FIRE EXTINGUISHING SYSTEM FOR A ROOF WITH A SOLAR INSTALLATION

Abstract

The invention concerns a fire extinguishing system for a roof with a solar installation, wherein the fire extinguishing system comprises an extinguishing apparatus with a plurality of groups of extinguishing agent outlets (8, 108) for discharging an extinguishing agent on the roof. Each group of extinguishing agent outlets (8, 108) is respectively assigned to a spatial extinguishing area (22, 23), wherein the extinguishing apparatus is configured such that extinguishing agent is dischargeable by means of extinguishing agent outlets (8) of a group independently of a discharging of the extinguishing agent by means of extinguishing agent outlets (108) of another group, and wherein at least two extinguishing areas (22, 23) overlap. The system furthermore comprises a detection apparatus (11) configured to detect, as a detection location, a location where a fire has occurred or is likely to occur.

Claims

1.-8. (canceled)

9. Fire extinguishing system for a roof with a solar installation, the fire extinguishing system comprising: an extinguishing apparatus with a group of extinguishing agent outlets for discharging an extinguishing agent on the roof, the extinguishing agent outlets comprising extinguishing nozzles that, pointing alternately in opposing direction, discharge extinguishing agent into a respective coverage region and comprise a horizontal discharge angle smaller than 360, wherein coverage regions of neighboring extinguishing nozzles of the group overlap, and a detection apparatus configured to detect, as a detection location, a location where a fire has occurred or is likely to occur.

10. Fire extinguishing system according to claim 9, wherein the detection apparatus comprises a plurality of detectors for detecting the location where a fire has occurred or is likely to occur, wherein the detectors are arranged along straight lines.

11. Fire extinguishing system according to claim 10, wherein the detectors are arranged along straight lines that extend in a guiding direction.

12. Fire extinguishing system according to claim 9, wherein the extinguishing apparatus is configured to use extinguishing foam as extinguishing agent, wherein the extinguishing apparatus comprises a pipe system, a water valve and a foam generator for generating extinguishing foam, the pipe system being configured to guide water from the water valve to the foam generator and extinguishing foam from the foam generator to the extinguishing agent outlets.

13. Fire extinguishing system according to claim 12, wherein the extinguishing agent outlets are configured such that they also contribute to the generating of foam.

14. Fire extinguishing system according to claim 9, wherein the extinguishing apparatus comprises a plurality of groups of extinguishing agent outlets for discharging an extinguishing agent on the roof, the extinguishing apparatus being configured such that a) the extinguishing agent is dischargeable by extinguishing agent outlets of one group independently of a discharging of the extinguishing agent of extinguishing agent outlets of another group and b) the extinguishing agent is dischargeable by extinguishing agent outlets of the other group in dependence on a discharging of the extinguishing agent by extinguishing agent outlets of the one group.

15. Fire extinguishing system according to claim 9, wherein the extinguishing apparatus comprises a plurality of groups of extinguishing agent outlets for discharging an extinguishing agent on the roof, the extinguishing apparatus being configured such that a) the extinguishing agent is dischargeable by extinguishing agent outlets of one group independently of a discharging of the extinguishing agent by extinguishing agent outlets of another group and b) the extinguishing agent is dischargeable by extinguishing agent outlets of the other group independently of a discharging of the extinguishing agent by extinguishing agent outlets of the one group.

16. Fire extinguishing system according to claim 9, wherein the extinguishing apparatus comprises a plurality of groups of extinguishing agent outlets for discharging an extinguishing agent on the roof and is configured such that each extinguishing agent outlet discharges the extinguishing agent into a respective coverage region, wherein an overlap region of coverage regions of two neighboring extinguishing agent outlets of a same group is smaller than an overlap region of coverage regions of neighboring extinguishing agent outlets of different groups.

17. Solar installation system for a roof, the solar installation system comprising: a fire extinguishing system according to claim 9, and at least one solar panel.

18. Solar installation system according to claim 17, wherein the detection apparatus comprises a plurality of detectors for detecting the detection location, the detectors being installed on the solar panel in such a manner that the detectors are, after installation on the roof, arranged below the solar panel.

19. Solar installation system according to claim 18, wherein the solar panel is arranged inclined in such a manner on the roof that it comprises an upper side and an opposing lower side, wherein the detectors are arranged below the solar panel in a region of the upper side.

20. Solar installation system according to claim 17, wherein the extinguishing apparatus is configured such that, after installation of the solar installation system on the roof, the extinguishing agent outlets are arranged below the solar panel in such a manner that the extinguishing agent is dischargeable into a region below the solar panel.

21. Solar installation system according to claim 17, wherein the solar installation system comprises a plurality of solar panels (10) arranged next to each other in a guiding direction.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Subsequently, embodiments of the invention are described by reference to the following figures, wherein

[0057] FIG. 1 illustrates schematically and exemplarily components of a solar installation system for a roof with a fire extinguishing system and a plurality of solar panels in a first view,

[0058] FIG. 2 shows a second schematic and exemplary view of the components illustrated in FIG. 1,

[0059] FIG. 3 shows a third schematic and exemplary view of the components illustrated in FIG. 1,

[0060] FIG. 4 illustrates schematically and exemplarily further components of a solar installation system with a fire extinguishing system,

[0061] FIG. 5 depicts schematically and exemplarily overlapping extinguishing areas of a fire extinguishing system,

[0062] FIG. 6 depicts schematically and exemplarily a boundary region between adjacent extinguishing areas,

[0063] FIG. 7 shows schematically and exemplarily a specific arrangement of solar panels on a roof,

[0064] FIG. 8 illustrates schematically and exemplarily components of an embodiment of a fire extinguishing system for a roof with a solar installation and

[0065] FIG. 9 illustrates schematically and exemplarily components of a further embodiment of a fire extinguishing system for a roof with a solar installation.

DETAILED DESCRIPTION OF THE INVENTION

[0066] FIG. 1 illustrates schematically and exemplarily components of a solar installation system on a roof 1, wherein the solar installation system comprises a plurality of solar panels 10 and a fire extinguishing system. The solar panels 10 are in this embodiment arranged in two rows 3, 4 and mounted on a plate 2 that, in turn, is fixed on the roof 1. The fire extinguishing system comprises an extinguishing apparatus of which, in FIG. 1, horizontally extending pipes 5 for supplying extinguishing agent to the roof 1 and vertically extending pipes 6 are shown at whose ends extinguishing agent outlets with extinguishing agent nozzles are arranged. The extinguishing agent is hence guided via the horizontally extending pipes 5 and then via the vertically extending pipes 6 to the extinguishing agent outlets with the extinguishing nozzles, wherein the extinguishing agent outlets at the ends of the vertical pipes 6 are, in this illustration, arranged in two lines extending in a so-called guiding direction 21. The solar panels 10 and the horizontal pipes 5 are held by means of support struts 7.

[0067] The roof 1 is a flat roof, i.e. a roof having a roof inclination of less than 10.

[0068] FIG. 2 shows schematically and exemplarily a top view onto the components shown in FIG. 1. In particular, FIG. 2 shows the extinguishing agent outlets 8 arranged in two lines together with their respective coverage regions 9. In this example, each extinguishing agent outlet 8 comprises an extinguishing nozzle having a horizontal discharge angle of 180, wherein neighboring extinguishing agent outlets 8 along a pipe comprise extinguishing nozzles that discharge, as viewed from above in opposing directions. These directions, being projected into an imagined horizontal plane, are perpendicular to the course of the horizontal pipes 5 and hence perpendicular to the guiding direction 21.

[0069] FIG. 3 shows schematically and exemplarily a lateral view of the components shown in FIGS. 1 and 2. As shown in FIG. 3, the solar panels 10 are preferentially arranged inclined on the plate 2 by means of the support struts 7, wherein the respective solar panel 10 comprises, due to the inclined position, an upper side 44 and an opposing lower side 43. The pipe system is installed such that the extinguishing agent outlets 8 with the extinguishing nozzles are arranged below the solar panels 10 in such a way that the extinguishing agent is dischargeable into a region below the respective solar panel 10. The extinguishing nozzles hence spray the extinguishing agent into the region below the respective solar panel 10. In this example, the distance between the extinguishing agent outlets 8 and the plate 2 is two thirds of the distance between the upper side 44 of the solar panel 10 and the plate 2. In particular, the distance of the extinguishing agent outlets 8 to the plate 2 is two thirds of the distance between a lower edge of the upper side 44 of the solar panel 10 and the plate 2. If, in another embodiment, the solar installation is installed directly on the roof 1, without using the plate 2, the distance between the extinguishing agent outlets 8 and the roof 1 is particularly two thirds of the distance between the upper side 44 of the solar panel 10, particularly the lower edge of the upper side 44 of the solar panel 10, and the roof 1.

[0070] In this embodiment, the distance x between opposing solar panels 10 of neighboring rows is at most 80 cm and the distance z between the lower edge of the upper side 44 of the respective solar panel 10 and the plate 2 is at most 80 cm. These dimensions are to be regarded as being merely exemplary. In other embodiments, these maximum values can also be exceeded.

[0071] The fire extinguishing system also comprises a detection apparatus 11 configured to detect, as a detection location, a location where a fire has occurred or is likely to occur. The detection apparatus 11 comprises a plurality of detectors 12 for detecting the detection location, wherein the detection apparatus 11 with the detectors 12 is installed on the respective solar panel 10 such that the detection apparatus 11 with the detectors 12, after installation on the roof 1, is arranged below the respective solar panel 10. In this embodiment, the detection apparatus 11 with the detectors 12 is arranged below the solar panel 10 in the region of the respective upper side 44. By this arrangement of the detection apparatus 11 with the detectors 12 below the solar panels 10, the detection apparatus is protected from overly strong insolation, as a result of which the lifetime of the detectors can be increased and the likelihood of an erroneous fire detection caused by the insolation can be reduced.

[0072] FIGS. 1 to 3 illustrate, as already mentioned above, only a few components of the entire solar installation system with the fire extinguishing system and the solar panels. In this embodiment, the entire solar installation system actually comprises six rows of solar panels 10, wherein the fire extinguishing system comprises two extinguishing areas with six horizontal pipes 5, 105 each, wherein one of these extinguishing areas is depicted exemplarily and schematically in FIG. 4. In FIGS. 1 to 3, only few components were illustrated for the purpose of a clearer presentation.

[0073] The fire extinguishing system hence comprises an extinguishing apparatus with two groups of extinguishing agent outlets for discharging an extinguishing agent on the roof 1, wherein a first group of extinguishing agent outlets 8, together with further elements of the extinguishing apparatus and the fire extinguishing system, is shown in FIG. 4.

[0074] The fire extinguishing system comprises a controller 15 configured to control the extinguishing apparatus in dependence on the detection location. It is also depicted schematically in FIG. 4 that the detectors 12 of the detection apparatus 11 are respectively arranged along straight lines extending in the guiding direction 21. The detectors 12 of the detection apparatus 11 hence extend parallel to the horizontal pipes 5 and thus to the extinguishing agent outlets 8. In this embodiment, the detection apparatus 11 with the detectors 12 is a line-shaped resettable heat detector. The detectors 12 are hence preferentially heat detectors, wherein a fire or a likely occurrence of a fire at a detector location and thus a detection location can be determined on the basis of a heat measurement. For instance, a detection location can be detected if the measured heat and/or a measured heat gradient at this location has exceeded a predetermined threshold value. Preferentially, the respective detector 12 measures the heat on the basis of a temperature measurement, such that a detection location can be detected if the measured temperature and/or a temperature gradient at this location exceeds a predetermined threshold value. Also other detector types can be used, such as smoke detectors, for instance.

[0075] In this embodiment, the extinguishing apparatus is configured to use extinguishing foam as extinguishing agent. Extinguishing foam has, inter alia, the advantage that less or none of it enters the roof 1, by which extinguishing damages can be reduced. In another embodiment, however, also another extinguishing agent can be used, such as water, for instance. In this embodiment, low-expansion foam with the expansion ratio 6 is used as extinguishing agent. However, also other low-expansion and also medium-expansion foams can be used. For instance, a low-expansion foam with another expansion ratio between and including 4 and 20 or a medium-expansion foam with an expansion ratio between and including 21 and 200 can be used. Low-expansion and medium-expansion foams are preferred in comparison to high-expansion foams because they can be blown away by wind less easily.

[0076] The extinguishing apparatus of the fire extinguishing system comprises a deluge valve 17 with a magnetic valve 19 as trigger mechanism and a foam generator 20 that is connected to the deluge valve 17 via a pipe 14. The foam generator 20 is, in turn, connected to the pipe 5 via a pipe 13. The controller 15 is connected to the trigger mechanism 19 by means of a wiring 18 and to the line-shaped heat detector 11 by means of a further wiring 16, such that the controller 15 can control the trigger mechanism 19 in dependence on a detected fire.

[0077] As foam generator 20, for instance, a foam generator known under the product name Viking foam generator can be used. The foaming agent can, for instance, be a synthetic surfactant foaming agent or a protein foaming agent. However, also other foaming generators and/or other foaming agents can be used.

[0078] The extinguishing agent outlets 8 can be configured such that they also contribute to the generating of foam. The extinguishing foam can hence be generated in two stages, wherein, in a first stage, extinguishing foam is generated in the pipe system by means of the foam generator 20 and, in a second stage, the extinguishing foam is further generated by means of extinguishing nozzles. The extinguishing nozzles can contribute to the generating of foam without external energy. Preferentially, in the first stage, a minimum foaming is generated that is dimensioned such that, based on the minimum foaming alone, the extinguishing foam can hardly enter a building through the roof 1. The foaming requirement can then be relatively low for the extinguishing nozzles. However, it is also possible that the extinguishing foam is generated, for instance, in a single stage by the foam generator 20.

[0079] FIG. 4 shows, as described above, one of the two extinguishing areas of the extinguishing apparatus of the fire extinguishing system. The combination of both extinguishing areas is schematically and exemplarily depicted in FIG. 5.

[0080] As shown in this figure, the extinguishing apparatus comprises two groups of extinguishing agent outlets 8, 108 for discharging the extinguishing agent on the roof 1, wherein each group of extinguishing agent outlets 8, 108 is respectively assigned to a spatial extinguishing area 22, 23. The extinguishing apparatus is configured such that the extinguishing agent is dischargeable by means of extinguishing agent outlets 8 of the first group independently of a discharging of the extinguishing agent by means of the extinguishing agent outlets 108 of the second group, wherein the two extinguishing areas 22, 23 overlap in an overlap region 40.

[0081] The second extinguishing area is configured similar as the first extinguishing area which has been described above by reference to FIGS. 1 to 4. In particular, also the second extinguishing area comprises horizontal pipes 105 and vertical pipes that lead to the extinguishing agent outlets 108. Also the generating of foam and the control for the second extinguishing area can be realized as described above by reference to FIG. 4. In particular, both of the groups of extinguishing agent outlets 8, 108 are addressable separately from each other, such that extinguishing can take place in the extinguishing areas 22, 23 independently from each other. It is therefore not necessary to always discharge an extinguishing agent onto the entire roof 1, by which an entry of extinguishing agent into the building can be reduced.

[0082] The extinguishing areas 22, 23 can be understood as group action areas 22, 23, wherein i) the first group action area or the first extinguishing area 22, respectively, is formed by the extinguishing agent outlets 8 and ii) the second group action area or the second extinguishing area 23, respectively, is formed by the extinguishing agent outlets 108. The extinguishing apparatus is configured such that the extinguishing agent is discharged simultaneously by means of extinguishing agent outlets of a same group. In this embodiment, the extinguishing areas or group action areas 22, 23, respectively, each extend over at least 50 m.sup.2.

[0083] As has been described above, a pipe system comprising the horizontal and vertical pipes 5, 6 is assigned to the first extinguishing area 22 for guiding the extinguishing agent to the extinguishing agent outlets 8, wherein, as also explained above, the pipe system of the first extinguishing area 22 is configured such that the extinguishing agent outlets 8 are arranged along straight lines extending in the guiding direction 21. The second extinguishing area 23 comprises a corresponding pipe system with horizontal and vertical pipes for guiding the extinguishing agent to the respective extinguishing agent outlets 108, wherein the pipe system of the second extinguishing area 23 is also configured such that its extinguishing agent outlets 108 are arranged along lines extending in the guiding direction 21, wherein the extinguishing areas 22, 23 overlap and form the overlap region 40 in this guiding direction 21. In this embodiment, the overlap region has, in the guiding direction 21, preferentially a length of at least 2 m and further preferred of at least 3 m.

[0084] The overlapping extinguishing areas 22, 23 are arranged next to each other in the guiding direction 21, wherein the extinguishing agent outlets 8, 108 of different groups that are assigned to the overlapping extinguishing areas 22, 23 are arranged along lines that are displaced with respect to each other perpendicularly to the guiding direction 21. A first set of lines of the first group of extinguishing agent outlets 8, which are assigned to the first extinguishing area 22, and a second set of lines of the second group of extinguishing agent outlets 108, which are assigned to the second extinguishing area 23 overlapping with the first extinguishing area 22, interlock. In this embodiment, among the extinguishing agent outlets 8 of the first group, those extinguishing agent outlets which are arranged furthest in the direction of the second group are arranged at the same position, with respect to the guiding direction 21, as those extinguishing agent outlets of the second group of extinguishing outlets 108 which are arranged furthest in the direction of the first group.

[0085] The controller 15 is preferentially configured to not only control the discharging of the extinguishing agent for the first extinguishing area 22, but also the discharging of the extinguishing agent for the second extinguishing area 23. In another embodiment, also a plurality of controllers can be present that carry out the corresponding controls of the extinguishing areas.

[0086] The controller 15 is configured to determine, on the basis of signals of the detection apparatus 11, in which of the extinguishing areas 22, 23 the detection location is located, and to control the extinguishing apparatus such that the extinguishing agent is discharged in the determined extinguishing area. If the detection location is located in the overlap region 40, in which the extinguishing areas 22, 23 overlap, then these overlapping extinguishing areas 22, 23 are determined and the extinguishing agent is discharged in both of these extinguishing areas 22, 23. It is also possible that one or more detection locations are determined in a non-overlapping part of an extinguishing area. In this case, the extinguishing agent is only discharged in this extinguishing area.

[0087] Due to the arrangement of the rows of solar panels in guiding direction 21, winds present on the roof are generally guided at least in part along this guiding direction 21. For this reason, a deviation of the detection location from the actual fire location particularly occurs in this guiding direction 21. To counteract this effect, the overlapping of the extinguishing areas 22, 23 takes place in the guiding direction 21.

[0088] The extinguishing apparatus is configured such that the extinguishing agent is discharged simultaneously through extinguishing agent outlets of a same group. Furthermore, the controller is preferentially configured to control the extinguishing apparatus such that the extinguishing agent is discharged simultaneously in both extinguishing areas 22, 23 if the detection location is located in the overlap region 40.

[0089] The detection apparatus 11 can be configured to detect a fire by means of radiant heat and/or by means of convective heat transfer. The detectors 12 of the detection apparatus 11 are arranged at different detection positions and respectively assigned to an extinguishing region 22, 23 and, in the overlap region 40, to both of the extinguishing areas 22, 23. In this embodiment, these assignments are known to the controller 15. The assignments can, for instance, be stored in the controller 15 or in a separate memory connected to the controller 15. Due to the assignments, the controller 15 can immediately recognize in which of the extinguishing areas 22, 23 a detection location has been detected and can immediately activate the extinguishing area or areas designated for extinguishing.

[0090] In this embodiment, the extinguishing nozzles of the extinguishing agent outlets 8, 108 comprise a horizontal discharge angle of 180. However, also extinguishing nozzles comprising a smaller or a larger horizontal discharge angle can be used. The extinguishing nozzles are, for instance, the extinguishing nozzles with the product designation Viking Model C-1 Window Sprinkler. The extinguishing nozzles can also be so-called aspirating sprinklers. Furthermore, in this embodiment, which has been described by reference to FIGS. 1 to 5, the distance between two neighboring extinguishing agent outlets 8, 108 of a same extinguishing group 22, 23 is at most 160 cm. In another embodiment, this distance can however also be larger.

[0091] The winds expected on the roof can, as explained above, have the effect that the detection location, i.e. the location where the fire has been detected, does not exactly coincide with the real fire location. The detection location being shifted in comparison to the actual fire location, in turn, could in principle have the effect that an extinguishing area is activated for extinguishing that covers the detection location, but not the real fire location, wherein this problem particularly occurs in boundary regions between extinguishing areas. To counteract this problem, in the embodiment described by reference to FIG. 4, the extinguishing areas 22, 23 overlap in the overlap region 40. However, it is also possible to counteract this problem if the extinguishing areas do not overlap. This is described in the following by reference to FIG. 6.

[0092] Also in this embodiment the fire extinguishing system for a roof with a solar installation comprises an extinguishing apparatus with two groups of extinguishing agent outlets 8, 108 for discharging an extinguishing agent on the roof 1, each group of extinguishing agent outlets 8, 108 being respectively assigned to a spatial extinguishing area 24, 25. The extinguishing apparatus is configured such that extinguishing agent is dischargeable by means of extinguishing agent outlets 8 of a group independently of a discharging of the extinguishing agent by means of extinguishing agent outlets 108 of another group. In this embodiment, the extinguishing areas 24, 25, which could also be understood as group action areas, do not overlap. Furthermore, also in this embodiment a detection apparatus 11 with detectors 12 is present that is configured to detect, as a detection location, a location where a fire has occurred or is likely to occur. Moreover, also in this embodiment the fire extinguishing system comprises a controller 15 configured to control the extinguishing apparatus in dependence on the detection location. In this embodiment, however, the controller 15 is configured such that, if the detection location is located in a predefined boundary region 41 that includes two adjacent subregions of different extinguishing areas 24, 25, the extinguishing agent is discharged in both extinguishing areas 24, 25 whose subregions are included by the boundary region 41. In other words, if the detection location is located in the first extinguishing area 24 and inside the boundary region 41 and if the real fire location is located in the adjacent second extinguishing area 25, nevertheless both extinguishing areas 24, 25 are activated, such that the shift of the detection location relative to the actual fire location caused by the wind does not lead to a sole activation of the wrong, first extinguishing area and hence to no extinguishment.

[0093] Apart from the non-existent overlap and the modified control, the fire extinguishing system described here by reference to FIG. 6 corresponds to the fire extinguishing system that has been described above by reference to FIG. 5. In particular, also in this embodiment a pipe system 5, 105 is assigned to each extinguishing area 24, 25 for guiding the extinguishing agent to the respective extinguishing agent outlets 8, 108, wherein the pipe system 5 of the first extinguishing area 24 is configured such that the extinguishing agent outlets 8 are arranged along lines extending in the guiding direction 21, and wherein the pipe system 105 of the other extinguishing area 25 is also configured such that the extinguishing agent outlets 108 are arranged along lines extending in the guiding direction 21. The boundary region 41 is defined in such a manner that it covers a boundary line 42 between the adjacent extinguishing areas 24, 25 that extends perpendicular to the guiding direction 21.

[0094] The ends of the pipes 5, 105 of different adjacent extinguishing areas 24, 25 oppose each other in such a manner that the respective adjoining, terminating extinguishing nozzles 8, 108 of different extinguishing areas 24, 25 point in different directions. Since the adjoining, terminating extinguishing nozzles 8, 108 of different adjacent extinguishing areas 24, 25 point in different directions, in the boundary region 41, a region directly above (top down view) a pipe section is supplied by an extinguishing nozzle 8 of the first extinguishing area 24, but directly below by the extinguishing nozzle 108 of the adjacent second extinguishing area 25, for instance. This is illustrated in FIG. 6 by the coverage regions 9, 109 of the extinguishing nozzles 8, 108 and the imagined extinguishing line 45. For this reason, the sides of the boundary region 41 arranged vertically in FIG. 6, i.e. the sides of the boundary region 41 that extend perpendicular to the pipes 5, 105 are formed as a rectangle curve.

[0095] Although in the described embodiments the extinguishing nozzles comprise a horizontal discharge angle of 180, the discharge angle can also be larger or smaller.

[0096] Although in the above-described embodiments the extinguishing nozzles alternately point in opposing directions, it is also possible in other embodiments that extinguishing nozzles that are arranged neighboringly along a pipe point in the same direction. In particular, a plurality of extinguishing agent outlet positions can be present along a respective pipe in an embodiment, wherein at each extinguishing agent outlet position two extinguishing nozzles are arranged that point, in relation to a projection in a horizontal plane, in opposing directions at this same extinguishing agent outlet position.

[0097] FIG. 8 shows schematically and exemplarily a further fire extinguishing system for a roof with a solar installation. The fire extinguishing system comprises an extinguishing apparatus with a group of extinguishing agent outlets 8 for discharging an extinguishing agent on the roof, the extinguishing agent outlets 8 comprising extinguishing nozzles that, pointing alternately in opposing directions, discharge extinguishing agent in a respective coverage region 9. The expression pointing alternately in opposing directions means that, in guiding direction 21, neighboring extinguishing nozzles 8 point in opposing directions, wherein the opposing directions relate to directions of the extinguishing nozzles 8 in a horizontal plane. The directions of neighboring extinguishing nozzles, as projected into an imagined horizontal plane, hence point in opposing directions. Expressed differently, the directions of neighboring extinguishing nozzles point, as viewed from above, in opposing directions.

[0098] The discharge angle of these extinguishing nozzles 8 is smaller than 360 and, in this embodiment, equal to 180. Furthermore, the coverage region 9 of a respective extinguishing nozzle 8 is, in this embodiment, essentially semicircular, wherein also this relates to a projection of the coverage region into a horizontal plane. In other embodiments, the coverage region can also comprise a different shape.

[0099] The extinguishing agent outlets 8 are arranged on a pipe system 205 via which extinguishing agent is supplied to the extinguishing agent outlets 8, wherein the extinguishing agent outlets 8 are arranged on parallel pipes of the pipe system 205 that point in guiding direction 21. The supply of extinguishing agent can, for instance, be carried out as it has been described above by reference to FIG. 4.

[0100] In this embodiment, the extinguishing apparatus comprises a further group of extinguishing agent outlets 108 for discharging the extinguishing agent on the roof, wherein the extinguishing agent outlets 108 also comprise extinguishing nozzles that, pointing alternately in opposing directions, discharge extinguishing agent into a respective coverage region 109 and comprise a horizontal discharge angle smaller than 360 which also for the extinguishing nozzles 108 in this example is 180. This second group of extinguishing agent outlets 108 is supplied with the extinguishing agent by means of a pipe system 305. Also the supply of the second pipe system 305 with the extinguishing agent can, for instance, be carried out as described above by reference to FIG. 4. In this embodiment, the pipe systems 205, 305 are entirely separated, such that the first group of extinguishing nozzles 8 and the second group of extinguishing nozzles 108 can be supplied with extinguishing agent entirely independently from each other.

[0101] In this embodiment, the extinguishing apparatus is configured such that an overlap region 230 of coverage regions 9 of two neighboring extinguishing agent outlets 8 of a same group is smaller than an overlap region 231 of coverage regions 9, 109 of neighboring extinguishing agent outlets of different groups. In particular, the coverage region of neighboring extinguishing agent outlets of different groups is, in this embodiment, more than twice as large as the overlap region 230 of coverage regions 9 of two neighboring extinguishing agent outlets 8 of a same group. The dimensions and sizes here relate preferentially to a projection of the overlap regions and coverage regions in an imagined horizontal plane. Thus, a manner of view from above is adopted here.

[0102] A further embodiment of a fire extinguishing system for a roof with a solar installation is exemplarily and schematically shown in FIG. 9. In this embodiment, the fire extinguishing system also comprises an extinguishing apparatus with a first group of extinguishing agent outlets 8 for discharging an extinguishing agent on the roof and a second group of extinguishing agent outlets 108 for discharging the extinguishing agent on the roof, wherein the first group of extinguishing agent outlets 8 and the second group of extinguishing agent outlets 108 are assigned to different extinguishing areas. The extinguishing agent outlets 8, 108 comprise extinguishing nozzles that, pointing alternately in opposing directions, discharge extinguishing agent in a respective coverage region 9, 109 and have a horizontal discharge angle smaller than 360. In this embodiment, the horizontal discharge angle is 180. The coverage regions 9, 109 of neighboring extinguishing nozzles 8, 108 of a same group overlap each other in a respective overlap region 230. Similarly as in the embodiment shown in FIG. 8, also in this embodiment an overlap region 230 of coverage regions 9 of two neighboring extinguishing agent outlets 8 of a same group is smaller than an overlap region 231 of coverage regions of neighboring extinguishing agent outlets 8, 108 of different groups.

[0103] The embodiment according to FIG. 9 however differs from the embodiment according to FIG. 8 in that the second group of extinguishing agent outlets 108 cannot discharge the extinguishing agent independently of a discharging of the extinguishing agent via the extinguishing agent outlets 8 of the first group. In particular, the extinguishing agent is in this embodiment a) dischargeable by means of the extinguishing agent outlets 8 of the first group independently of a discharging of the extinguishing agent by means of the extinguishing agent outlets 108 of the second group and b) dischargeable by means of the extinguishing agent outlets 108 of the second group in dependence of a discharging of the extinguishing agent by means of the extinguishing agent outlets 8 of the first group. To realize this, the extinguishing apparatus comprises a pipe system with a first section 405 and a second section 505, wherein the first section 405 and the second section 505 are connected to each other via valves 440.

[0104] The extinguishing apparatus is configured such that the extinguishing agent is supplied to the first section 405 of the pipe system and the second section 505 of the pipe system is also supplied with extinguishing agent if the valves 440 are opened. With opened valves 440, the supply of the extinguishing agent outlets 108 of the second group thus takes place via the first section 405 of the pipe system. The second section 505 of the pipe system does not have a direct connection to an extinguishing agent supply. Also in this embodiment the supply of extinguishing agent can, for instance, be realized as described above by reference to FIG. 4.

[0105] Although not depicted for reasons of clarity, also the fire extinguishing systems according to FIGS. 8 and 9 comprise detection apparatuses that are configured to detect, as a detection location, a location where a fire has occurred or is likely to occur. The detection apparatus preferentially corresponds to those which have been described above by reference to FIG. 4. The detection apparatus 11 can hence comprise a plurality of detectors 12 for detecting the location where a fire has occurred or is likely to occur, wherein the detectors 12 are arranged along straight lines oriented in guiding direction 21.

[0106] Although in the above embodiments the extinguishing apparatus and the solar panels are arranged in a specific manner, in other embodiments the extinguishing apparatus and/or the solar panels can also be arranged differently. For instance, opposing solar panels can be arranged inclined on the roof such that the respective higher side of the respective solar panel 10 faces the opposing solar panel, as schematically depicted in FIG. 7. Also in this embodiment, the solar installation system comprises a fire extinguishing system with extinguishing agent outlets that are preferentially configured such that the extinguishing agent is dischargeable into regions below the solar panels 10. The corresponding pipes and extinguishing agent outlets are not shown in FIG. 7 for reasons of clarity, since only an alternative arrangement of the solar panels is to be illustrated here.

[0107] Although in the embodiments described above by reference to FIGS. 1, 3 and 7 the solar panels are arranged on the roof by means of a plate, the solar panels can of course also be arranged on the roof in a different manner. For instance, the solar panels can be mounted on the roof by means of a rail system. It is also possible that the solar panels are directly mounted on the roof, i.e., in particular, without a plate being arranged between the solar panels and the roof.

[0108] The above described controllers are configured to carry out the corresponding control procedures. For this purpose, the control procedures can be implemented as program code of a computer program and/or as corresponding hardware. The controllers include, in particular, programmable logic controllers.

[0109] In the claims, the words comprise and include do not exclude other elements or steps and the indefinite article a does not exclude a plurality.

[0110] A single unit or apparatus can fulfill the functions of several items recited in the claims. The fact that individual functions and elements are recited in different dependent claims does not mean that a combination of these functions or elements could not also be used to advantageously.

[0111] A computer program can be stored and/or distributed on a suitable medium such as, for instance, an optical storage medium or a solid state medium supplied together with or as part of other hardware. The computer program may however also be distributed in other forms, such as, for instance, via the Internet or other telecommunication systems.

[0112] The reference signs in the claims are not to be understood in such a manner that the subject-matter and the scope of protection of the claims is limited by these reference signs.

LIST OF REFERENCE NUMERALS

[0113] 1 roof [0114] 2 plate [0115] 3 first row of solar panels [0116] 4 second row of solar panels [0117] 5, 105, 205, . . . , 505 horizontally extending pipes for supplying the extinguishing agent [0118] 6 vertically extending pipes for supplying the extinguishing agent to the extinguishing nozzles [0119] 7 support struts for solar panels and pipes [0120] 8, 108 extinguishing nozzle, extinguishing agent outlet [0121] 9, 109 coverage region of an extinguishing nozzle [0122] 10 solar panel [0123] 11 line-shaped heat detector [0124] 12 detector [0125] 13 pipe of foam generator to pipe 5 [0126] 14 pipe of deluge valve to foam generator [0127] 15 controller [0128] 16 wiring between heat detector and controller [0129] 17 deluge valve [0130] 18 wiring between deluge valve and controller [0131] 19 trigger mechanism, magnetic valve [0132] 20 foam generator [0133] 21 guiding direction [0134] 22 . . . 25 group action area, extinguishing area [0135] 40 overlap region of extinguishing areas [0136] 41 boundary region [0137] 42 boundary line [0138] 43 lower side of an installed solar panel [0139] 44 upper side of an installed solar panel [0140] 45 extinguishing line [0141] 230, 231 overlap region of coverage regions [0142] 440 valves