Patent EA-002295-B1 (EA)
Title: Device for heating with solar energy
Inventor: VEN LIVIEN DOMIEN
IPC: F24S20/20
Filed: 1999-02-09
Abstract: 1. Device for heating with solar energy, which device contains at least one mirror construction (1) which is mounted on a frame (3) and which can be directed towards the sun, and at least three collectors (4) at equal distance from each other, extending parallel to the mirror construction (1) in order to collect the solar-radiation reflected by the mirror construction (1) whereby the mirror, construction (1) contains a number of almost flat mirror strips (2) extending next to one another in the longitudinal direction of the collectors (4) and with their longitudinal direction northward/southward and which are each provided on the frame (3) such that they can rotate around their longitudinal direction, whereas the collectors (4) are stationary in relation to the frame (3), whereby the mirror strips (2) are situated in an almost horizontal plane with their axes of rotation, whereby the device contains means (16) to rotate the mirror strips (2) and the mirroring surface of the mirror strips (2) such that the solar rays coming in on said surface can be reflected towards the collectors (4)and control means (21) commanding the means (16) to rotate in function of the position of the sun, characterized in that, when three adjacent collectors (4) are considered, the mirror strips (2) thereunder are divided into two series, the mirror strips (2) of one series reflecting to the collector (4) situated in the middle while the mirror strips (2) of the other series reflect to the one of the other two collectors (4) situated above the series, the control means (21) commanding the -means (6) to rotate in such way that , in the morning, a first series of mirror strips (2) situated between the middle collector (4) and the collector (4) situated to the east thereof reflect towards this latter' collector (4) , whereas the second series of mirror strips (2) situated between the middle collector (4) and the collector (4) situated to the west thereof reflect towards the middle collector (4) and that, after- the sun has passed its highest point during the day, i.e. in the afternoon, the first series of mirror strips (2) reflect towards the middle collector (4) and the second series of mirror strips (2) reflect towards the collector (4) situated to the west thereof. 2. Device according to claim 1, characterized in that the mirror construction (1) consists of two segmented, semi-parabolic mirrors which extend parallel to one another and whose segments have been flattened and have been placed in a horizontal plane. 3. Device according to claim 1 or 2, characterized in that the mirror construction (1) is further extended with at least one additional series of mirror strips (2) and with an extra collector (4) per series. 4. Device according to any of the preceding claims, characterized in that the means (16) to rotate the mirror strips (2) are means to rotate at least a number of the mirror strips (2) or all the mirror strips (2) together, simultaneously and to the same extent. 5. Device according to claims 1 and 4, characterized in that the means (16) to rotate the mirror strips (2) are means to rotate at least all the mirror strips (2) which are situated between two collectors (4). 6. Device according to claim 4 or 5, characterized in that the means (16) to rotate at least a number of mirror strips (2) simultaneously have a wheel, for example a sprocket wheel (17) or a toothed wheel. 7. Device according to any of the preceding claims, characterized in that the collector (4) contains at least one heat-absorbing tube (23-24) and at least one reflector (38),  directed towards the tube (23-24) situated in between and which is erected above the tube (23-24) like a cap for collecting the solar rays reflected by the mirror construction (1) and for reflecting them to the tube (23-24). 8. Device according to claim 7, characterized in that the reflector (38) consists of two parabolic bent mirrors. 9. Device according to claim 7 or 8, characterized in that the tube (23-24) is a double-walled glass tube whose inner tube-shaped wall (24) is coated with a heat-absorbing material on the outside and whose outer tube-shaped wall is translucent', and with a vacuum between both walls (23 and 24). 10. Device according to claim 9, characterized in that a metal tube- (22) extends through the tube- (23-24), whereas the space between this metal tube (22) and the tube (23-24) is filled with a heat-transferring medium (27) such as steel wool. 11. Device according to claim 9 or 10, characterized in that expansion bellows (25) are provided in the inner wall (24). 12. Device according to claim 11, characterized in that rings (26) are provided between the two walls (23 and 24) of the tube which preferably make contact with the outer wall (23) only locally. 13. Device according to any of claims 11 to 12, characterized in that above the mirror construction (1), several tubes (23-2.4) are provided one after the other around a single metal tube (22), and in that these tubes (23-24) are carried -by this metal tube (22). 14. Device according to any of the preceding claims, characterized in that the collector (4) contains a metal tube (22) for fluid to be heated, suspended at regular distances on a longitudinal profile (30) which is part of the frame (3) by means of a trolley (29) which can ride over this longitudinal profile. 15. Device according to claim 14, characterized in that the longitudinal profile (30) is provided with expansion joints (31) and in that the trolley (29) contains two front and two back wheels (32) which are not placed on the same axis, but which are shifted in relation to one another in the driving direction. 16. Device according to claim 14 or 15, characterized in that the metal tube (30) is suspended by means of a suspension containing two bars (33 and 37) which are screwed together in a sleeve (36) , so that they can be adjusted in relation to one another by turning the sleeve.