been multiplied by the same factor of 3.5. Power availability (plant factor) is assessed at 95%. In the example given in Table 7-2, the satellite returns in 30 years 32.63 times more energy than required to establish and maintain it; "payoff" is achieved in less than one year. Note that 90% of the energy is used in transporting the system to orbit. Table 7-2. Energy Balance (Solar Brayton Cycle)
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