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84 Integrated system design 500 400 300 200 100 0 −100 −200 −300 −400 −500 −500 −400 −300 −200 −100 0 [m] 100 200 300 400 500 90 ≤ ηH 80 ≤ ηH 70 ≤ ηH 60 ηH T ≤100 T <90 T <80 < 70 ≤ 50 ≤ ηH T T <60 (a) Field distribution, present work. (b) Field distribution, Collado [11]. Figure 4-15: Calculation of the heliostat distribution and field efficiency expressed in the different colors of the heliostats. leads to a larger radial distance between them. The individual field efficiency of the heliostats can be used for further optimization options regarding the repositioning or elimination of heliostats with an efficiency lower than a threshold value. 4-2-4 Heliostat field dimensioning In order to dimension the heliostat field, it is necessary to obtain the instant power collected by the solar tower system, which depends on the performance parameters of the heliostats and the components associated with the receiver and storage systems, N W ̇ HR = ZAHTζIηAVAηRCηSTO ηHT(i), (4-64) i where Z is the product of the mirror reflectiveness and the cleanliness, AHT is the area of the heliostat, ζ is the fraction of mirror area in the heliostat, I is the solar irradiation, ηAVA is the field availability, ηRC is the receiver efficiency, and ηSTO is the efficiency of the storage system. The index i corresponds to a single heliostat, N to the number of heliostats in the field. The values assumed in this work are taken from the work of Collado [11] and they are listed in Table 4-5. Table 4-5: Assumed values used in the dimensioning of the heliostat field [11] Parameter Solar irradiation Mirror reflectiveness x cleanliness Fraction of mirror area Field availability Receiver efficiency Storage efficiency I W/m2 Z — ζ — ηAVA — ηRC — ηSTO — Value 918.00 0.8883 0.9583 0.99 0.88 0.99 J.S. Bahamonde Noriega Master of Science Thesis [m]PDF Image | Design method for s-CO2 gas turbine power plants
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