DE8816407U1 - Adjustable solar collector with an absorber through which a fluid flows - Google Patents

Description

European Patent Attorneys

Dipl.-Ing. Uwe Pagel Attorney file

Freytagstrasse 2 055-4 DE-2

3300 Brunswick

Date

Dieter Nienstedt 27 April 1989

Schäfereiweg 29
3370 Seesen-1

Adjustable solar collector with an absorber through which a fluid flows

The invention relates to an adjustable solar collector with an absorber through which a fluid flows, with at least two slats arranged parallel to one another, through which the fluid flows, which are provided with a heat absorption layer on their upper side and can be pivoted about a longitudinal axis like a blind between a closed position, in which the slats lie flat next to one another in approximately one plane, and an open position, in which the slats leave a maximum opening gap between them.

Such an embodiment can be found in DE-OS 26 24 646. This previously known solar collector also serves to protect a room from the sun's rays. When the slats are fully open, at least 85% of the light can pass through. In the closed position, the slats lie against one another, which creates the effect of a double-shell wall with a glass roof, which has a heat and noise insulating effect. The outer layer of slats has a black, non-reflective surface, while the inner surface can be any color. The slats can be adjusted manually or by means of a motor via a push rod. The slats are hollow overall and can have guide ribs in their interior for flow design.

Theodor-Heuss-Strasse ?

Telephone 0531-800 79 Telex 0-9 52620 gramm d

D-3300 Braunschweig Federal Republic of Germany ! Part number 053i-8i?97(ccm 2 + 3)

The invention is based on the object of providing an improved solar collector.

This object is achieved according to the invention in that each lamella consists of a central longitudinal tube and at least two diametrically opposed wings attached to its outer casing, which extend over the length of the lamella in a constant width and have cavities for guiding the fluid and the heat absorption layer on their upper side.

A solar collector arranged in or in front of a wall opening according to the invention closes this opening when the slats are closed and thus keeps daylight out, while when the slats are at least partially opened, daylight can penetrate through the opening. The solar collector is therefore used for daylight regulation or shading.

The underside of the blades can be white or mirrored. On particularly hot days, it may be advisable to turn the slats with their underside facing the sky in order to reflect a controlled proportion of the heat radiation. Even at particularly low temperatures, eg at night, a large proportion of the cold thermal radiation can be reflected with the slats in this position.

The fluid flowing through the lamellae is preferably a liquid, e.g. deposit-free water or a special oil, which is preferably fed via pumps in a conventional circuit.

In an advantageous embodiment, several slats can be combined into a module that has a single

common adjustment drive as well as a flow line and a return line. An adjustment device can be provided that allows the collector to follow the sun's rays.

The new solar collector can be used to scaffold roofs in whole or in part. However, it is also possible to install the slats according to the invention behind large glass fronts facing south (e.g. industrial halls, open-plan offices, residential buildings, terraces, etc.). As a shading system, the embodiment according to the invention is also suitable for roofing greenhouses in garden centers. In industrial halls in particular, considerable costs for artificial light are saved by regulating the amount of daylight.

When used as roof scaffolding, the slats are preferably installed under a glass or synthetic glass covering so that they can rotate freely. Additional glazing can be provided below the slats so that an air cushion is created between the two panes of glass, which acts as insulation to prevent condensation. The usual roof construction can be dispensed with. The quality of living and/or the possible uses of attics or similar can be improved in this way. Due to the modular design, gradual retrofitting is possible. The assembly of the individual modules and/or the replacement of defective parts is particularly easy.

In principle, it is possible to cover at least individual slats with solar cells to generate electricity, with the fluid then serving for cooling, i.e. for heat dissipation. 35

Further features of the invention are the subject of the subclaims and are explained in more detail in conjunction with further advantages of the invention using exemplary embodiments.

The drawing shows some exemplary embodiments of the invention. They show:

Figure 1 shows a cross-section through a lamella of a solar collector ;

Figure IA shows a detail of Figure 1 in a modified embodiment;

Figure 2 shows the lamella according to Figure 1 with a lower insulation;

Figure 3 shows the lamella according to Figure 2 with a housing;

Figure 4 shows the slat according to Figure 3 with an upper glass cover;

Figure 5 shows the slat according to Figure 2 installed in a translucent tube;

Figure 6 shows a slat according to Figure 1 in plan view;

Figure 7 shows several slats combined to form a module in closed position and top view;

Figure 8 shows the representation according to Figure 7 in front view and

Figure 9 in front view two side by side arranged

Modules with slats in closed and open positions.

The slat 1 shown in Figure 1 consists of a central longitudinal tube 2, which has two diametrically opposed wings 4 on its outer casing 3, which extend over the length of the slat 1 in a constant width (see also Figure 6) and have cavities 5 for guiding the fluid. Each wing 4 and possibly also the central longitudinal tube 2 are provided with a heat absorption layer 6 on their upper side. The underside 7 of the wing can be white or mirrored.

The central longitudinal pipe 2 can serve as a supply line 28 and as a discharge line 29 of the fluid, which is preferably a liquid 10 (see Figure 6). If the lamella 1 is to be operated in a two-way system, a flow pipe 11 can be inserted concentrically into the central longitudinal pipe 2 according to Figure IA, the outer casing of which has a clear distance from the inner wall of the longitudinal pipe 2 via spacers 12 and forms an annular space 13 with the latter for the return flow.

According to Figure 2, the underside of the blade 7 can be covered by insulation, which according to the embodiment also extends over the underside of the longitudinal tube 2. Figure 3 shows that this insulation 14 can be enclosed by a housing 15 made of metal or plastic. According to Figure 4, the longitudinal walls 16 of the housing 15 extend beyond the absorption layer 6 of the blades 4. In this embodiment, the housing 15 is closed by a translucent cover 17.

Figure 5 shows a modified embodiment in which the slat 1 is enclosed by a translucent tube 18, whereby the slat 1 carries between its wings 4 two diametrically opposed transparent sun protection wings 19 on the outer casing 3 of the longitudinal tube 2.

Figure 6 shows a lamella according to Figure 1 or 2 in plan view, i.e. with the heat absorption layer G on top. The cavities 5 for the liquid 10 are designed in the form of lines 20, which are each closed to the outside by plugs 21 and are connected via a flow connection line 22 and a return connection line ^J to the central longitudinal pipe 2, in which - seen in the flow direction of the liquid 10 - behind the flow connection line 22 and in front of the return connection line 23 a reducer 24 is inserted for operation in the one-way system. The central longitudinal pipe 2 merges at both ends into a connecting pipe section 25, which can be connected to a flow line 28 or a return line 29 via a sealing ring 26 and a screw connection 27 (see Figures 7 and 8).

Figure 7 shows that several slats 1 can be combined to form a module 30, which has a common adjustment drive 31 for all slats 1 as well as the aforementioned feed line and return line 29. The adjustment drive 31 is only shown schematically in the form of a rack 32, into which a gear wheel or the like, which is connected in a rotationally fixed manner to the slat 1, engages. The adjustment drive can also consist of a chain or cable drive or the like. The connecting pipe section 25 of each slat 1 also forms a pivot bearing for the slat 1, for which a central bearing 34 is also provided.

According to Figure 9, two modules 30 are shown next to each other schematically in front view, with the slats 1 of the left module in the closed position and those of the right module in the open position. The light incidence 35 is indicated by dashed lines.

Gr/Gru.

Claims (15)

Patent Attorneys GRAMM + ^: ÜNS Dipl.-Jng. Prof. Wemer Gra Dipl.-Phys. Edgar Lins European Patent Attorneys Dipl.-Ing. Uwe Pagel Attorney file Freytagstrasse 2 055-4 DE-2 Brunswick Date Dieter Nienstedt 27 April 1989 Schäfereiweg 2S
337G Seesen 1 Protection claims: 1. Adjustable solar collector with an absorber through which a fluid flows, with at least two slats (1) arranged parallel to one another, through which the fluid flows, which are provided with a heat absorption layer (6) on their upper side and can be pivoted about a longitudinal axis like a blind between a closed position in which the slats (1) lie flat next to one another in approximately one plane, and an open position in which the slats (1) leave a maximum opening gap between them, characterized in that each slat (1) consists of a central longitudinal tube (2) and at least two diametrically opposed wings (4) attached to its outer casing (3), which extend over the length of the slat (1) in a constant width and have cavities (5) for guiding the fluid and the heat absorption layer (6) on their upper side. (Figures 1 and 6) 2. Solar collector according to claim 1, characterized in that the underside of the blade (7) is covered by insulation (14). (Figure 2) _Tl _ :.::::···:;· &igr; Telephone 053i-ß0079 ThexJor-Heuss-strasse 2 ■· ■ ; Telex 0-9 52620 gramrn el D-:noo Braunschweig Bum ^srepublik Deutschland ^Tf!l " ^(f!v "5 31·&EEgr;1297 <r;nn ;.> +3) 3. Solar collector according to claim 2, characterized in that the insulation (14) is enclosed by a housing (15). (Figure 3) 4. Solar collector according to claim 3 or 4, characterized in that the underside of the blade (7) or the insulation (14) or the housing (15) is white or mirrored on its side facing away from the slat (1). 5. Solar collector according to claim 4, characterized in that the said housing (15) extends with at least its longitudinal walls (16) up to the absorption layer (6) of the wings (4) and is closed on its upper side by a translucent cover (17). (Fig.4) 6. Solar collector according to one of the preceding claims, characterized in that each lamella (1) is enclosed by a transparent tube (18). (Figure 5) 7. Solar collector according to claim 6, characterized in that between the wings (4) two diametrically opposed transparent sun protection wings (19) are attached to the outer casing (3) of the longitudinal tube (2). (Figure 5) 8. Solar collector according to one of the preceding claims, characterized in that the central longitudinal tube (2) serves for the supply and discharge (8,9) of the fluid. (Figure 6) 9. Solar collector according to claim 8, characterized in that a flow pipe (11) is inserted concentrically in the central longitudinal pipe (2), which forms an annular space (13) for the return flow with the inner wall of the longitudinal pipe (2). (Figure IA) 10- Solar collector according to one of the preceding claims, characterized in that each slat (1) can be rotated through more than 360°. 11. Solar collector according to one of the preceding claims, characterized in that the fluid is a liquid. 12. Solar collector according to one of the preceding claims, characterized in that several slats (1) are combined to form a module (30). (Figures 7 and 9). 13. Solar collector according to claim 12, characterized in that the module (30) has a common adjustment drive (31) for all slats (1). (Figures 7 and 9) 14. Lollen collector according to claim 12 or 13, characterized in that the module (30) has a flow line (28) and a return line (29). (Figures 7 and 9) 15. Solar collector according to claim 13 or 14, characterized in that the adjustment drive (31) has a rack (32) into which a gear wheel (33) or the like, which is connected in a rotationally fixed manner to a lamella (1), engages. Lens