Design method for s-CO2 gas turbine power plants

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Design method for s-CO2 gas turbine power plants ( design-method-s-co2-gas-turbine-power-plants )

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4-2 Solar tower power plant 81 Figure 4-13: Simplified blocked projection of heliostat B on heliostat A (based on the works of Collado et al. [6]). Several assumptions are taken. The vector HR remains constant through all the points in the heliostat surface and it is considered that the azimuthal angle between heliostats in consecutive rows is negligible. Another assumption is that there is no inclination of the ground surface. Additionally, the blocking of the heliostat is produced only by the heliostats in front of it in the previous row (closer to the tower). Finally shading was neglected since it is small compared to the blocking effect. These assumptions allow to build the geometrical relations based on Figure 4-13. The blocked section in the main heliostat corresponds to |GF |. The figure shows that It can be proven that |GF | = |AF | − |AG|. |AG| = |AD| − |AF |. (4-54) (4-55) (4-56) (4-57) Combining these two expressions it is possible to obtain |GF |, |GF | = 2|AF | − |AD|. |AD| can be obtained by means of a simple trigonometrical analysis, |AD| = |AB|cos(εHR). cos(ω) Finally, combining the last two expressions the height of the blocked section, called BL from now on, can be found, BL = LHT − ∆Rcos(εHR). (4-58) cos(ω) In this equation 2|AF | has been replaced by LHT, the height of the heliostat. Likewise, |AB| has been replaced by ∆R, the radius between consecutive heliostats. The blocked surface in the heliostat problem has a rectangular shape with height BL. It is necessary to obtain the width of this polygon. To do so, the blocking heliostats are projected Master of Science Thesis J.S. Bahamonde Noriega

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