MULTI-FOIL© insulation for high temperature applications; summary of RACCET and EGD experience for the ISUS program

Statistics – Applications

Scientific paper

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Solar Collectors And Concentrators, Thermionic Conversion, Thermal Radiation

Scientific paper

This paper summarizes the recent experience with high temperature MULTI-FOIL thermal insulation and compares the results with those obtained in the 1960s. In contrast to other energy conversion systems such as Brayton, thermoelectric, AMTEC, or thermo photovoltaic, the thermionic ISUS (Integrated Solar Upper Stage) operates at high temperatures, up to 2500 K. The ISUS uses a solar receiver, a concentrator heating a graphite absorber, which is part of the RAC (Receiver Absorber Converter) module, further described by Rochow (1996) and Westerman (1995). The MULTI-FOIL surrounds the absorber and minimizes the heat losses from it. During the propulsion phase of the mission the thermionic converters, the third part of the RAC, are thermally shielded from the absorber by a movable Multi-Foil assembly. For the lower phase the insulation at the converter is lowered, exposing the converters to the hot absorber.

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