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Ali Radwan - One of the best experts on this subject based on the ideXlab platform.

  • An Investigation of a Novel Structure Polycrystalline Silicon Solar Cell for Concentrated Solar Power
    ASME 2017 11th International Conference on Energy Sustainability, 2017
    Co-Authors: Ali Radwan, Mohamed Emam, Radwan M. El-zoheiry, Mahmoud Ahmed
    Abstract:

    To achieve reliable and efficient operation of generic polycrystalline silicon Solar Cell under concentrated sunlight, a novel structure of the Cell layers is proposed along with effective cooling technique using microchannel heat sink (MCHS). In the novel structure, Boron Nitride with the volume fraction of 20%, 40%, and 60% as a filler is incorporated in the Ethylene Vinyl Acetate (EVA) matrix to form a new composite. The new composite is used instead of the Conventional EVA layer in the Solar Cell. Various Solar Cell structures integrated with MCHS are studied and compared with the Conventional structure. To determine the performance of the developed concentrated photovoltaic thermal (CPVT) system, a comprehensive three-dimensional model of the Solar Cell with heat sink is developed. The model is numerically simulated and validated. Based on the validated results, it is found that the novel structure with EVA-60% BN composite along with aluminum foil back sheet attains 30% increase in the gained Solar Cell electric power with 10.9 % reduction in the Cell temperature compared with the Conventional Solar Cell structure at the same cooling mass flow rate of 50 g/min and concentration ratio of 20. However at CR = 20, Vw = 1m/s and Ta = 30°C a significant damage of the Conventional Solar Cell structure will occurs if no effective cooling technique is used. Moreover, the developed design of Solar Cell achieves a higher CPVT-system thermal efficiency compared with the Conventional one.

  • Performance evaluation of new modified low-concentrator polycrystalline silicon photovoltaic/thermal systems
    Energy Conversion and Management, 2017
    Co-Authors: Mahmoud Ahmed, Ali Radwan
    Abstract:

    Abstract A modified polycrystalline silicon Solar Cell structure is introduced to enhance the heat dissipation process from the Cell’s silicon layer. The modification involves two steps. First, the Ethylene-Vinyl Acetate (EVA) layer underneath the silicon wafer of a Conventional Solar Cell is replaced with a nanocomposite layer that includes an EVA matrix doped with Boron Nitride (BN) nanoparticles at different loading ratios of 20, 40, and 60%. Second, the Tedlar Polyester Tedlar (TPT) layer is substituted with a high thermal conductivity aluminum backing foil layer. To assess the enhancements to the modified Solar Cell in comparison to the Conventional Cell, a three-dimensional thermo-fluid model is developed. The model is numerically simulated and the results are validated with the available experimental, numerical, and analytical results. The findings reveal that at a concentration ratio up to 3.5 where no external cooling technique is used, the modified Cell attains a slight reduction in Solar Cell temperature compared to the Conventional Cell. On the other hand, at a concentration ratio of 20, where the Solar Cell is integrated with a microchannel heat sink, a significant reduction of Cell temperature is observed compared to the Conventional Cell. It is found that at a concentration ratio of 20, and a coolant mass rate of 100 g/min, the maximum temperature of the modified Cell with 60% BN and an aluminum back sheet is 66 °C, while the Conventional Solar Cell temperature is 108 °C. Additionally, of the two Cells, the modified Solar Cell produces the highest net power of 45 W, and achieves the highest electrical and thermal efficiency of 17.5%, and 70.8%, respectively. Meanwhile, the Conventional Solar Cell produces 34 W, and attains an electrical and thermal efficiency of 13.5%, and 69%, respectively. These findings can guide designers in the industrial field to adopt this type of modified Solar Cell to improve the performance of low concentrator photovoltaic systems.

Khaleel Al Khasawneh - One of the best experts on this subject based on the ideXlab platform.

  • Integrating Transparent and Conventional Solar Cells TSC/SC
    Sustainability, 2020
    Co-Authors: Mohâd Al-nimr, Abdallah Milhem, Basel Al-bishawi, Khaleel Al Khasawneh
    Abstract:

    Conventional photovoltaic Cells are able to convert the visible light spectrum of Solar radiation into electricity; the unused wavelengths of the Solar radiation spectrum are dissipated as heat in the system. On the other hand, certain types of transparent Solar Cells are able to utilize the rest of the Solar radiation spectrum. The integration of transparent Solar Cells with Conventional photovoltaic Cells enables the system to absorb and utilize both wavelengths of the Solar radiation spectrum. In this paper, two models for integrating transparent Solar Cells with Conventional photovoltaic Cells are proposed, simulated, and analyzed theoretically. ANSYS software was used to obtain the results for the proposed models. It is an initial theoretical study that shows some first results; it is almost a work in progress. The results showed that the highest efficiency was for the model that had two cooling spaces. The efficiency was increased as the ambient air temperature decreased and the mass flow rate increased. The percentage drop in photovoltaic (PV) Cell efficiency decreased as the mass flow rate increased and the ambient temperature decreased, and it had the lowest value when air/water was used for cooling. The efficiency of the transparent Solar Cell (TSC) increased as the transparency decreased; in order to have higher efficiency, PV efficiency should be high, with low transparency. When added, the transparent Solar Cell was supposed to increase the harvested energy due to the utilization of the unconverted Solar radiation, but it left two negative side effects. The first negative side effect was the reduction of the transmitted radiation to the Conventional Solar Cell due to the transmissivity of the transparent Cell. The second negative impact was the increase in the Conventional Cell temperature due to the additional thermal resistance, which reduced the effectiveness of cooling the Cell from above. The proposed models were verified by comparing the results of the standalone PV that were available in the literature with the two models that are proposed in this paper.

Jae-hyung Jang - One of the best experts on this subject based on the ideXlab platform.

Mahmoud Ahmed - One of the best experts on this subject based on the ideXlab platform.

  • An Investigation of a Novel Structure Polycrystalline Silicon Solar Cell for Concentrated Solar Power
    ASME 2017 11th International Conference on Energy Sustainability, 2017
    Co-Authors: Ali Radwan, Mohamed Emam, Radwan M. El-zoheiry, Mahmoud Ahmed
    Abstract:

    To achieve reliable and efficient operation of generic polycrystalline silicon Solar Cell under concentrated sunlight, a novel structure of the Cell layers is proposed along with effective cooling technique using microchannel heat sink (MCHS). In the novel structure, Boron Nitride with the volume fraction of 20%, 40%, and 60% as a filler is incorporated in the Ethylene Vinyl Acetate (EVA) matrix to form a new composite. The new composite is used instead of the Conventional EVA layer in the Solar Cell. Various Solar Cell structures integrated with MCHS are studied and compared with the Conventional structure. To determine the performance of the developed concentrated photovoltaic thermal (CPVT) system, a comprehensive three-dimensional model of the Solar Cell with heat sink is developed. The model is numerically simulated and validated. Based on the validated results, it is found that the novel structure with EVA-60% BN composite along with aluminum foil back sheet attains 30% increase in the gained Solar Cell electric power with 10.9 % reduction in the Cell temperature compared with the Conventional Solar Cell structure at the same cooling mass flow rate of 50 g/min and concentration ratio of 20. However at CR = 20, Vw = 1m/s and Ta = 30°C a significant damage of the Conventional Solar Cell structure will occurs if no effective cooling technique is used. Moreover, the developed design of Solar Cell achieves a higher CPVT-system thermal efficiency compared with the Conventional one.

  • Performance evaluation of new modified low-concentrator polycrystalline silicon photovoltaic/thermal systems
    Energy Conversion and Management, 2017
    Co-Authors: Mahmoud Ahmed, Ali Radwan
    Abstract:

    Abstract A modified polycrystalline silicon Solar Cell structure is introduced to enhance the heat dissipation process from the Cell’s silicon layer. The modification involves two steps. First, the Ethylene-Vinyl Acetate (EVA) layer underneath the silicon wafer of a Conventional Solar Cell is replaced with a nanocomposite layer that includes an EVA matrix doped with Boron Nitride (BN) nanoparticles at different loading ratios of 20, 40, and 60%. Second, the Tedlar Polyester Tedlar (TPT) layer is substituted with a high thermal conductivity aluminum backing foil layer. To assess the enhancements to the modified Solar Cell in comparison to the Conventional Cell, a three-dimensional thermo-fluid model is developed. The model is numerically simulated and the results are validated with the available experimental, numerical, and analytical results. The findings reveal that at a concentration ratio up to 3.5 where no external cooling technique is used, the modified Cell attains a slight reduction in Solar Cell temperature compared to the Conventional Cell. On the other hand, at a concentration ratio of 20, where the Solar Cell is integrated with a microchannel heat sink, a significant reduction of Cell temperature is observed compared to the Conventional Cell. It is found that at a concentration ratio of 20, and a coolant mass rate of 100 g/min, the maximum temperature of the modified Cell with 60% BN and an aluminum back sheet is 66 °C, while the Conventional Solar Cell temperature is 108 °C. Additionally, of the two Cells, the modified Solar Cell produces the highest net power of 45 W, and achieves the highest electrical and thermal efficiency of 17.5%, and 70.8%, respectively. Meanwhile, the Conventional Solar Cell produces 34 W, and attains an electrical and thermal efficiency of 13.5%, and 69%, respectively. These findings can guide designers in the industrial field to adopt this type of modified Solar Cell to improve the performance of low concentrator photovoltaic systems.

Kai Wang - One of the best experts on this subject based on the ideXlab platform.

  • Integrated energy storage and electrochromic function in one flexible device: An energy storage smart window
    Energy and Environmental Science, 2012
    Co-Authors: Kai Wang, Yuena Meng, Haiping Wu, Yajie Zhang, Zhixiang Wei
    Abstract:

    In this paper{,} a new integrated multifunctional flexible device called the Energy Storage Smart Window (ESS window) was designed and fabricated. The proposed ESS window comprises an integrated supercapacitor and electrochromism function in one flexible device using ordered polyaniline nanowire arrays as electrodes. The ESS window showed high areal capacitance and high stability as a supercapacitor{,} and in situ optical measurements proved its electrochromic function. Furthermore{,} the ESS window can be integrated with a Conventional Solar Cell to form a smart device system{,} which can simultaneously harvest{,} store{,} and use renewable energy efficiently.

  • direct growth of highly mismatched type ii zno znse core shell nanowire arrays on transparent conducting oxide substrates for Solar Cell applications
    Advanced Materials, 2008
    Co-Authors: Kai Wang, Jiajun Chen, Weilie Zhou, Yong Zhang, John Pern, A Mascarenhas
    Abstract:

    A number of nanometer-scale photovoltaic (PV) concepts based on semiconductor nanowires have been developed or proposed in recent years, with either inorganic/organic hybrid or all-inorganic approaches. The quasi-one-dimensional (quasi-1D) structure is perhaps the optimized choice for optoelectronic devices such as Solar Cells and photodetectors, because it allows for maximal advantage to be taken of reduced dimensionality whilst retaining the last and only needed conduction channel. Besides the possibility of exploring quantum effects at the nanoscopic scale, the quasi-1D system could be superior to the bulk material even at the mesoscopic scale, where the lateral size falls below the carrier diffusion length, for instance, by reducing the nonradiative recombination and carrier scattering loss through elimination of the unnecessary lateral transport and the resulting recombination loss. Additionally, a nanowire array constitutes a natural architecture, such as a photonic crystal, for light trapping. The charge separation of the electron and hole is a key step in the generation of Solar power in a PV device. In a Conventional Solar Cell, it is typically achieved by a planar p–n homojunction along the path of the current flow or longitudinally. In nanometer-architecture PV devices, however, the charge separation is often facilitated by a type II or staggered energy alignment of a heterojunction, constructed from two materials for which both the valance and conduction bands of one component lie lower in energy than the corresponding bands of the other component. Such heterojunctions have been intensively investigated for Solar Cell applications, including dyesensitized Solar Cells (DSSCs), quantum-dot-sensitized Solar