A three-axis stabilized satellite has two solar arrays. Each array has an area of 5m². At the beginning of life each of the solar sails generate 4kW of electrical power, which falls to 3.6 kW at the end of the satellite's useful lifetime. 1 kW of power is needed for housekeeping (running the satellite systems) and 3 kW is devoted to the telecommunication system. a. Calculate the efficiency of the solar cells at beginning of life. Assume an inci- dent solar power of 1.36 kW/m2, and normal incidence of sunlight on the sails. b. Caleulate the efficiency of the solar cells at end of life. E lfone of the solar sails fails and produces no power, how much power is avail- able to the telecommunication system.
A three-axis stabilized satellite has two solar arrays. Each array has an area of 5m². At the beginning of life each of the solar sails generate 4kW of electrical power, which falls to 3.6 kW at the end of the satellite's useful lifetime. 1 kW of power is needed for housekeeping (running the satellite systems) and 3 kW is devoted to the telecommunication system. a. Calculate the efficiency of the solar cells at beginning of life. Assume an inci- dent solar power of 1.36 kW/m2, and normal incidence of sunlight on the sails. b. Caleulate the efficiency of the solar cells at end of life. E lfone of the solar sails fails and produces no power, how much power is avail- able to the telecommunication system.
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