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(a) What is solar constant? What is the value of solar constant?
(b) If the energy received by 5 m2 area in 10 minutes is 4200 kJ, calculate the value of solar constant.
(a) The amount of solar energy received per second on one square metre area of the near-earth space (exposed perpendicularly to the sun rays) at an average distance between the sun and the earth is called the solar constant.
Its value is 1.4 kJ/s/m2 or 1.4 kW/m2.
(b) Given,
Area = 5 m2
Time = 10 min = 10 × 60 sec = 600 sec (converted minute into second)
Energy = 4200 kJ
Solar constant = ?
Solution
We know that,
$Solar\ constant=\frac{Energy}{Area\times Time}$
$=\frac{4200}{5\times 600}$
$=\frac{7}{5}$
$=1.4kJ/s/{m}^{2}$
$=1.4kW/{m}^{2}$
Thus, the value of solar constant will be 1.4kW/m2.