GB2482129A

GB2482129A - Roof ventilation louvre having upward passages with concave upper surface

Info

Publication number: GB2482129A
Application number: GB1012114.3A
Authority: GB
Inventors: Nicholas John Hopper; Anthony Francis Cull
Original assignee: VKR Holding AS
Current assignee: VKR Holding AS
Priority date: 2010-07-19
Filing date: 2010-07-19
Publication date: 2012-01-25
Anticipated expiration: 2030-07-19
Also published as: GB201012114D0; GB2482129B; US20130196587A1; AU2011281363A1; WO2012010825A1; CN103080661A; EP2580532A1; EP2580532B1; CN103080661B; AU2011281363B2

Abstract

A ventilation arrangement for a building with an air duct extending from roof level, has air openings extending around a housing 10 at an upper end of the air duct, the openings having louvres 12 with passages 14 one above the other, the passages 14 extending upwardly inwards to prevent rain ingress and an upper surface 26 of the passage being concavely curved to urge air to turn downwardly. The housing 10 can receive air on a windward side and expel air on a leeward side. Some louvres 16 are static, while others 18 are movable by interconnecting linkage bars (34, fig 4) to close the passages 14 (fig 3). A slot 32 of the movable louvres 18 engages a flange 20 or the static louvres 16.

Description

Ventilation Arrangements The present invention relates to a ventilation arrangement for ventilating a building interior.

The provision of adequate ventilation is an important consideration in building design. The combination of heat gains generated within buildings by occupants and electrical equipment and solar heat gain can cause a significant build up of heat and, therefore overheating.

Air conditioning or other mechanical ventilation systems can be used to provide ventilation to buildings to address these difficulties. However, such systems consume electricity and can, therefore, be relatively expensive to operate.

One prior arrangement is to provide a duct extending from just above roof level into a building, with the upper end of the duct connecting to outwardly facing openings extending around the duct. During use air can enter the windward side of the duct through respective openings, with stale air exiting from the building through respective openings on the leeward side of the duct.

In such a configuration, the duct is divided by radial dividers, which 25 could for instance divide the duct into four quadrants, with the quadrant nearest the windward side receiving the most air to ventilate the building, : whilst the majority of air extracted from the building exits through the opposite * quadrant on the leeward side of the arrangement. S... * . *..

*.: 30 Such arrangements have operated successfully in providing ventilation with little or no power input. However, problems can be encountered in extreme weather with such arrangements, for example with very heavy rain and particularly snow, leading to ingress of precipitation into the apparatus.

According to the present invention there is provided a ventilation arrangement for ventilating a building interior, the ventilation arrangement comprising: an air duct which extends in use from roof level into an interior of the building to be ventilated to convey air between the exterior and interior of the building; ventilation openings which extend around an upper part of the air duct to direct moving air caused by wind movement into or out of the air duct; the ventilation openings having a louvre configuration defining a plurality of discrete openings, one above each other; the louvre configuration being configuted such that each opening is defined by a passage extending from the exterior into the ventilation arrangement; the passage extending generally upwardly inwards to avoid the ingression of liquids and other precipitation; with an upper surface of the passage being concavely curved to urge downwardly air entering through the passage.

The passage may extend upwardly, and at an inclination of between 20 and 400.

The upper surface of an inner part of the passage may be concavely curved.

The upper surface of the inner part of the passage may extend inwardly for a distance of between 35 and 60mm, and more particularly *.S.

between 40 and 50mm. * *

The curved upper surface of the inner part of the passage may have a radius of between 55 and 65mm. S...

The upper surface of an outer part of the passage may be concavely curved.

The upper surface of the outer part of the passage may extend inwardly for a distance of between 35 and 60mm, and more particularly between 40 and 50mm.

The curved upper surface of the outer part of the passage may have a radius of between 30 and 50mm, and more particularly between 35 and 45mm.

The outermost part of the upper surface of the outer part of the passage may extend substantially vertically.

The lower surface of an inner part of the passage may be concavely curved to accelerate air entering through the passage.

The lower surface of the inner part of the passage may have a radius of between 35 and 45m.

The mouth of the ventilation opening may be between 30 and 70mm wide, and more particularly between 40 and 60mm wide, and especially between 45 and 55mm wide.

The louvre configuration may be active so as to selectively partially or wholly close the passages. The louvre configuration may comprise a plurality of movable first components and static second components, with the first components being simultaneously movable with each other, with each passage being defined between a respective pair of first components and a respective pair of second components. S... * * S...

*. : The first components may be moveable over a distance of 40 and * 30 70mm, and more particularly 50 and 60mm, between fully open and fully close positions.

The first components may each extend vertically for between 40 and 70mm, and more particularly 50 and 60mm.

The second components may define an outer part of the passage when open, with the first components defining an inner part of the passage. The first components may have concave upper and lower surfaces.

The underside of the second components, at least at an outer part thereof, may be concave.

The degree of concavity of the second components may be greater than that of the first components.

A substantially vertical downwardly facing slot may be provided in the first components towards the external side thereof, which slot is slidingly locatable over a formation on a respective second component, such that when the slot is fully located over the formation the passage is fully open, and as the first components are moved relative to the second components the slot is moved off the formation causing closing of the respective passage.

The slots may each extend vertically for between 40 and 70mm, and more particularly 50 and 60mm. * * *.S.

The formation on the second components may be in the form of an *.***.

* 25 upwardly extending flange provided on the inner edge of the second component. * S..

The ventilation arrangement may be substantially polygonal in plan view, with first and second components for each side of the polygon. The ventilation arrangement may be substantially rectangular in plan view.

The movable first components may be interconnected so as to be simultaneously movable, and link members may interconnect the first components. A respective one of a plurality of link members may interconnect respective ends of the first components.

The link members may be interconnected, and may all be connected to an actuator member.

An embodiment of the present invention will now be described by way of example only and with reference to the accompanying drawings, in which:-Fig. 1 is a diagrammatic perspective view of part of a ventilation arrangement according to the invention; Fig. 2 is a diagrammatic cross sectional view of part of the arrangement of Fig. 1 in an open condition; Fig. 3 is a similar view to Fig. 2 but in a closed condition; and Fig. 4 is a diagrammatic cross sectional view of part of the interior of the part of the ventilation arrangement of Fig. 1.

Fig. 1 shows the exterior of a housing 10 of a ventilation arrangement e which housing 10 is mountable on the roof of a building. Within the housing 10 is a duct which extends downwardly to transport air to and from the interior : of the building.

The housing 10 is substantially square in plan view, with a louvre ::::; arrangement 12 on each side of the arrangement 10. The louvre * 30 arrangement 12 is intended to receive air on a windward side of the housing to enter the duct 18, and to expel air received through the duct 18 on the opposite leeward side, This invention relates to the louvre arrangement 12 which will now be considered in more detail. The size of the arrangement 12 can be determined by a particular situation, but likely dimensional ranges are included below.

Each louvre arrangement 12 defines a plurality of passages 14 on the respective side of the housing 10, which passages 14 are selectively partially or wholly closable. Each louvre arrangement 12 comprises a plurality of spaced static second louvre components 16 on an external side of the louvre arrangement 12, and a plurality of spaced movable first louvre components 18 on an interior side thereof.

The second louvre components have on an internal side an upstanding vertical flange 20 extending for between 40 and 70mm. Extending downwardly and outwardly for a horizontal distance of between 35 and 60mm from the flange 20 is a web 22, which interconnects to a further downwardly extending vertical flange 24, which flange 24 extends for between 25 and 50mm. The inner face of the flange 24 and an outer part of the web 22 is profiled to define a concave surface 26 with a radius of between 30 and 50mm, to urge air passing thereby to turn inwardly and downwardly.

The first movable louvre components 18 are in the form of mouldings with concave upper and lower faces 28, 30, with a slightly greater degree of concavity on the upper faces 28, and respective radii in the ranges 35 to 45mm and 55 to 65mm. A downwardly facing slot 32 is provided adjacent the *.....

* 25 external edge of the first components 18, and is of a size to slidingly fit over -the flange 20 of the-second components The first moveable components -18 have a height of between 40 and 70mm, and a depth of between 35 and 60mm. * . S... S. *

*: 30 The first movable components 18 are interconnected by linkage bars 34 at their respective ends. Fig. 4 shows two such linkage bars 34 attached to the first components 18, though in Fig. 4 the first and second components 18, 16 have been shown diagrammatically and not with their full profile. The linkage bars 34 are all interconnected by cross bars 36 one of which is shown in Fig. 4, and the cross bars 36 are attached to an actuator member (not shown) for actuation. The actuation may be provided manually, or by an electric motor or an actuator, and automatic operation thereof may be provided.

In use in a fully opened condition as shown in Fig. 2, air as shown by the arrows 38 will enter the passages 14 which have an opening of between 30 and 70mm, substantially parallel to the webs 22 but turn upwardly upon encountering the external faces of the first louvre components 18. The air is then guided inwardly and downwardly by the concave surfaces 26. As the air moves further in it is also directed downwardly by the lower faces 30 on the first louvre components 18, whilst also being accelerated by virtue of the decreasing gap caused by the concave upper faces 28.

The right hand most arrow 38 shows the air entering into the interior of the ventilation arrangement 10 substantially horizontally, as opposed to in the direction of the outer part of the passage defined by the web 22, which would generally be at an upwards inclination of between 20 and 40°.

If it is required to partially or wholly close the passages 14, for instance in the event of inclement weather, the first louvre components 18 can be **ss moved upwardly such that the slot 32 moves off the vertical flange 20, and the components 18 can be moved to a fully closed position as shown in Fig. 3.

There is thus described a ventilation arrangement which provides for an improved passage of air thereinto, with turning of the air downwardly as it . : enters the arrangement to provide increased efficiency. There is also * 30 described a louvre arrangement permitting partial or complete closing as required.

Various modifications may be made without departing from the scope of the invention. For instance the louvre arrangements may have different profiles. The movable louvre components may be interconnected and/or movable in a different manner. The movable static louvre components may engage with each other in a different manner.

Whilst endeavouring in the foregoing specification to draw attention to those features of the invention believed to be of particular importance it should be understood that the Applicant claims protection in respect of any patentable feature or combination of features hereinbefore referred to and/or shown In the drawings whether or not particular emphasis has been placed thereon. *..S * * **** *

****** * * S. * S * SI.

S *

I * S.. * . **.

I * S

I IS

Claims

Claims 1. A ventilation arrangement for ventilating a building interior, the ventilation arrangement comprising: an air duct which extends in use from roof level into an interior of the building to be ventilated to convey air between the exterior and interior of the building; ventilation openings which extend around an upper part of the air duct to direct moving air caused by wind movement into or out of the air duct; the ventilation openings having a louvre configuration defining a plurality of discrete openings, one above each other; the louvre configuration being configured such that each opening is defined by a passage extending from the exterior into the ventilation arrangement; the passage extending generally upwardly inwards to avoid the ingression of liquids and other precipitation; with an upper surface of the passage being concavely curved to urge downwardly air entering through the passage.
2. A ventilation arrangement according to claim 1, in which the passage extends upwardly, and at an inclination of between 20 and 40°.
3. A ventilation arrangement according to claims 1 or 2, in which the upper surface of an inner part of the passage is concavely curved.
4. A ventilation arrangement according to claim 3, in which the upper surface of the inner part of the passage extends inwardly for a distance of between 35 and 60mm.
5. A ventilation arrangement according to claim 4, in which the upper surface of the inner part of the passage extends inwardly for a distance of between 40 and 50mm.
6. A ventilation arrangement according to any of claims 3 to 5, in which the curved upper surface of the inner part of the passage has a radius of between and 65mm.
7. A ventilation arrangement according to any of the preceding claims, in which the upper surface of an outer part of the passage is concavely curved.
8. A ventilation arrangement according to claim 7, in which the upper surface of the outer part of the passage extends inwardly for a distance of between 35 and 60mm.
9. A ventilation arrangement according to claim 8, in which the upper surface of the outer part of the passage extends inwardly for a distance of between 40 and 50mm.
10. A ventilation arrangement according to any of claims 7 to 9, in which the curved upper surface of the outer part of the passage has a radius of between 3Oand50mm.
11. A ventilation arrangement according to any of claims 7 to 10, in which the curved upper surface of the outer part of the passage has a radius of between and 45mm.
12. A ventilation arrangement according to any of claims 7 to 11, in which the outermost part of the upper surface of the outer part of the passage extends substantially vertically.
13. A ventilation arrangement according to any of the preceding claims, in which the lower surface of an inner part of the passage is concavely curved to accelerate air entering through the passage.
14. A ventilation arrangement according to claim 13, in which the lower surface of the inner part of the passage has a radius of between 35 and 45mm.
15. A ventilation arrangement according to any of the preceding claims, in which the mouth of the ventilation opening is between 30 and 70mm wide.
16. A ventilation arrangement according to claim 15, in which the mouth of the ventilation opening is between 40 and 60mm wide.
17. A ventilation arrangement according to claim 16, in which the mouth of the ventilation opening may be between 45 and 55mm wide.
18. A ventilation arrangement according to any of the preceding claims, in which the louvre configuration is active so as to selectively partially or wholly close the passages.
19. A ventilation arrangement according to claim 18, in which the louvre configuration comprises a plurality of movable first components and static second components, with the first components being simultaneously movable with each other, with each passage being defined between a respective pair of first components and a respective pair of second components.
20. A ventilation arrangement according to claim 19, in which the first components are moveable over a distance of 40 and 70mm between fully open and fully close positions.
21. A ventilation arrangement according to claim 20, in which the first components are moveable over a distance of 50 and 60mm between fully open and fully close positions.
22. A ventilation arrangement according to any of claims 19 to 21, in which the first components each extend vertically for between 40 and 70mm.
23. A ventilation arrangement according to claim 22, in which the first components each extend vertically for between 50 and 60mm.
24. A ventilation arrangement according to any of claims 19 to 23, in which the second components define an outer part of the passage when open, with the first components defining an inner part of the passage.
25. A ventilation arrangement according to any of claims 19 to 24, in which the first components have concave upper and lower surfaces.
26. A ventilation arrangement according to any of claims 19 to 25, in which the underside of the second components, at least at an outer part thereof, is concave.
27. A ventilation arrangement according to claim 26 when dependent on claim 25, in which the degree of concavity of the second components is greater than that of the first components.
28. A ventilation arrangement according to any of claims 19 to 27, in which a substantially vertical downwardly facing slot is provided in the first components towards the external side thereof, which slot is slidingly locatable over a formation on a respective second component, such that when the slot is fully located over the formation the passage is fully open, and as the first components are moved relative to the second components the slot is moved off the formation causing closing of the respective passage.
29. A ventilation arrangement according to claim 28, in which the slots each extend vertically for between 40 and 70mm.
30. A ventilation arrangement according to claim 29, in which the slots each extend vertically for between 50 and 60mm.
31. A ventilation arrangement according to any of claims 28 to 30, in which the formation on the second components is in the form of an upwardly extending flange provided on the inner edge of the second component.
32. A ventilation arrangement according to any of claims 19 to 31, in which the ventilation arrangement is substantially polygonal in plan view, with first and second components for each side of the polygon.
33. A ventilation arrangement according to claim 32, in which the ventilation arrangement is substantially rectangular in plan view.
34. A ventilation arrangement according to any of claims 19 to 33, in which the movable first components are interconnected so as to be simultaneously movable.
35. A ventilation arrangement according to claim 34, in which link members interconnect the first components.
36. A ventilation arrangement according to claim 35, in which a respective one of a plurality of link members interconnect respective ends of the first components.
37. A ventilation arrangement according to claims 35 or 36, in which the link members are interconnected.
38. A ventilation arrangement according to claim 37, in which the link members are all connected to an actuator member.
39. A ventilation arrangement substantially as hereinbefore described, and with reference to the drawings.
40. Any novel subject matter or combination including novel subject matter disclosed herein, whether or not within the scope of or relating to the same invention as any of the preceding claims.