The invention is related to a thermally insulated daylight ventilation system that is provided with a transparent insulation assembly comprising an insulation body that is permeable for a gas on basis of a transparent material such as glass and/or plastic adapted to be placed in a roof.

The invention is also related to a daylight ventilation system comprising at least an surrounding air permeable insulation body of transparent material wherein the permeability of surrounding air and/or gasses flows mainly parallel to the direction of flow of the conduction heat in the insulation body in vertical or horizontal direction through the transparent insulation body, wherein the conduction heat is blocked by the flowing air and wherein the flowing air with the conduction heat is heated. The invention is further related to a method for using such a system.

Daylight systems are being used for obtaining natural daylight in living and work spaces. These daylight systems are for example light domes and other transparent daylight systems. Daylight systems based on domes and frames made for example from polycarbonate, PMMA, PVC, Polyester, metal, aluminum, glass and/or the combination of these materials are used to achieve thermal insulation values in the range from U = 0.5 W/m ² K to U= 2.2 W/m ² K.

In the American patent US2018329188A1 daylight is provided in the space under the daylight system through reflection under various angles. A downside of such a system is that the insulation value is limited to the range from U = 0.5 W/m ² K to U= 2.2 W/m ² K.

The combination of transparency and ventilation in a daylight system is known from the American patent US2885948A. Use is made of a mechanical ventilator that may transport used polluted air from the inner space to the outside. A downside of such a combination is that only polluted air may be transported to the outside. Only used air is transported using a ventilator to the outside (open air).

In daylight systems wherein outside air is transported to an inner space, for example such as disclosed in W09421871A1 , use is made of smart air inlets so that wind does not influence the ventilation flow. A roster or so called air inlet is used to allow for natural ventilation.

Conventional systems may often be (partially) opened using hinge systems to allow for natural ventilation. Warm air leaves the inner space fast and easy.

The downside of these natural ventilation systems is that both the ingoing and outgoing ventilation air is not conditioned and thus that too warm or too cold air is being used in ventilation which is disadvantageous for the energy consumption for cooling and heating of an inner space. Such ventilation systems allow the supply of air from the surrounding space, in general the outside air, to the inner space, and the transport of air from the inner space to the surrounding space. For maintaining a temperature difference with the surroundings energy is needed to compensate ventilation losses - in other words, the flux of warmth and cold from the space to the surroundings by the inflowing and outflowing of ventilation air.

The loss of energy due to conventional mechanical and natural ventilation notwithstanding air exchange is necessary for a healthy environment. By ventilating it is ensured that the necessary oxygen is supplied and carbon dioxide, hydrogen and unpleasant odors and dust particles are removed. Air exchange also plays a part in removing harmful substances that are possible present in the inner air as a result of for example formaldehyde-emission and radon radiation. The required rate of air exchange of a living area of living space is determined based on the area, in case of utility functions the required rate of air exchange is determined based on the number of persons for which the space is constructed (person approximation).

Too much uncontrolled ventilation costs energy and is often experienced as unpleasant for example when too much cold air is circulated. This may give rise to the impulse to close the ventilation openings thus degrading the air quality.

Additionally these aforementioned daylight systems have a relatively bad insulation index in relation to the roof construction wherein they are placed. Daylight systems that are currently available in the market have thermal insulation values ranging from U=0.5 W/m ² K to U = 2.2 W/m ² K. These daylight systems are placed in roofs wherein the roof and roof covering construction are required to have a thermal insulation value of U = 0.16 W/m ² K and thus form a strong cold bridge, in other words a thermal leak in the complete roof construction.

The invention aims to provide an insulated daylight ventilation system that has extremely high insulation values varying from (R-value) 6 m ² k/W to > 12 m ² K/W which agrees with U = 0.16 W/m ² K to < 0.083 W/m ² K. The invention further aims to bring fresh clean conditioned air into the inner space with a minimal temperature difference with respect to the temperature in the inner space of for example a difference of 1 to 2 degrees Celsius. In addition the invention aims to allow daylight into the inner spaces. This in such a way that the daylight system of the invention applicable is in modern high efficiency insulated (roof) surfaces and such that it does not form a cold bridge in the construction. The system thus fits into modern construction methods for energy neutral and energy efficient buildings.

This goal is achieved by an insulated daylight ventilation system according to claim 1 .

The invention provides an open transparent horizontally oriented honeycomb shaped body in the daylight system constructed from plastic, preferably a plastic polymer such as PET wherein relative to the part wherein the daylight system is provided air and/or gas may flow in a laminar manner through this honeycomb shaped body so that little thermal turbulence is present and so that this honeycomb shaped body is also transparent, while the four sides of the core connect to the dome frames of the daylight system. The frames may be provided hollow to diminish cold bridges in the frames and may also be provided with an inner cavity, an outer cavity and a permeable insulation body.

Similar permeable insulation bodies are described in NL1042468 of the same applicant and make use of super adiabatic flow, wherein the component of the flow rate in the direction of the heat conduction flow is greater than the speed of the conduction heat (diffusion) so that the conduction heat to the outside is blocked and the air flow is heated with the conduction heat. The present invention specifically deals with the horizontal orientation of the insulation body related to a cheaper construction and an improved operation. A problem related to the horizontal orientation is that the temperature gradient is oriented against gravity and that there is strong thermal turbulence, which according to experiments can be suppressed with a honeycomb or permeable body with hollow channels with a cell diameter of 3-5 mm. Such transparent honeycombs and/or cylindrical that are available are costly. For the present invention the honeycomb shaped body surpresses the turbulent flow, which hardly burdens the honeycomb body. The honeycomb shaped bodies may therefor by constructed from an extremely thin material, that possibly is placed loose in the daylight system. Several embodiments of the present invention allow cost efficient construction and assembly systems, which are suitable for commercial application of high-quality ventilating and well insulating daylight systems.

In an embodiment the daylight system is placed in a flat or slightly sloping roof of an inner space of a building, where the inner climate is controlled and in the daylight ventilation system is located a permeable transparent ventilation assembly. The assembly has a chamber with an upper wall, for example a window, which is transparent, a lower wall, for example a window, which is also transparent, and a peripheral wall, which is formed by the inner peripheral wall of for example the dome frame of the insulated daylight ventilation system. In the chamber a permeable transparent insulation body is provided, which partitions the chamber in an upper cavity and a lower cavity. In the dome frame is located a distribution channel, which is delimited by a second upper wall, second lower wall, inner peripheral wall and outer peripheral wall. In the second upper wall is located at least an outer opening for example with an air filter, where with help of a ventilator fresh outside air is blown to the inside. In addition upper openings are distributed over and in the inner peripheral wall, where the air is distributed over the distribution channel to the upper cavity of the permeable transparent insulation assembly. Above, below or below and above the transparent permeable insulation body is provided a transparent permeable film with perforations that preferably have a diameter of 0.1 to 1 mm and that have at least 4 perforations per cm ² , which distributes the flow over the insulation body. For a good distribution the flow resistance over the insulation body is 15 times bigger than in the cavities and the perforated film(s) is (are) air-tight connected to the inner peripheral wall. The air flows subsequently through the lower openings in the lower wall to the inner space. The air flows in the insulation body mainly against the heat conducting flow, which is blocked by a Pe number greater than 0, preferably greater than 3, wherein an R-value of 7-12 Km ² /W is realized, while the fresh air, which flows through the insulation body, is heated by the blocked conducting heat. The horizontally placed insulating daylight ventilation system may be disrupted by the wind speed and the wind direction of the outside air, which is prevented by a second embodiment of the present invention.

To achieve this a space in the dome frame is partitioned in two spaces with a partitioner. In and over the outer peripheral wall in the upper space are distributed outer openings, which are connected with the outside air and form a collecting channel. At least one opening is provided in the partitioning wall, which connects the lower and upper spaces with each other. A ventilator and/or air filters are provided in this opening.

The outer air may flow in four wind directions distributed by the outer openings to the upper air-tight space, where the pressure of the wind on the outer openings in the wind direction is compensated by the wake of the wind on the outer openings on the lee side, so that the pressure in the upper air-tight space is independent from the wind direction and the wind speed, so that the ventilation is minimally disrupted.

Subsequently, the air flows distributed in the lower space, which functions as a distribution channel, to the transparent permeable insulation assembly and then to the lower openings of this assembly to the inner space. The air in the insulation body flows mainly against the heat conduction flow, which is being blocked with a Pe number greater than 0 and preferably greater than 3, wherein a R-value of 7-12 Km ² /W is realized, while the fresh air, which flows through the insulation body, is heated by the conduction heat.

In a third embodiment of the present invention is provided, to reduce heat loss in the dome frame, in the lower space, which is located in the dome frame, a non-transparent insulation assembly, which is air-connected with the inner peripheral wall and the second lower wall and which partitions the lower air-tight space in an inner cavity and an outer cavity, wherein a part of the air may flow from the intermediate opening in the intermediate wall via the outer cavity to the upper openings in the peripheral wall, from where it may flow through the transparent insulation assembly to the inner space, while the remaining part flows through the non-transparent insulation body to the outer cavity, from where it may also flow through the second inner openings in the second lower wall to the inner space.

The air flows mainly against the heat conduction flow in both insulation bodies, which is being blocked with a Pe-number greater than 0 and preferably greater than 3, wherein a R-value of 7-12 Km ² /W is being realized, while the fresh air, which flows through both insulation bodies, is being heated by the conduction heat.

A correct distribution of the flow through the non-transparent and transparent insulation body, is realized by the choice of the respective openings, insulation bodies and perforated film(s). In a fourth embodiment of the present invention is, to reduce costs, the transparent lower wall perforated, so that the perforated film, the lower cavity and the inner openings in or adjacent to the lower wall are not present, and so that the permeable insulation body with an even lower weight is being supported evenly, so that the insulation body may be constructed from an even cheaper and thinner walled and better transparent material.

In a fifth embodiment the permeable insulation body is constructed of adjacent corrugate film plates with corrugate heights of for example 3 mm, which may be placed loose on the perforated film of the lower wall, by first filling a mold in a zigzag manner from a compact role of corrugate film until the complete mold is full and the corrugates, similar to a honeycomb, form channels, and thus forms a permeable insulation body. To prevent the channels to be closed by the nesting of adjacent corrugates, is the lower and upper side of the film provided with straps, which are connected to the crests and valleys of the corrugates by spot gluing or spot welding. These straps fix the corrugate shape of the corrugate films stronger and they may not be nested. This embodiment thus has the advantage that the formed permeable insulation body may be constructed easier in a mold in the right shape and the construction is cheap.

In a sixth embodiment of the present invention the corrugate is placed under an inclination relative to the perpendicular of the edge of the corrugate plate, so that while stacking of the plate the crests of one plate always at least makes contact with the valleys of the adjacent plate, so that it is not possible, due to the shape, that the corrugates are nested and thus that the channels are closed. They may be placed loose on the perforated film of the lower wall of the transparent insulation assembly with corrugate heights of for example 3 mm, by first filling a mold in a zigzag manner from a compact role of corrugate film until the complete mold is full and the corrugates, similar to a honeycomb, form channels, and thus forms a permeable insulation body.

In a seventh embodiment the corrugate plates or pleat plates are constructed from thin walled film by pleating the corrugates, wherein the pleats at the top and at the body are connected to each other, for example by point welding or point gluing. Since the pleats may be closed the corrugates are not allowed to nest and the pleat plate of the insulation body may be constructed easily in a mold and then being placed in the daylight system.

In an eight embodiment the insulation body is made foldable to allow to improve the view to the outside and to allow, during summer, to protect the insulation body against UV light. The corrugate plates, which must fill the insulation body are, in folded condition, nested with a thickness n times the number of plates times the thickness of the film, from which the corrugate plate is constructed. Preferably the corrugate plate of the fifth embodiment of the present invention is used, in this case however the reinforcing straps are replaced by reinforcing threads, which, to allow nesting, are translated near the crests of the corrugate plate by a thread thickness relative to the reinforcing threads near the valleys of the corrupt plates. To be able to unfold the plates are provided in a frame, which has the dimensions of the desired insulation body. The first corrugate plate is fixed to for example the back wall of the frame. The opposite front corrugate plate is fixed to a pull bar, which is connected near the ends to the pull chords, which, in this example, allow it to be pulled to and from the front wall. The frame is closed with a for example left wall and right wall. The adjacent corrugate plates have alternately an extra half corrugate length to the right side, called right plate from now on, and to the left side an extra half corrugate length, called a left plate from now on. For example, in the frame next to the left plate is located an extra left wall, which may move with half a corrugate length with a servomechanism to the left and to the right and vice versa. For example, the left plates are provided with spacer chords to the back wall and to each other, so that they, during unfolding, are located on two corrugate lengths from each other. After unfolding with the pull chords, in this example, the corrugate plates are in phase adjacent to each other. By pushing the left plates with the moving left side wall half a corrugate length to the right, the crests of the left plates are located beneath the valleys of the right plates, so that, just as in a honeycomb, channels are formed, which thus form a permeable insulation body.

The body may be folded again in reverse order, by moving the moveable left wall to the left and the left plates, possibly aided by elastic flaps, which are located to the right of the plates and which push against the right wall and thus push the left plates to the left. The pull chords than pull the corrugate plates back in folded position, wherein the corrugate plates are nested. The required number of corrugate plates and the length are determined by the dimensions of the desired insulation body and the corrugate heights of the corrugate plates.

Because the goal is to suppress turbulence, with a characteristic length of 5 mm inaccuracies of 1 mm are not important and the distance between the crests of one corrugate plate and the valleys of another corrugate plate may be determined to 1 mm accuracy and the left plate shall to improve nesting during unfolding in this example be moved 1 mm less than the half corrugate length to the right. The corrugate length is preferably between 6 and 10 mm, so that in this case the left plates have to be moved 2 to 4 mm.

Depending on the position of the mold of the insulation body the front wall and back wall may also be left wall and right wall etc.

The invention will further be illustrated by the 17 drawings wherein: fig. 1 shows a perspective view of a first embodiment of an insulated daylight ventilation system according to the invention; fig. 2 shows an intersection view of a first embodiment of an insulated daylight ventilation system according to the invention; fig. 3 shows an intersection view of a second embodiment of an insulated daylight ventilation system; fig. 4 shows an intersection view of a third embodiment of an insulated daylight ventilation system; fig. 5 shows an intersection view of a fourth embodiment of an insulated daylight ventilation system; fig. 6 shows a view of a detail of a fifth embodiment of an insulated daylight ventilation system; fig. 7 shows a view of a detail of a sixth embodiment of an insulated daylight ventilation system; fig. 8 shows a view of a detail of a seventh embodiment of an insulated daylight ventilation system; fig. 9 shows a view of a detail of a eighth embodiment of an insulated daylight ventilation system; fig. 10 shows a view of a detail of a eighth embodiment of an insulated daylight ventilation system; fig. 1 1 shows a top view of a detail of an eighth embodiment of an insulated daylight ventilation system; fig. 12 shows a side view of a detail of an eighth embodiment of an insulated daylight ventilation system; fig. 13 shows a side view of a detail of an eighth embodiment of an insulated daylight ventilation system; fig. 14 shows a top view of a detail of an eighth embodiment of an insulated daylight ventilation system; fig. 15 shows a top view of a detail of an eighth embodiment of an insulated daylight ventilation system; fig. 16 shows a top view of a detail of an eighth embodiment of an insulated daylight ventilation system; fig. 17 shows a top view of a detail of an eighth embodiment of an insulated daylight ventilation system;

Fig. 1 shows a perspective view of a first embodiment of an insulated daylight ventilation system. The figure shows a few details globally to show where the various components, shown in figures 2 to 5 are located.

The in fig. 1 shown insulated daylight ventilation system 20 with a permeable insulation assembly 14 is used for allowing daylight and conditioned clean outside air to enter with a high insulation value. The insulated daylight ventilation system 20 is placed in flat and slightly sloping roofs 16. At least an outer opening 31 in the dome frame 2 connects a peripheral distribution channel 25 in the dome frame 2, with the outside air. This distribution channel 25 is also connected to a permeable insulation assembly 14 by upper openings 3, which are distributed evenly in the inner peripheral wall 19. For example fresh outside air is blown into the distribution channel 25 by at least one ventilator 1 , which is connected to the outer opening, and then distributed via the upper openings 3 to the transparent permeable insulation assembly 14, from where it flows through the inner openings 5 to the inner space 17. In the insulation assembly 14 air flows mainly against the heat conduction flow, which is than blocked by a Pe number greater than 0 and preferably greater than 3, wherein an R-value of 7-12 Km ² /W is realized, while the fresh air, which flows through the insulation assembly 4, is heated by the blocked conduction heat. Further details are shown in the more detailed intersection in figure 2.

Fig. 2 shows a schematic intersection of a first embodiment of the present invention. In the daylight ventilation system 20, that is placed in a roof 16 of an inner space 17 of a building, a permeable transparent ventilation assembly 14 is provided. The assembly 14 comprises a chamber 18 with an upper wall 3, which is transparent, a lower wall 7, which is also transparent, and an inner peripheral wall 19, which is formed by the inner peripheral wall 19 of the dome frame 2 of the insulated daylight ventilation system 20. In the chamber 18 a permeable transparent insulation body 4 is placed, which partitions the chamber 18 in an upper cavity 8 and a lower cavity 10. In the dome frame 2 a second gas-tight chamber 21 is located, with a second upper wall 22, a second lower wall 23, an inner peripheral wall 19 and an outer peripheral wall 24. In the second upper wall 2 an outer opening 25 with an air filter 13 is located, allowing with help of a ventilator 1 fresh outside air to be blown to the inside.

In addition upper openings 3 are distributed over the inner peripheral wall 19, where through the air is transported to the upper cavity 8 of the permeable transparent ventilation assembly 14. The air flows through the insulation body 4 to the lower cavity 10, where it may flow through the lower openings 5 to the inner space 17. The flow of the air is depicted by flow lines 12 in the shape of a dashed line or, if it is located behind the wall, a dashed striped line. Above, below or below and above the transparent permeable insulation body 4 a perforated film 9 is provided with perforations with preferably a diameter of 0,1 to 1 mm and with at least 4 perforations per cm ² , which distributes the flow the insulation body 4. For a good distribution the flow resistance over the insulation body 4 and the perforated film 9 is fifteen times higher than in the cavities 8 and 10 and is (are) the perforated film(s) connected air-tight to the inner peripheral wall 19. In the insulation body 4 the air flows mainly against the heat conduction flow, which is blocked by a Pe number greater than 0 and preferably greater than 3, wherein an R-value of 7-12 Km ² /W is realized while the fresh air, which flows through the insulation body 4 is heated by the blocked conduction heat.

In fig. 3 components corresponding to figs. 1 and 2 are provided with the same reference numerals.

Fig. 3 shows again an insulated daylight ventilation system 20 with an insulation assembly 14 in the airtight space 18 in the inner peripheral wall 19 of the frame 2 of the insulated daylight ventilation system 20.

This system 20 is an air inflow system that is wind direction insensitive provided in the second air-tight space 21 , by partitioning the air-tight space 21 in the dome frame 2 in to spaces separated by an intermediate wall 29. In the upper space 30 outside openings 31 are distributed in and over the outer peripheral wall 24. In the intermediate wall 29 at least an intermediate opening 32 is provided, which connects the lower space 33 and the upper space 30. At least one ventilator 1 and/or air filters 13 is placed in this intermediate opening 32. The outside air flows in four wind directions distributed through the outer openings 31 to the upper airtight space 30, where the pressure of the wind op the outer openings 31 in the wind direction is compensated by the wake of the wind on the outer openings 31 on the lee side, such that the pressure in the upper air-tight space 30 is independent on the wind direction and wind speed, thus minimally disrupting the ventilation.

The air flows than through the upper openings 3 to the upper cavity 8 of the transparent insulation assembly 14, through the transparent insulation body 4 to the lower cavity 10 and then through the lower openings 5 to the inner space 17. The air flows mainly against the heat conductivity flow in the insulation body 4, which is blocked by a Pe number greater than 0 and preferably greater than 3, wherein an R-value of 7-12 Km ² /W is realized, while the fresh air, which flows through the insulation body 4 is heated by the conduction heat.

In fig. 4 components corresponding to figs. 1 -3 are provided with the same reference numerals. Fig. 4 shows again an insulated daylight ventilation system 20 with an insulation assembly 14 in the air-tight space 18 within the inner peripheral wall 19 of the dome frame 2.

In the system 20, for improving the insulation of the dome frame 2 in the lower space 33, a nontransparent permeable insulation body 28 is provided, such as for example porous rock wool, which partitions the lower space 33 in an inner cavity 34 and an outer cavity 35. The outer cavity 35 is connected with the upper space through the intermediate opening 32 in the intermediate wall. The outer cavity 35 is also connected to the user cavity 8 of the transparent insulation assembly through the upper openings 3, thus distributing the flow in the transparent assembly 14 and the non-transparent assembly 15. The inner cavity 34 of the non-transparent assembly 15 is connected with the inner space 17 through the inner openings 36 in the second lower wall 23.

In both insulation bodies 4 and 28 air flows mainly against the heat conduction flow, which is blocked with a Pe number greater than 0 and preferably greater than 3, wherein an R-value of 7-12 Km ² /W is realized, while the fresh air, which flows through both insulation bodies, is heated by the blocked conduction heat.

The correct distribution of the flow through the non-transparent assembly 15 and the transparent assembly 14, is realized through the choice of respective openings 3, 5, 36, insulation bodies 4, 28 and perforated film(s) 9 or lower wall 7.

In fig. 5 components corresponding to figs. 1 -4 are provided with the same reference numerals. Fig. 5 shows again an insulated daylight ventilation system 20 with insulation assembly 14 in the air-tight space 18 in the dome frame 2 of the insulated daylight ventilation system 20. The perforated film 9 is in fig. 5 removed and the transparent lower wall 7 is replaced by the perforated transparent lower wall 7, made from a stiff transparent perforated plate for example constructed from Perspex or multi walled polycarbonate.

The transparent permeable insulation assembly 14 is not provided with a lower cavity 8 in this case, while the insulation both 4 is supported over the entire surface, the system thus may be constructed cheaply.

In fig. 6 components corresponding to figs. 1 -5 are provided with the same reference numerals. Fig. 6 shows a detail of a view of a fifth embodiment of the transparent insulation body 4 of the insulated daylight ventilation system 20.

The insulation body is formed from a thin flexible transparent continuing small corrugate plate 37, wherein the corrugates are not completely perpendicular to the edge 38 of the plate. The width of the corrugated plate corresponds with the height of the insulation body 4 which is to be formed and is deposited in a zigzag manner in a not-shown mold, which has the dimensions of the desired insulation body 4, until the mold is full and then it is fixed by point gluing or point welding, such that it may be placed in its entirety in the daylight ventilation system 20.

Because the corrugations are slightly inclined they cannot be nested and thus honeycomb like cells are created in the insulation body 4, which than realizes the desired flow with low turbulence in the transparent insulation assembly 14.

In fig. 7 components corresponding to figs. 1 -6 are provided with the same reference numerals. Fig. 7 shows a front view of a detail of a sixth embodiment of the transparent insulation body 4 of the insulated daylight ventilation system 20.

The insulation body 4 is formed from a thin flexible transparent continuing small pleat plate 37, wherein the pleats 39 are perpendicular to the edge 38 of the plate. The pleat plate, made from transparent, for example thin, plastic film is prefabricated in a pleat machine and is fixed with point glue or point weld connections. The width of the pleat plate 37 corresponds to the height of the insulation body 4 and is deposited in a zigzag manner in a not-shown mold, which has the dimensions of the desired insulation body 4, until the mold is full and then is tied with point weld or point glue connections, so that it may be placed in its entirety in the daylight ventilation system 20.

Because the pleats are closed, they are not allowed to be nested and thus honeycomb like cells are created in the insulation package, which may realize the desired flow with little turbulence through the permeable insulation body 4. In fig. 8 components corresponding to figs. 1 -7 are provided with the same reference numerals. Fig. 8 shows a front view of a detail of an eighth embodiment of the transparent insulation body 4 of the insulation daylight ventilation system 20.

The insulation body is hereby formed from a thin reinforced transparent small corrugate plate 37, wherein the corrugates are perpendicular to the edge 38 of the plate 37. The corrugate plate 37, made from transparent for example thin plastic film, is provided with straps or threads 40 for reinforcement, which are point welded or glued to the crests and valleys of the corrugates. The width of the corrugate plates 37 corresponds to the height of the insulation boy 4 and they have a length, which corresponds for example the width of the insulation body 4. The plates 37 are than alternately stacked in a mold with the desired dimensions of the desired insulation package, such that the crests of one plate are placed on the valleys of the next plate, until the mold is full and then they are fixed further with point weld or point glue connections such that it may be placed in its entirety in the daylight ventilation system.

Because the straps 40 close the plates 37 they are not allowed to be nested and thus honeycomb like cells are created in the insulation body 4, which may realize the desired flow with little turbulence through the permeable insulation body 4.

In figs. 9-17 components corresponding to figs. 1 -8 are provided with the same reference numerals. Figs 9-17 show views of details of a ninth embodiment of a transparent insulation assembly 14 of the insulated daylight ventilation system. The transparent permeable insulation body 4 of the ninth embodiment may, if desired, be folded or unfolded.

The insulation body 4 is thereby formed from the corrugate plates of the eighth embodiment shown in fig. 8, with the differences that alternately stacked a plate to the left has an extra half corrugate and the next plate has an extra half corrugate to the right, or vice versa.

Fig. 9 shows a perspective view of a corrugate plate with to the left in the figure an extra half corrugate length 41 , called a left plate 42 from now on, with reinforcing threads 40.

Fig. 10 shows a perspective view of a corrugate plate with to the right in the figure an extra half corrugate length 43, called a right plate 44 from now on, with reinforcing threads 40.

Fig. 1 1 shows a top view of a detail of a folded right plate 44 and a left plate 42. In the unfolded condition the left plate 42 is moved, as indicated by the dashed arrows 45. The unfolded position of the left plate 42 is shown with dashed lines.

Fig. 12 shows an upper view of a detail of an unfolded right plate 44 and a left plate 42.

Fig. 13 shows a side view of a detail of folded right plates 44 and left plates 42. The reinforcing threads 40 which are connected in this case to the crests 39 of the corrugates are translated with respects to the threads 40 at least by the thickness of the reinforcing threads 40, which in this case are connected to the valleys of the corrugates, such that adjacent corrugate plates 42 and 44 may be nested into each other during folding of the insulation body 4.

Fig. 14 shows a side view of a detail of the unfolded right plates 44 and left plates 42. The corrugate plates are alternately rich plates 44 and left plates 42.

Fig. 15 shows an upper view of a foldable insulation body 4, with alternately folded left plates 42 and right plates 44. In the figure in this case the back corrugate plate is a right plate 44, which in the figure is connected to the back wall 47 of the frame 51 of a folding mechanism 52, which fits in the desired space of the insulation assembly 14. Additionally the frame 51 has in the figure a front wall 48, a moveable left wall 49, a non-moving left wall 57 and a right wall 50. The front corrugate plate in the figure is a left plate 42, which is connected to a pull bar 27, which is connected to the ends with pull chords 53, which in the figure may move from back to front or vice versa. The in the figure front and back left plates 42 are connected to spacing chords 54 and to the back wall 47, such that the left plates 42 in unfolded condition are not separated more than twice the corrugate height of the corrugate plates. The ends of the back left plate 42 are connected with spacing chords 54 to the back wall 47. The moveable left wall 49 may move with half corrugate lengths of the corrugate plates 42 and 44 in this figure to the left and to the right, for example with a servomechanism 55.

Fig. 16 shows a top view of a foldable insulation body 4, with alternately unfolded left plates 42 with in- between right plates 44, because the pull chords 53 have pulled the in the figure front left pate 42 with the pull bar 27 to the front and the remaining spacing chords 54, from which the back chords are connected to the back wall 47, until the front wall 48 is reached. The intermediate right plates 44 are loose between the in this example to the front pulled left plates 42.

Fig. 17 shows a top view of a foldable insulation body 4, with alternately unfolded and to the right moved left plates 42 until the right wall 50 is reached. The left plate 42 are moved to the right by a servomechanism 55 and have moved, in this example, the right plates 44 up with a corrugate height. Thus the valleys of the right plates 44 have come in contact with the crests of the underlying left plates 42 and the valleys of the left plates with the crests of the underlying right plates 44. Thus honeycomb like cells are created in the insulation body 4, which may realize the desired flow with low turbulence through the transparent permeable insulation both 4.

The insulation body 4 may be folded, by in this case moving the moveable left wall 49 to the left with the servomechanism 55, wherein the left plates 42 will move somewhat to the left by the elastic flaps 56, such that the crests of the left plates 42 move passed the valleys of the right plates 44, after which the lower left plate 42 in the figure is moved upwards by the pull chords 53 with the pull bar 27. By this movement the corrugate plates 42 and 44 may be nested again and the insulation body may be folded again. Because the goal is to suppress turbulence, with a characteristic length of 5 mm inaccuracies of 1 mm are not important and the distance between the crests of one corrugate plate and the valleys of another corrugate plate may be determined to 1 mm accuracy and the left plate 42 shall to improve nesting during unfolding in this example be moved 1 mm less than the half corrugate length to the right. The corrugate length is preferably between 6 and 10 mm, so that in this case the left plates 42 have to be moved 2 to 4 mm.