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14/12/2020 10:25 am
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Suppose the average solar energy incident on the green canopy (leaves) of a tree is 108 J per day. The calorific value of the wood obtained from the tree could convert 1% of incident solar energy as wood, how many days will it take to produce 10 kg of wood?
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14/12/2020 10:26 am
Calorific value of wood = 15KJ/g
Conversely the same energy (15KJ) is required to form 1g of wood.
Energy required to form 10Kg of wood = 10 × 1000 × 15 = 15 × 104 KJ of energy
The average solar energy received per day = 108J day-1
But 1% of incident energy that is useful for the formation of wood = (108) / 100 = 106 J day-1
No of days required to form 10kg of wood = (15 x 104 x 103) / 106
= 15 × 10 = 150 days.