The GOES Imager and Sounder Radiant Coolers are controlled to run at temperatures around 100 K. Future instruments may have added detectors and additional detector heat which will cause the radiant cooler temperatures to rise if design changes are not implemented. Several coating formulations were developed and parametric thermal analyses were conducted to select the coating formulation for final coating verification. The coating formulation selected was Ag/Al2O3 (14000 angstrom)/TiO2 (6000 angstrom)/Al2O3 (14000 angstrom) vacuum deposited to a highly specular substrate. The thermal radiative properties were: solar absorbance, 0.09, hemispherical emittance at 100 K , 0.80, IR absorbance (200 K blackbody), 0.78, and IR absorbance (300 K BB), 0.65. To take advantage of the low solar absorbance of this cooler emitter coating, a change in the Astromast coating was proposed that would keep its solar absorbance/emittance ratio the same (approximately 1.0), but significantly lower the emittance and thereby lower the IR irradiance on the emitter. The net results reduce the emitter temperature by approximately 9 K.
Spectrally selective thermal coatings for improved cooler performance
1997
8 Seiten, 3 Bilder, 5 Tabellen, 7 Quellen
Aufsatz (Konferenz)
Englisch
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