6.54 Assuming a 10% loss due to heating up the window, struts, lenses, and inside mirrors, the sunlight power entering the hull was: Pinput sunlight 2 -Slxl0 7 - 2.79xlo7 watts --_-9-- - (Actually, the sunlight did not shine continuously on the agricultural area. As stated in Section VI.11.4, there were 6 hours of darkness for every 18 hours of daylight. However, this energy-flow analysis considers the worst case: daylight.) Appendix VI.E presents a breakdown of the electrical power needs leading to a per person electrical power requirement of: Pinputelectrical per person Pinputoperations per person + P . inputlifestyleper person + Pthermal per person 2.0xlo 3 watts/person+ 3.6xl0 3 watts/person + Pthermal per person Since the colony population was set at 1000, P = 5.6xl0 6 watts + P inputelectrical thermal Therefore, the total power input into the hull would be: Pinputtotal = 3.35xl07 watts+ Pthermal It is this power input which had to be matched by the power output to maintain a steady temperature inside the hull.
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