The conceptual design of an innovative solar space power system based on thermionic conversion of heat to electricity is in progress. The system is particularly attractive for large power requirements (>20 kW). Solar energy is collected with an inflatable structure, which can be a parabolic reflector or a Fresnel lens or reflector. The solar flux is further concentrated with a secondary concentrator before entering the thermal receiver. The heat is converted to electricity directly by cylindrical inverted multi-cell (CIM) thermionic converters. Initial estimates of volume and mass yield a preliminary specific mass of ∼100 W/kg and a preliminary specific stowed volume of ∼80 W/m3.

Topics
Solar energy, Thermionic conversion, Power electronics, Lenses, Plasma devices
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© 2002 American Institute of Physics.
2002
American Institute of Physics
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