Central collector solar energy receivers

The influence of certain astronomical and constructive parameters on the concentration of solar radiation with plane heliostats fields

“…The main conclusion which results, is that the marginal region of ECR is characterized by strong temporal and spatial gradients of the concentrated flux. This fact justifies the special analysis of the fluids running lines on the receiver [1,7] as well as the control of the fluid flow in case of transitory states [30]. At the same time, we remark that owing to the irradiance hourly variation the daily deviation of the concen- Fig.…”

“…The image plane was covered with 21 x 21 points rows both in east-west and nadirzenith directions. The distance between the points rows, in both directions, is p = 0.25 m. We analysed the following eight points (I, J) : A(5,11 ), B (6,11 ), C (7,16), D (7,11), E ( 11,17), F(l 1, 16), G ( 11,15), H (11,11).…”

“…This situation is due both, to the fact that the existing designs and achievements reach different goals and performances and, that the subject is still under consideration. The constructive solutions related to the geometrical part of a HFT are principally differentiated by the number of heliostats, which may vary from several tens [1] up to a couple of ten-thousand [2,3], the mirrors form, which can be square [1,[3][4][5][6][7][8], rectangular [9], polygonal [10] or circular [5,11], the mirror surface area, which varies between 4 and 50 m2 [1,3,4,7,9,19], and by the mirror surface curvature, which can be spherical, toroidal, paraboloidal [5,8] or plane. The area of the heliostats fields varies between several thousands of square meters [5] up to several millions of square meters [2,3], while the field form is either rectangular or square [2,3,9], circular [13] or sometimes more complicated [5,14].…”