Papers - NISHIOKA Kensuke
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Ahmad N., Hatakeyama K., Ota Y., Nishioka K.
MATEC Web of Conferences 65 2016.7
Language：English Publishing type：Research paper (international conference proceedings) Publisher：MATEC Web of Conferences
© 2016 Owned by the authors, published by EDP Sciences. This paper presents a comparison of three-dimensional simulation for concentrator photovoltaic module using two types of multi-junction solar cell. Each had its own range of spectral response and based on that range a thin film filter was developed for each case to reflect the unused spectral of the solar spectrum and allowed the desired spectrum to reach the solar cell. The thin film was deposited on a secondary optical element that was used to homogenize the irradiance distribution on the solar cell. A thermal simulation was conducted to compare the resulted decrease in cell temperature due to the use of the thin film for each case.
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Reduction of temperature in silicon photovoltaic module using thermal radiation coating Reviewed
Nakamura S., Nishioka K.
MATEC Web of Conferences 65 2016.7
Language：English Publishing type：Research paper (international conference proceedings) Publisher：MATEC Web of Conferences
© 2016 Owned by the authors, published by EDP Sciences. The temperature of solar cells increases under the actual operating conditions, and the conversion efficiency of solar cells decreases with increasing temperature. In this study, a thermal radiation layer was coated on the back sheet of the PV module by a spray coating method and the effect was evaluated. The thickness of the layer was 30 μm. The temperature of the PV module with the thermal radiation coating was lower than that of the PV module without the thermal radiation coating. And the operating temperature range of the PV module with the thermal radiation coating was decreased by 2~3°C. The open-circuit voltage of the PV module with the thermal radiation coating was 0.1 V higher than that of the module without the coating due to the thermal radiation coating.
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Nakamura S., Sakamoto K., Nishioka K.
MATEC Web of Conferences 65 2016.7
Language：English Publishing type：Research paper (international conference proceedings) Publisher：MATEC Web of Conferences
© 2016 Owned by the authors, published by EDP Sciences. The temperature of solar cells considerably increases under light-concentrating operations, and the conversion efficiency of solar cells decreases with increasing temperature. It is very important to reduce the cell temperature in concentrator photovoltaic modules. The thermal radiation layers with high thermal emissivity and thermal conductivity was coated on the aluminum samples which is used for the chassis of concentrator photovoltaic and the effect was evaluated under the conditions with wind. The temperature of sample with coating showed lower temperature than that without coating. In the condition with wind, the coated sample with high thermal emissivity and high thermal conductivity showed the lowest temperature due to the effect of thermal radiation and thermal conduction.
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Outdoor Performance Comparison of Concentrator Photovoltaic and Flat Plate Photovoltaic Systems Reviewed
Hidaka Y., Imai K., Ota Y., Nishioka K.
MATEC Web of Conferences 65 2016.7
Language：English Publishing type：Research paper (international conference proceedings) Publisher：MATEC Web of Conferences
© 2016 Owned by the authors, published by EDP Sciences. Output characteristics of tracking type concentrator photovoltaic (CPV) system, multi-crystalline silicon (mc-Si) PV system, CIGS PV system, and amorphous silicon (a-Si) PV system were analyzed in the data period of a year from August 2013 to July 2014. In this study, we analyzed the influence of environmental factors using average photon energy (APE) and temperature of solar cell (T cell ). The characteristics of 14 kW CPV system, 50 kW mc-Si PV system, 60 kW CIGS PV system, 1.35 kW a-Si PV system were evaluated and compared. As a result, the output performance of CPV was highest between the four systems at the most frequent conditions in the outdoor environment.
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Sugiyama M., Nakamura A., Watanabe K., Ota Y., Nishioka K., Nakano Y., Fujii K.
2015 IEEE 42nd Photovoltaic Specialist Conference, PVSC 2015 2015.12
Language：English Publishing type：Research paper (international conference proceedings) Publisher：2015 IEEE 42nd Photovoltaic Specialist Conference, PVSC 2015
© 2015 IEEE. Solar hydrogen production is one of the most re-quired technologies for the realization of sustainable energy sys-tems which is independent of fossil fuel. The solar-to-hydrogen (STH) energy conversion efficiency for photocatalysts, which have been studied quite intensively for decades, remains much lower than 10%. The combination of photovoltaic and electrochemical cells, on the other hand, can easily achieve the STH efficiency over 10%. We here present the field demonstration of a system combin-ing a concentrator photovoltaic (CPV) module and polymer elec-trolyzers, which led us to the STH efficiency of 17.1%. A method will be presented to optimize the series/parallel connection be-tween CPV and electrolyzers for maximizing the STH, which pre-dicts 28% STH when 35%-efficient CPV module is used.
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0619 The Effect of the Slit width having the CPV of Three-divided-Panel Type Reviewed
OGAWA Kazuma, OZONO Shigehira, NISHIOKA Kensuke
Fluids engineering conference ... 2015 "0619 - 1"-"0619-3" 2015.11
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers
This paper deals with the aerodynamic characteristics of the concentrated photovoltaic system (i.e. CPV) of three-divided-panel type. A preceding experimental study indicates that the moment around the shaft supporting the panel decreases when the acceptance surface of the panel faces downstream ('downstream case'). To investigate the mechanism, we conducted measurements on the aerodynamic forces in a wind tunnel. It is found that as the slit width increases, the moment gradually decreases to small values when the acceptance surface faces downstream. This reduction probably comes from uniformity of the pressure distribution on the rear surface for the downstream case.
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A 24.4% solar to hydrogen energy conversion efficiency by combining concentrator photovoltaic modules and electrochemical cells Reviewed
Akihiro Nakamura, Yasuyuki Ota, Kayo Koike, Yoshihide Hidaka, Kensuke Nishioka, Masakazu Sugiyama, Katsushi Fujii
Applied Physics Express 8 ( 10 ) 107101-1 - 107101-4 2015.10
Language：English Publishing type：Research paper (scientific journal)
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Anti-soiling coating based on silica for Fresnel lens of concentrator photovoltaics Reviewed
Takuya Hirohata, Yasuyuki Ota, Kensuke Nishioka
Japanese Journal of Applied Physics 54 ( 8S1 ) 08KE09-1 - 08KE09-4 2015.8
Language：English Publishing type：Research paper (scientific journal)
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Effect of aerosols on performance of concentrator photovoltaics Reviewed
Kei Nomura, Kenta Imai, Yasuyuki Ota, Takashi Minemoto, Kensuke Nishioka
Japanese Journal of Applied Physics 54 ( 8S1 ) 08KE07-1 - 08KE07-4 2015.8
Language：English Publishing type：Research paper (scientific journal)
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Field test analysis of concentrator photovoltaic system focusing on average photon energy and temperature Reviewed
Husyira Al Husna, Yasuyuki Ota, Takashi Minemoto, Kensuke Nishioka
Japanese Journal of Applied Physics 54 ( 8S1 ) 08KE05-1 - 08KE05-4 2015.8
Language：English Publishing type：Research paper (scientific journal)
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降灰が太陽光発電システム出力におよぼす影響 Reviewed
西岡 賢祐, 太田 靖之
電気設備学会誌 35 ( 5 ) 348 - 353 2015.5
Language：Japanese Publishing type：Research paper (scientific journal)
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2分割型太陽光発電システムの空力特性 Reviewed
小川 和馬, 柳ヶ瀬 光, 小園 茂平, 西岡 賢祐
第23回風工学シンポジウム論文集 289 - 294 2015.3
Language：Japanese Publishing type：Research paper (scientific journal)
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Formation of Silicon Carbide Using Volcanic Ash as Starting Material and Concentrated Sunlight as Energy Resource Reviewed
Kensuke Nishioka, Junki Komori, Kouji Maeda, Yasuyuki Ota, Hiroshi Kaneko, Kosei Sato
International Journal of Photoenergy 2015 ID394605 1 - ID394605 4 2015.3
Language：English Publishing type：Research paper (scientific journal)
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Uniqueness verification of direct solar spectral index for estimating outdoor performance of concentrator photovoltaic systems Reviewed
Jakapan Chantana, Seiya Ueno, Yasuyuki Ota, Kensuke Nishioka, Takashi Minemoto
Renewable Energy 75 762 - 766 2015.3
Language：English Publishing type：Research paper (scientific journal)
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集光太陽光の活用技術 Invited Reviewed
西岡賢祐
安全工学 53 ( 6 ) 425 - 430 2014.12
Language：Japanese Publishing type：Research paper (scientific journal)
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Estimation of operating temperature and energy output of concentrator photovoltaic module under concentration conditions Reviewed
Yasuyuki Ota, Kensuke Nishioka
Japanese Journal of Applied Physics 53 ( 12 ) 122301-1 - 122301-5 2014.12
Language：English Publishing type：Research paper (scientific journal)
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Seasonal variation of performance in concentrator photovoltaic system Reviewed
Kei Nomura, Yasuyuki Ota, Takashi Minemoto, Kensuke Nishioka
physica status solidi (c) 11 ( 7 ) 1427 - 1430 2014.9
Language：English Publishing type：Research paper (scientific journal)
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Effect of Alcohol-Assisted Annealing on the Quality of Silicon Oxide Thin Film Reviewed
Takuya Ito, Yasuyuki Ota, Koichiro Shiomori, Kensuke Nishioka
Journal of Electronic Materials 43 ( 7 ) 2683 - 2687 2014.7
Language：English Publishing type：Research paper (scientific journal)
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Output Estimation of Concentrator Photovoltaic Using Mappings of Environmental Factors and Performance Ratio Reviewed
K. Nomura, Y. Ota, T. Minemoto and K. Nishioka
ACTA PHYSICA POLONICA A 125 ( 4 ) 1021 - 1023 2014.4
Language：English Publishing type：Research paper (scientific journal)
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Estimation of thermal stress in concentrator cells using structural mechanics simulation Reviewed
Yasuyuki Ota, Kensuke Nishioka
AIP Conference Proceedings (10TH INTERNATIONAL CONFERENCE ON CONCENTRATING PHOTOVOLTAIC SYSTEMS: CPV-10) 1616 25 - 28 2014.4
Language：English Publishing type：Research paper (scientific journal)