Reivindicaciones
1. Concentrating device for concentrating solar radiation, with longitudinal mirrors (7) and a longitudinal receiver (1), based on a array of slightly concave mirrors (7) parallel to one another, having a markedly longitudinal geometry, i.e., being much longer than it is wide, which can rotate about their longitudinal axis of symmetry (14), which in turn is the axis serving as support in bearings, which are placed on the pillars (9) which, every certain length interval, are buried in the ground and rigidly support the mentioned bearings, therefore the securing axis, which furthermore is a rotating shaft, is always fixed in that straight line position, each mirror being orientated by rotation for reflecting radiation towards a longitudinal parallelepiped solar receiver (1), the longitudinal axis of symmetry thereof located at a height H above the height of the axis of the mirror (5) closest to the receiver (1) as a result of columns or pillars (8) supporting it, with an active face (2) where it receives radiation (6) reflected by the mirrors (7), the active surface (2) having a transverse width R; the receiver (1) containing internal elements (19) absorbing solar radiation, said receiver (1) having a longitudinal geometry and its greatest length parallel to the longitudinal axes (14) of the mirrors, and having a transverse angle of inclination (90) with respect to the horizontal, there being a final mirror (32) furthest from the receiver, two fields of mirrors being able to be assembled symmetrically with respect to two parallel receivers with active faces arranged opposite one another, each face pointing to a field, particularly in assemblies in which the longitudinal axes follow the local meridian, and being assembled both to the north and to the south of the receiver in cases in which the longitudinal axes of the mirrors are parallel to the local astronomical latitude, in which assemblies there can also be two parallel receivers with the active faces arranged opposite one another, each face pointing to a field, the positions and angles being expressed in a coordinate system in the working plane used, which is a plane perpendicular to the longitudinal axes, and therefore transversally and perpendicularly intersects the receiver and the mirrors, the position of the sun being projected on said working plane according to astronomical data, and the y-axis of the coordinate system in the working plane being the vertical line (10) passing through the central or mid-point (3) of the segment representing the active face (2) of the receiver (1) in the working plane, and the x-axis (11) being the horizontal line passing through the central point (88) of the segment which, in the working plane, represents the mirror (5) closest to the receiver (1); selecting the value of the acute angle (115) forming with the horizontal the line joining the central point (89) of the furthest mirror (32) of the field and the central point (3) of the active surface (2) of the receiver (1) in a range of values between 10º and 80º, with a reference value of 45º; and the inclination of the active face (2) of the receiver (1) being determined in that the segment marking said surface in the working plane is perpendicular to the bisector of the field (91), said bisector being that of the angle formed with the lines going, respectively, from the central point of the active face of the receiver (3) to the central point (88) of the closest mirror (5), and to the central point (89) of the furthest mirror (32), characterized in that the transverse width of the active surface or face (2) of the receiver (1) is 1% of the straight line distance between the central point (89) of the furthest mirror (32) of the field and the central point (3) of the active surface (2) of the receiver (1); and the mirrors (7) are made up of two different parts on each side of the central point (35) of each mirror (7), both parts having a circular concavity, but with different radii of curvature, the latter being selected in a range of values between twice the distance from the central point (35) of the mirror (7) to the central point (3) of the active surface (2) of the receiver (1), and that value increased by 20%; the slope of the mirror being nil at its central point measured in the intrinsic coordinate system of each mirror, in which the y-axis is the normal at the central point (35) and in the reference position of the mirror coincides with the line joining said central point (35) with the central point (3) of the active face (2) of the receiver (1); and in each of the mirrors, its central point (35) of the specular surface coincides in that section with the longitudinal securing axis about which the mirror in question is rotated. 2. The concentrating device for concentrating solar radiation with longitudinal mirrors and a longitudinal receiver according to the preceding claim, characterized in that the specific width of each mirror is determined depending on a value P, which is set by design, this value P being the quotient between the maximum drift of rays allowed in the mirrors and the value of the width R of the active surface (2) of the receiver (1 ); the angle Agm being identified for the mirror in question, which angle when assembled according to the meridian is half the largest angle of the following two angles: - the angle formed by the line going from the central point of the mirror to the central point of the active surface of the receiver with the line marking the arrival of solar rays, during actual sunrise, on the central point of the mirror; - the angle formed by the line going from the central point of the mirror to the central point of the active surface of the receiver with the line marking the arrival of solar rays, during actual sunset, on the central point of the mirror; and when assembled according to the parallel said angle Agm is half the angle formed by the line going from the central point of the mirror to the central point of the active surface of the receiver with the line having from the central point of the mirror an angle of sight on the positive x-axis equal to the sum of the complementary angle of the latitude plus 20º, without being able to exceed this angle of sight of 90º; the width E of the mirror in question being that given by the equation E = 2 ⋅ P ⋅ R / 1 - cosAgm <img class="EMIRef" id="467210345-ib0025" /> 3. The concentrating device for concentrating solar radiation with longitudinal mirrors and a longitudinal receiver according to any of the preceding claims, characterized in that when assembled according to the meridian, the radius of curvature, RCn, of a mirror (7) is established by RCnp = 2 ⋅ D / cos 90 o ̲ - Aer / 2 D being the distance from the central point (35) of the mirror (7) to the central point (3) of the active surface (2) of the receiver (1), and Aer being the angle of sight of the line joining the central point (35) of the mirror (7) in question with the central point (3) of the active surface (2) of the receiver (1) with respect to the positive x-axis of the general coordinate system, which is parallel to the horizontal of the location. 4. The concentrating device for concentrating solar radiation with longitudinal mirrors and a longitudinal receiver according to any of the preceding claims, characterized in that when assembled according to the parallel, the angle Acf is defined as the sum of the value of the complementary angle of the latitude of the location plus a value selected between 1º and 23º, 20º being used as a reference value of the addend, the value of Acf not being able to exceed 90º; Aer being the angle of sight of the line joining the central point of the mirror with the central point of the receiver with respect to the positive x-axis of the general coordinate system, and D being the distance from the central point (35) of the mirror (7) in question to the central point (3) of the active surface (2) of the receiver (1), the radius of curvature when assembled according to the parallel, RCnp, being established at the value RCnp = 2 ⋅ D / cos Acf - Aer / 2 <img class="EMIRef" id="467210345-ib0027" /> 5. The concentrating device for concentrating solar radiation with longitudinal mirrors and a longitudinal receiver according to any of the preceding claims, characterized in that the rotation given to each of the mirrors (7) for focusing on the sun at all times is defined in that the normal (77) to the mirror (7) in its central point (35) coincides with the bisector (45) of the angle formed in the working plane by the projection in that plane of the central ray (43) of the solar beam striking that central point (35) and the line going from this point (35) to the central point (3) of the active surface (2) of the receiver (1) already defined in that plane; and said central point (35) of the specular surface coinciding with the longitudinal axis of rotation of the mirror.
