Date of download: 1/15/2018 Copyright © ASME. All rights reserved. From: Continuous Solar Carbothermal Reduction of Aerosolized ZnO Particles Under Vacuum in a Directly Irradiated Vertical-Tube Reactor J. Sol. Energy Eng. 2016;138(2):021010-021010-14. doi:10.1115/1.4032685 Figure Legend: Schematic layout of the experimental setup, showing the solar vacuum aerosol reactor at PSI's HFSS. Reactants are introduced by a rotary particle feeder (1) into the graphite absorber tube (2). Reaction products are precipitated on the condenser (3). Particles exiting the reactor are collected in a collection vessel (4) and entrained fine particles are withheld by means of filter paper (5). Inert Ar gas flows are controlled by mass flow controllers (FC), and the system pressure is recorded at the top of the reactor (P). Online gas analysis includes infrared (IR: CO, CO2, and CH4) and TC detectors (TC: H2) as well as a micro-gas chromatograph (GC). Additional instrumentation consists of needle valves to adjust system pressure (6) and Ar gas flow at p < 10 mbar (7). An overpressure relief valve (8) provides safety when the setup is pressurized at completion of experiment.