Solar Rotary Reactor for Continuous H2 Production Using Two-(4)

otor with reactive ceramics was fabricated as follows: SUS304 tube which had a stem in the center was divided 8 fractions and was covered with quartz wool and YSZ powder mixed with inorganic heat-stable adhesive, then emulsion of reactive ceramics (CeO2 or Ni,Mn-ferrite) and ethanol was heaped up on the mixtures of YSZ powder and inorganic adhesive. The cylindrical rotor with reactive ceramics was dried at 393K and heated at 1473K in the solar furnace using an infrared image furnace. The cylindrical rotor was rotated by an electric motor at the rate of 360/n (n=2) degrees a 10 min intermittently. The sealing gas of Ar was exhausted from the outlet equipped on top and bottom of the furnace owing to separate the gases evolved in the oxygen releasing reaction and hydrogen generation reaction cells. The temperatures of reactive ceramics in the reaction cells were measured by the R-type thermocouples covered with ferrite (Fe3O4) and located near the surface of the cylindrical rotor. 3. Theoretical Calculations Nomenclature ρ density (kg m-3) C specific heat (kJ kg-1 K-1) µ thick (m)The maximum temperature of the reactive ceramics loaded on a cylindrical rotor was estimated by the calculation of heat transfer from the infrared image lamps to the oxygen releasing reaction cell in the rotarytype solar furnace. It was supposed that thermal energy was transferred by conduction in order of quartz glasses, the reactive ceramics, insulation (YSZ powder and inorganic heat-stable adhesive), quartz wool and a stainless steel rotor (Fig.3). The reactive ceramics were considered to be in contact with the quartz glass of the cylindrical rotor’s side. An Ar gas was passed through the oxygen releasing reaction cell at the flow rate of 1100cm3 min-1 and took thermal energy away from the heated materials of solar furnace at the rate of specific heat at constant pressure (Cp=2kJ kg-1 K-1).Reactive ceramics Insulation Quartz wool Stainless steel Heat transfer by Ar gasDensity (kg m-3) Specific heat (kJ kg-1 K-1) Thick Thermal conductivity (m) (W m-1 K-1) Table 1 The density, specific heat, thick, and thermal conductivity for the materials employed to fabricate the solar furnace.Ty erg l en ma herQuartz glass 2700 0.8 0.6 0.4 0.4 0.46 0.033 0.001 0.005 0.005 0.003 0.8 0.2 0.04 0.04 16.3Reactive ceramics 2000 Insulation 2000 200 7800Heat transferQuartz glassQuartz wool Stainless steelFig.3 Schematic outline of heat transfer for the cylindrical rotor with reactive ceramics.The rise in temperatures of the quartz glass and materials constituting the cylindrical rotor in a unit time were evaluated with Eq. (3). T = net heat / (1000 x ρ x C x µ) (3) The net heat was estimated from conduction of heat from/to neighbor materials, radiation loss, heat transfer by Ar gas and irradiation of infrared image lamps. The parameters of the density, specific heat, thick, and thermal conductivity for the materials employed to fabricate the solar furnace are summ

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