HIGH TEMPERATURE SOLAR THERMIONIC GENERATORS.
Rept. for 15 Apr 63-31 Aug 64.
TRW INC CLEVELAND OHIO
Pagination or Media Count:
The results of solar evaluations of a 100 watt thermionic generator conducted under a solar flux range of 80 to 100 wattssq. ft. are presented. Generator performance optimization, misorientation, cyclic and transient response tests were accomplished. Good correlation of the generators solar performance with laboratory performance was obtained and indicated that at the 130 wattssq. ft. solar flux level of outer space, the generator would be capable of achieving the full design power output of 100 watts. In addition, results of cyclic and continuous life test of practical hardware thermionic converters are given for three design iterations. Discussion of design details, and life limiting characteristics of each design, through a two year development period illustrate the progress made in extending the continuous life operation to over 3600 hours and cyclic life operation beyond 2900 deep thermal cycles. The preliminary design of a solar thermionic generator was also completed. Because of the unexpected long life approximately 3000 hours of continuous operation demonstrated by the converter, an alternate generator design, utilizing thermal energy storage was completed. Author