Page 269 - Design of Solar Thermal Power Plants

4.3 DESIGN OF THE SOLAR TOWER POWER PLANT 251

Tower

X
R m+1
R m

(m--1,n+1) min

θ (m--1,n+1) max
ΔR min
θ

θ (m+1,n) min

θ (m+1,n) max

-y
FIGURE 4.18 Schematic diagram of circumferential spacing calculation.

the direction of reflective beams between adjacent front-and-back
heliostats. Calculation of the azimuthal spacing between
heliostats is shown in Fig. 4.18.
For heliostats on the staggered ring:

qðm; nÞ max ¼ Angleðm; nÞ max Angleðm 1; nÞ

(4.18)
¼ arcsin½D m =ð2R m 1 ފ þ arcsin½D m =ð2R m ފ
For the second and other heliostats on the first ring:

qðm; nÞ max ¼ Angleðm; nÞ max Angleðm þ 1; n 1Þ

¼ arcsin½D m =ð2R m ފ þ arcsin½D m =ð2R mþ1 ފ
For the second and other heliostats on the essential ring:

qðm; nÞ ¼ Angleðm; nÞ Angleðm 1; n 1Þ
max max

(4.19)
¼ arcsin½D m =ð2R m 1 ފ þ arcsin½D m =ð2R m ފ