NL1023900C2 - Separation and method for controlling the temperature in a room. - Google Patents

Description

Separation and method for controlling the temperature in a room

The present invention relates to a partition for separating two spaces comprising two light-transmitting partition walls spaced at a distance (a) of more than 5 mm, wherein means are provided for moving a liquid between said partition walls, which means comprise liquid draining giving means adapted to provide a liquid film, one of said partition walls being an external partition wall, and the other of said partition walls being an internal partition wall, said liquid film moving over said internal partition wall.

US 4,286,576 A describes a vertically placed panel of a solar collector with two spaced-apart partition walls between which an auxiliary wall is placed. A liquid is introduced into the two spaces thus created. This construction is for storing solar energy and is translucent.

A "solar water heater" is described in European application 022389. That is, in a roof element, two walls are arranged at a small distance from each other and the space in between is completely filled with liquid such as water. Then heat can be generated by solar radiation. There is a space on either side between the walls and the actual roof element.

In horticulture, but also in other structural constructions, there is a problem that an increase in temperature occurs in the space concerned when irradiated with sunlight. It is, of course, possible to eliminate this temperature increase through ventilation on the assumption that the ambient temperature is sufficiently low. However, this creates an open connection with the environment that is not desirable under circumstances. Moreover, it is quite possible that the outside temperature is so high or low that active cooling or heating is necessary.

The object of the present invention is to provide a partition or method with which active cooling or heating is possible and whereby further ventilation or heating can be dispensed with. Moreover, the object of the present invention is to effect cooling / heating in such a way that no or negligible loss of light of any light radiation occurring through the separation occurs.

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Η I

I 2 I

This object is achieved according to the present invention in that between those I

I liquid film and the outer partition wall provide a space-insulating space

I is present. I

According to the present invention, for example, with a sloping panel of I

In the roof construction of a greenhouse, this panel has a double-walled design. As such, this is I

I known. According to the invention, in contrast to the previously known concept

I structures, a liquid film guided along the inner wall. Such a liquid film I

however, has such small dimensions that between the upper surface of the liquid film I

I and the outer wall remains a free space or cavity that has insulating properties

I 10 provides. That is, the effect described above is known from the European approach

Application 022 389 of water heating does not occur in the present invention

I because the water is not in contact with the outer wall. When using water or other I

I crystal clear liquid will in principle transmit the light without substantial loss, that is I

with an efficiency of more than 95% and more in particular with an efficiency of I

I more than 99% are allowed through, so that, caused by solar radiation, I neglect

Unless heating of the water occurs. I

However, because the water flows along the inner wall of the plastic panel, I

The temperature of the inner wall will approach the temperature of the water. Im- I

Iers, such plastic panels are generally thin-walled with I

A wall thickness of less than 3 mm and in particular of less than 1 mm and more in the wall

particularly about 0.2 mm. This wall thickness depends on the material I used

I and for polycarbonate is for example about 0.8 mm and for PMMA about 2 I

Mm. I

Because the wall assumes the temperature of the cool water, an ac is created

I tive cooling of the building. At higher humidity, condensation on the wall that I

that is, heat release. Such condensation on the inside I

The wall can lead to unwanted water droplets. This can be avoided I

Through the inside of a wall of surface tension reducing additives

To provide respectively coating. It is also possible with the help of an I

30 directed circulation along the inside of the panel, drop formation as much as possible I

I counter. Other means to spread condensation as far as possible I

Iars can be used such as vibrators. Due to the presence of the I

I "cavity" above the water layer and an insulating effect is created below the outer wall

I 1023900-3 cavity. As a result of this insulation, the heat absorption of the structural structure will be prevented by the presence of the cooling water flow. Any condensation of space present in the building structure will be limited to a minimum and always occur at the coldest point, that is to say on the inner wall.

To ensure that the water or other liquid, such as glycol, is spread as much as possible over the surface of the inner wall, surface tension reducing agents, such as soaps, can be used. These can be present both in the liquid in question and on the inner wall along which the water flows.

It will be understood that that inner wall does not necessarily have to be arranged inclined.

It can also be vertical.

The liquid used has a preferably relatively low temperature. A temperature between 5 ° C and 12 ° C is mentioned as an example. This makes it possible to absorb and dissipate much heat from the structural construction. The heated water can, for example, be fed back into a heat sink which can for instance be an underground water storage. In the winter this somewhat heated water can be used again for heating the structural structure, either directly or via a heat pump. In the shorter term, such as at night, it is possible to provide for further cooling of the previously used water.

Other constructions with storage vessels, heat pumps and heat exchangers can be envisaged by those skilled in the art and are within the scope of the appended claims.

Dispensing the liquid can be discharged in any way known in the art. According to a special embodiment of the present invention, a series of nozzles are provided along the upper limit of the relevant panel, each of which emits a staggered stream of water. It is also possible to provide continuous delivery with special dispensing hoses or tubes designed for this purpose.

The panels can comprise flat panels, it is also possible to use panels whose outer walls are zigzag-shaped.

The invention also relates to a method for controlling the temperature in a space, which space is provided with a light-transmitting panel consisting of plastic partition walls spaced at least 5 mm, wherein a partition wall forms the boundary with that space and the another partition wall 1023900 "forms the boundary with that environment, wherein a liquid film with a thickness of less than 1 mm I is applied to the partition wall that forms the boundary with the space.

It has been indicated above that the liquid used is in principle crystal clear, that is to say, has no influence on the transmitted light. However, it is possible to provide influence through additions in the liquid and / or coatings on the walls.

Mention is made as an example of additives which influence the wavelength of the light. Particularly when growing crops in greenhouses, it has been found that certain parts of the light spectrum are important and other parts of lesser importance for growth. In addition to influencing the wavelength, it is possible to block certain undesired frequencies. Moreover, since a continuous stream of water moves along the inner wall of the panel, a continuously varying control of the light transmission and / or reflection can be provided. It will also be understood that by adding pigment and other substances and / or providing coatings, in contrast to the above-described absorption of heat can take place.

It is also possible to influence the emergence of light from the architectural structure by introducing additives. In greenhouses, for example, shafts are used to limit light emission at night. This could be replaced by the (temporary) introduction of additives in the liquid. At a later stage, these additives can easily be chemically or physically removed. In addition, it is also possible with these additives to recover the heat that is generated by lighting (assimilation lighting) by absorption. Another possibility at a higher temperature is cooling this heat away with the liquid according to the invention.

By controlling the flow rate and the layer thickness of the water, the heat transfer to the interior of the architectural structure can be controlled. The layer thickness of the liquid stream can also be influenced by additives.

Heat radiation limiting means can also be added to the liquid. This can of course also be realized in the form of a covering on one of the walls.

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Because the water flow is supplied separately at different places, different conditions can be realized at different positions in the architectural construction. With this, certain advantageous situations can be realized.

According to a further advantageous embodiment of the invention, the entire space between the two panels can be temporarily filled with liquid. In such a case, a solar boiler-like construction is created with which heat can be extracted. Full filling results in the effect of cooling at night. The walls and in particular the inner wall can be provided with means for improving the heat transfer. Examples thereof are ribs, black-colored parts and the like.

The invention will be explained in more detail below with reference to an exemplary embodiment shown in the drawing. It shows:

FIG. 1 very schematically an architectural construction;

FIG. 2 shows in detail a part of the roof of the structure; FIG. 3 an example of a panel shown in FIG. 2.

In Fig. 1, 1 denotes an architectural construction such as a greenhouse. The roof or deck is indicated by 2. As is apparent from Fig. 2, this consists of panels 3. Each panel consists of an outer wall 4 and an inner wall 5. The outer wall 4 is then the wall that is in contact with the environment and the inner wall 5 is the wall that is connected to the space. The distance between the walls 4 and 5 is indicated by a and is greater than 5 mm and preferably greater than 1 cm. The walls preferably consist of plastic material with a small wall thickness, that is to say smaller than 2 mm and more in particular than 1 mm, such as 0.2 mm. The walls can be made of any material known in the art, such as polycarbonate, polymethyl methacrylate and the like.

A water supply line 7 with dispensing nozzles 6 is present at the top of the deck. By dispensing water, along the inner wall 5, a water layer 10 extends over a large part of its surface. This layer has a relatively small thickness, that is to say say, a thickness of less than 2 mm and preferably about 1 mm. In any case, the thickness of the water layer indicated by b is substantially smaller than the aforementioned distance a, so that between the top of the water layer 10 and the outer wall 4 a free space remains that is filled with gas such as air. This space acts as insulation.

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Fig. 3 shows an example of a panel 3 according to the invention. The outer wall 4 and inner wall 5 are designed in the form of a wave and with the aid of end parts 8 they can be coupled to a further structural construction. Reinforcement webs 9 are present. Water preferably flows into the inclined parts 5 of the inner wall 5. By the use of surface tension reducing agents, a broad relatively thin layer of water can be ensured. With the aid of this water layer, the effects described above in the introduction to the description can be obtained. That is, unlike constructions according to the state of the art, no heating of the water takes place because this is basically crystal clear. Of course, other crystal-clear liquids can be used instead of water. By applying / adding to the water, the light H transmission properties can be influenced and heat may or may not be absorbed or released or the UchtmvaV emission may be influenced.

Due to the use of plastic panels, a relatively small wall thickness can suffice as indicated above. Because plastic can be made more light-transmitting than glass and due to its smaller wall thickness, a particularly high light transmission can be achieved in combination with a crystal-clear liquid. In addition, the weight of the structure can be considerably reduced compared to structures that are made up of double glazing.

The water or other liquid is preferably supplied from the nozzles 6 at a relatively low temperature if it is desired to cool the structural structure internally. A temperature of 5-12 ° C is mentioned as an example if a temperature rise of the liquid film 10 of more than 20 and preferably about 30-40 ° C is envisaged. The temperature of the water should not be so low that freezing can occur.

H A conventional solar boiler or cooling structure can be provided by temporarily filling the space between walls 4 and 5.

Although the invention has been described above with reference to a preferred embodiment, it will be understood by those skilled in the art that numerous modifications can be made thereto in order to fall outside the scope of the present application, as described in the appended claims. .

I 1023900

Claims (12)

A partition for separating two spaces comprising two light-transmitting partition walls spaced (a) by more than 5 mm, means 5 being arranged for moving a liquid between said partition walls, said means comprising liquid dispensing means adapted to dispose of providing a fluid film, one of said partition walls being an outer partition wall, and the other of said partition walls being an inner partition wall, said fluid film moving over said inner partition wall, characterized in that between said fluid film (10) and the outer partition partition wall (4) a heat insulating space (18) is present. 2. A partition according to claim 1, which is arranged inclined, wherein said outer partition wall is the upper partition wall and the inner partition wall is the underlying partition wall. A barrier according to claim 1 or 2, wherein the liquid film has a layer thickness (b) of less than 5 mm and in particular less than 1 mm. Separation according to one of the preceding claims, designed for separating the interior of an architectural structure (1) and the environment, wherein said liquid-provided partition wall (5) adjoins the interior of that architectural structure. 5. Structural construction comprising a partition according to one of the preceding claims. 6. Structural construction as claimed in any of the foregoing claims, wherein a heat sink is present for dispensing / receiving said fluid to the fluid dispensing means resp. of the liquid from that panel. 7. Method for controlling the temperature in a room, which room is provided with a light-transmitting partition consisting of a distance of at least 5 1023900-Η I 8 mm partition walls, one partition forming the boundary with that space and the other partition forming the boundary with that space. forms an environment film, in which a liquid film is applied to a partition wall, such that the II top side of the liquid film is spaced apart from that other partition wall, wherein II an insulating II gas is applied in that gap between said liquid film and said other partition controlling the amount of liquid supplied / discharged the heat transfer to / from that space is determined. 8. A method according to claim 7, wherein said liquid film is 95% or more transparent. The method according to a + of claims 7 or 8, wherein said liquid comprises water and / or 11 glycol. I 15 10. Method as claimed in any of the claims 7-9, wherein surface tension reducing means are provided on said liquid and / or on said one partition wall. 11. Method as claimed in any of the claims 7-10, wherein light-influencing additives are provided in said liquid. The method of any one of claims 7 to 11, wherein the supply temperature of said liquid is lower than 14 ° C. I 1023900 *