GB2476342A - Method for securing a solar panel supporting rail to a roof using a clip - Google Patents

Method for securing a solar panel supporting rail to a roof using a clip Download PDF

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Publication number
GB2476342A
GB2476342A GB1018745A GB201018745A GB2476342A GB 2476342 A GB2476342 A GB 2476342A GB 1018745 A GB1018745 A GB 1018745A GB 201018745 A GB201018745 A GB 201018745A GB 2476342 A GB2476342 A GB 2476342A
Authority
GB
United Kingdom
Prior art keywords
rail
securing
clip
roof
solar energy
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB1018745A
Other versions
GB201018745D0 (en
GB2476342B (en
Inventor
Marco Attanasio
Martyn John Charles Berry
Matthew James Burgess
Daniel Gower Davies
Andrew Gerrard Gilhooly
Malcolm John Kimberley
Ashley Graham Mckellar
Alan Charles South
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Solar Century Holdings Ltd
Original Assignee
Solar Century Holdings Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Solar Century Holdings Ltd filed Critical Solar Century Holdings Ltd
Priority to EP12001306.5A priority Critical patent/EP2461120B1/en
Priority to PCT/GB2010/002255 priority patent/WO2011073612A2/en
Priority to EP10796098A priority patent/EP2457034A2/en
Publication of GB201018745D0 publication Critical patent/GB201018745D0/en
Publication of GB2476342A publication Critical patent/GB2476342A/en
Application granted granted Critical
Publication of GB2476342B publication Critical patent/GB2476342B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S25/00—Arrangement of stationary mountings or supports for solar heat collector modules
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S20/00—Supporting structures for PV modules
    • H02S20/20—Supporting structures directly fixed to an immovable object
    • H02S20/22—Supporting structures directly fixed to an immovable object specially adapted for buildings
    • H02S20/23—Supporting structures directly fixed to an immovable object specially adapted for buildings specially adapted for roof structures
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403—Connection details of the elongated load-supporting parts
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage; Sky-lights
    • E04D13/04—Roof drainage; Drainage fittings in flat roofs, balconies or the like
    • E04D13/064—Gutters
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D3/00—Roof covering by making use of flat or curved slabs or stiff sheets
    • E04D3/36—Connecting; Fastening
    • E04D3/3608—Connecting; Fastening for double roof covering or overroofing
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F13/00—Coverings or linings, e.g. for walls or ceilings
    • E04F13/07—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor
    • E04F13/08—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor composed of a plurality of similar covering or lining elements
    • E04F13/0801—Separate fastening elements
    • E04F13/0803—Separate fastening elements with load-supporting elongated furring elements between wall and covering elements
    • E04F13/0805—Separate fastening elements with load-supporting elongated furring elements between wall and covering elements with additional fastening elements between furring elements and the wall
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F13/00—Coverings or linings, e.g. for walls or ceilings
    • E04F13/07—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor
    • E04F13/08—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor composed of a plurality of similar covering or lining elements
    • E04F13/0801—Separate fastening elements
    • E04F13/0803—Separate fastening elements with load-supporting elongated furring elements between wall and covering elements
    • E04F13/081—Separate fastening elements with load-supporting elongated furring elements between wall and covering elements with additional fastening elements between furring elements and covering elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S20/00—Solar heat collectors specially adapted for particular uses or environments
    • F24S20/60—Solar heat collectors integrated in fixed constructions, e.g. in buildings
    • F24S20/67—Solar heat collectors integrated in fixed constructions, e.g. in buildings in the form of roof constructions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S25/00—Arrangement of stationary mountings or supports for solar heat collector modules
    • F24S25/30—Arrangement of stationary mountings or supports for solar heat collector modules using elongate rigid mounting elements extending substantially along the supporting surface, e.g. for covering buildings with solar heat collectors
    • F24S25/33—Arrangement of stationary mountings or supports for solar heat collector modules using elongate rigid mounting elements extending substantially along the supporting surface, e.g. for covering buildings with solar heat collectors forming substantially planar assemblies, e.g. of coplanar or stacked profiles
    • F24S25/35—Arrangement of stationary mountings or supports for solar heat collector modules using elongate rigid mounting elements extending substantially along the supporting surface, e.g. for covering buildings with solar heat collectors forming substantially planar assemblies, e.g. of coplanar or stacked profiles by means of profiles with a cross-section defining separate supporting portions for adjacent modules
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S25/00—Arrangement of stationary mountings or supports for solar heat collector modules
    • F24S25/30—Arrangement of stationary mountings or supports for solar heat collector modules using elongate rigid mounting elements extending substantially along the supporting surface, e.g. for covering buildings with solar heat collectors
    • F24S25/33—Arrangement of stationary mountings or supports for solar heat collector modules using elongate rigid mounting elements extending substantially along the supporting surface, e.g. for covering buildings with solar heat collectors forming substantially planar assemblies, e.g. of coplanar or stacked profiles
    • F24S25/37—Arrangement of stationary mountings or supports for solar heat collector modules using elongate rigid mounting elements extending substantially along the supporting surface, e.g. for covering buildings with solar heat collectors forming substantially planar assemblies, e.g. of coplanar or stacked profiles forming coplanar grids comprising longitudinal and transversal profiles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S25/00—Arrangement of stationary mountings or supports for solar heat collector modules
    • F24S25/60—Fixation means, e.g. fasteners, specially adapted for supporting solar heat collector modules
    • F24S25/61—Fixation means, e.g. fasteners, specially adapted for supporting solar heat collector modules for fixing to the ground or to building structures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S25/00—Arrangement of stationary mountings or supports for solar heat collector modules
    • F24S25/60—Fixation means, e.g. fasteners, specially adapted for supporting solar heat collector modules
    • F24S25/65—Fixation means, e.g. fasteners, specially adapted for supporting solar heat collector modules for coupling adjacent supporting elements, e.g. for connecting profiles together
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S30/00—Arrangements for moving or orienting solar heat collector modules
    • F24S30/20—Arrangements for moving or orienting solar heat collector modules for linear movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S40/00—Safety or protection arrangements of solar heat collectors; Preventing malfunction of solar heat collectors
    • F24S40/40—Preventing corrosion; Protecting against dirt or contamination
    • F24S40/44—Draining rainwater or condensation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S20/00—Supporting structures for PV modules
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S25/00—Arrangement of stationary mountings or supports for solar heat collector modules
    • F24S2025/80—Special profiles
    • F24S2025/803—Special profiles having a central web, e.g. I-shaped, inverted T- shaped
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/10—Photovoltaic [PV]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/20—Solar thermal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/47—Mountings or tracking
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

Abstract

The method comprises placing a clip 601 over an upstanding element 408 in the rail 202 and securing the clip, which may be done using a fixing means through an aperture in the clip, to a roof element 104. The clip comprises a downwardly facing channel which is open at both ends of the clip, the clip securing the rail such that it is still possible to move the the rail in the direction parallel to the longitudinal axis of the clip. There may additionally be a second clip for securing the opposite side of the rail. A bracket may be secured between the rail and the clip. Two rails may be joined together using a joiner piece.

Description

I
Clip For Use In Apparatus For Securing A Solar Energy Collection Device As Part Of A Weatherproof Roof
CROSS REFERENCE TO RELATED APPLICATIONS
This application claims priority from United Kingdom Patent Application No. 09 21 969.2, filed 16 December 2009.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a clip for securing rails that form part of a solar-energy-collecting weatherproof roof.
2. Description of the Related Art
Installation apparatus for supporting solar energy collection devices are known. Typically, installation apparatus is arranged to support the solar energy collection devices at a particular inclination and orientation relative to a support surface. In many applications, the support surface is a roof of a building.
BRIEF SUMMARY OF THE INVENTION
According to a first aspect of the invention there is provided a clip according to claim 1.
According to a second aspect of the invention there is provided a method of securing a rail to a roof element according to claim 4.
* .*... * *
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
Figure 1 shows a solar energy collection device secured as part of a roof structure of a building; **.* * * * ** * * * Figure 2 shows installation apparatus for use in securing a solar energy collection device as part of a roof; Figure 3 shows a solar energy collection device; Figure 4 shows a rail for supporting a solar energy collection device; Figure 5 shows a cap strip for clamping solar energy collection devices in place; Figure 6 illustrates a rail being secured to a purlin; Figure 7 shows a horizontal element; Figure 8 shows a horizontal element supported on a rail; Figure 9A shows a front view of a drip bar; Figure 9B shows a back view of a drip bar; Figure 10 illustrates a drip bar attached to a horizontal element; Figure 11 shows how solar energy collection devices are installed; Figure 12 shows a rail and two horizontal elements supporting two solar energy collection devices; Figure 12a shows a rail and two horizontal elements supporting two solar energy collection devices, the rail being immoveably connected to a purlin; Figure 13 shows a vertical cross section along a join between two solar energy collection; Figure 14 shows an end cap; Figure 15A shows a front view of a joiner piece; Figure 15B shows a back view of a joiner piece; *.S. . . . . . * Figure 16 shows a joiner piece connecting two sections of rail; and * S....
* 25 Figure 17 shows steps taken to install the apparatus shown in the * * : Figures.
S..... * * S... * S S S. *
*S.S.. S *
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Figure 1 Figure 1 shows a solar energy collection device 101 secured as part of a roof structure 103 of a building 102. In this example, building 102 is an agricultural building such as a barn. Roof 103 comprises rafters, such as rafter running from the ridge of the roof to the eaves, and purlins, such as purlin 104 secured to the rafters and running horizontally along the roof. The solar energy collection devices are secured to these purlins.
The solar energy collection device is secured so as to form part of roof 103. In this example solar energy collection device 101 is a photovoltaic device. However, solar energy collection device 101 may be a solar-thermal device.
The integration of solar energy collection devices as part of a roof provides an architectural feature that also allows the building to generate electrical power. In many countries, local power generation from renewable sources is encouraged. In some instances, it is possible for a user to obtain payment for power supplied to an external source, such as a national grid, at a rate that is higher than the user must pay for receiving power from that external source. Consequently, a user may gain financially if the environment is optimised so as to maximise power generation while at the same time minimising power consumption.
Since the array of solar energy collection devices forms part of the roof, rather than sitting on top of the roof, it is important that it be as weatherproof as any normal roof. Water should be prevented from entering the building if at all possible. * * * * **** * * * ** I * *
Figure 2 Figure 2 shows installation apparatus 201 for use in securing a solar energy collection device as part of a roof. The term part of a roof' is used herein to generally describe the installation of solar energy modules as part of, rather than on top of, a ioof. Typically, therefore, solar energy collection devices may be installed so as to be flush with common roofing materials.
Thus, for example, when installed as part of a roof, solar energy collection devices may be perceived as replacing the outermost layer of a roof structure, that presents the outer surface of the roof, and for example allows flashing to be used at interfaces in the normal way.
Apparatus 201 comprises a number of rails, such as rail 202, secured to the purlins. The apparatus also comprises a plurality of horizontal elements, such as horizontal element 203. The rails extend perpendicularly to the purlins, down the roof from the ridge to the eaves. The horizontal elements sit on the rails perpendicular to them and parallel to the purlins. The rails are spaced apart by a distance slightly longer than the short sides of a solar energy collection device, and the horizontal elements are spaced apart by a distance slightly longer than the long sides. Each solar energy collection device is therefore placed in the aperture defined by two rails and two horizontal elements.
Each of the rails and horizontal elements has a support plane on which an edge of a solar energy collection device rests. Thus each solar energy collection device is supported around all four edges and held away from the purlins.
* S. .51 * I Figure3 Figure 3 shows solar energy collection device 101. It consists of an S... * *. 55. *
SSsl*i * aluminium frame 301 which supports a photovoltaic sheet 302. A view of a cross-section through the device is shown in dotted lines, showing the shape of the frame 301. The joints between the edges of sheet 302 and frame 301 are sealed, for example by seals 303 and 304. These may be silicone extruded gasket-type seals, gunned-in mastic or pieces of compressed foam.
Four lower edges of solar energy collection device 101 are defined by the four lower edges of the frame. These edges are supported by the installation apparatus herein described in order to support the weight of the solar energy collection device 101.
In the example described herein the solar energy collection devices are oriented, when installed in an array, such that the short edges extend in the direction that the purlins extend. This orientation is referred to herein as portrait'. In an alternative arrangement, the solar energy collection devices are oriented such that the long sides extend in the direction that the purlins extend.
This orientation is referred to herein as landscape'. In this example, solar energy collection device 101 is substantially rectangular, but a square one could also be used.
The nature of seals 303 and 304 varies depending on the manufacturing method of the solar energy collection device, and after installation the seals may degrade over time. Thus it cannot be guaranteed that these seals are weatherproof. Solar energy collection devices often have drainage holes, such as drainage hole 305, which allow any water that does get through the seals to drain away. S. S.
Given that solar energy collection devices such as device 101 are * S....
* 25 frequently not weatherproof, installation apparatus 201 therefore not only * : provides support for the devices but also has water management features to S.....
* ensure that any water that does drain from the bottom of a solar energy S... * *1
SI S
S
S.....
S S
collection device is carried away, and not allowed to leak into building 102.
Figure 4 A portion of rail 202 is shown in more detail in Figure 4. It comprises an upwardly thrusting element 401, two horizontal support planes 402 and 403, two edges 404 and 405 defining side gutters 406 and 407, two upstanding elements 408 and 409, and two feet 410 and 411. The rail is symmetrical and thus for each of these pairs of elements, one is on each side of upwardly thrusting element 401.
On each side of rail 202, the support plane 402 or 403 provides support for a long edge of a solar energy collection device, while the side gutter 406 or 407 carries away any water that collects on that side. Above the support planes, the sides of the upwardly thrusting element 401 are straight; thus on each side the support plane and the side of the upwardly thrusting element form a right angle suitable for receiving the lower edge of a solar energy collection device. The support planes are relatively narrow. This discourages water collection and backtracking underneath the solar energy collection device, and encourages precise installation.
Rail 202 further includes screw flutes 412 and 413 so that end caps can be fitted to the ends of the rail. These are configured so that the openings face downwards in order that water cannot collect in them.
Rail 202 is fixed directly to purlin 104, as shown in Figure 6.
Rail 202 is constructed from extruded aluminium that can then be cut to * S *. ** length, which is the height of the array of solar energy collection devices to be * S.5*5 * installed. Alternatively, shorter lengths can be used and fixed together with joiner pieces, as shown in Figure 16.
* In order to reduce the weight and cost, the internal part of upwardly * * S ** S
I
S.....
thrusting element 401 is mainly hollow. It comprises two box sections, upper box section 414 and lower box section 415. Fixings are made into upper box section 414 from the top, meaning that water may penetrate it. Fixings may be made into lower box section 415 from the bottom for cable management, and so water should not be present in this section. Thus the two box sections are kept separate.
Figure 5 Figure 5 shows a portion of a cap strip 501. Referring back to Figure 4, when two solar energy collection devices are supported, one by each of support planes 402 and 403, cap strip is placed over rail 202 to cover the gap between the devices. Strips of foam 502 and 503 provide a seal between cap strip 501 and the frames of the solar energy collection devices. Because the quality of this seal can be controlled at installation, it should not leak during the lifetime of the roof. However, should the seal fail any water will be directed into one of side gutters 406 and 407.
Cap strip 501 is fixed with screw fixings into upper box portion 414 of rail 202. When these fixings are tightened, the cap strip clamps the solar energy collection devices to the rails.
Figure 6 Rail 202 is fixed to purlin 104 using clips 601 and 602. Clip 601 has an overlap portion 601a that fits over upstanding element 408, while clip 602 fits *S..
in a similar fashion over upstanding element 409. Clip 601 is secured to purlin * **.** * 104 using a fixing means such as screw fixing 603 through an aperture defined in securing portion 601b. Clip 602 is similarly secured using screw fixing 604.
In addition, when fixing the rail to some purlins, L-shaped brackets 605 S... * S * S. *
S
*.*S..
S S
and 606 may be used. Bracket 605 has a foot portion 607 and a perpendicular upright section 608. An aperture 609 is formed in foot portion 607 and a second aperture 610 is formed in upright portion 608. Bracket 606 is similar.
The use of these brackets will be described further with respect to Figure 12a.
Figure 7 As can be seen in Figure 2, each solar energy collection device is supported along its long edges by two rails, such as rail 202. Each of the short edges is supported by a horizontal element such as horizontal element 203, a portion of which is shown in Figure 7. It should be noted that a solar energy collection device can be installed in the landscape orientation instead, depending upon the configuration of the roof and the solar energy collection devices. However, in all cases the rails run up and down the roof and the horizontal elements are placed horizontally.
Horizontal element 203 comprises an upwardly thrusting tongue 701.
Like rail 202, horizontal element 203 is symmetrical about this tongue. It therefore comprises two channels 702 and 703, one on each side, and two support planes 704 and 705, one on each side. Like rail 202, the support planes are relatively narrow.
Horizontal element 203 is constructed from extruded aluminium that can then be cut to size depending on the width of the solar energy collection devices to be installed, and hence on the distance between the rails.
Thus, upon installation, each support plane supports a short edge of a solar energy collection device. The devices abut tongue 701, thus being held *.S.S.
* S in place. In order to minimise the weight of horizontal element 703, tongue 701 is not the same width all the way up, but is formed with a flange at the top which defines the separation of vertically adjacent solar energy collection *..* * S S
SS S
S.....
panels. Similarly, the space underneath the support planes is hollow. Fixings may be made into this hollow portion 706 for cable management, and therefore it should be kept dry.
Figure 8 The way in which rail 202 and horizontal element 203 interact is shown in Figure 8. Once rail 202 has been fixed in position to the purlins as shown in Figure 6, horizontal element 203 is placed upon the edge. 404 of rail 202. The two pieces are so dimensioned such that support plane 402 of rail 202 and support planes 704 and 705 of horizontal element 203 are aligned with respect to the pitch of the roof, thus providing a series of surfaces on which the edges of a solar energy collection device can be placed.
The joint between the edge 404 of rail 202 and the underside of horizontal element 203 can be sealed with a gasket, or a drip bar may be used.
Figures 9A and 9B Figures 9A and 9B show front and back views respectively of a drip bar 901. Drip bar 901 is configured to fit over the end of a horizontal element, such as horizontal element 203, and prevent water from backtracking underneath the horizontal element when it drips out of a channel.
Drip bar 901 is fabricated from a suitable plastic and comprises a flat surface 902 attached to a perpendicular skirt 903. The skirt has a trapezium **S$ shape to provide extra protection at each side of the horizontal element, *.*..
* because the element is tilted in use. It further comprises two upstanding sides 904 and 905, each having a clip 906 and 907 respectively, and an upstanding central element 908. * S S ** *
I * I,
Figure 10 Figure 10 illustrates drip bar 901 fitted to an end of a horizontal element.
The two sides 904 and 905 clip around the sides of a horizontal element 1001, with the clips 906 and 907 holding it in place. Central element 908 prevents water from entering the hollow portion of horizontal element 1001.
Horizontal element 1001 is then placed on an edge of rail 202. Any water in channel 1002 or 1003 of horizontal element 1001 drips into side gutter 407 of rail 202. Drip bar 901 prevents the water from backtracking under horizontal element 1001, dripping around the edge of a channel, or entering the hollow portion of horizontal element 1001.
Figure 11 An array of solar energy collection devices are installed as shown in Figure 11. A plurality of rails, such as rails 1101, 202 and 1102, are laid out running eave to ridge, equally spaced across the roof, or across the area of the roof to be covered by the array. A horizontal element is placed between and upon each pair of rails, and a solar energy collection device is placed with its long edges being supported by the pair of rails, and its lower short edges being placed upon the horizontal element. A further horizontal element can then be placed on the pair of rails, and allowed to slide underneath the top short edge of the solar energy collection device. A further solar energy collection device is then placed upon the rails and this horizontal element. In this way, the horizontal elements are held in place by the solar energy collection devices. S...
The horizontal elements and solar energy collection devices are both S...
* supported bythe rails.
The weight of the solar energy collection devices is in this embodiment also taken by the horizontal elements. However, this is not necessary as the S...
S S S
S
S. .0 ( t rails are sufficient to support the weight of the devices. In this embodiment, the bottom of the devices are in contact with the support planes of the horizontal elements because this allows the horizontal elements to be clamped between the devices and the rails. However, in other embodiments this might not be the case.
The lower short edges of the row of solar energy collection devices lowest down the roof, adjacent the eave, do not rest upon a horizontal element, but form the lower edge of the roof. Any water dripping from the underside of these solar energy collection devices can drip directly into a roof gutter at the eave.
Figure 11 illustrates a portion of the array half way up the roof, where, for example, solar energy collection device 1103 is to be supported by rails 1101 and 1102 and horizontal elements 1104 and 1105. The gap between solar energy collection device 1103 and its horizontally adjacent solar energy collection device 1106 is filled by a portion of a cap strip, such as cap strip 501. The gap between solar energy collection device 1103 and its vertically adjacent solar energy collection device 1107 is filled by a piece of compressible foam, which forms a weatherproof seal.
Figure 12 A view down the roof shown by arrow A in Figure 11 is illustrated in Figure 12. Rail 202 is secured to purlin 204 by clips 601 and 602. Horizontal element 1108 rests on edge 405 of rail 202, while horizontal element 1104 rests on edge 404 of rail 202.
Solar energy collection device 1106 is placed upon support plane 403 of rail 202, and a support plane (not visible) of horizontal element 1108.
Similarly, solar energy collection device 1103 is placed on support plane 403 *1 $.SS.L)
S
of rail 202 and a support plane (not visible) of horizontal element 1104.
Cap strip 501 covers and seals the gap between solar energy collection devices 1103 and 1106. It is fixed into place with a self-drilling screw 1201.
When tightened, this clamps each solar energy collection device onto its supporting planes. This also has the effect of clamping each horizontal element onto rail 202. Thus the rails and horizontal elements form an apparatus that supports solar energy collection devices without any need for additional screw holes through either the devices, the rails or the horizontal elements. This improves the water management of the system, since any screw hole is a possible water avenue; further, having fewer screws reduces installation time and complexity. With this installation apparatus, any water that seeps through any of the gaps between the solar energy collection devices, or through a joint in a solar energy collection device, will be caught in either the side gutters of the rails or the channels of the horizontal elements. Any water in the channels drains into one of the side gutters, as shown in Figure 12, and then it only remains to manage the run-off from the side gutters, for example by allowing then to drain into a standard roof gutter at the eave.
Further, by restricting any water to the channels and the side gutters, water is prevented from entering the dry side' of the installation. The wet side is defined as being the channels and tongue of each horizontal element, and the area of each rail between and above the two edges, including the top box section. All the rest of the roof is considered to be the dry side. The fixings to the top of the array, such as the joints of the solar energy collection devices, and the cap strip fixings, are on the wet side of the installation. On the dry side **S.I.
* 25 are the fixings into purlin 104 of clip 601 and 602, and other fixings, such as e:... those for cable management, into the lower box section of each rail and the hollow portion of each horizontal element. It is therefore important that these -* * -, I
II S
S 5I55I * 4
areas be kept dry so that these fixings do not become possible leak sites.
Below the purlins there is generally no further weatherproofing or ceiling, and therefore any water leaking through would drip directly into the building.
The installation may also include module protection sheets to catch any water that escapes to the dry side. These should not be necessary but can be useful to protect the solar energy collection devices from the underside.
Figure 12a Clips 601 and 602 secure rail 202 to purlin 104 in a manner that allows for the thermal expansion of rail 202. Over a typical temperature range for a roof, a metal object such as rail 202 can expand by around 1mm per metre.
For a rail several metres long, therefore, thermal expansion is not insignificant.
If the rail were secured to each purlin without being able to move, thermal expansion could cause damage to the array. The method of securing herein described, using clips 601 and 602, allows for thermal expansion. Because an open-ended downwardly facing channel in each clip interlocks with a respective upstanding element of a rail, each rail can move up and down the roof (ie in the direction of the pitch of the roof), thus allowing for thermal expansion, but cannot move side to side (ie horizontally), thus keeping the array secure on the roof.
In an embodiment, each rail is additionally and immovably secured to a * single purlin, fixing it in position to that purlin. This additional securing provides a fixed point about which the rail can expand. This would typically be at the top-most purlin, ie the one highest up the roof.
*.. *..
* A method of providing this additional securing is illustrated in Figure * 25 12a. L-shaped bracket 605, illustrated in Figure 6, is secured to purlin 104 by I... -passing screw 604 through aperture 609 before passing it through clip 602. *
Thus, foot portion 607 of bracket 605 is held against the top of clip 602. A further screw 1202 is used to secure the upright portion 608 of bracket 605 to edge 405 of rail 202. Bracket 606 is similarly attached on the other side of rail 202.
These brackets attach the rail to this purlin in a non-moveable fashion.
Thus, any expansion of the rail will cause movement within the clip on the other purlins, but not the one to which it is immoveably attached.
Figure 13 Figure 13 is a cross-section along the join between two vertically adjacent solar energy collection devices 1103 and 1107, viewed from the side.
The top short edge of solar energy collection device 1107 rests on the downward facing support plane 705 of horizontal element 203, while the lower short edge of solar energy collection device 1103 rests on the upward facing support plane 703 of horizontal element 203. Compressible foam strip 1301, compressed under the weight of solar energy collection device 1103, provides a seal for the gap between the two devices.
Any water seeping through the joints of solar energy bollection device 1103 will tend to do so at the lower joint 1302, thus collecting in upper channel 703 of horizontal element 203. Also, any water leaking from the joint sealed by foam 1301 will find its way to lower facing channel 702 of horizontal element *..* 203. Both of these channels then drain into a side gutter of a rail.
Water may also seep through the joints on the long side of a solar energy collection device. In this case, it will drip through a drainage hole into a side gutter of the supporting rail.
It can be seen in Figure 13 how the upwardly facing tongue 701 provides a spacing element between solar energy collection devices 1103 and 1107. Similarly, referring back to Figure 12, upwardly thrusting element 401 of rail 202 provides a spacing element between solar energy collection devices 1103 and 1106. Thus, as long as the rails are installed parallel with each other, the rails and horizontal elements provide a natural method of squaring-up' the solar energy collection devices. Because the solar energy collection devices sit on the support planes of the rails and the horizontal elements and are separated by the upwardly thrusting elements of the rails and the upwardly thrusting tongues of the horizontal elements, the solar energy collection devices will naturally square up under gravity. Thus it is easier for the installer to put them all into place before clamping them all into position with the cap strips. An array of solar energy collection devices in which the devices are exactly square to each other is not only aesthetically pleasing but more likely to be weatherproof.
Figure 14 At the bottom of the array, at the eave of the roof, an end cap, such as end cap 1401 shown in Figure 14, is fixed to each rail by fixing through each of screw holes 1402 and 1403 into one of the screw flutes in the rail. It comprises a short length of extruded aluminium with a corrugated cross-section. It provides a windshield for the side gutters of the rail to which it is fixed, to prevent water being blown back up them in windy conditions. *4.* * *
Figures 15A and 158 The foregoing description describes a solar-energy-collecting * : weatherproof roof including an array whose size is limited by the length of the ***.** * rails, such as rail 202. There is an upper bound to the length of rail that can be transported and handled; further, it may reduce transportation and other costs * * S to use shorter lengths of rail. It would therefore be advantageous to be able to join two lengths of rail together, either to increase the size of the array or to reduce costs of installing a smaller array. However, such a join must be watertight in order to preserve the weatherproof nature of the array.
Figures 15A and 15B show a front and back view respectively of a suitable joiner piece 1501. It is fabricated from a suitable plastic and comprises an outer section 1502 and an inner section 1503. Outer section 1502 is configured to fit around the outside of a first section of rail, while inner section 1503 is configured to fit inside the side gutters of a second section of rail.
Outer section 1502 comprises an upstanding peg 1504 configured to locate between the feet of the first section of rail (a screw may be fixed into the lower box section here), and two screw holes 1505 and 1506, so that joiner piece 1501 can be fixed to the edges of the first section of rail.
Inner section 1503 is ribbed to provide flexibility and a tight fit within the side gutters of the second section of rail. It comprises a first gutter portion 1507 and a second gutter portion 1508, each configured to fit within one side gutter. Gutter portion 1507 has a low outer side 1509 and a high inner side 1510, and gutter portion 1508 is symmetrically similar. The high sides of the gutter portions are configured to locate underneath the screw flute of the second section of rail. The two gutter portions are connected by a central portion 1511 configured to cover the lower box section of the second section of *.S. . rail, which is open.
S..... * ,
* Figure 16 *.**.S Figure 16 shows joiner piece 1501 joining two sections of rail 1601 and 1602. Outer portion 1502 of joiner piece 1501 fits around the outside of rail *.*.
section 1601, while inner portion 1503 of joiner piece 1501 fits inside the side ****.* * . gutters 1603 and 1604 of rail section 1602. Any water in one of the side gutters of rail section 1601 passes via the inner portion 1503 of joiner piece 1501 to the corresponding side gutter of rail section 1602.
Joiner piece 1501 is held in place by the outward pressure of each of the gutter portions and the location of the high side of each portion under the screw flutes. Thus, for example, the high side 1510 of gutter portion 1507 is located against the underside of screw flute 1605. This prevents twisting of the joiner piece in relation to rail section 1602.
Joiner piece 1501 may be secured to rail section 1601, for example by screws, through the screw holes, hole 1506 being shown. These screw holes are so high up the side of the gutter that water would not leak through them, since water is not expected to reach a high level in the side gutters.
In addition to joiner piece 1501, an alignment component fabricated from metal may be used to join the two rail sections. Such a component would provide structure so that the rails are aligned during installation and remain so for the life of the array.
When two rail pieces are joined together to form a rail, then it may still be preferred to attach each rail piece irnmoveably to a purlin, as described with respect to Figure 12a. In this case, the higher piece (ie the rail piece further up the roof) is immoveably attached to the purlin directly above the join, and the lower piece is immoveably attached to the purlin directly below the join. This prevents the joiner piece from being damaged by expansion of the rail.
* ..*.S * * * Figure 17 **.*s* * Figure 17 illustrates steps taken to install the apparatus described herein. **S.
At step 1701 rails are secured to purins, using the clips described. * *
Each eave to ridge rail may be either a single rail or a number of rail sections joined with joiner pieces as shown in Figure 16. At step 1702, a solar energy collection device is placed on a pair of rails, and at step 1703 a horizontal element is placed above and under the top edge of the solar energy collection device. These steps are repeated as necessary for the number of devices to be installed.
At step 1704 foam strips are placed between vertically adjacent solar energy collection devices, and at step 1705 cap strips are placed on horizontally adjacent solar energy collection devices. At step 1706 the cap strips are fixed into place. *S.S * *
S
**S... * S
S
***S.. * S
S * * S... * SS S. S
* ..**.
S

Claims (10)

  1. Claims 1. A clip for securing a rail to a roof element, comprising an overlap portion for contacting a rail, and a securing portion for securing to a roof element, said overlap portion having an downwardly facing channel configured to interlock with an upstanding element of a rail, said channel being open at both ends; such that in use the clip secures a rail such that the rail is free to move up and down the roof but not side to side.
  2. 2. A clip according to claim 1, wherein said securing portion defines an aperture through which a fixing means may pass in order to secure said clip to a roof element.
  3. 3. A clip according to either of claims I or 2, wherein said clip is symmetrical about an axis passing through said overlap portion and said securing portion.
  4. 4. A method of securing a rail for supporting a solar energy collection device to a roof element, said rail having an upstanding element, comprising the steps of: ***.placing a clip over said upstanding element, and securing said clip to said roof element, wherein *.**..said clip has a downwardly facing channel, open-ended at both ends, that interlocks with said upstanding element such that when said rail is *.S.secured, said rail is free to move up and down the roof but not side to side.
  5. 5. A method according to claim 4, wherein said step of securing said clip to said roof element comprises passing a fixing means through an aperture defined by said clip and securing said fixing means to said roof element.
  6. 6. A method according to either of claims 4 or 5, wherein said rail has two upstanding elements, and said method comprises securing said rail using two clips, one on each upstanding element.
  7. 7. A method of securing a rail to a roof, comprising the steps of: securing a rail to at least one roof element at a plurality of securing points using the method of any of claims 4 to 6; and at one additional securing point: placing a clip over said upstanding element, and securing said clip to a roof element, wherein said clip has a downwardly facing channel, open-ended at both ends, that interlocks with said upstanding element, and securing said clip to said rail in an immoveable fashion; such that the rail is not free to move at this additional securing point.
  8. 8. A method according to claim 7, wherein said step of securing said **S.clip to said rail comprises the steps of: securing a bracket to said clip, and S.....* : 25 securing said bracket to said rail. * * *S*.
  9. 9. A method according to either of claims 7 or 8, wherein said S * additional securing point is the securing point that is highest up the rail.
  10. 10. A method of securing two rails to a roof, comprising the steps of: aligning said rails in a direction parallel to the pitch of the roof; securing each rail to at least one roof element using the method of either claim 7 or 8; and joining said rails using a joiner piece; wherein: the additional securing point for each rail is the securing point adjacent the joiner piece. * * **..S *SS.S * * * * *S** **** * S S... * S SIS S *5I55 * I
GB1018745.8A 2009-12-16 2010-11-05 Securing a solar energy collection device as part of a weatherproof roof Expired - Fee Related GB2476342B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP12001306.5A EP2461120B1 (en) 2009-12-16 2010-12-13 Joining system and Method of installing a weatherproof solar energy collection array as part of a roof
PCT/GB2010/002255 WO2011073612A2 (en) 2009-12-16 2010-12-13 Securing a solar energy collection device as part of a weatherproof roof
EP10796098A EP2457034A2 (en) 2009-12-16 2010-12-13 Securing a solar energy collection device as part of a weatherproof roof

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GB0921969.2A GB2476256B (en) 2009-12-16 2009-12-16 Securing a solar energy collection device as part of a weatherproof roof

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GB2476342A true GB2476342A (en) 2011-06-22
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GB1018744.1A Expired - Fee Related GB2476341B (en) 2009-12-16 2010-11-05 Apparatus for securing a solar energy collection device as part of a weatherproof roof
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GB1018744.1A Expired - Fee Related GB2476341B (en) 2009-12-16 2010-11-05 Apparatus for securing a solar energy collection device as part of a weatherproof roof

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GB0921969D0 (en) 2010-02-03
EP2457034A2 (en) 2012-05-30
WO2011073612A3 (en) 2012-03-01
GB2476341A (en) 2011-06-22
GB201018745D0 (en) 2010-12-22
GB2476341B (en) 2012-11-07
GB2476256A (en) 2011-06-22
EP2461120A3 (en) 2012-07-11
EP2461120A2 (en) 2012-06-06
GB2476342B (en) 2012-11-07
GB201018744D0 (en) 2010-12-22
EP2461120B1 (en) 2013-09-18
GB2476256B (en) 2016-05-04
WO2011073612A2 (en) 2011-06-23

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