Page 16 - JCERDC Status Report

Achievements thus far

(laboratory scale) supercritical CO test loop for • Development of a (Cu-Sn)-based novel
2
closed Brayton cycle. Procurement of components hemispherical highly reflective intermetallic mirror
is in progress. During the past 6 months, the material with> 93% reflectivity; Development of
S-CO laboratory has been made ready, and all High thermally stable absorber coating with high
2
the critical components for the loop have been corrosion resistant property has been achieved.
fabricated. It is expected that the test loop will A W/WAlN/WAlON/Al O -based coating which
2
3
be up and ready by October 2015. Design of a exhibits an excellent solar selective property
tubular serpentine receiver; CFD model predicting with an absorptance of 0.959 and emittance of
efficiency >90% is ready at Sandia National Labs. 0.08 has been fabricated by reactive DC and RF
CAD designs of hybrid tubular and cavity receiver magnetron sputtering method. The reflectance
for S-CO receiver is ready and a small prototype property of the selective coating has been
2
is planned to be tested at IISc. facility. studied by UV-Vis-NIR in the wavelength range
• Development of the first 4m heliostat prototype of 0.25-2.5 μm and by Fourier Transform Infrared
2
with 2-axis tracking, with high reflectivity AlS Spectroscopy (FTIR) in the wavelength range of
glass, linear actuator for elevation, and geared 2.5- 25 μm. The multilayer absorber deposited on
motor for azimuth motion. First heliostat prototype SS substrates exhibited high solar selectivity (αs/
gives us insights in to the actual cost, weight and εT) of 0.932/0.08 even after heat-treatment in air
other requirements of a heliostat. Test protocols up to 500°C for 2h. At 550°C, the solar selectivity
and guidance for setting up optical test facilities decreased significantly on SS substrates (αs/εT =
at Thermax are being provided by NREL and 0.820/0.50).
Sandia. • Optimization of scroll geometries for small-scale
ORC is complete. Completed machining of

16 Indo-U.S. Joint Clean Energy Research and Development Center