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SCIENCE CHINA Technological Sciences, Volume 61 , Issue 12 : 1788-1801(2018) https://doi.org/10.1007/s11431-018-9294-y

Radiative heat transfer and thermal characteristics of Fe-based oxides coated SiC and Alumina RPC structures as integrated solar thermochemical reactor

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  • ReceivedApr 5, 2018
  • AcceptedMay 28, 2018
  • PublishedNov 19, 2018

Abstract

This paper investigated radiative heat transfer and thermal characteristics of Fe-based oxides coated SiC and Alumina reticulated porous ceramic structures as integrated solar thermochemical reactor. High-flux solar radiation absorption and axial temperature distribution in the ceramic foams reactor were analyzed by adopting surface-to-surface radiation model coupled to the P1 approximation for radiation heat transfer. The radiative heat transfer and thermal characteristics of different foam-type RPC structures, including SiC, CeO2, FeAl2O4, NiFeAlO4, Fe3O4/SiC, and NiFe2O4/SiC were evaluated. The mass flow rate and foam structural parameters, including the permeability, pore mean cell size, and extinction coefficients have significantly affected the axial temperature distribution, pressure drop, heat transfer, and fluid flow. Integrated porous structure to the solar receiver could maximize the incorporation of redox powder in the reacting medium, lower the pressure drop, and enhance the thermal performance of the thermochemical reacting system. SiC structure was the candidate materials in the case where more heat flux and high axial temperature distribution is needed. However, Fe-based oxide coated Al2O3 structure could be considered regarding the heat transfer enhancement along with the catalyst activity of oxygen carriers for solar thermochemical reacting system performance.


Funded by

the National Natural Science Foundation of China(Grant,Nos.,51522601,51436009)

and the Fok Ying-Tong Education Foundation of China(Grant,No.,141055)


Acknowledgment

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51522601, 51436009), and the Fok Ying-Tong Education Foundation of China (Grant No. 141055).


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  • Figure 1

    (Color online) Schematic diagram of the porous media solar thermochemical reactor.

  • Figure 2

    (Color online) Fe-based oxide coated SiC and Alumina RPC structures as integrated solar thermochemical reactor. (a) Fe3O4/SiC; (b) SiC; (c) NiFe2O4/SiC; (d) NiFeAlO4; (e) Al3O4; (f) FeAl2O4; (g) schematic diagram of porous integrated solar thermochemical reactor.

  • Figure 3

    (Color online) Temperature distribution in the porous medium compared to that of Chen et al. [35].

  • Figure 4

    (Color online) Qualitative temperature distribution of SiC porous medium solar receiver at 50 kW/m2 of diffuse irradiance, 1 atm, and 16×10−5 kg/s of mass flow rate. (a) Surface temperature at the XY plane; (b) surface temperature at the ZX plane; (c) surface temperature at the ZY plane.

  • Figure 5

    (Color online) Thermal characteristics of porous integrated material at 1 atm and 16×10−5 kg/s. (a) Temperature distribution in the porous medium at 30 kW/m2 of diffuse irradiance; (b) weighted average temperature in the porous medium as a function of diffuse irradiance; (c) temperature predicted as a function of porosity length; (d)–(f) effects of Al2O3 and SiC supported Fe-based oxide integrated porous materials.

  • Figure 6

    (Color online) Surface radiosity and incident radiation in participating media at 30 kW/m2 of diffuse irradiance, 1 atm, and 16×10−5 kg/s. (a) Surface radiosity; (b) mutual surface irradiation and Gauss point evaluation; (c) incident radiation distribution in the participating media.

  • Figure 7

    (Color online) High-temperature radiative characteristics in the participating media. (a) Incident radiation distribution in the participating media at 30 kW/m2 of diffuse irradiance; (b) average convective heat flux; (c) average conductive heat flux; (d) average total radiative heat flux; (e) effective volumetric heat capacity in the porous medium at 30 kW/m2 of diffuse irradiance; (f) effect of Al2O3 and SiC supported NiFe and Fe-based oxide integrated porous materials.

  • Figure 8

    (Color online) Qualitative effect of mass flow rate on the temperature distribution in the SiC porous media at 30 kW/m2 of diffuse irradiance and 1 atm. (a) 4×10−5 kg/s of mass flow rate; (b) 1.2×10−4 kg/s of mass flow rate; (c) 2×10−4 kg/s of mass flow rate.

  • Figure 9

    (Color online) Effect of mass flow rate on the thermal performance in the participating medium at 30 kW/m2 of diffuse irradiance and 1 atm. (a) Temperature distribution in SiC porous structure; (b) temperature distribution in FeAl2O4 porous structure; (c) average pressure drop; (d) average radiative energy flux.

  • Figure 10

    (Color online) Effect of permeability coefficient on the fluid flow and pressure drop at 30 kW/m2 of diffuse irradiance and 20×10−5 kg/s of mass flow rate. (a) Pressure distribution at k=1×10−12 m2; (b) pressure drop; (c) effect of permeability on convective heat flux; (d) effect of permeability on conductive heat flux.

  • Figure 11

    (Color online) Effects of pore mean cell size and extinction coefficient on the thermal performance of porous medium. (a)–(b) Temperature distribution in the presence of SiC and FeAl2O4 porous structure, respectively; (c) temperature difference as a function of pore mean cell size; (d) average convective heat flux in the medium; (e) conductive heat flux in the medium; (f) average total radiative energy flux in the medium; (g) conductive and convective heat flux correlations in the porous medium.

  • Table 1   Boundary conditions and initial conditions

    Boundary fields

    Temperature

    Velocity

    Inlet

    293.15 K

    Mass flow rate (kg/s)

    Quartz glass

    Idiff (W/m2)

    0

    Wall

    293.15 K

    u/n=0

    Initial values

    293.15 K

    0

    External boundary

    q0=h·(TambT)

    0

    Outlet

    T/n=0

    p0=0 Pa

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