Numerical analysis of hydrogen production via methane steam reforming in porous media solar thermochemical reactor using concentrated solar irradiation as heat source

Modelling of solar thermochemical reaction systems

“…Thus, one energy conservation equation (15) is solved for each phase. The use of local thermal non-equilibrium (LTNE) appears widely in the literature when using homogenisation Belghit, 2011a, 2011b;Groehn et al, 2016;Kenarsari and Zheng, 2014;Villafán-Vidales et al, 2011;Wang et al, 2014a;Wang et al, 2014b;Zedtwitz et al, 2007;Zedtwitz and Steinfeld, 2005) or when the phases are resolved individually (Abanades et al, 2007;Oles and Jackson, 2015), though there are examples of high solid fraction studies in fixed beds where the single temperature-or local thermal equilibrium (LTE)-assumption is made (Lapp et al, 2013;Lapp and Lipiń ski, 2014;Lu et al, 2016;Martinek et al, 2014). The approximation of LTE is valid when any local temperature differences between a fluid and a solid are much smaller than the temperature differences that appear in the whole system.…”

“…Studies such as (Keene et al, 2013;Lipiń ski and Steinfeld, 2004;Yue and Lipiń ski, 2015a,b,c) deal with the nonlinear temperature dependence of enthalpy by including the temperature dependence implicitly which allows for a natural inclusion of the enthalpy of formation when solving for the energy of individual gas and solid components. The use of a temperature dependent specific heat times a temperature in place of an enthalpy was used in (Gordillo and Belghit, 2011a;Lapp and Lipiń ski, 2014;Wang et al, 2014b) among others. Enthalpy of formation may also appear as a source term in the energy balance equation when considering a single-phase equation only.…”

“…The temperature dependence of reaction rates is generally handled by assuming an Arrhenius-type law (see Section 3.2): Lipiń ski, 2012, 2011;Haussener et al, 2009;Lipiń ski and Steinfeld, 2004;Müller et al, 2008;Oles and Jackson, 2015;Schunk et al, 2009b;2009a;Villafán-Vidales et al, 2015;Yue and Lipiń ski, 2015a,b,c;Zedtwitz et al, 2007;Zedtwitz and Steinfeld, 2005). Fluid density, specific heat and thermal conductivity can all also be strong functions of temperature, particularly for gasses; inclusion of these effects can be found, for example, in (Kenarsari and Zheng, 2014;Lu et al, 2016;Müller et al, 2008;Wang et al, 2014b).…”

Performance of a combined cooling heating and power system with mid-and-low temperature solar thermal energy and methanol decomposition integration

“…Using concentrated solar power, natural gas and other carbonaceous materials as reducing agents for the solar thermochemical hydrogen production. Wang et al [13] numerically studied the hydrogen production via the methane steam reforming in porous media solar thermochemical reactors using the concentrated solar irradiation as a heat source. Villasmil and Steinfeld [14] carried out thermodynamic and economic analyses to evaluate hydrogen sulfide splitting using concentrated solar energy.…”

Design and calculation of a new storage tank for concentrating solar power plant

“…Unlike fossil fuel, CSP plant uses the sun as thermal heat source and ultimately generates electricity. The three main types of CSP plants are parabolic trough, power tower, and dish Stirling engine systems [1][2][3][4][5]. Thermal energy storage (TES) is a distinguishing constitution for CSP plant due to enable continuous or alternative operation which includes the latent heat storage and sensible heat storage.…”