Second Law Analysis

Second Law Analysis - Second Law Analysis A second law...

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Second Law Analysis A second law analysis of the two-step thermo-chemical process to split water and CO 2 is performed to assess its ability to convert solar energy into chemical energy in the form of gaseous hydrogen or carbonmonoxide. Fig. Flow diagram of two-step thermochemical cycle for water splitting using steam for the reoxidation of ceria Fig. 1 shows the flow diagram of the process using steam as the hydrolyzing agent. Fig. 2 shows the same process using CO 2 for the oxidation of the reduced ceria. The diagram for water splitting consists of a solar reactor, a hydrolyzer, a fuel cell and cooling and heating stages. In case of CO 2 - splitting, the hydrolyzer is replaced by a CO 2 -reducer. Both processes are assumed to operate at a constant pressure of 1 bar. Pressure drops throughout the system which will occur in practice are neglected. The solar receiver is assumed to be a black-body receiver without any convection or conduction heat losses. Potential as well as kinetic energies are neglected in the calculations. A constant power incident on the solar receiver defines the molar flow rate of the reactants. Since the ceria does not change its phase during oxidation and reduction, a circulation of particles is not necessary and both the ther Fig. Flow diagram of two-step thermochemical cycle for CO 2 -splitting using CO 2 for the reoxidation of ceria mal dissociation as well as the hydrolysis/CO 2 -splitting take place in the same reactor. The exergy analysis follows the approach of A. Steinfeld in Int. J. of Hydrogen Energy, 2002, 27, 611-619. Thermodynamic properties were calculated
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This note was uploaded on 01/03/2012 for the course CH 242a taught by Professor List during the Fall '10 term at Caltech.

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Second Law Analysis - Second Law Analysis A second law...

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