Statistics – Applications
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..608..494w&link_type=abstract
SPACE TECHNOLOGY AND APPLICATIONS INTERNATIONAL FORUM- STAIF 2002. Conference on Thermophyiscs in Microgravity; Conference on In
Statistics
Applications
Solar Collectors And Concentrators, Spaceborne And Space Research Instruments, Apparatus, And Components, Solar Electromagnetic Emission
Scientific paper
Solar energy can be used in a wide variety of space thermal applications including power generation, thermal propulsion, and high temperature furnaces. The NASA Glenn Research Center (GRC) is developing the refractive secondary concentrator, which uses refraction and total internal reflection to concentrate and direct solar energy for these applications. Refractive secondary concentrators, coupled with advanced primary concentrators such as thin film inflatables can efficiently convert solar energy into heat, providing high concentration ratios (10,000:1) and high temperatures (2000 K and higher). Solar vacuum testing on a sapphire refractive secondary concentrator demonstrated 87% throughput efficiency, with projected efficiency of 93% using an anti-reflective coating. Follow-on solar vacuum testing aimed at demonstrating the high temperature capability of the refractive secondary concentrator has recently been completed. The refractive secondary concentrator was coupled with an insulated rhenium receiver and tested in GRC's Tank 6 thermal vacuum facility equipped with a solar simulator. Steady-state receiver temperatures achieved were 1155 K with 0.46 kW input to the refractive secondary concentrator, and 1455 K with 1.25 kW input. A non-steady-state maximum temperature of 1550 K was achieved with input power of 1.96 kW. Presented is a discussion of the test hardware and test results. .
Castle Charles H.
Wong Wayne A.
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