HIGH TEMPERATURE SOLAR THERMIONIC GENERATORS.
Abstract
The results of solar evaluations of a 100 watt thermionic generator conducted under a solar flux range of 80 to 100 watts/sq. ft. are presented. Generator performance optimization, misorientation, cyclic and transient response tests were accomplished. Good correlation of the generator's solar performance with laboratory performance was obtained and indicated that at the 130 watts/sq. 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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 31, 1964
- Accession Number
- AD0604574