Question

 If the energy received by 5 m² area in 10 minutes is 4200 kJ, calculate the value of solar constant.

Answer 1

 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