Roof arrangement for a building

Abstract

The invention relates to a roof arrangement (1) for a building, comprising a roof structure (4), a roof covering (6) supported by the roof structure (4), and a ventilation unit (3), wherein the ventilation unit (3) has a first ventilation opening (17) facing the outside environment and a second ventilation opening (18) facing the inside, which are fluidically connected to each other via a fan (13) and a heat exchanger (14), wherein the fan (13) and the heat exchanger (14) are located in a device housing (12) arranged at least partially in the roof structure (4), and the first ventilation opening (17) is configured in a first ventilation housing (15) arranged on one side of the device housing (12), and the second ventilation opening (18) is configured in a second ventilation housing (16) arranged on the other side of the device housing (12).It is provided that the first ventilation housing (15) has the first ventilation opening (17) on a side of the roof skin (6) facing the roof structure (4).

Description

[0001] The invention relates to a roof arrangement for a building, comprising a roof structure, a roof skin supported by the roof structure and a ventilation device, wherein the ventilation device has a first ventilation opening on the outside environment side and a second ventilation opening on the inside side, which are fluidically connected to one another via a fan and a heat exchanger, wherein the fan and the heat exchanger are present in a device housing arranged at least in regions in the roof structure and the first ventilation opening is configured in a first ventilation housing arranged on one side of the device housing and the second ventilation opening is configured in a second ventilation housing arranged on the other side of the device housing.

[0002] For example, the prior art document DE 10 2009 053 652 B4 is known. This document describes a roof penetration through a roof surface for a pipeline with condensate drainage for ventilation or exhaust gas discharge. It consists of a base plate, a through-pipe extending through the roof surface, a hood pipe, and a blow-out head. The through-pipe is sealingly connected to the base plate via a press bead, which is connected to roof battens. A plug-in pipe is plugged onto the top of the through-pipe, which forms a spherical head at its upper free end, and the spherical head, together with the lower end of the hood pipe, forms a spherical gap at the upper end of the plug-in pipe.

[0003] Furthermore, DE 32 17 137 A1 discloses a roof ventilator with conveying devices and air ducts for supply (fresh) and / or exhaust air, whereby the supply and exhaust air undergo heat exchange. It is provided that a fan conveys the supply and exhaust air via separately arranged air ducts.

[0004] The document US 6 185 880 B1 also describes a roof ventilation system, in particular for a conservatory roof, comprising a hood which can be fastened to a ridge component of the roof and an electrically operated rotor within the hood, wherein the hood has pairs of formations on the end extension which can be arranged on the underside of the ridge component and wherein wedges are provided for insertion between the formations in order to press the formations outwards in order to hold the formations in place.

[0005] The object of the invention is to propose a roof arrangement for a building which has advantages over known roof arrangements, in particular enabling reliable ventilation of the building largely independent of ambient conditions and / or ensuring simple installation.

[0006] This is achieved according to the invention with a roof arrangement for a building having the features of claim 1. It is provided that the first ventilation housing has the first ventilation opening on a side of the roof skin facing the roof structure.

[0007] Advantageous embodiments with useful further developments of the invention are specified in the dependent claims. It should be noted that the exemplary embodiments explained in the description are not limiting; rather, any variations of the features disclosed in the description, the claims, and the figures are feasible.

[0008] The roof arrangement is preferably a component of the building, but can of course also be separate from it. It comprises at least a roof, comprising the roof structure and roof skin, as well as the ventilation unit. The roof forms at least partially a building envelope of the building, with the building envelope being arranged between the building's exterior environment and its interior, thus separating them from each other. The roof essentially consists of the roof structure and the roof skin.

[0009] The roof structure comprises, for example, one or more rafters and one or more roof battens. The roof battens can be divided into counter battens and support battens, whereby the presence of counter battens is optional. The support battens are usually arranged at an angle, in particular perpendicular, to the rafters and attached to them. The counter battens, on the other hand, preferably run at an angle with respect to the support battens, in particular perpendicular to them, and / or parallel or at least essentially parallel to the rafters. In addition to these components, the roof can have insulation, which is designed, for example, as under-rafter insulation, between-rafter insulation and / or above-rafter insulation. In order to better distinguish the insulation from other elements, the insulation is also referred to as roof insulation in this description.

[0010] The roof skin is arranged or attached to the outside of the roof structure, thus defining the roof structure's boundary towards the building's exterior. The roof skin refers, in particular, to a roof covering or roof waterproofing. The roof covering comprises, for example, a plurality of roof covering elements, such as a plurality of roof tiles, roof shingles, or the like. Towards the inside, i.e., towards the interior, the roof structure is preferably defined by an interior wall. For this purpose, the interior wall is arranged and / or attached to the roof structure on its side facing the interior.

[0011] The ventilation unit is used to ventilate the interior of the building, which is separated from the outside environment by the roof, i.e., by the roof structure and the roof membrane. Ventilation can take the form of ventilation and / or exhaust ventilation. During ventilation, air from the outside environment is supplied to the interior via the ventilation unit, i.e., air is drawn from the outside environment towards the interior, in particular into the interior. Exhaust ventilation involves the removal of air from the interior towards the outside environment by means of the ventilation unit; the ventilation unit therefore draws air from the interior towards the outside environment, in particular into the outside environment.

[0012] The air taken from the outside environment can also be referred to as fresh air, and the air supplied to the interior space as supply air. Conversely, air taken from the interior space can be referred to as exhaust air and air supplied to the outside environment as exhaust air. This means that ventilation occurs by conveying fresh air from the outside environment towards the interior space, into which it enters as supply air. Ventilation occurs accordingly by conveying exhaust air from the interior space towards the outside environment, into which it subsequently exits as exhaust air. During ventilation, there is a supply air flow in the ventilation unit in a first flow direction, and during exhaust ventilation there is an exhaust air flow in a second flow direction opposite to the first flow direction.

[0013] The ventilation unit has two ventilation openings: the first ventilation opening and the second ventilation opening. The first ventilation opening is located on the outside environment side, i.e., on the side of the ventilation unit that faces the outside environment in terms of flow. The second ventilation opening is located on the inside room side, i.e., on the side of the ventilation unit that faces the interior in terms of flow. The first ventilation opening and the second ventilation opening are connected to each other via the fan and the heat exchanger. This means that air flowing between the two ventilation openings flows through the fan and the heat exchanger.

[0014] The fan is intended and designed to convey air through the ventilation unit. It is preferably an axial fan, but can of course also be designed as a radial fan or a diagonal fan. The heat exchanger serves in particular to temporarily store heat in the ventilation unit. Accordingly, it is designed as a regenerative heat exchanger or a regenerator. The fan and the heat exchanger are located in the unit housing, which is fluidically arranged between the first ventilation housing, which has the first ventilation opening, and the second ventilation housing, which has the second ventilation opening. Air flowing between the ventilation openings therefore always flows through the unit housing and thus through the fan and the heat exchanger.

[0015] Preferably, the ventilation unit is designed as a push-pull ventilation unit and thus temporarily ventilates and temporarily ventilates the interior. The ventilation unit is therefore operated in such a way that the air flows alternately through the ventilation unit, in particular the unit housing, in the first flow direction and in the second flow direction. When a first of the flow directions is present, heat from the air is introduced into the heat exchanger and when the other flow direction is present, heat is discharged from it again. In particular, the heat exchanger absorbs heat while the interior is being ventilated, i.e. air is conveyed from the interior towards the outside environment. The absorbed heat is subsequently released back into the air conveyed from the outside environment towards the interior during ventilation of the room. This achieves a high level of energy efficiency in the building.The fan preferably changes the flow direction periodically, in particular with a cycle time of at least 30 s and at most 120 s, preferably at least 45 s and at most 90 s or approximately or exactly 60 s.

[0016] Of course, it can also be provided – purely optionally – that the ventilation unit has several first ventilation openings and several second ventilation openings, each of which is fluidly connected to one another via a fan and a heat exchanger. With such a design of the ventilation unit, the fans can be operated in opposite flow directions, so that at least one of the fans ventilates the interior while at least one other fan simultaneously ventilates the interior. The fans – as already explained – periodically change the flow direction, so that each of the heat exchangers functions as a regenerator. The heat exchanger is preferably made of ceramic.

[0017] The two ventilation housings, in which the ventilation openings are formed, are located on opposite sides of the device housing. For example, the ventilation housings are arranged directly on the device housing and / or attached directly to the device housing. However, it can also be provided that at least one of the ventilation housings, preferably both ventilation housings, are arranged at a distance from the device housing and are fluidically connected to the device housing or the fan and the heat exchanger. In any case, the first ventilation housing is located on the side of the roof structure facing the outside environment, and the second ventilation housing is located on the side of the roof structure facing the interior.

[0018] A known design of the ventilation unit extends through the roof skin, so that the first ventilation housing is arranged in the outside environment and, accordingly, the first ventilation opening is arranged on the side of the roof skin facing away from the roof structure. This makes it possible to draw fresh air directly from the outside environment and, conversely, to discharge exhaust air directly into the outside environment. However, with such a design, the operation of the ventilation unit is always dependent on the ambient conditions. For example, during heavy rainfall and / or low ambient temperatures, operation of the ventilation unit may be restricted, in particular to prevent moisture from the outside environment from entering the ventilation unit and / or excessive condensate from accumulating in the ventilation unit due to the fresh air temperature being too low.

[0019] For this reason, the first ventilation opening is intended to be located beneath the roof skin, i.e., on the side of the roof skin facing the roof structure. Preferably, the first ventilation opening is located between the roof structure and the roof skin, i.e., in the roof of the roof arrangement. Thus, fresh air is not drawn directly from the outside environment, nor is exhaust air fed to it, but rather is taken from a cavity between the roof structure and the roof skin or fed to the cavity, which is fluidically connected to the outside environment via openings in the roof skin. The openings include, for example, gaps between the roof covering elements.

[0020] Conveying fresh air from the cavity has the advantage that the fresh air is already pre-tempered by the roof. The exhaust air is also (further) tempered after exiting the ventilation unit into the cavity before passing from the cavity into the outside environment. This means, on the one hand, that the roof structure and roof membrane are used, at least in some areas, as an additional regenerator or heat storage facility, thus further increasing the efficiency of the ventilation unit. This is especially true if the roof membrane is made of the same or at least a similar material as the heat exchanger, for example, ceramic. Furthermore, the effective flow cross-sectional area between the outside environment and the ventilation unit is comparatively large.For this purpose, a total flow cross-sectional area between the outside environment and the cavity is preferably larger than a flow cross-sectional area of ​​the first ventilation opening, so that even under adverse ambient conditions, for example very low ambient temperatures, there is no risk of the first ventilation opening freezing over.

[0021] To arrange the first ventilation opening on the side of the roof skin facing the roof structure or between the roof structure and the roof skin, the first ventilation housing has a corresponding overall height, which is preferably a maximum of 6 cm, a maximum of 4 cm, or a maximum of 2 cm. In any case, the first ventilation housing is dimensioned such that it can be arranged between the roof structure and the roof skin. For example, the first ventilation housing is dimensioned such that it rests against the roof structure on the one hand, but is spaced from the roof skin on the other. Of course, it can also be provided that the first ventilation housing rests against both the roof structure and the roof skin, in particular on opposite sides. This achieves the advantages already mentioned.

[0022] A further development of the invention provides that the first ventilation opening is arranged between the roof covering and a roof insulation supported by the roof structure, in particular between the roof covering and an underlayment present on a side of the roof insulation facing the roof covering. The aforementioned roof insulation is supported by the roof structure and is present, for example, as over-rafter insulation, between-rafter insulation or under-rafter insulation or any combination of these insulations. For example, the cavity is delimited on the one hand by the roof covering and on the other hand, at least in regions, by the roof insulation, in particular if the roof insulation projects beyond the roof structure in the direction of the roof covering. It can also be provided that the cavity is delimited on the one hand by the roof covering and on the other hand, in regions, by the roof structure, in particular the rafters, and / or the roof insulation.

[0023] The first opening now opens into the cavity between the roof covering and the roof insulation. The roof insulation is particularly preferably protected by means of the underlayment, which for this purpose is arranged between the roof covering and the roof insulation. Preferably, the underlayment rests on the roof insulation or is arranged closer to the roof insulation than to the roof covering, so that the cavity is formed between the roof covering and the underlayment. The underlayment serves as a vapor retarder or vapor barrier and thus prevents moisture from the outside from penetrating the roof insulation. Provision can be made for the underlayment to be clamped between the at least one rafter and the at least one batten of the roof.The ventilation unit, or at least the first ventilation housing of the ventilation unit, penetrates the underlay from the interior to the exterior, creating the first ventilation opening between the underlay and the roof membrane. This ensures effective protection of the roof insulation.

[0024] A further development of the invention provides that the device housing is arranged in a recess in the roof insulation. It has already been mentioned above that the ventilation device can reach through the roof insulation. Specifically, this is provided for the device housing, wherein the roof insulation has the recess to accommodate the device housing. Preferably, the device housing does not protrude beyond the roof insulation in the direction of the roof skin, for example, the device housing is flush with the roof insulation. For example, the underlayment assigned to the roof insulation is sealingly attached to the ventilation device, for example by being clamped between the device housing and the first ventilation housing. The device housing therefore rests on a first side of the underlayment and the first ventilation housing rests on a second side opposite the first side.The arrangement of the device housing in the roof insulation ensures high efficiency. The recess is preferably designed such that the roof insulation rests against the device housing, particularly continuously when viewed in cross-section. The internal dimensions of the recess thus correspond, at least essentially, to the external dimensions of the device housing when viewed in cross-section.

[0025] A further development of the invention provides that the first ventilation housing is completely closed apart from the first ventilation opening and the device housing, and that the first ventilation opening is located on a lower side of the first ventilation housing corresponding to the roof pitch. The first ventilation opening is arranged and oriented in such a way that, due to the influence of gravity, water flowing downwards in the direction of the roof pitch is deflected by the first ventilation housing, in particular, is guided around the first ventilation opening. This effectively prevents water from entering the ventilation device from the cavity.

[0026] A further development of the invention provides that the first ventilation housing engages between two roof battens of the roof arrangement and / or is arranged between a batten plane comprising the roof battens and the roof insulation. The roof battens are arranged on rafters of the roof arrangement, namely on a side of the rafters facing the roof covering. Preferably, the roof covering is fastened to the rafters via the roof battens; in particular, the roof battens carry the roof covering or support it. The first ventilation housing extends from the interior of the building into between the roof battens, so that it penetrates the batten plane present between the roof battens, namely in the direction of the roof covering. The batten plane is defined by the roof battens; in particular, the batten plane intersects both roof battens in the middle.It can also be provided that the batten level nestles against the roof battens on one side facing the interior.

[0027] In addition to or alternatively to the first ventilation housing being positioned between the roof battens, the first ventilation housing is located between the battens and the roof insulation. This means that the first ventilation housing extends into the cavity defined by the roof insulation on the one hand and the battens on the other. The first ventilation housing can only partially extend through the cavity toward the battens, keeping it at a distance from the battens. However, it can extend completely through the cavity toward the roof skin, allowing it to be located both within the cavity and extending between the roof battens. The specific location of the first ventilation housing depends in particular on its dimensions and the design of the roof.

[0028] A further development of the invention provides that the first ventilation housing projects beyond the device housing in the radial direction relative to a longitudinal center axis of the device housing and rests against the roof insulation. In other words, the dimensions of the first ventilation housing in the radial direction are larger than the dimensions of the device housing in the same direction. Thus, while the device housing is arranged, for example, in the recess of the roof insulation, the first ventilation housing overlaps the recess, preferably completely, in particular, it completely closes the recess. This achieves a good insulating effect of the roof arrangement.

[0029] A further development of the invention provides that the first ventilation housing or a further first ventilation housing fluidically connected to the device housing via the first ventilation housing has a further first ventilation opening arranged on a side of the roof skin facing away from the roof structure. While the first ventilation opening is arranged in the cavity between the roof structure or the insulation on the one hand and the roof skin on the other, the further first ventilation opening is positioned outside, i.e. directly in the outside environment. Fresh air from the outside environment can be conveyed directly towards the interior via the further first ventilation opening and / or exhaust air from the ventilation device can be directly discharged to the outside environment.

[0030] The additional first ventilation opening can either be located on or in the first ventilation housing, like the first ventilation opening, which penetrates the roof membrane for this purpose, or it can be located on or in the additional first ventilation housing, which is fluidically connected to the device housing via the first ventilation housing. The two first ventilation openings, i.e., the first ventilation opening and the additional first ventilation opening, allow the ventilation device to be operated as needed, with the connection to the outside environment sometimes being only indirectly via the cavity and sometimes directly.

[0031] A further development of the invention provides that a surface normal of the further first ventilation opening is angled with respect to a plane that completely accommodates a surface normal of the first ventilation opening. The surface normal is to be understood as an imaginary straight line that is perpendicular to the respective ventilation opening or perpendicular to an imaginary plane that completely accommodates the ventilation opening. It can be provided that the surface normals of the first ventilation opening and the further first ventilation opening are arranged parallel or initially essentially parallel to one another. Preferably, however, the surface normal of the further first ventilation opening is angled with respect to the imaginary plane that completely accommodates the surface normal of the first ventilation opening.This means that the angle between the surface normal of the additional first ventilation opening and the imaginary plane is greater than 0° and less than 180°, in particular at least 45° and at most 135°, at least 60° and at most 120°, at least 80° and at most 100°, or approximately or exactly 90°. Thus, it can be provided to supply fresh air from different directions via the first ventilation openings or to discharge exhaust air in different directions.

[0032] A further development of the invention provides that the device housing is fluidically connected to the first ventilation opening and the further first ventilation opening via a valve device, by means of which a respective flow connection between the device housing and each of the first ventilation opening and the further first ventilation opening can be adjusted. For example, there is one flow connection between the device housing and the first ventilation opening, and another flow connection between the device housing and the further first ventilation opening.

[0033] Each of the flow connections can be established or interrupted by means of the valve device. In a first setting of the valve device for the first flow connection, this connection is interrupted, and in a second setting, it is at least partially or even completely established. Similarly, the second flow connection is completely interrupted in a first setting of the valve device and at least partially or completely established in a second setting.

[0034] More generally, different settings of the valve device result in different flow cross-sections of the first flow connection and / or different flow cross-sections of the second flow connection. For example, with a first setting of the valve device, the first flow connection is established and the second flow connection is interrupted, and with a second setting, the first flow connection is interrupted and the second flow connection is established. This ensures demand-based operation of the ventilation unit.

[0035] A further development of the invention provides that the valve device is connected to a control unit that adjusts the valve device depending on at least one setting and / or a sensor signal. The control unit is provided and configured to adjust the valve device. For example, the control unit adjusts the valve device, in particular a setting of the valve device, depending on the setting of the control unit. The setting is thus supplied to the control unit as an input variable, whereupon the control unit determines the setting to be adjusted on the valve device depending on this setting and adjusts it on the valve device.

[0036] Additionally or alternatively, the setting for the valve device is determined by the control unit based on the sensor signal. The sensor signal is provided by a sensor, which is preferably connected to the control unit. In this case, both the valve device and the sensor are connected to the control unit. The sensor is, for example, a temperature sensor, a humidity sensor, or the like. In any case, the described design of the roof arrangement ensures flexible operation of the ventilation unit.

[0037] A further development of the invention provides that the heat exchanger protrudes beyond the roof insulation at least in part in the direction of the roof skin, in particular is arranged completely between the roof skin and the roof insulation. The heat exchanger arranged in the device housing is therefore not arranged in the roof insulation or is only partially arranged therein, but protrudes beyond it in the direction of the roof skin. This makes it easier to discharge condensate accumulating in the area of ​​the heat exchanger from the ventilation unit towards the outside environment by means of gravity, preferably by means of gravity alone. The condensate is particularly preferably discharged onto the underlayment and flows downwards via this in the direction of the roof pitch. For this purpose, the heat exchanger is particularly preferably arranged above the roof insulation, i.e. between the roof skin and the roof insulation. This enables particularly efficient discharge of the condensate, in particular onto the underlayment.

[0038] A further development of the invention provides that, viewed in the axial direction relative to the longitudinal center axis of the device housing, between the second ventilation housing and the heat exchanger, a condensate drain opens into the device housing, in particular running with a continuous gradient through the roof insulation to the side of the roof insulation facing the roof skin. The condensate drain serves to remove the condensate from the device housing. The condensate usually accumulates on the side of the heat exchanger facing the interior or is forced through the heat exchanger in this direction by gravity. Accordingly, the condensate drain is located below the heat exchanger or opens into the device housing there.

[0039] The condensate is drained through the condensate drain by gravity and thus transported out of the unit housing. The condensate drain is designed as a condensate pipe and extends through the roof insulation with a continuous gradient until it exits the roof insulation and ends above the roof underlay. The gradient of the condensate drain is consistently selected so that the condensate is reliably drained away from the ventilation unit by gravity. For example, the gradient of the condensate drain is consistently at least 2%, at least 4%, or at least 8%. The described design of the ventilation unit and roof arrangement enables efficient condensate drainage.

[0040] A further development of the invention provides that the device housing is fluidically connected to the first ventilation housing and / or to the second ventilation housing and / or the further first ventilation housing via a flexible pipe. At least one of the ventilation housings is not directly adjacent to the device housing, but is arranged at a distance from it. For example, this applies to exactly one of the ventilation housings or several or even all of the ventilation housings. In this case, the respective ventilation housing is fluidly connected to the device housing via a flexible pipe. Such a flexible pipe is therefore arranged between each of the ventilation housings arranged at a distance from the device housing and the device housing. The flexible pipe is in the form of a corrugated pipe, for example, and is preferably made of metal, in particular of a rust-proof metal.However, a corrugated plastic pipe can also be used. In any case, connecting the respective ventilation housing to the unit housing via the flexible pipe allows for free positioning of the ventilation housing after the unit housing has been secured. This is particularly advantageous when retrofitting the ventilation unit in an existing building.

[0041] A further development of the invention provides that an inner diameter of the flexible duct at least corresponds to an inner diameter of the device housing, so that the fan and / or the heat exchanger can be removed from the device housing through the duct. The fan or the heat exchanger is reversibly fastened in the device housing without damage. For example, a positive fastening is provided, in particular a snap-in connection. For maintenance purposes or for replacement, the fan or the heat exchanger can be removed from the device housing by loosening the fastening and subsequently moving the fan or the heat exchanger out of the device housing.

[0042] If one of the ventilation housings is fluidically connected to the unit housing via the flexible duct, it must be ensured that the fan or heat exchanger can also be removed through the flexible duct, especially towards the interior. For this reason, the inner diameter of the flexible duct is at least as large as the inner diameter of the unit housing or at least larger than the outer diameter of the fan or heat exchanger, for example, by a factor of at least 1.1, at least 1.2, or at least 1.4. This ensures easy replacement of the aforementioned component and simple maintenance of the ventilation unit.

[0043] A further development of the invention provides that the first ventilation housing and / or the second ventilation housing are arranged off-center with respect to the longitudinal center axis of the device housing. This means, in particular, that a longitudinal center axis of the first ventilation housing or the second ventilation housing is spaced parallel to the longitudinal center axis of the device housing or is angled or skewed relative to it. In any case, the longitudinal center axis of the respective ventilation housing does not coincide with the longitudinal center axis of the device housing. This ensures a flexible arrangement of the ventilation device.

[0044] The invention naturally also relates to a building with a roof arrangement according to the embodiments in the context of this description.

[0045] The features and feature combinations described in the description, in particular the features and feature combinations described in the following description of the figures and / or shown in the figures, can be used not only in the respective combination specified, but also in other combinations or on their own, without departing from the scope of the invention. Thus, embodiments are also considered to be encompassed by the invention that are not explicitly shown or explained in the description and / or the figures, but which follow from or can be derived from the explained embodiments.

[0046] The invention will be explained in more detail below with reference to the exemplary embodiments shown in the drawings, without limiting the invention. In the drawings: Fig. 1 a schematic representation of a roof arrangement in a first embodiment, and Fig. 2 a schematic representation of the roof arrangement in a second embodiment.

[0047] The Fig. 1 shows a schematic representation of a roof arrangement 1 in a first embodiment. The roof arrangement 1 comprises a roof 2 and a ventilation unit 3. The roof 2 in turn has a roof structure 4, of which roof battens 5 are shown here, and a roof covering 6, which is composed of several roof tiles 7. The roof tiles 7 are supported on the roof battens 5 or are suspended from them. The roof tiles 7 are held to the roof battens 5, among other things, by the force of gravity acting on them. Not shown here are the rafters of the roof structure 4, to which the roof battens 5 are attached. Roof insulation 8 in the form of between-rafter insulation is arranged between the rafters. The roof insulation 8 is delimited in the direction of the roof covering 6 by an underlayment 9.

[0048] The roof 2 separates an interior 10 of a building, of which the roof arrangement 1 preferably forms a part, from an exterior environment 11. To ventilate the interior 10, the roof arrangement 1 has the ventilation unit 3. This serves, for example, to ventilate the interior 10 with fresh air from the exterior environment 11, which is supplied to the interior 10 in the form of supply air. Alternatively or additionally, the ventilation unit 3 serves to ventilate the interior 10, with exhaust air being taken from the interior 10 and supplied to the exterior environment 11 in the form of exhaust air.

[0049] The ventilation unit 3 has a unit housing 12 in which a fan 13 and a heat exchanger 14 are arranged. A first ventilation housing 15 is located on one side of the unit housing 12, and a second ventilation housing 16 is located on the other side of the unit housing 12. In the illustrated embodiment, the ventilation housings 15 and 16 are directly adjacent to the unit housing 12, in particular they are fastened to it. A first ventilation opening 17 is provided in the first ventilation housing 15, in particular only a single first ventilation opening 17. This means that the first ventilation opening 17 is the only opening in the first ventilation housing 15, apart from a fluidic connection between the first ventilation housing 15 and the unit housing 12. A second ventilation opening 18 is provided in the second ventilation housing 16.For example, it extends at least partially around the second ventilation housing 16 in the circumferential direction relative to a longitudinal center axis of the device housing 12, so that it is present on opposite sides of the second ventilation housing 16. Particularly preferably, the second ventilation opening 18 completely and continuously encompasses the longitudinal center axis.

[0050] It can be seen that the first ventilation opening 17 is arranged on a side of the roof skin 6 facing the roof structure 4, i.e. in a cavity 19 which is bounded inwards by the roof structure 4 and / or the roof insulation 8 and outwards by the roof skin 6. The cavity 19 is fluidically connected to the outside environment 11 via gaps 20 between the roof tiles 7, so that a flow connection is established between the outside environment 11 and the ventilation unit 3 via the cavity 19 and the gaps 20. This arrangement of the first ventilation opening 17 ensures that the ventilation unit 3 can be operated largely unaffected by ambient conditions in the outside environment 11.

[0051] In the Fig.2, a second embodiment of the roof arrangement 1 is shown schematically. This is fundamentally similar to the first embodiment, so that reference is made to the corresponding embodiments and only the differences are discussed below. These lie in the fact that the ventilation device 3 not only has the first ventilation opening 17, but also a further first ventilation opening 21, which is produced in a further first ventilation housing 22. The first ventilation housings 15 and 22 are designed such that the first ventilation opening 17, as already explained, is arranged in the cavity 19, while the further first ventilation opening 21 is on the side of the roof skin 6 facing the outside environment 11. In order to protect the ventilation device 3 from environmental influences, the further first ventilation opening 21 is covered by a hood 23. The further first ventilation housing 22 is fluidically connected to the device housing 12 via the first ventilation housing 15.To achieve greater flexibility during the installation of the ventilation unit 3, the first ventilation housing 22 is connected to the first ventilation housing 15 via a flexible pipe 24. Additionally or alternatively, the second ventilation housing 16 is connected to the device housing 12 via a flexible pipe 25. The flexible pipes 24 and 25 enable subsequent positioning of the ventilation housings 15, 22 and 16, respectively, after the device housing 12 has already been installed. LIST OF REFERENCE SYMBOLS 1 roof arrangement 2 roof 3 Ventilation unit 4 Roof construction 5 roof battens 6 Roof skin 7 roof tiles 8 Roof insulation 9 Underlayment 10 Interior 11 Outdoor environment 12 device housings 13 Fan 14 heat exchangers 15 1. Ventilation housing 16 2. Ventilation housing 17 1. Ventilation opening 18 2. Ventilation opening 19 Cavity 20 space 21 additional 1st ventilation opening 22 additional 1st ventilation housing 23 hood 24 pipeline 25 pipeline

Claims

[1] Roof arrangement (1) for a building, comprising a roof structure (4), a roof skin (6) supported by the roof structure (4), and a ventilation device (3), wherein the ventilation device (3) has a first ventilation opening (17) on the outside environment side and a second ventilation opening (18) on the inside space side, which are fluidically connected to one another via a fan (13) and a heat exchanger (14), wherein the fan (13) and the heat exchanger (14) are present in a device housing (12) arranged at least in part in the roof structure (4), and the first ventilation opening (17) is arranged in a first ventilation housing (15) arranged on one side of the device housing (12), and the second ventilation opening (18) is arranged in a second ventilation housing (16) arranged on the other side of the device housing (12), characterized bythat the first ventilation housing (15) has the first ventilation opening (17) on a side of the roof skin (6) facing the roof structure (4). [2] Roof arrangement (1) according to claim 1, characterized by that the first ventilation opening (17) is arranged between the roof skin (6) and a roof insulation (8) carried by the roof structure (4). [3] Roof arrangement (1) according to one of the preceding claims, characterized by that the device housing (12) is arranged in a recess in the roof insulation (8). [4] Roof arrangement (1) according to one of the preceding claims, characterized by that the first ventilation housing (15) is completely closed apart from the first ventilation opening (17) and the device housing (12) and the first ventilation opening (17) is located on a side of the first ventilation housing (15) which is located at the bottom, corresponding to a roof pitch. [5] Roof arrangement (1) according to one of the preceding claims, characterized bythat the first ventilation housing (15) engages between two roof battens (5) of the roof arrangement (1) and / or is arranged between a batten plane having the roof battens (5) and the roof insulation (8). [6] Roof arrangement (1) according to one of the preceding claims, characterized by that the first ventilation housing (15) projects beyond the device housing (12) in the radial direction with respect to a longitudinal center axis of the device housing (12) and is supported on the roof insulation (8). [7] Roof arrangement (1) according to one of the preceding claims, characterized by that the first ventilation housing (15) or a further first ventilation housing (22) fluidically connected to the device housing (12) via the first ventilation housing (15) has a further first ventilation opening (21) which is arranged on a side of the roof skin (6) facing away from the roof structure (4). [8] Roof arrangement (1) according to one of the preceding claims, characterized bythat a surface normal of the further first ventilation opening (21) is angled relative to a plane completely accommodating a surface normal of the first ventilation opening (17). [9] Roof arrangement (1) according to one of the preceding claims, characterized by in that the device housing (12) is fluidically connected to the first ventilation opening (17) and the further first ventilation opening (21) via a valve device, by means of which a respective flow connection between the device housing (12) and each of the first ventilation opening (17) and the further first ventilation opening (21) can be adjusted. [10] Roof arrangement (1) according to claim 9, characterized by that the valve device is connected to a control unit which adjusts the valve device in dependence on at least one setting and / or a sensor signal. [11] Roof arrangement (1) according to one of claims 2 to 10, characterized bythat the heat exchanger (14) projects beyond the roof insulation (8) at least in part in the direction of the roof skin (6). [12] Roof arrangement (1) according to one of the preceding claims, characterized by that in the axial direction with respect to the longitudinal center axis of the device housing (12) a condensate drain opens into the device housing (12) between the second ventilation housing (16) and the heat exchanger (14). [13] Roof arrangement (1) according to one of claims 7 to 12, characterized by that the device housing (12) is fluidically connected to the first ventilation housing (15) and / or to the second ventilation housing (16) and / or the further first ventilation housing (22) via a flexible pipe (24, 25). [14] Roof arrangement (1) according to claim 13, characterized bythat an inner diameter of the flexible pipe (24, 25) at least corresponds to an inner diameter of the device housing (12), so that the fan (13) and / or the heat exchanger (14) can be removed from the device housing (12) through the flexible pipe (24, 25). [15] Roof arrangement (1) according to one of the preceding claims, characterized by that the first ventilation housing (15) and / or the second ventilation housing (16) are arranged off-center with respect to the longitudinal center axis of the device housing (12).

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