Date of download: 12/29/2017 Copyright © ASME. All rights reserved. From: The Development of Direct Absorption and Storage Media for Falling Particle Solar Central Receivers J. Sol. Energy Eng. 2015;137(4):041003-041003-7. doi:10.1115/1.4030069 Figure Legend: The specific heat capacity of several proppant materials is available from CARBO. Data provided by Eric Coker, SNL.

Date of download: 12/29/2017 Copyright © ASME. All rights reserved. From: The Development of Direct Absorption and Storage Media for Falling Particle Solar Central Receivers J. Sol. Energy Eng. 2015;137(4):041003-041003-7. doi:10.1115/1.4030069 Figure Legend: Images of CARBOHSP in the (a) as-received state, (b) after heating in air at 1000 °C for 192 h, and (c) following chemical reduction in forming gas at 1400 °C

Date of download: 12/29/2017 Copyright © ASME. All rights reserved. From: The Development of Direct Absorption and Storage Media for Falling Particle Solar Central Receivers J. Sol. Energy Eng. 2015;137(4):041003-041003-7. doi:10.1115/1.4030069 Figure Legend: (a) The change in solar weighted absorptance of the four CARBO candidate particle materials as a function of heating time at 700 °C in air and (b) spectral hemispherical absorptance data for CARBOHSP and ACCUCAST in the as-received condition and following heating at 700 °C in air for 500 h

Date of download: 12/29/2017 Copyright © ASME. All rights reserved. From: The Development of Direct Absorption and Storage Media for Falling Particle Solar Central Receivers J. Sol. Energy Eng. 2015;137(4):041003-041003-7. doi:10.1115/1.4030069 Figure Legend: Sample mass change and time rate change of mass for: (a) the oxidation of as-received CARBOHSP in air and (b) the oxidation of chemically reduced CARBOHSP in air

Date of download: 12/29/2017 Copyright © ASME. All rights reserved. From: The Development of Direct Absorption and Storage Media for Falling Particle Solar Central Receivers J. Sol. Energy Eng. 2015;137(4):041003-041003-7. doi:10.1115/1.4030069 Figure Legend: (a) The solar weighted absorptance, αs, of chemically reduced CARBOHSP and ACCUCAST prior to heating in air (0 h) and following heating in air at 700 °C for up to 1500 h. CARBOHSP data are shown for a 700 °C reduction and for a 1400 °C reduction. Thermal emittance data at 700 °C are shown for both the 0 h and 500 h states. (b) The spectral hemispherical absorptance of chemically reduced CARBOHSP following extended heating in air. Data for unmodified CARBOHSP are also shown for comparison to the reduced materials.

Date of download: 12/29/2017 Copyright © ASME. All rights reserved. From: The Development of Direct Absorption and Storage Media for Falling Particle Solar Central Receivers J. Sol. Energy Eng. 2015;137(4):041003-041003-7. doi:10.1115/1.4030069 Figure Legend: (a) Solar weighted absorptance and (b) thermal emittance at 700 °C for sintered pellets produced from the pigments listed in Table 3 following heating in air for 500 h at 700 °C. The sample ID numbers in the x-axis correspond to wt.% of Al2O3, SiO2, and pigment, respectively.