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Question
(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.
(b) If the energy received by 5 m2 area in 10 minutes is 4200 kJ, calculate the value of solar constant.
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Solution
(a) The amount of solar energy received per second on one square metre area of the near-earth space 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) Area = 5 m2
Time = 10 min = 10 × 60 sec = 600 sec
Energy = 4200 kJ
Therefore,
solar constant = Energy/(Time × Area)
= 4200/(5 × 600) kJ/s/m2
= 4200/(3000) kJ/s/m2
=1.4 kJ/s/m2
=1.4 kW/m2
(b) Area = 5 m2
Time = 10 min = 10 × 60 sec = 600 sec
Energy = 4200 kJ
Therefore,
solar constant = Energy/(Time × Area)
= 4200/(5 × 600) kJ/s/m2
= 4200/(3000) kJ/s/m2
=1.4 kJ/s/m2
=1.4 kW/m2
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