Heating, ventilation and / or air-conditioning device and system, in particular for a motor vehicle

Abstract

The invention relates to a heating, ventilation and / or air-conditioning device, in particular for a motor vehicle, the device comprising a housing (2) for circulating an air stream and a heat exchanger (22) for exchanging heat between at least a portion of the air stream and a heat transfer fluid of which the temperature and / or flow rate can be adjusted and which is intended to circulate in the heat exchanger (22), the housing (2) being configured so that a cross section of air flow through the heat exchanger (22) is constant irrespective of a desired air temperature at the outlet of the housing (2).

Description

[0001] DESCRIPTION

[0002] TITLE: Heating, ventilation and / or air conditioning device and system, in particular for motor vehicles

[0003] The invention relates to a device and a heating, ventilation and / or air conditioning system, in particular for a motor vehicle.

[0004] In this field, ventilation, heating and / or air conditioning boxes are known that are equipped with a heat exchanger for heating an air flow passing through the box. To have an unheated air flow, it is also known to provide the box with a bypass channel for the heat exchanger for heating. In order to regulate the temperature of the air flow, it is also known to use a flap, called a mixing flap, for mixing a hot portion of the air flow that has passed through the exchanger and a cold portion of the air flow that has passed through the bypass channel. The temperature of the air flow leaving the box thus depends on the hot and cold portions used for mixing.

[0005] A disadvantage of mixing flaps is that they result in an increase in the footprint of the enclosure.

[0006] The invention aims to at least partially overcome the above drawbacks and to this end proposes a heating, ventilation and / or air conditioning device, in particular for a motor vehicle, said device comprising a housing for circulating an air flow and a heating exchanger, intended for a heat exchange between at least a portion of said air flow and a heat transfer fluid of adjustable temperature and / or flow rate intended to circulate in said heating exchanger, said housing being configured so that an air passage section through said heating exchanger is constant regardless of a desired air temperature at the outlet of said housing, said housing being configured so that at least a first portion of the air flow, called the hot portion, passes through said heating exchanger, said housing comprising on either side of said heating exchanger bypass channels of said heating exchanger,said bypass channels being intended to be traversed by a second portion of said air flow, called the cold portion, said bypass channels being provided with a member for controlling a flow rate of said cold portion.

[0007] In other words, in the device according to the invention, there are no movable flaps, such as the mixing flaps of the state of the art, intended to obstruct more or less a circulation of air through the heating exchanger in said housing, neither upstream nor downstream of said heating exchanger, without excluding the possibility that there may be flaps for distributing the air flow at the outlet of the housing. Consequently, with the housing according to the invention, at least a portion of the air flow leaving the housing is systematically passed upstream through said heating exchanger.

[0008] It is thus possible to reduce the size of the housing, in particular in a direction, called X, of movement of the vehicle, while maintaining an adjustment of the temperature of the outgoing air flow, this adjustment being obtained at least in part, or even mainly, or even essentially by the temperature and / or the flow rate of heat transfer fluid circulating in the heating exchanger and not using mixing flaps. The bypass channels and their control members allow additional adjustment of the temperature of the air flow leaving the housing, possibly individualized according to the air outlet(s) targeted, this thanks to the location of said bypass channels relative to the heating exchanger.

[0009] According to various additional characteristics of the invention, which may be taken together or separately and which form as many embodiments of the invention:

[0010] - said air passage section kept constant through said heating exchanger represents an entire exchange surface of said heating exchanger,

[0011] - said control organs comprise a movable shutter in each of said bypass channels,

[0012] - said housing is configured so that a flow leaving said housing is formed, in a first configuration, exclusively of said hot portion and, in a second configuration, of a combination of said hot portion and said cold portion,

[0013] - a first of said bypass channels is located above said heating exchanger, - a second of said bypass channels is located below said heating exchanger,

[0014] - the shutters are mechanically independent so as to allow variable temperature stratification between a first outlet of the housing at the first of said bypass channels and a second outlet of the housing at the second of said channels,

[0015] - said housing comprises a stratification chamber configured to allow a combination of said hot portion, on the one hand, and on the other hand, of a part of the cold portion coming from said first bypass channel, called first combination, and / or of a part of the cold portion coming from said second channel, called second combination,

[0016] - said first bypass channel opens onto one or more air outlet orifices, called defrosting / demisting orifices, located at an upper wall of said housing,

[0017] - said second bypass channel opens onto one or more air outlet orifices, called rear orifices, located at the level of a lower wall of said housing,

[0018] - said stratification chamber opens onto: o One or more air outlet orifices, called side orifices, located in the upper part of said housing, o At least one air outlet orifice, called central, located halfway up said housing, and / or o At least one air outlet orifice, called floor orifice, located in the lower part of said housing,

[0019] - said side orifice(s) and / or said floor orifice(s) are located on side walls of said housing,

[0020] - said central orifice is located on a front wall of said housing.

[0021] - a depth of said stratification chamber corresponding to a distance between said heating exchanger and said front wall, a width of said side orifice(s) and / or said floor orifice(s) substantially corresponding to said depth,

[0022] - said heating exchanger is a condenser and / or a cooler of a refrigerant fluid intended to form said heat transfer fluid, - said heating exchanger is a radiator,

[0023] - said device comprises an air flow cooling exchanger located in said housing upstream of said heating exchanger in a flow direction of said air flow,

[0024] - said device is configured so that the entire air flow passes through said cooling exchanger,

[0025] - said cooling exchanger is an evaporator of said refrigerant fluid,

[0026] - said cooling exchanger and said heating exchanger extend in planes parallel to or forming between them an angle of less than 15°,

[0027] - said housing comprises an intermediate chamber configured for substantially horizontal air circulation from said cooling exchanger to said heating exchanger,

[0028] - said housing comprises a first partition configured to form a flow of said air flow in two zones allowing said air flow to have two different temperatures,

[0029] - said housing comprises a second partition configured to form a flow of said air flow in two separate layers coming from different air sources,

[0030] - said device comprises an air inlet box,

[0031] - said air inlet box is located on one side of said housing so that, in use, said housing and said air inlet box allow said evaporator to be supplied with an air circulation that is substantially horizontal and parallel to an extension plane of said cooling exchanger.

[0032] The invention also relates to a heating, ventilation and / or air conditioning system comprising a device as described above. Preferably, said system further comprises a circulation loop for said heat transfer fluid, said loop being configured to regulate a flow rate and / or a temperature of the heat transfer fluid through said heating exchanger.

[0033] The invention also relates to a method for regulating the heating system according to the preceding claim, the method comprising a determination of a flow rate of fluid circulating in the heating exchanger 22, the flow rate control of the cold portion in each of the bypass channels being carried out as a function of the flow rate of fluid circulating in the heating exchanger 22.

[0034] This makes it possible to compensate for the temperature gradient in the heat exchanger, which is greater at low flow rates. For example, if the fluid flow rate circulating in the heating exchanger is below a threshold value, the bypass channel on the colder side of the heating exchanger will be closed more than the bypass channel on the warmer side of the heating exchanger.

[0035] The invention will be better understood, and other aims, details, characteristics and advantages thereof will appear more clearly during the detailed explanatory description which follows, of at least one embodiment of the invention given by way of purely illustrative and non-limiting example, with reference to the appended schematic drawings among which:

[0036] [Fig 1] schematically illustrates in perspective an example of a device according to the invention;

[0037] [Fig 2] schematically illustrates the device of figure 1 according to a section plane marked P;

[0038] [Fig 3] schematically illustrates the device of figure 1 according to a section plane marked P'.

[0039] It should first be noted that the terms upstream and downstream used in the following description refer to the direction of circulation of the fluid in question. Furthermore, the terms "first", "second", "third", etc. are only used to distinguish the components concerned from each other and do not indicate either an order or a possible importance of said components.

[0040] As illustrated in Figure 1, the invention relates to a heating, ventilation and / or air conditioning device, in particular for a motor vehicle.

[0041] Said device comprises a housing 2 for circulating an air flow, intended for thermal treatment of said air flow. During its passage through said housing 2, said air flow is cooled, heated and / or dried. Said housing 2 is further advantageously configured to distribute the air flow towards air outlet orifices in relation to different zones of a passenger compartment of the vehicle towards which all or part of said air flow is intended to be projected, according to respective proportions depending on a choice made by a user via a control interface.

[0042] Said air outlet orifices comprise, in particular, one or more defrosting / demisting orifices 4a, located at an upper wall 6 of said housing 2. Said defrosting / demisting orifices 4a are intended to direct the air flow or a portion of the air flow passing through them towards a windshield of the vehicle.

[0043] Alternatively or cumulatively, said air outlet orifices comprise one or more orifices 4b, called rear orifices, located at a lower wall 8 of said housing 2. Said rear orifices 4b are intended to direct the air flow or a portion of the air flow passing through them towards rear passengers.

[0044] Alternatively or cumulatively, said air outlet orifices comprise one or more orifices 4c, called side orifices, located in the upper part of said housing 2. Said side orifices 4c are intended to direct the air flow or a portion of the air flow passing through them towards the face of the driver and / or the front passenger.

[0045] Alternatively or cumulatively, said air outlet orifices comprise one or more orifices 4d, called central orifices, located halfway up said housing 2. Said central orifices 4d are intended to direct the air flow or a portion of the air flow passing through them between the driver and the front passenger.

[0046] Alternatively or cumulatively, said air outlet orifices comprise one or more orifices 4e, called floor, located in the lower part of said housing 2. Said floor orifices 4e are intended to direct the air flow or a portion of the air flow passing through them towards the feet of the driver and / or the front passenger.

[0047] Said side orifice(s) 4c and / or said floor orifice(s) 4e are located here on side walls 10 of said housing 2. Said central orifice(s) are located on a front wall 12 of said housing 2.

[0048] Said device further comprises here an air inlet box 14. Said air inlet box 14 is intended to generate said air flow and to direct it towards said housing 2 via a passage channel 16 of said device.

[0049] Said air inlet box 14 comprises, for example, a first air inlet 18, intended to be supplied with air, called outside air, in particular air coming from outside the passenger compartment of the vehicle. It further comprises here a second air inlet 20, intended to be supplied with air, called inside air, in particular air coming from inside the passenger compartment of the vehicle. In Figure 2, said air flow passing through the housing 2 is illustrated by an arrow marked A. According to the embodiment shown, said device comprises flaps, called distribution flaps, making it possible to control an air flow through the outlet orifices 4a-4e. These are, for example, butterfly flaps and / or sliding flaps. Said distribution flaps are here located at an opening of said outlet orifices 4a-4e.

[0050] The device according to the invention comprises a heating exchanger 22, intended for heat exchange between at least a portion of said air flow A and a heat transfer fluid of adjustable temperature and / or flow rate intended to circulate in said heating exchanger 22 to transfer its calories to the air flow A.

[0051] Said heating exchanger 22 is, for example, a condenser and / or a cooler of a refrigerant fluid intended to form said heat transfer fluid. Said refrigerant fluid is, for example, a hydrofluorocarbon such as the fluid known as R134a, or a gas such as carbon dioxide, also known as R744 in its use as a refrigerant fluid. Alternatively, said heat exchanger 22 is, for example, a heating radiator and said heat transfer fluid is a heat transfer liquid such as a mixture of water and antifreeze, for example glycol.

[0052] Said device further comprises here a cooling exchanger 24 for said air flow A. This is, in particular, an evaporator for said refrigerant fluid. Said cooling exchanger 24 is configured to be traversed by said refrigerant fluid and to allow a heat exchange between said air flow A and said refrigerant fluid so as to transfer the calories from the air flow A to said refrigerant fluid.

[0053] Said cooling exchanger 24 is advantageously located in said housing 2 upstream of said heating exchanger 22, in a direction of flow of said air flow A. In this configuration, it is understood that said air flow A is previously cooled by said cooling exchanger 24, in the event of circulation of the refrigerant fluid inside the latter, and at least partly heated by said heating exchanger 22, in the event of circulation of said heat transfer fluid inside the latter.

[0054] According to the invention, said housing 2 is configured so that an air passage section through said heating exchanger is constant regardless of a desired air temperature at the outlet of said housing 2. In other words, there are no movable flaps capable of obstructing more or less a circulation of air through the heating exchanger 22 in said housing 2, neither upstream nor downstream of said heating exchanger 22, which does not exclude, as stated above, that there are flaps for distributing the air flow at the outlet of the housing 2. Consequently, at least a portion of the air flow leaving the housing systematically passes through said heating exchanger 22 before leaving the housing 2.

[0055] By eliminating the mixing flaps used in the state of the art for adjusting the temperature of the air flow passing through the housing, the invention makes it possible to reduce the size of the housing 2, in particular in a direction, called axial X, intended to correspond to a direction of movement of the vehicle. The adjustment of the temperature of the air flow A is however retained by using at least in part, or even mainly, or even essentially, the temperature and / or the flow rate of heat transfer fluid in the heating exchanger 22, this being to be considered in the embodiment illustrated for a given temperature of the air flow A at the outlet of the cooling exchanger 24.

[0056] Preferably, said air passage section kept constant through said heating exchanger 22 represents an entire exchange surface of said heating exchanger 22.

[0057] Said heat exchanger comprises, for example, a heat exchange bundle 26 extending between manifolds 28. Said bundle 26 comprises, in particular, a plurality of tubes for circulating said heat transfer fluid and fins or spacers located between the tubes and crossed by said air flow A. Said fins or spacers are thermally in contact with said tubes. Said heat exchange bundle 26 here forms said heat exchange surface within the meaning of the invention. Said manifolds 28 are configured to allow circulation of the heat transfer fluid between the heat exchange bundle and a circuit of said heat transfer fluid, not illustrated, external to said device. Said manifolds 28 are located in housings 30 formed by a body 32 of said housing 2. They extend here parallel to each other in a direction perpendicular to that of the figure.One of them is located above said beam 26 and the other below.

[0058] Said housing 2 is configured so that at least a first portion of the air flow, called the hot portion, identified by an arrow illustrated A1, passes through said heating exchanger 22. Said housing 2 further comprises one or more channels 34, 36 for bypassing said heating exchanger 22, intended to be traversed by a second portion of said air flow, called the cold portion, identified by arrows A2, A2'. In this way, if a part of the air flow A, namely the hot portion A1, systematically passes through the heating radiator 22, it is also possible to have a portion, namely the cold portion A2, A2', unheated. The temperature of the air flow A at the outlet can then be controlled not only by the temperature and / or the flow rate of the heat transfer fluid passing through the heating exchanger 22 but also by the quantity of air in each of the hot and cold portions.For the avoidance of doubt, according to the invention, however, there is no configuration where the flow leaving the housing is formed solely from the cold portion since the passage of air through the heating exchanger 22 is not obstructed.

[0059] In other words, said housing 2 is configured so that a flow leaving said housing is formed, in a first configuration, exclusively of said hot portion and, in a second configuration, of a combination of said hot portion and said cold portion.

[0060] Said bypass channel(s) 34, 36 are provided with a member 38 for controlling a flow rate of said cold portion. Said bypass members comprise, for example, a movable flap in each of said bypass channels. This is a butterfly valve.

[0061] A first 34 of said bypass channels is located above said heating exchanger 22. Said first bypass channel 34 is located more precisely here between the housing 30 for the manifold box 28 located above said heating exchanger 22 and an upper part of the body 32 of the housing 2. Said first bypass channel 34 opens onto the defrosting / demisting orifice 4a.

[0062] A first of the control members 38 is located in said first bypass conduit 34.

[0063] A second 36 of said bypass channels is located below said heat exchanger 22. Said second bypass channel 36 is located more precisely here between the housing 30 for the manifold 28 located below said heating exchanger 22 and a lower part of the body 32 of the housing 2. Said second bypass channel 38 opens onto the rear orifice(s) 4b. In the illustrated embodiment, said second bypass channel 36 comprises, in the direction of air circulation in said second bypass channel 36, a first and a second portion connected by an elbow. The first portion extends between a lower partition 40 and a lateral edge of the housing 30 for the manifold 28 located below said heating exchanger 22.The second portion extends between the lower wall 8 and a transverse edge 44 of the housing 30 for the manifold box 28 located below said heating exchanger 22.

[0064] A second of the control members 38 is located at an opening of said second bypass channel 36. An angular displacement of said second control member 38 is limited so as not to obstruct the passage of the hot portion A1 of the air flow through said heating exchanger 22.

[0065] Preferably, the shutters forming the control members 38 are mechanically independent so as to allow variable temperature stratification between a first outlet of the housing 2 at the level of the first 34 of said bypass channels and a second outlet of the housing at the level of the second 36 of said channels.

[0066] Said housing advantageously comprises a stratification chamber 46 configured to allow a combination of said hot portion A1, on the one hand, and on the other hand, of a part A2 of the cold portion coming from said first bypass channel, called first combination, and / or of a part A2' of the cold portion coming from said second channel, called second combination. In other words, said stratification chamber is located downstream of said heating exchanger 22 and of the bypass conduits 34, 36. It is here bordered by the upper wall 6, the lower wall 8 and / or the front wall 12 of the housing 2.

[0067] Said stratification chamber 46 opens onto said side air outlet(s) 4c, the central air outlet(s) 4d and / or the floor air outlet(s) 4e. It is configured so that the outlet portions of the air flow A passing through the different outlet orifices 4a-4e, when the corresponding distribution valves are open, are formed, in a stratified manner, of a combination of the cold portions A2, A2' and hot portions A1, when the bypass ducts 34, 36 are open, the quantity of air in each of the portions being able to vary from one outlet orifice to another and / or as a function of a degree of opening of said bypass ducts 34, 36.

[0068] Said stratification chamber 46 has a depth corresponding to a distance between said heating exchanger 22 and said front wall 12. A width of said side orifice(s) 4c and / or of said floor orifice(s) 4e corresponds substantially to said depth.

[0069] Said housing 2 is configured so that the first bypass channel 34 primarily supplies the defrosting / defogging orifice(s) 4a. Said stratification chamber 46 here comprises an upper zone configured to also supply the defrosting / defogging orifice(s) 4a. Said upper zone of the stratification chamber 46 extends between the housing 30 for the manifold box 28 located above said heating exchanger 22 and the upper face 6 of the housing 2.Said defrosting / demisting orifice(s) 4a are thus supplied, either by a part of the hot portion A1, namely the part passing through the upper zone of said stratification chamber 46, when said first bypass duct 34 is closed, or, in a stratified manner, by the combination of said part of the hot portion A1 passing through the upper zone of the stratification chamber 46 and the first part A2 of said cold portion, when said first bypass duct 34 is open.

[0070] Alternatively or cumulatively, said housing 2 is configured so that the second bypass channel 36 primarily supplies the rear outlet orifice(s) 4b. Said stratification chamber 46 comprises a lower zone opening jointly with the second bypass channel 36 into said rear outlet orifice(s) 4b. Said rear outlet orifice(s) 4b are thus supplied, either by a part of the hot portion A1, namely the part passing through said lower zone of said stratification chamber 46, when said second bypass conduit 36 ​​is closed, or, in a stratified manner, by the combination of said part of the hot portion A1 passing through the lower zone of said stratification chamber 46 and the second part A2' of said cold portion, when said second bypass conduit 36 ​​is open.

[0071] Alternatively or cumulatively, said housing 2 is configured so that the stratification chamber 46 primarily supplies the side, central and / or floor outlet(s) 4c-4e with said hot portion. As said first and second bypass ducts 34, 36 are in communication with said stratification chamber 46, a portion of the air passing through said first and second bypass ducts 34, 36, when they are open, also supplies, where appropriate, the side, central and / or floor outlet(s) 4c-4e and the combination of the hot portions A1 and cold portions A2, A2' then formed flows, in a stratified manner, through the latter.

[0072] It should be noted that, even if a mixture of the hot and cold portions may have occurred in the housing 2, such a mixture is intended to occur essentially downstream of said housing 2 before exiting into the passenger compartment, the housing 2 being preferentially configured for a flow of said hot and cold portions A1, A2, A2', in a stratified manner, in a layer, without or with very little mixing of said portions.

[0073] It is also recalled that, in accordance with the invention, regulation of the temperature of the hot portion A1 occurs by regulating the flow rate and / or the temperature of the heat transfer fluid passing through said heating exchanger 22, whether or not the bypass conduits 34, 36 are closed. Said hot portion A1 is possibly not reheated, which will be the case, for example, if the flow rate of the heat transfer fluid in said heating exchanger 22 is zero or close to zero, whether or not said hot portion A1 forms the entirety of the air flow A.

[0074] It should also be noted that said device, in particular said housing 2, is preferably configured so that the entire air flow A passes through said cooling exchanger 24. In other words, there are no bypass channels for said cooling exchanger 24.

[0075] Said cooling exchanger 24 and said heating exchanger 22 extend here in parallel planes or forming between them an angle of less than 15°. Such an arrangement further limits an axial size of said device.

[0076] According to the illustrated embodiment, said housing 2 comprises an intermediate chamber 50 between said cooling exchanger 24 and said heating exchanger 22. It is here configured for a substantially horizontal circulation of air from said cooling exchanger 24 to said heating exchanger 22. It opens into the first and second bypass ducts 34, 36. It is here bordered by the upper wall 6 and the lower wall 8 of the housing 2. Said lower partition 40 extends, for example substantially vertically, in said intermediate chamber, between a lower part of said cooling exchanger 24 and a lower part of said heating exchanger 22.

[0077] Said housing 2 advantageously comprises a first partition, located for example in a vertical plane, parallel to that of the figure, configured to form a flow of said air flow A in two zones Z1 and Z2 (visible in figure 1) on either side of said partition. Such a configuration makes it possible to have an air flow A at a different temperature in each of said zones Z1, Z2 at the outlet of said housing 2. Said cooling exchanger 24, said heating exchanger 22 and / or said control members 38 are made capable of allowing such independent control of the temperature in each of said zones Z1, Z2, being where appropriate split in each of them.

[0078] Alternatively or cumulatively, said housing 2 comprises a second partition 52, substantially horizontal. Such a partition 52 is here located upstream of said cooling exchanger 24 and / or in said intermediate chamber 50. Said second partition 52 is configured to form a flow of said air flow in two distinct layers N1 and N2 coming from different air sources.

[0079] As illustrated in Figure 3, a first of said air sources, circulating here in the upper part 54, is formed solely of the outside air coming from said first air inlet 18. A second of said air sources, circulating here in the lower part 56, is formed of a mixture of the outside air, coming from the first air inlet 18 and / or the inside air, coming from the second air inlet 20, through a nozzle 60 passing through an annular conduit 62 for supplying the outside air.

[0080] Said box 14 further comprises a generator 64 of said air flow A, in particular in the form of a radial blower. Said supply duct 62 and / or said nozzle 60 open into said blower 64, in particular internally and / or in a direction of an axis of rotation of said blower 64. Said blower 64 is configured to supply, for example tangentially, said upper and lower parts 54, 56 of said device each forming the layers N1 and N2, in particular via the passage duct 16 (see figures 1 and 2).

[0081] Said air inlet box 14 is preferably located on one side of said housing 2 so that, in use, said housing 2 and said air inlet box 14 allow said cooling exchanger 24 to be supplied with a substantially horizontal air circulation parallel to a plane of extension of said cooling exchanger 24. Such a configuration makes it possible to limit the axial size of said device by promoting its transverse extension.

[0082] The invention also relates to a heating, ventilation and / or air conditioning system comprising the device described above and a circulation loop for said heat transfer fluid. Said loop is configured to regulate a flow rate and / or a temperature of the heat transfer fluid through said heating exchanger 22.

[0083] In the variant with condenser or gas cooler, as already mentioned, the heat transfer fluid is formed by a refrigerant fluid. Said heat transfer fluid loop is then, for example, a loop of a heating, ventilation and / or air conditioning circuit configured so that said refrigerant fluid flowing through the loop follows a thermodynamic cycle such as the Carnot cycle. Said loop also comprises said cooling exchanger 24.

[0084] In the variant with a heating radiator, as already stated, said heat transfer fluid is a heat transfer liquid. Said heat transfer fluid loop advantageously comprises a bi-fluid exchanger allowing heat exchange between said heat transfer liquid circulating in the loop and a refrigerant fluid of a heating, ventilation and / or air conditioning circuit configured so that said refrigerant fluid flowing through said circuit follows a thermodynamic cycle such as the Carnot cycle. Said circuit also comprises said cooling exchanger 24.

Claims

CLAIMS 1. Heating, ventilation and / or air conditioning device, in particular for a motor vehicle, said device comprising a housing (2) for circulating an air flow and a heating exchanger (22), intended for a heat exchange between at least a portion of said air flow and a heat transfer fluid of adjustable temperature and / or flow rate intended to circulate in said heating exchanger (22), said housing (2) being configured so that an air passage section through said heating exchanger (22) is constant regardless of a desired air temperature at the outlet of said housing (2), said housing (2) being configured so that at least a first portion of the air flow, called the hot portion, passes through said heating exchanger (22), said housing (2) comprising channels (34, 36) for bypassing said heating exchanger (22) on either side of said exchanger, intended to be traversed by a second portion of said air flow, called the cold portion,said bypass channels being provided with a control member (38) for a flow rate of said cold portion., 2. Device according to the preceding claim in which said control members (38) comprise a movable flap in each of said bypass channels (34, 36).

3. Device according to the preceding claim in which the shutters are mechanically independent so as to allow variable temperature stratification between a first outlet of the housing (2) at a first (34) of said bypass channels and a second outlet of the housing (2) at a second (36) of said channels.

4. Device according to the preceding claim wherein the first (34) of said bypass channels is located above said heating exchanger (22) and / or the second (36) of said bypass channels is located below said heating exchanger (22).

5. Device according to the preceding claim wherein said housing (2) comprises a lamination chamber (46) configured to allow a combination of said hot portion, on the one hand, and on the other hand, of a part of the cold portion coming from said first bypass channel (34), called first combination, and / or of a part of the cold portion coming from said second channel (36), called second combination.

6. Device according to any one of claims 4 or 5 in which said first bypass channel (34) opens onto one or more air outlet orifices (4a), called defrosting / demisting orifices, located at the level of an upper wall (6) of said housing (2).

7. Device according to any one of claims 4 to 6 wherein said second bypass channel (36) opens onto one or more air outlet orifices (4b), called rear orifices, located at the level of a lower wall (8) of said housing (2).

8. Device according to any one of the preceding claims wherein said heating exchanger (22) is a condenser and / or a cooler of a refrigerant fluid intended to form said heat transfer fluid.

9. Device according to any one of the preceding claims, in which said device comprises a cooling exchanger (24) for the air flow located in said housing (2) upstream of said heating exchanger (22) in a direction of flow of said air flow, said cooling exchanger (24) and said heating exchanger (22) extend in parallel planes or forming between them an angle of less than 15°.

10. Heating, ventilation and / or air conditioning system comprising a device according to any one of the preceding claims and a circulation loop for said heat transfer fluid, said loop being configured to regulate a flow rate and / or temperature of the heat transfer fluid through said heating exchanger (22). 11: Method for regulating the heating system according to the preceding claim, the method comprising determining a flow rate of fluid circulating in the heating exchanger 22, controlling the flow rate of the cold portion in each bypass channels being produced according to the flow rate of fluid circulating in the heating exchanger 22.

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