Table IV-APP-2 POWER CONVERSION SYSTEMS COMPARISONS Component technology understood; no breakthrough required. Ground tests of Brayton conversion system straight-forward, except for life tests. , AC power generation in large blocks - minimize conductor weight. . High conversion efficienq (35-40%) provides reduced solar collector area. No space experience with large, light weight focusing collectors and cavity absorbers (degradation). , Active cooling system (radiators) required. . Pointing to sun critical Imposes as attitude control penalities . Leakage of working fluids and cooling imposes maintenance/ design problems. Degradation of output with time - amount uncertain. Major weight reductions required (factor of 2-4). . High voltage DC switching difficult. . Attitude control propellant high due to high moment of inertia (large areas/dimensions). Static conversion (no moving parts) provides long life and good reliability. Direct conversion of solar radiation to electricity provides design simplicity and improved reliability. Modularity provides flexibility in assembly and repair/re- placement. . Passive thermal control, no radiator.
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