one or more external heat exchangers positioned on top of or partially or fully integrated in the roof of the vehicle and one or more air delivery devices associated with the external heat exchangers.

[0012] The corresponding purpose is to provide motor vehicles equipped with such heating and / or air conditioning facilities.

[0013] The problem upon which the invention described herein is based is solved by the features listed below. The problem is solved by the following features: a heating and / or air conditioning system with a refrigerant circuit for a motor vehicle having a roof, such as, in particular, a bus, includes one or more external heat exchangers and one or more air delivery devices for conveying air through one or more external heat exchangers, wherein at least one or more external heat exchangers and the one or more air delivery devices are positioned on top of or partially or fully integrated within the roof of the motor vehicle, and the one or more air delivery devices include one or more radial fans, and the arrangement in the heating and / or air conditioning system is such that, in the arranged positioning, one or more axes of rotation of one or more fan impellers of one or more radial fans are horizontally oriented, one or more external heat exchangers are positioned upstream of one or more radial fans in the airflow direction, such that the main airflow direction of the air flowing through at least one or more external heat exchangers to one or more radial fans extends horizontally, and air can be blown upward from the heating and / or air conditioning system by one or more air delivery devices in at least the vertical main airflow direction.

[0014] In a horizontally extending main airflow direction, the horizontal component of the airflow direction is the only component or is at least greater than its vertical component. In a vertically extending main airflow direction, the vertical component of the airflow direction is the only component or is at least greater than its horizontal component.

[0015] The heating and / or air conditioning system offers the following advantages: lower volume, pressure instability, and lower power consumption at the design point compared to air delivery systems with axial fans, and no risk of fan impeller icing in cold conditions. The more efficient radial fans have higher power output, thereby improving the airflow response of at least one external heat exchanger. Furthermore, condensate removal is more targeted in radial fans than in axial fans.

[0016] Advantageous designs, developments and improvements of the subject matter of this invention are described below.

[0017] Preferably, one or more radial-flow fans of the air delivery device are configured such that at least one or more of their air inlets and / or the blades of one or more fan impellers are made of plastic. This saves weight and cost compared to metal.

[0018] Preferably, one or more fan impellers of one or more radial-flow fans have backward-curved blades with respect to their set rotation direction. The efficiency is higher in backward-curved blades compared to forward-curved blades.

[0019] Preferably, in heating and / or air conditioning facilities, the arrangement is such that the airflow from at least one external heat exchanger to one or more radial fans extends parallel to one or more axes of rotation of at least one fan impeller. Thus, the air preferably flows into the respective radial fan perpendicularly to the air inlet opening without deflection.

[0020] The following embodiment is advantageous, in which one or more external heat exchangers are arranged such that their respective air inlet and air outlet sides are perpendicular to the rotation axis of the fan impeller of the respective radial-flow fan. Therefore, at least one external heat exchanger is vertically positioned during operation, which is advantageous for its airflow orientation and results in less contamination.

[0021] According to an advantageous improvement of the heating and / or air conditioning system, one or more external heat exchangers may be configured to switch between evaporator operation and gas cooler / condenser operation, wherein the one or more external heat exchangers may operate as evaporators in heat pump operation of the refrigerant circuit and as gas coolers / condensers in air conditioning operation of the refrigerant circuit. The heating and / or air conditioning system, which can be so switched, can operate to heat or cool air for the vehicle interior space depending on the switching of the refrigerant circuit.

[0022] An external heat exchanger that can operate as a gas cooler / condenser can be configured to function as a condenser for a refrigerant intended to operate subcritically in a high-pressure region of the refrigerant circuit, or it can be configured to function as a gas cooler for a refrigerant intended to operate supercritically in a high-pressure region of the refrigerant circuit. Alternatively, the external heat exchanger can be configured such that it can be used not only as a gas cooler but also as a condenser.

[0023] According to an advantageous embodiment, at least a portion of the upper side of the housing of the heating and / or air conditioning system is configured as an area on the upper side of the roof, and the housing has one or more lateral air inlet openings for air to be drawn in, directly in front of the air inlet side of at least one external heat exchanger, and one or more air outlet openings above for air directly from one or more radial fans. Thus, air drawn in from the outside can efficiently reach at least one external heat exchanger from at least one lateral air inlet opening without deflection and finally be blown directly upwards from the heating and / or air conditioning system from at least one radial fan. The air duct is particularly efficient if the heating and / or air conditioning system includes an air-impermeable air passage section in its sidewalls for horizontally guiding air from the air outlet side of at least one external heat exchanger to the air inlet of at least one radial fan, wherein at least one axis of rotation of at least one fan impeller extends centrally relative to the vertical height (H) of the air passage section.

[0024] Preferably, in the configuration of one or more air delivery devices, the radial fans of the air delivery devices are arranged such that the fan impellers of the radial fans are arranged in a horizontal row, with their rotation axes oriented horizontally and parallel to each other to the longitudinal axis of the vehicle, thereby making full use of the length of the roof for the number of radial fans of the air delivery devices.

[0025] According to an advantageous embodiment of the heating and / or air conditioning system, one or more external heat exchangers and an air delivery device for conveying air through the one or more external heat exchangers are disposed in a first sub-region of the heating and / or air conditioning system. After being disposed on or partially integrated into the roof, the first sub-region is positioned between second and third sub-regions of the heating and / or air conditioning system disposed to the right and left of the first sub-region, parallel to the longitudinal axis of the vehicle. The second and third sub-regions each include one or more internal heat exchangers and one or more additional air delivery devices, the additional air delivery devices being configured to convey air through the internal heat exchangers and further into the interior space of the vehicle. A housing component covering the first sub-region has one or more lateral air inlet openings, extending at least therefrom beyond the adjacent housing component covering the second or third sub-region. This heating and / or air conditioning system is particularly well-suited for large embodiments, such as buses. A higher first sub-region extends centrally along the roof, wherein the lateral air inlet openings for the air to be drawn in are not obstructed from the outside.

[0026] The objective of providing a motor vehicle is achieved by a motor vehicle having a roof and heating and / or air conditioning facilities according to the invention, wherein at least the external heat exchangers of the heating and / or air conditioning facilities and the arrangement of the heating and / or air conditioning facilities for conveying air through one or more external heat exchangers and one or more air delivery devices are positioned on the roof or partially or fully integrated in the roof.

[0027] The above description of the heating and / or air conditioning facilities according to the invention applies correspondingly to their advantages, as well as advantageous embodiments and improvements. In particular, buses are advantageous as motor vehicles according to the invention. In buses, such efficient, low-noise, and winter-suitable roof-mounted facilities are especially advantageous where a higher roof structure already exists. Attached Figure Description

[0028] Embodiments of the present invention are illustrated with reference to the accompanying drawings.

[0029] The attached diagram shows

[0030] Figure 1 An air guiding area with an external heat exchanger is shown schematically in a vertical cross-section of an embodiment of a heating and / or air conditioning facility according to the present invention;

[0031] Figure 2 Another embodiment of the heating and / or air conditioning facility according to the invention is shown schematically in a vertical longitudinal section in the region of the radial fan;

[0032] Figure 3 Another embodiment of the heating and / or air conditioning facility according to the invention is shown schematically without a housing cover; and

[0033] Figure 4 A schematic diagram illustrating a heating and / or air conditioning facility according to the present invention is shown in the figure. Figure 3 The embodiment shown has a housing cover on the roof of a motor vehicle. Detailed Implementation

[0034] All accompanying drawings should be interpreted schematically. To improve clarity, proportional depictions are omitted.

[0035] exist Figure 1 and Figure 2 Arrows are used to indicate the direction of airflow.

[0036] exist Figure 1 The diagram schematically illustrates, in a vertical cross-section, an air guiding region 3 provided with an external heat exchanger 5 according to an embodiment of a heating and / or air conditioning facility 1 based on the present invention. The heating and / or air conditioning facility 1 is provided for a motor vehicle with a roof, such as a bus. The external heat exchanger 5 is located within the housing 23 of the heating and / or air conditioning facility 1. The external heat exchanger is configured as an air-refrigerant heat exchanger and is connected to a refrigerant circuit. The external heat exchanger 5 has a cuboid shape. The external heat exchanger is positioned upstream of a radial fan 7 of an air delivery device 9 in the airflow direction. The air delivery device is used to deliver air through the external heat exchanger 5. The air guiding region 3, having the external heat exchanger 5 and the air delivery device 9, is positioned for placement on or partially integrated into the roof of the motor vehicle.

[0037] In this configuration, the fan impeller 11 of the radial fan 7 has a horizontally oriented axis of rotation 13. This horizontally extending axis of rotation 13 is perpendicular to the air inlet side 15 and air outlet side 17 of the external heat exchanger 5, such that the airflow direction from the external heat exchanger 5 to the radial fan 7 is parallel to the axis of rotation 13. Therefore, the main airflow direction of the air flowing through the external heat exchanger 5 to the radial fan 7 extends horizontally. An airtight air passage section 19 with impermeable sidewalls guides air horizontally from the air outlet side 17 of the external heat exchanger 5 to the air inlet 21 of the radial fan 7, wherein the axis of rotation 13 of the fan impeller 11 extends centrally relative to the vertical height H of the air passage section 19. Alternatively, an embodiment of the heating and / or air conditioning system 1 may be considered in which the axis of rotation 13 of the fan impeller 11 is eccentric relative to the vertical height of the air passage section 19.

[0038] During operation, air drawn in through air inlet 21 by the radial fan 7 of the air delivery device 9 is blown upward from the heating and / or air conditioning unit 1 in the main vertical airflow direction. For this purpose, the housing 23 has an air outlet 25 directly above the radial fan 7. The housing 3 has a lateral air inlet 27 upstream of the air inlet side 15 of the external heat exchanger 5 in the airflow direction. During operation, air is drawn in from the outside through the air inlet 27 and blown out again through the air outlet 25 after the through-flow air guiding area 3. The blades 29 of the fan impeller 11 of the radial fan 7 are bent backward in their set rotation direction and are made of hard plastic, as with the air inlet 21. An embodiment of the radial fan 7 in which the blades 29 of the fan impeller 11 are bent forward in the set rotation direction is also contemplated. Furthermore, an embodiment in which the blades 29 and / or the air inlet 21 of the radial fan 7 are made of metal is also contemplated.

[0039] The external heat exchanger 5 can be configured to switch between evaporator operation and gas cooler / condenser operation. The external heat exchanger functions as an evaporator in heat pump operation of the refrigerant circuit and as a gas cooler / condenser in air conditioning operation of the refrigerant circuit. Other embodiments of the external heat exchanger 5 are also conceivable, such as an air-liquid heat exchanger, in which the liquid is the heat transfer medium connected to a secondary circuit on the refrigerant circuit via another heat exchanger.

[0040] exist Figure 2 Another embodiment of the heating and / or air conditioning system 1 according to the invention is schematically shown in a vertical longitudinal section in the region of the radial fan 7. The heating and / or air conditioning system has a refrigerant circuit and is provided for a motor vehicle having a roof, such as a bus roof. In this case, there are three radial fans 7, but it is not limited thereto. In the case where the installation is located on the roof or partially or fully integrated within the roof, the fan impellers 11 of the radial fans 7 of the air delivery device 9 are arranged in a horizontal row, with their rotation axes 13 oriented horizontally parallel to each other transversely to the longitudinal axis of the motor vehicle. The blades 29 of the three fan impellers 11 are curved rearward in the direction of rotation and are made of plastic, as with the air inlets. In operation, air from the outside flows horizontally through the air inlet openings through an external heat exchanger, which is also provided for roof mounting as with the air delivery device 9, to the three radial fans 7, i.e. Figure 2From the direction of observation. Here, air drawn in with a horizontal airflow main direction transverse to the longitudinal axis of the motor vehicle is then turned in the corresponding radial fan 7 and blown upward from the heating and / or air conditioning unit 1 through three air outlet openings 25 belonging to the cover of the housing 23 in a vertical airflow main direction. The radial fan housing 31 of the radial fan 7 has an airtight partition wall relative to the respective adjacent radial fans 7. A variant with a common radial fan housing 31 is also contemplated, which does not have partition walls between the individual radial fans 7. The corresponding air outlet opening 25 is located above the corresponding fan impeller 11, and thus directly above the corresponding radial fan 7.

[0041] exist Figure 3 Another embodiment of the heating and / or air conditioning system 1 according to the invention is shown schematically without a housing cover. The heating and / or air conditioning system is integrated in the roof 41 of a motor vehicle 43 configured as a bus in the upper part. The heating and / or air conditioning system has four sub-regions, wherein the fourth sub-region 45, located transversely to the longitudinal axis of the motor vehicle 43 in the rear region, contains a compressor 47 for a refrigerant circuit. Three sub-regions 49, 51, and 53, located in front of it, are oriented parallel to the longitudinal axis of the motor vehicle 43, wherein the first sub-region 49 is centrally located between the second and third sub-regions 51, 53 laterally to it. The first sub-region 49 has an external heat exchanger 5 and an air delivery device 9 for conveying air through the external heat exchanger 5, the air delivery device having three radial fans 7, the number of which is not limited. The fan impellers of the radial fans 7 are arranged in a horizontal row, their axes of rotation oriented transversely to the longitudinal axis of the motor vehicle 43 and parallel to each other. The blades of the three fan impellers are curved backward in the direction of rotation and are made of plastic, as are the air inlets. Alternatively, the blades and / or air inlets of the radial fan 7 may be made of metal.

[0042] The air inlet side 15 and air outlet side of the external heat exchanger 5 are perpendicular to the rotation axis of the fan impeller of the corresponding radial fan 7. The external heat exchangers 5 are arranged in a horizontal row, parallel to the longitudinal axis of the motor vehicle 43, on their narrow lower sides. The external heat exchangers are upstream of the radial fan 7 in the airflow direction of the air drawn from the outside. The main airflow direction of the air flowing through the external heat exchangers 5 to the radial fan 7 extends horizontally. In operation, the airflow from the external heat exchangers 5 to the radial fan 7 has a flow direction parallel to the rotation axis of the fan impeller. With the help of the three radial fans 7 of the air delivery device 9, the air drawn by the radial fans can be blown upward from the heating and / or air conditioning unit 1 in at least the vertical main airflow direction. In this case, the external heat exchanger 5 can be configured to switch between evaporator operation and gas cooler / condenser operation, wherein the external heat exchanger can be used as an evaporator in heat pump operation of the refrigerant circuit and as a gas cooler / condenser in air conditioning operation of the refrigerant circuit.

[0043] In the second sub-region 51 and the third sub-region 53, there are heating batteries 55 and internal heat exchangers 57, respectively, in limited quantities, and each has another air delivery device 59 for delivering air through the internal heat exchangers 57 and further into the vehicle interior space 61. For this purpose, the two additional air delivery devices 59 have multiple dual-flow fans that draw air through the respective internal heat exchangers 57 and blow the air into air ducts leading to the vehicle interior space 61.

[0044] The first sub-region 49, together with its external heat exchanger 5 and air delivery device 9, extends beyond the adjacent second and third sub-regions 51 and 53 beyond the heating and / or air conditioning facility 1.

[0045] exist Figure 4 The diagram schematically illustrates a heating and / or air conditioning facility 1 according to the present invention. Figure 3 The embodiment shown has a cover belonging to the housing 23, the upper side of which forms a region on the upper side of the roof 41. As in Figure 3As in the example, the heating and / or air conditioning unit 1 is integrated in the roof 41 of the motor vehicle 43, which is configured as a bus, and is used to heat or cool the air in the interior space 61 of the motor vehicle. The housing component 65 covering the first sub-region 49 has an air outlet 25 with a mesh grille directly above the radial fan. Air can be blown upwards from the heating and / or air conditioning unit 1 directly from the radial fan in a vertical airflow direction through the air outlet 25. Furthermore, the housing component 65 covering the first sub-region 49 has an air inlet 27 with a mesh grille on one of its longitudinal sides. The air inlet 27 for air to be drawn from the outside is directly in front of the air inlet side of the external heat exchanger. The housing component 65 covering the first sub-region 49 extends not only beyond the adjacent housing component 67 covering the second sub-region 51, but also beyond the adjacent housing component 69 covering the third sub-region 53 on the other longitudinal side. Here, the housing component 65 covering the first sub-region 49 extends beyond the adjacent housing component 67 covering the second sub-region 51 on the side of the air inlet opening 27, so that the air inlet opening 27 is fully exposed and not blocked by the adjacent housing component 67 from the outside air.

Claims

1. A heating and / or air conditioning system (1) with a refrigerant circuit for a motor vehicle (43) having a roof (41), such as, particularly for a bus, said heating and / or air conditioning system comprising one or more external heat exchangers (5) and one or more air delivery devices (9) for supplying air through said one or more external heat exchangers (5), wherein at least said one or more external heat exchangers (5) and said one or more air delivery devices (9) are arranged for being positioned on top of the roof of the motor vehicle (43) or partially or fully integrated within the roof (41) of the motor vehicle, characterized in that, The one or more air delivery devices (9) include one or more radial fans (7), and are arranged in the heating and / or air conditioning facility (1) such that in the arranged position - The one or more fan impellers (11) of the one or more radial flow fans (7) have one or more rotating axes (13) oriented horizontally. - The one or more external heat exchangers (5) are positioned upstream of the one or more radial fans (7) in the airflow direction, such that the main airflow direction of the air flowing from at least the one or more external heat exchangers (5) to the one or more radial fans (7) extends horizontally, and - Air can be blown upward from the heating and / or air conditioning facility (1) by the one or more air delivery devices (9) in at least the vertical main direction of air flow.

2. The heating and / or air conditioning facility (1) according to claim 1, characterized in that, The air delivery device (9) is configured such that at least one or more air inlets (21) of the radial flow fan and / or the blades (29) of the one or more fan impellers (11) are made of plastic.

3. The heating and / or air conditioning facility (1) according to claim 1 or 2, characterized in that, One or more fan impellers (11) of the one or more radial fans (7) have backward-curved blades (29) with respect to their set rotation direction.

4. The heating and / or air conditioning facility (1) according to any one of claims 1 to 3, characterized in that, The arrangement is such that the airflow direction from at least one of the external heat exchangers (5) to the one or more radial fans (7) extends parallel to the one or more rotation axes (13) of the at least one fan impeller (11).

5. The heating and / or air conditioning facility (1) according to any one of claims 1 to 4, characterized in that, The one or more external heat exchangers (5) are configured such that their respective air inlet side (15) and air outlet side (17) are perpendicular to the rotation axis (13) of the fan impeller (11) of the respective radial fan (7).

6. The heating and / or air conditioning facility (1) according to any one of claims 1 to 5, characterized in that, The one or more external heat exchangers (5) can be configured to switch between evaporator operation and gas cooler / condenser operation, wherein one or more external heat exchangers can operate as an evaporator in the heat pump operation of the refrigerant circuit and as a gas cooler / condenser in the air conditioning operation of the refrigerant circuit.

7. The heating and / or air conditioning facility (1) according to any one of claims 1 to 6, characterized in that, At least a portion of the upper side of the housing (23) of the heating and / or air conditioning facility is set as the area on the upper side of the roof (41), and the housing (23) has one or more lateral air inlet openings (27) for air to be drawn in, directly in front of the air inlet side (15) of the at least one external heat exchanger (5), and has one or more air outlet openings (25) above for air directly from the one or more radial fans (7).

8. The heating and / or air conditioning facility (1) according to any one of claims 1 to 7, characterized in that, The heating and / or air conditioning facility includes an air passage section (19) at its sidewall that is impermeable to air, the air passage section being used to horizontally guide air from the air exhaust side (17) of the at least one external heat exchanger (5) to the air inlet (21) of the at least one radial fan (7), wherein the at least one axis of rotation (13) of the at least one fan impeller (11) extends centrally relative to the vertical height (H) of the air passage section (19).

9. The heating and / or air conditioning facility (1) according to any one of claims 1 to 8, characterized in that, In the positioning of the one or more air delivery devices (9), the radial fan (7) of the air delivery device is arranged such that the fan impeller (11) of the radial fan is arranged in a horizontal row, and its rotation axis (13) is oriented horizontally and parallel to each other transversely to the longitudinal axis of the motor vehicle (43).

10. The heating and / or air conditioning facility (1) according to any one of claims 1 to 9, characterized in that, The one or more external heat exchangers (5) and the air delivery device (9) for delivering air through the one or more external heat exchangers (5) are disposed in a first sub-region (49) of the heating and / or air conditioning facility (1), and after being disposed on or partially integrated into the roof (41), the first sub-region (49) is positioned between a second sub-region (51) and a third sub-region (53) of the heating and / or air conditioning facility (1) disposed to the right and left of the first sub-region parallel to the longitudinal axis of the motor vehicle (43), wherein the second sub-region (51) is disposed in the third sub-region (53) of the heating and / or air conditioning facility (1). 51) and the third sub-region (53) each include one or more internal heat exchangers (57) and one or more additional air delivery devices (59), and the additional air delivery devices (59) are configured to deliver air through the internal heat exchangers (57) and further into the interior space (61) of the motor vehicle, and the housing component (65) covering the first sub-region (49) has one or more lateral air inlet openings (27), and extends at least there beyond the adjacent housing components (67, 69) covering the second sub-region (51) or the third sub-region (53).

11. A motor vehicle (43) having a roof (41) and a heating and / or air conditioning system (1) according to any one of claims 1 to 10, characterized in that, At least the external heat exchanger (5) of the heating and / or air conditioning facility and the arrangement of the heating and / or air conditioning facility for conveying air through the one or more external heat exchangers (5) are positioned on top of the vehicle roof or partially or fully integrated in the vehicle roof (41).

12. The motor vehicle (43) according to claim 11, characterized in that, The motor vehicle in question is a bus.

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