Parabolic concentrating solar collector
The element on which solar radiation is concentrated, specifically, a vacuum tube, remain static at all times with respect to the movements that a parabolic reflective surface may make according to the direction of solar radiation, such that inlet and outlet pipes of the vacuum tube do not need to be articulated, which facilitates the installation and insulation thereof and reduces production costs. The parabolic reflective surface can pivot 360° with respect to the vacuum tube without interfering with the pipes, allowing an active safety system for protecting against strong winds and preventing overheating to be produced, in addition to allowing the surfaces to be cleaned by means of nozzles spray pressurized water. The collector also includes passive safety means against strong winds.
1 . A parabolic concentrating solar collector, includes a parabolic reflective surface associated with programmed and/or calculated solar tracking in real time, as well as an element on which solar radiation is concentrated, wherein the element is made of a vacuum tube, with a corresponding duly insulated inlet and outlet of fluid to be heated, wherein the vacuum tube is statically arranged on a frame, the parabolic reflective surface pivotable with respect to an imaginary central longitudinal axis of the vacuum tube, in which bushings or bearings through which the pipes associated with the inlet and outlet of the vacuum tube pass participate, unaffected by the pivotable movement of the parabolic reflective surface, wherein the chamber through which the fluid to be heated circulates in the vacuum tube is subdivided into two concentric chambers, an internal chamber, through which the cold fluid is fed, open at one ends through which the internal chamber communicates with an external chamber, concentrically positioned, on which solar radiation is concentrated inside the vacuum tube, wherein an inlet section to the internal chamber is an outlet section of the external chamber and wherein the parabolic reflection surface includes passive safety means against strong winds, made up of sectors, of a reflective nature, as folding gates with respect to axes against the tension of a spring, and wherein the parabolic reflective surface is linked to a structure of the vacuum tube through lateral ends by arms that converge in a bearing or bushing axial to the imaginary central longitudinal axis of the vacuum tube, wherein in correspondence with the inlet and outlet of the vacuum tube, the arms are integral with a ring, which is integral with a toothed wheel with which a pinion associated with a small electric motor engages, integral with the structure of the vacuum tube.
2 . The parabolic concentrating solar collector, according to claim 1 , wherein a helical deflector is arranged between the internal chamber and the external chamber of the vacuum tube.
3 . The parabolic concentrating solar collector, according to claim 1 , wherein the frame incorporates nozzles that spray pressurized water against the parabolic reflective surface.
4 . The parabolic concentrating solar collector, according to claim 1 , wherein a Fresnel-type concentrator lens is arranged on an area of the vacuum tube that is not affected by the parabolic reflective surface, the Fresnel-type concentrator lens integral with the bearing or bushing.
5 . The parabolic concentrating solar collector, according to claim 1 , wherein the vacuum tube and the parabolic reflective surface further comprise a horizontal arrangement with respect to their longitudinal axis.
6 . The parabolic concentrating solar collector, according to claim 1 , wherein the vacuum tube and the parabolic reflective surface further comprise a vertical arrangement with respect to their longitudinal axis.
7 . The parabolic concentrating solar collector, according to claim 1 , wherein the parabolic concentrating solar collector is installed with other solar collectors, all controlled through a single control device, whereby enabling and disabling solar collectors to adapt to changing requirements is achieved with the single control device.
8 . The parabolic concentrating solar collector, according to claim 1 , further comprising at least one photovoltaic panel for electrically powering the control device.
9 . The parabolic concentrating solar collector, according to claim 1 , wherein one of the end support frames of the device has a scissor-type structure, adjustable by a transverse worm screw, which threads into respective nuts associated with the intermediate joints of the scissor structure, and which is controlled by an electric motor linked to the control device.