Calculating Efficiencies
A solar power tower has 50 heliostats, each of which has an active area of
Interpretation:
The percent efficiency of the tower is to be calculated.
Concept Introduction:
Hundreds of sun-tracking mirrors, called heliostats, form a tower.
The percent efficiency of heliostats is given by:
Solution:
Since the total power produced is
The conversion of kW into W is as follows:
Since the total number of heliostats is
Hence, the active area is
The solar energy falls on the active area at the rate of
Therefore, the input power is
The percent efficiency of heliostats is calculated as follows:
Substitute
The tower gives a percent efficiency of
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