The Experts below are selected from a list of 183 Experts worldwide ranked by ideXlab platform

Zeshao Chen - One of the best experts on this subject based on the ideXlab platform.

  • The Design of Beam Splitter for Two-Stage Reflective Spectral Beam Splitting Concentrating PV/Thermal System
    2011 Asia-Pacific Power and Energy Engineering Conference, 2011
    Co-Authors: Shouli Jiang, Gang Wang, Peng Hu, Zeshao Chen
    Abstract:

    The design method of the spectral beam filter, which is employed in the solar Concentrating System to improve solar energy utilization and electronic conversion efficiency, is presented. The layer stack is designed by using the needle optimization technique to match the spectrum range of silicon photovoltaic (PV) solar cells, and the reflection film materials are Nb2O5 and SiO2. The coating is performed by employing a sputtering apparatus and the spectral reflectivity of the beam splitter is measured by the spectrophotometer. The test results show good agreement with the designed spectral reflectivity. The spectral distribution of energy flux density of the two-stage reflective spectral beam splitting Concentrating PV/Thermal System is also calculated. It shows that almost all the invalid radiation energy for PV conversion is filtered for thermal conversion.

  • optical modeling for a two stage parabolic trough Concentrating photovoltaic thermal System using spectral beam splitting technology
    Solar Energy Materials and Solar Cells, 2010
    Co-Authors: Shouli Jiang, Peng Hu, Songping Mo, Zeshao Chen
    Abstract:

    Abstract A two-stage parabolic trough Concentrating photovoltaic/thermal (PV/T) System is described, which contains a concentrator, a spectral beam splitting filter, an evacuated collector tube and the solar cell components. The nondimensional optical model with the focal length of the concentrator as the characteristic length has been developed to analyze the properties of the Concentrating System using the beam splitting filter. The geometry concentration ratio and the size of solar image at different structure parameters have been obtained. Based on the ray tracing algorithms, a detailed three-dimensional model is set up to evaluate the local radiation flux density distribution on the elements’ surfaces. And the effects of the solar brightness distribution and optical errors (e.g., alignment error and tracking error) are also involved. Furthermore, the spectral distribution of the solar radiation is illustrated with the beam splitting filter, which has been specially designed using the needle optimization method. It is shown that using the filter the heat load of the cell can be reduced by 20.7%, up to 10.5% of the total incident solar energy can be recovery by the receiver, and the overall optical efficiency in theory is about 0.764.

Gilles Flamant - One of the best experts on this subject based on the ideXlab platform.

  • influence of receiver surface spectral selectivity on the solar to electric efficiency of a solar tower power plant
    Solar Energy, 2016
    Co-Authors: Florent Larrouturou, Cyril Caliot, Gilles Flamant
    Abstract:

    Abstract The spectral selectivity results in increasing the absorption of the incident solar flux and decreasing the radiative losses due to emission of heated walls. This study investigates the influence of the spectral selectivity on power generation efficiency of a central receiver solar Concentrating System (solar power tower). A parametric study is conducted to quantify the potential efficiency gain that may result from spectral selectivity with the solar absorption, the cutoff wavelength, the infrared emissivity, the wall temperature and the receiver geometry (plane or cavity) as parameters. The model used to compute the receiver efficiency is based on a Monte Carlo ray-tracing algorithm for the radiative losses, the Clausing model for the convective losses and the Chambadal–Novikov–Curzon–Ahlborn approach for thermodynamic efficiency. The two tested receiver geometries are a plane receiver and a cubic cavity having the same cross section area of the aperture. State-of-the-art (metal alloys) and promising ceramic materials were studied such as SiC, ZrB2, ZrC and TaC. In the latter cases the native measured optical properties of carbides are considered. Finally, an intrinsic spectrally selective material such as TaC demonstrates promising results with global facility efficiency close to the maximum when solar absorptivity is enhanced by microstructuration, for example. As a conclusion, it is shown that spectral selectivity may result in an increase of overall solar power plant efficiency by about 6% (or 28% in relative value) with current state-of-the-art.

Shouli Jiang - One of the best experts on this subject based on the ideXlab platform.

  • The Design of Beam Splitter for Two-Stage Reflective Spectral Beam Splitting Concentrating PV/Thermal System
    2011 Asia-Pacific Power and Energy Engineering Conference, 2011
    Co-Authors: Shouli Jiang, Gang Wang, Peng Hu, Zeshao Chen
    Abstract:

    The design method of the spectral beam filter, which is employed in the solar Concentrating System to improve solar energy utilization and electronic conversion efficiency, is presented. The layer stack is designed by using the needle optimization technique to match the spectrum range of silicon photovoltaic (PV) solar cells, and the reflection film materials are Nb2O5 and SiO2. The coating is performed by employing a sputtering apparatus and the spectral reflectivity of the beam splitter is measured by the spectrophotometer. The test results show good agreement with the designed spectral reflectivity. The spectral distribution of energy flux density of the two-stage reflective spectral beam splitting Concentrating PV/Thermal System is also calculated. It shows that almost all the invalid radiation energy for PV conversion is filtered for thermal conversion.

  • optical modeling for a two stage parabolic trough Concentrating photovoltaic thermal System using spectral beam splitting technology
    Solar Energy Materials and Solar Cells, 2010
    Co-Authors: Shouli Jiang, Peng Hu, Songping Mo, Zeshao Chen
    Abstract:

    Abstract A two-stage parabolic trough Concentrating photovoltaic/thermal (PV/T) System is described, which contains a concentrator, a spectral beam splitting filter, an evacuated collector tube and the solar cell components. The nondimensional optical model with the focal length of the concentrator as the characteristic length has been developed to analyze the properties of the Concentrating System using the beam splitting filter. The geometry concentration ratio and the size of solar image at different structure parameters have been obtained. Based on the ray tracing algorithms, a detailed three-dimensional model is set up to evaluate the local radiation flux density distribution on the elements’ surfaces. And the effects of the solar brightness distribution and optical errors (e.g., alignment error and tracking error) are also involved. Furthermore, the spectral distribution of the solar radiation is illustrated with the beam splitting filter, which has been specially designed using the needle optimization method. It is shown that using the filter the heat load of the cell can be reduced by 20.7%, up to 10.5% of the total incident solar energy can be recovery by the receiver, and the overall optical efficiency in theory is about 0.764.

Florent Larrouturou - One of the best experts on this subject based on the ideXlab platform.

  • influence of receiver surface spectral selectivity on the solar to electric efficiency of a solar tower power plant
    Solar Energy, 2016
    Co-Authors: Florent Larrouturou, Cyril Caliot, Gilles Flamant
    Abstract:

    Abstract The spectral selectivity results in increasing the absorption of the incident solar flux and decreasing the radiative losses due to emission of heated walls. This study investigates the influence of the spectral selectivity on power generation efficiency of a central receiver solar Concentrating System (solar power tower). A parametric study is conducted to quantify the potential efficiency gain that may result from spectral selectivity with the solar absorption, the cutoff wavelength, the infrared emissivity, the wall temperature and the receiver geometry (plane or cavity) as parameters. The model used to compute the receiver efficiency is based on a Monte Carlo ray-tracing algorithm for the radiative losses, the Clausing model for the convective losses and the Chambadal–Novikov–Curzon–Ahlborn approach for thermodynamic efficiency. The two tested receiver geometries are a plane receiver and a cubic cavity having the same cross section area of the aperture. State-of-the-art (metal alloys) and promising ceramic materials were studied such as SiC, ZrB2, ZrC and TaC. In the latter cases the native measured optical properties of carbides are considered. Finally, an intrinsic spectrally selective material such as TaC demonstrates promising results with global facility efficiency close to the maximum when solar absorptivity is enhanced by microstructuration, for example. As a conclusion, it is shown that spectral selectivity may result in an increase of overall solar power plant efficiency by about 6% (or 28% in relative value) with current state-of-the-art.

Peng Hu - One of the best experts on this subject based on the ideXlab platform.

  • The Design of Beam Splitter for Two-Stage Reflective Spectral Beam Splitting Concentrating PV/Thermal System
    2011 Asia-Pacific Power and Energy Engineering Conference, 2011
    Co-Authors: Shouli Jiang, Gang Wang, Peng Hu, Zeshao Chen
    Abstract:

    The design method of the spectral beam filter, which is employed in the solar Concentrating System to improve solar energy utilization and electronic conversion efficiency, is presented. The layer stack is designed by using the needle optimization technique to match the spectrum range of silicon photovoltaic (PV) solar cells, and the reflection film materials are Nb2O5 and SiO2. The coating is performed by employing a sputtering apparatus and the spectral reflectivity of the beam splitter is measured by the spectrophotometer. The test results show good agreement with the designed spectral reflectivity. The spectral distribution of energy flux density of the two-stage reflective spectral beam splitting Concentrating PV/Thermal System is also calculated. It shows that almost all the invalid radiation energy for PV conversion is filtered for thermal conversion.

  • optical modeling for a two stage parabolic trough Concentrating photovoltaic thermal System using spectral beam splitting technology
    Solar Energy Materials and Solar Cells, 2010
    Co-Authors: Shouli Jiang, Peng Hu, Songping Mo, Zeshao Chen
    Abstract:

    Abstract A two-stage parabolic trough Concentrating photovoltaic/thermal (PV/T) System is described, which contains a concentrator, a spectral beam splitting filter, an evacuated collector tube and the solar cell components. The nondimensional optical model with the focal length of the concentrator as the characteristic length has been developed to analyze the properties of the Concentrating System using the beam splitting filter. The geometry concentration ratio and the size of solar image at different structure parameters have been obtained. Based on the ray tracing algorithms, a detailed three-dimensional model is set up to evaluate the local radiation flux density distribution on the elements’ surfaces. And the effects of the solar brightness distribution and optical errors (e.g., alignment error and tracking error) are also involved. Furthermore, the spectral distribution of the solar radiation is illustrated with the beam splitting filter, which has been specially designed using the needle optimization method. It is shown that using the filter the heat load of the cell can be reduced by 20.7%, up to 10.5% of the total incident solar energy can be recovery by the receiver, and the overall optical efficiency in theory is about 0.764.