Page 215 - Design of Solar Thermal Power Plants

3.7 CALCULATION OF ANNUAL POWER GENERATION 199

Step II: Considering the concentration field area is basically propor-
tional to the output, and the decrease of concentration field efficiency after
increase of the scale of concentration field, the concentration field area is
2
reassumed to increase by 5 times and reach up to 500,000 m . Based on the
concentration field design software, the output efficiency of concentration
field at the design point can be calculated, which is 63%, and the intercept
factor of receiver is 95%.
In this case, the output power P concentrator of concentration field is:

P concentrator ¼ 63% 95% 500,000 0.75 ¼ 224.4 (MW)
According to the method specified in 3.2, the efficiency of receiver can
be calculated, which is 85%.
In this case, the output P receiver of receiver is:
P receiver ¼ 224.4 85% ¼ 191 (MW)
The result is less than 250 MW of Eq. (3.79).
Step III: The concentration field area is reassumed to increase by 35%
2
and reach up to 675,000 m . Based on the concentration field design
software, the output efficiency h hel of concentration field at the design
point can be calculated, which is 62%, and the intercept factor h int of
receiver is 94%.
In this case, the output power P concentrator of concentration field is:
P concentrator ¼ 62% 94% 675,000 0.75 ¼ 295 (MW)

According to the method specified in 3.2, the efficiency h receiver of
receiver can be calculated, which is 84%.
In this case, the output P receiver of receiver is:
P receiver ¼ 295 84% ¼ 247.8 (MW)
The result is nearly 250 MW in Eq. (3.79), which satisfies the calculation
requirement.
From the above, the concentration field area of the power plant is
2
675,000 m . After substituting the number into Table 3.1, and calculating
term by term, results can be obtained in Table 3.10.
h T ¼ h hel h int h receiver h turbine ¼ 62% 94% 84% 30% ¼ 14.7%
2
2
From Fig. 3.45, E ¼ 1850 kWh/m 14.7% 675,000 m ¼
187,310,000 kWh; namely the annual power generation approximates 187
million kWh.
Full-load generating hours of the power plant ¼ 187,310,000 kWh/
4
5 10 kWh ¼ 3746 h.