The Experts below are selected from a list of 240 Experts worldwide ranked by ideXlab platform
Tetsuyuki Ishii - One of the best experts on this subject based on the ideXlab platform.
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A Methodology for Estimating the Effect of Solar Spectrum on Photovoltaic Module Performance by Using Average Photon Energy and a Water Absorption Band
Japanese Journal of Applied Physics, 2012Co-Authors: Tetsuyuki Ishii, Kenji Otani, Akihiko Itagaki, Kenji UtsunomiyaAbstract:Various photovoltaic (PV) technologies are commercially available today. The effect of Solar Spectrum on the performance of PV modules should be evaluated quantitatively in order to estimate the module performance with high accuracy and precision. Average photon energy (APE) has been frequently applied to evaluate the effect of Solar Spectrum. The purpose of this study is to enhance the precision and accuracy by introducing other indexes. In this study, we select Solar spectra, the integrated spectral irradiance (ISI) and APE of which are equivalent to those of the standard AM1.5G Spectrum. There is a slight difference in shape, although the shapes are approximately similar. We introduce one more index, which defines the spectral irradiance at the atmospheric window or the depth of the water absorption band. The introduction would further improve the accuracy and precision of the evaluation of the effect of Solar Spectrum.
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effects of Solar Spectrum and module temperature on outdoor performance of photovoltaic modules in round robin measurements in japan
Progress in Photovoltaics, 2011Co-Authors: Tetsuyuki Ishii, Kenji Otani, Takumi TakashimaAbstract:The performance of six photovoltaic (PV) modules composed of polycrystalline silicon (pc-Si), amorphous silicon (a-Si), and hydrogenated amorphous silicon/crystalline silicon (a-Si:H/c-Si) modules was investigated at eight locations in Japan from August 2007 to December 2008. In addition, Solar irradiance, Solar Spectrum, and module temperature were simultaneously measured in these round-robin measurements. In this study, we evaluate quantitatively the effects of module temperature and Solar Spectrum on the performance of the PV modules as thermal factor (TF) and spectral factor (SF), respectively. Furthermore, we investigate the variation in module performance, which is converted into module performance under standard test conditions (STC) using the TF and SF. In the case of the pc-Si modules, the variations in performance ratio under STC (PRSTC) for these modules range from 0.056 to 0.074 through the round-robin measurements. The TF indicates that the contribution of module temperature to the variation in performance is large, between about 15 and 20%. However, the SF suggests that the contribution of Solar Spectrum is quite small, less than 3%. In the case of the a-Si modules, the contribution of module temperature is about 8%. The performance is largely influenced by Solar Spectrum, more than 12% at its maximum. Consequently, the variations in the corrected PRSTC of the a-Si modules are between 0.117 and 0.141. These large variations may result from the effects of thermal annealing and light soaking. The variation in PRSTC of the a-Si:H/c-Si module is similar to that of the pc-Si modules. Copyright © 2010 John Wiley & Sons, Ltd.
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Effects of Solar Spectrum and module temperature on outdoor performance of photovoltaic modules in round‐robin measurements in Japan
Progress in Photovoltaics, 2010Co-Authors: Tetsuyuki Ishii, Kenji Otani, Takumi TakashimaAbstract:The performance of six photovoltaic (PV) modules composed of polycrystalline silicon (pc-Si), amorphous silicon (a-Si), and hydrogenated amorphous silicon/crystalline silicon (a-Si:H/c-Si) modules was investigated at eight locations in Japan from August 2007 to December 2008. In addition, Solar irradiance, Solar Spectrum, and module temperature were simultaneously measured in these round-robin measurements. In this study, we evaluate quantitatively the effects of module temperature and Solar Spectrum on the performance of the PV modules as thermal factor (TF) and spectral factor (SF), respectively. Furthermore, we investigate the variation in module performance, which is converted into module performance under standard test conditions (STC) using the TF and SF. In the case of the pc-Si modules, the variations in performance ratio under STC (PRSTC) for these modules range from 0.056 to 0.074 through the round-robin measurements. The TF indicates that the contribution of module temperature to the variation in performance is large, between about 15 and 20%. However, the SF suggests that the contribution of Solar Spectrum is quite small, less than 3%. In the case of the a-Si modules, the contribution of module temperature is about 8%. The performance is largely influenced by Solar Spectrum, more than 12% at its maximum. Consequently, the variations in the corrected PRSTC of the a-Si modules are between 0.117 and 0.141. These large variations may result from the effects of thermal annealing and light soaking. The variation in PRSTC of the a-Si:H/c-Si module is similar to that of the pc-Si modules. Copyright © 2010 John Wiley & Sons, Ltd.
Takashi Minemoto - One of the best experts on this subject based on the ideXlab platform.
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Impact of average photon-energy coefficient of Solar Spectrum on the short circuit current of photovoltaic modules
Current Applied Physics, 2017Co-Authors: Yuhei Horio, Yurei Imai, Yoshihiro Hishikawa, Md. Mijanur Rahman, Takashi MinemotoAbstract:The output energy of photovoltaic (PV) modules is influenced by the spectral irradiance distribution of the Solar Spectrum under outdoor conditions. To rate the precise output energy of PV modules, the correction of short circuit current (ISC) based on actual environmental conditions is needed, because ISCsignificantly depends on the shape of the spectral irradiance distribution. The average photon energy (APE) is a zero-dimensional index for spectral irradiance distribution, and APE value uniquely describes the shape of a Solar Spectrum. Thus, APE has an impact on ISCof PV modules. In this contribution, the relationship between APE coefficient and ISCof the multi-crystalline silicon, single-crystalline silicon, heterojunction intrinsic thin-layer, back contact, copper indium selenide and cadmium telluride PV modules has explored. It is revealed that APE value changes the ISCof PV modules which appeared to have immense possibilities of ISCcorrection using APE coefficient. This new approach can be very effective for precise rating the output energy of PV modules under actual outdoor conditions.
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Evaluation of Solar spectral irradiance distribution using an index from a limited range of the Solar Spectrum
Current Applied Physics, 2014Co-Authors: Naoya Kataoka, Shota Yoshida, Seiya Ueno, Takashi MinemotoAbstract:Abstract The output energy of photovoltaic (PV) modules under outdoor conditions is greatly influenced by the spectral irradiance distribution of the Solar Spectrum. To analyze this effect on PV modules, the spectral irradiance distribution, which is one-dimensional data, has to be represented by a zero-dimensional index. The average photon energy (APE) is an index for spectral irradiance distributions, which represents the average energy per photon in a Spectrum. We have previously analyzed the uniqueness of the shape of the Solar Spectrum in the wavelength range of 350–1050 nm, and one corresponding value of APE showed a specific shape of spectral irradiance distribution. In this study, new indexes were calculated for a limited wavelength range of 350–750 nm and multiple bands of 450–500 nm and 800–850 nm of the Solar Spectrum for easy measurement and calculation. The result shows the uniqueness of new indexes to the shape of measured Solar Spectrum and the standard deviations were found to be quite small. This indicates that the new indexes are reasonable for representing the spectral irradiance distribution and its effect on PV performance.
Takumi Takashima - One of the best experts on this subject based on the ideXlab platform.
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effects of Solar Spectrum and module temperature on outdoor performance of photovoltaic modules in round robin measurements in japan
Progress in Photovoltaics, 2011Co-Authors: Tetsuyuki Ishii, Kenji Otani, Takumi TakashimaAbstract:The performance of six photovoltaic (PV) modules composed of polycrystalline silicon (pc-Si), amorphous silicon (a-Si), and hydrogenated amorphous silicon/crystalline silicon (a-Si:H/c-Si) modules was investigated at eight locations in Japan from August 2007 to December 2008. In addition, Solar irradiance, Solar Spectrum, and module temperature were simultaneously measured in these round-robin measurements. In this study, we evaluate quantitatively the effects of module temperature and Solar Spectrum on the performance of the PV modules as thermal factor (TF) and spectral factor (SF), respectively. Furthermore, we investigate the variation in module performance, which is converted into module performance under standard test conditions (STC) using the TF and SF. In the case of the pc-Si modules, the variations in performance ratio under STC (PRSTC) for these modules range from 0.056 to 0.074 through the round-robin measurements. The TF indicates that the contribution of module temperature to the variation in performance is large, between about 15 and 20%. However, the SF suggests that the contribution of Solar Spectrum is quite small, less than 3%. In the case of the a-Si modules, the contribution of module temperature is about 8%. The performance is largely influenced by Solar Spectrum, more than 12% at its maximum. Consequently, the variations in the corrected PRSTC of the a-Si modules are between 0.117 and 0.141. These large variations may result from the effects of thermal annealing and light soaking. The variation in PRSTC of the a-Si:H/c-Si module is similar to that of the pc-Si modules. Copyright © 2010 John Wiley & Sons, Ltd.
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Effects of Solar Spectrum and module temperature on outdoor performance of photovoltaic modules in round‐robin measurements in Japan
Progress in Photovoltaics, 2010Co-Authors: Tetsuyuki Ishii, Kenji Otani, Takumi TakashimaAbstract:The performance of six photovoltaic (PV) modules composed of polycrystalline silicon (pc-Si), amorphous silicon (a-Si), and hydrogenated amorphous silicon/crystalline silicon (a-Si:H/c-Si) modules was investigated at eight locations in Japan from August 2007 to December 2008. In addition, Solar irradiance, Solar Spectrum, and module temperature were simultaneously measured in these round-robin measurements. In this study, we evaluate quantitatively the effects of module temperature and Solar Spectrum on the performance of the PV modules as thermal factor (TF) and spectral factor (SF), respectively. Furthermore, we investigate the variation in module performance, which is converted into module performance under standard test conditions (STC) using the TF and SF. In the case of the pc-Si modules, the variations in performance ratio under STC (PRSTC) for these modules range from 0.056 to 0.074 through the round-robin measurements. The TF indicates that the contribution of module temperature to the variation in performance is large, between about 15 and 20%. However, the SF suggests that the contribution of Solar Spectrum is quite small, less than 3%. In the case of the a-Si modules, the contribution of module temperature is about 8%. The performance is largely influenced by Solar Spectrum, more than 12% at its maximum. Consequently, the variations in the corrected PRSTC of the a-Si modules are between 0.117 and 0.141. These large variations may result from the effects of thermal annealing and light soaking. The variation in PRSTC of the a-Si:H/c-Si module is similar to that of the pc-Si modules. Copyright © 2010 John Wiley & Sons, Ltd.
Xiujian Zhao - One of the best experts on this subject based on the ideXlab platform.
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Extremely efficient full Solar Spectrum light driven thermocatalytic activity for the oxidation of VOCs on OMS-2 nanorod catalyst
Applied Catalysis B-environmental, 2015Co-Authors: Yuanzhi Li, Min Zeng, Xiujian ZhaoAbstract:Abstract The cryptomelane-type octahedral molecular sieve (OMS-2) nanorod catalysts with different concentration of oxygen vacancy exhibit strong absorption across the full Solar spectra. The OMS-2 catalysts can efficiently transform the absorbed Solar energy to thermal energy, resulting in a considerable increase of temperature up to 220 °C. By combining the strong absorption across the full Solar Spectrum and the highly efficient thermocatalytic activity of the OMS-2 catalyst with high concentration of oxygen vacancies, full Solar Spectrum, visible-infrared, and infrared light driven thermocatalysis with extremely high efficiency are achieved. Under the irradiation of full Solar Spectrum, visible-infrared, and infrared light, the OMS-2 catalyst exhibits extremely high catalytic activity and excellent durability for the oxidation of organic pollutants such as benzene, toluene, and acetone. Under the full Solar Spectrum irradiation, the initial CO2 formation rate of the OMS-2 catalyst for benzene oxidation is 22.1 times larger than that of Bi2WO6/TiO2, a near-infrared photocatalyst reported recently. After the OMS-2 catalyst was recycled for 40 times, its catalytic activity remains unchanged. A novel mechanism of Solar light driven thermocatalysis is proposed, and the reason why the OMS-2 catalyst with high concentration of oxygen vacancies exhibits the extremely high catalytic activity is discussed.
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full Solar Spectrum light driven thermocatalysis with extremely high efficiency on nanostructured ce ion substituted oms 2 catalyst for vocs purification
Nanoscale, 2015Co-Authors: Yuanzhi Li, Neville G Greaves, Xiujian ZhaoAbstract:The nanostructured Ce ion substituted cryptomelane-type octahedral molecular sieve (OMS-2) catalyst exhibits strong absorption in the entire Solar Spectrum region. The Ce ion substituted OMS-2 catalyst can efficiently transform the absorbed Solar energy to thermal energy, resulting in a considerable increase of temperature. By combining the efficient photothermal conversion and thermocatalytic activity of the Ce ion substituted OMS-2 catalyst, we carried out full Solar Spectrum, visible-infrared, and infrared light driven catalysis with extremely high efficiency. Under the irradiation of full Solar Spectrum, visible-infrared, and infrared light, the Ce ion substituted OMS-2 catalyst exhibits extremely high catalytic activity and excellent durability for the oxidation of volatile organic pollutants such as benzene, toluene, and acetone. Based on the experimental evidence, we propose a novel mechanism of Solar light driven thermocatalysis for the Ce ion substituted OMS-2 catalyst. The reason why the Ce ion substituted OMS-2 catalyst exhibits much higher catalytic activity than pure OMS-2 and CeO2/OMS-2 nano composite under the full Solar Spectrum irradiation is discussed.
Yuhei Horio - One of the best experts on this subject based on the ideXlab platform.
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Impact of average photon-energy coefficient of Solar Spectrum on the short circuit current of photovoltaic modules
Current Applied Physics, 2017Co-Authors: Yuhei Horio, Yurei Imai, Yoshihiro Hishikawa, Md. Mijanur Rahman, Takashi MinemotoAbstract:The output energy of photovoltaic (PV) modules is influenced by the spectral irradiance distribution of the Solar Spectrum under outdoor conditions. To rate the precise output energy of PV modules, the correction of short circuit current (ISC) based on actual environmental conditions is needed, because ISCsignificantly depends on the shape of the spectral irradiance distribution. The average photon energy (APE) is a zero-dimensional index for spectral irradiance distribution, and APE value uniquely describes the shape of a Solar Spectrum. Thus, APE has an impact on ISCof PV modules. In this contribution, the relationship between APE coefficient and ISCof the multi-crystalline silicon, single-crystalline silicon, heterojunction intrinsic thin-layer, back contact, copper indium selenide and cadmium telluride PV modules has explored. It is revealed that APE value changes the ISCof PV modules which appeared to have immense possibilities of ISCcorrection using APE coefficient. This new approach can be very effective for precise rating the output energy of PV modules under actual outdoor conditions.
