FR2564880A1 - Surface or wall panel made of corrugated sheet metal for providing high thermal protection by dissipating the heat due to solar radiation - Google Patents

Abstract

The surface panels 4 and 5 are flat, hollow, self-cooling and fit into each other. They are obtained by folding (forming) an initially flat metal sheet. A set of closed overlapping channels are produced with cross-sections in the shape of equilateral triangles. The internal folds 3 (ventilation channels) act as "radiators", dissipating the solar heat absorbed by the upper surface 1. The panels are cooled by the accelerated circulation of air, which arises due to the density difference caused by the heat absorbed in the ventilation channels. Cool air is thus drawn in at the base of the panel. The lower, cooled, surface 2 no longer radiates heat to the inside of the dwelling. The device simply and economically solves the problem of protection against heat, whether it forms the main or the auxiliary system, a problem which must be solved in very sunny climates.

Description

 Self-cooling profiled sheet panels (dissipating heat instead of radiating it to their underside)) usable in construction (roofing and thermal protection).

Unlike all other sheets, profiled or not, which radiate the heat received to their upper side by radiation.
Isotôle is a self-cooling plate: its special profile called Isoprofil allows the dissipation of the solar heat received on its upper face and transmitted by conduction inside ventilation channels whose walls act as radiators giving off their calories to the air. The accelerated circulation of the air is natural and automatic: The heated air, lighter while rising, sucks in the fresh outside air continuously ... The underside of the sheet, in the shade, ventilated and cooled in permanence thus remains incomparably cooler than that of normal sheet metal and no longer radiates heat inside the home (Fig. 1)
The corrugated or profiled sheet used for roofing meets the requirements for protection and sealing but has a major drawback due to its very low thermal inertia it heats up almost instantaneously and transmits fully the revised heat and overheats the interior of buildings (by radiation and convection) as long as it receives heat from the sun. It therefore requires very expensive external thermal protection (such as a concrete floor) or interior: attic ventilated by construction of false ceilings completely insulating the interior of the dwelling of overheated air in the attic, resulting in loss of money, space and volume otherwise available.

 In addition, the sheet, corrugated or profiled, is not very aesthetic, has a very low sound insulation power, resonates very strongly under the impact of raindrops and the projecting profiles have a significant wind resistance during the passage typhoons or cyclones.

 The present invention overcomes all these drawbacks by using to its advantage the defects of the sheet without sacrificing any of its advantages.

 The invention relates to the production and industrial manufacture of cover panels of folded sheet, flat, hollow, self-cooling, nestable, very rigid in the longitudinal direction, flexible in the transverse plane, having the characteristic of dissipating the absorbed solar heat. by their upper face instead of transmitting it entirely by radiation to their underside, thus eliminating the major defect in the sheet.

 In addition, the fixing and connection of these panels are completely invisible.

The sound insulation is significantly improved, the level of resonance is significantly reduced.

 Incidentally, these panels allow, as soon as they are installed, the easy installation of ducts, tables, antenna descents, pipes, etc. ... inside the ventilation channels (open inwards) in the longitudinal direction . The exit holes, at any point, will be made without perching by moderate sinking of the edges of the profile by means of a spindle or equivalent non-cutting tool.

 The two faces, exterior and interior, are flat. The external face not only looks good (invisible fixing and connection) but also has no wind resistance.

The interior face, flat and aesthetic, can, at the limit, be simply painted or covered with wallpaper.

 The flatness of the surface offers yet another advantage: the possibility of instant fixing without perching by integral gluing of the entire surface on plywood or chipboard panels with contact adhesive with high adhesion Neoprene (70 kg / cm 2) or any other equivalent or superior product.

 DESCRIPTION: Each panel consists of a sheet of sheet metal (or other metal or heat conducting material) folded at 60 degrees at equal intervals - 2 times to the right, 2 times to the left, 2 times to the right, 2 times to the left , etc ... - dewlap to thus form a series of closed, contiguous, triangular equilateral channels (3) alternately base at the bottom, base at the top) between two flat faces (upper (1) and lower (2)).

 To ensure the watertight connection between two consecutive panels, each lateral end is constituted by one side of the ventilation channel, one rising (5), the other descending (4) a little shorter than the others to take account of the 'thickness of the sheet used and the curvature at the folding point, this to avoid any excess thickness at the point of overlap.

 Bittant given that the folding reduces the width of the panel to a quarter of the width of the flat starting sheet, but that this special folding increases its qualities of rigidity, we can afford to reduce the thickness of the sheet used for manufacturing consequently. , which will only be better both in terms of heat dissipation and the ease of fixing by drilling the underside (2) (screws, nails, rivets, Pop rivets, etc.) the flexibility transverse allowing to (temporarily open the channels which will then close by themselves.

 OPERATION: The heat absorbed by the upper face (1) is transmitted by conduction in the walls (3) (acting as radiators) of the ventilation channels and dissipated by radiation inside the said channels, the sheet metal giving up its calories to the air, which is heated and therefore lighter, rises and evacuates at the top, thus sucking in fresh outside air (from below) which in turn cools the walls of the ventilation channels. The phenomenon is continuous. The panel is therefore cooled without any means other than forced, automatic, natural and continuous ventilation.

 MANUFACTURING: The Isoprofil 4 'd (from Isotôle>) profile is easily obtained industrially and continuously by a first profiling in square slots followed by a progressive compression simultaneously horizontal and vertical (both from bottom to top and on the two sides) gradually transforming the open slots into closed channels of equilateral triangular section.

 It is important to note that profiling in square slots can be carried out on roll forming machines currently in service by simply replacing the rollers or profiling discs.

In addition, the geometrically simple shape of the necessary rollers (smooth cylinders with a height equal to the diameter (or disks) all similar) allows a significant saving on the price of the tooling. To obtain the final profile, all you have to do is add a compression unit at the end of the roll forming machine. This can either be integrated into the roll forming machine (to obtain the panels in a single operation and continuously) or separate. In the first case, compression can be obtained by passing the crenellated sheet between a series of parallel cylinders (face to face two by two) of declining, smooth, horizontal spacing for vertical compression. Simultaneously, lateral compression will be obtained by tightening progressively by passing between two series of tapered rollers - with a height equal to the diameter of the base - on one side at the top, on the other top at the bottom - tapering. The separate compression unit design works on the same principle.

 It is obvious that this final shaping of the panels can be obtained by other means, for example hydraulic, pneumatic, oleo-pneumatic or electric compression of the crenellated sheet in a shape or a mold flat to the dimensions of the panels. Except in special cases, the above solutions seem preferable, however.

 The field of application of the invention is more particularly that of construction and thermal protection in hot climate with strong sunshine, tropical or sub-tropical.

Isotôle panels offering the advantage of not upsetting the habits or the construction techniques in use and of being easily achievable with the production machines already in service by requiring only a small additional investment for the 2nd manufacturing phase (compression).

 It is understood that these panels can also be used as economic thermal protection by being superimposed on an existing roof or construction, in good or bad condition, other types of roofs, terraced slabs or concrete walls exposed to the sun, allowing thus a noticeable improvement in comfort inside buildings or dwellings or (and) a significant energy saving in cases where recourse to air conditioning is absolutely necessary.

Claims (8)

 1 Hollow cover or cladding panels in folded sheet metal offering original thermal protection by dissipating the solar heat absorbed at their upper face (1), characterized in that they do not use any insulating material but use the heat conductivity characteristics of the material used and the large capacity of radiation and heat dissipation (cooling) offered by their profile to function as heat exchangers (ventilation channels 3).  2 panels according to claim 1, characterized in that they are made of any material other than sheet metal.  3 Each panel according to claims 1 and 2, is characterized in that it consists of a thin, flat sheet, folded at 60 degrees, at equal intervals -2 times to the right, 2 times to the left, 2 times to right, 2 times to the left, etc ... - dewlap to form a series of closed channels, (3) contiguous, equilateral triangular (nested:: alternately base down, base up) between two planar faces (upper ( 1) and lower (2)), the first and the last channel being oriented in opposite directions (one base at the bottom, the other base at the top), their outer side (4 and 5) being slightly shorter than that in other channels. 4- The profile used according to claim 3 called Isoprofil> is characterized in that its section is based on equilateral triangles (particular case of an isosceles triangle) allowing - by reference to a feuffleplane - to multiply by 7 the surface radiant (cool) relative to the heat absorbing surface using only three times more raw material.  5 Panel produced according to the preceding claims except that its profile is characterized in that it is based on isosceles and non-equilateral triangles, or double isosceles (case of a square cut by a bitonal) rendering the terms null: < at 60 degrees, at equal intervals of claim 3 where the term: <equilateral must be replaced by: <isosceles> (double isosceles folding> being characterized in that 2 successive folds in opposite directions at 90 degrees are followed by 2 successive folds in opposite directions at 45 degrees and vice versa), all other things remaining similar.  6 All the panels produced according to the preceding claims can be fitted. The connection of the panels is characterized in that it is rainproof, invisible, in that it does not create any additional thickness and in that it requires no means of fixing, the downward side (4) of a edge of panel hanging from the inside on the side (down, (5) of the next and vice versa.  7 The panels produced according to the preceding claims are characterized in that their folding system offers flexibility and transverse elasticity making it possible to temporarily separate the edges of two consecutive channels for the passage of the various fixing means (screws, rivets, etc. ..) or of the tools necessary for their fixing (drills, riveters, screwdrivers, etc.) as well as the installation, at the very moment of fixing of the panels, of any sheaths, antenna descents or pipes which must be embedded therein for this to disrupt its operation, the double folding of the walls of the channels acting as an elastic hinge, the channels closing themselves after being opened.  8 Manufacturing method characterized in that it consists in subjecting a progressive lamination simultaneously horizontal and vertical to a previously crenellated sheet> in square slots by continuous profiling, this to obtain, from a flat sheet, the final profile based on equilateral or isosceles triangles according to the above claims.