If extensive use of reflectors is planned, a thorough reflection analysis must be undertaken which must also take into account the changing angles of incidence as the sun rises and sets. A thorough radiation analysis has been made of the present configurations which has led to the present selection of the horizontal radiator with sunshield as the optimum case because of its high radiating power, good day-night stability and relatively wide range of latitudes for which it is suitable. The horizontal radiator with active horizontal shielding is suitable for equatorial regions and the inclined plate system may be suitable for higher latitudes i.e., >45°. It should be noted that shielding is very light at 1 g/m2 so extensive use is justified. In equatorial locations it is necessary to use mobile shielding in a dynamic manner to compensate for day-night shifts and annual shifts in sun angle. Manufacturing Techniques Plate Two methods were developed for manufacturing plates in situ and are shown in Fig. 6. Each has the same first step of grading a lunar surface at an angle of 5° in both the width and the length directions. Next the surface is grooved at an angle of 30° with 5 cm separation with the grooves running across the width. Next the soil is melted using solar concentrators one section at a time. Then the process is repeated for a mirror image plate on the other side. The zone between the two plates is used as the central condensate collection gutter.
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