2018 Fiscal Year Annual Research Report
Electrical, thermal and structural performance of new membrane building integrated PVs
| Project/Area Number |
18F18345
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| Research Institution | The University of Tokyo |
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Principal Investigator |
川口 健一 東京大学, 生産技術研究所, 教授 (40234041)
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| Co-Investigator(Kenkyū-buntansha) |
HU JIANHUI 東京大学, 生産技術研究所, 外国人特別研究員
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| Project Period (FY) |
2018-10-12 – 2021-03-31
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| Keywords | ETFE foil / indoor membrane stadium / ETFE structures; BIPV / mechanical properties / building performance / long-term performance / retractable membrane ceiling |
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| Outline of Annual Research Achievements |
1. Investigation of building environment and energy consumption of large-span stadiums. The energy performance is then analyzed with statistical methods to obtain suitable values for designing and retrofitting similar stadiums. The research results are published in Engineering Structures and Energy and Buildings.
2. Membrane material integrated photovoltaics. Overall performance of temperature distribution and mechanical properties is investigated with experiments cooperated with Shanghai Jiao Tong University. It is found that yield point has a crucial effect on temperature-stress correlation and that mechanical properties of double OPV specimens are better than those of single OPV specimens. Also it is pointed out that high temperature needs to be reduced with phase change materials.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
After achieving basic performance of traditional membrane stadiums and novel membrane materials, the following main research focus is a systematic understanding of indoor thermal environment and essential properties of membrane materials integrated PV, which is the core research in the JSPS proposal. Moreover, a coupled PV electrical-thermal model will be proposed to generate temperature distribution for analyzing structural behavior.
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| Strategy for Future Research Activity |
1. Coupled PV electrical-thermal model. Based on energy balance principle, a theoretical model is proposed which is expressed in the way that absorbed energy is equal to the sum of electricity, temperature rise, radiant, convective and conduction energies. Through coupling temperature rise and electricity generation, integrating these items into one equation could result in a theoretical model. The indoor and outdoor experiments can be carried out, where voltage, current and temperature are measured with multi-meter and thermo-resistance.
2. Structural behavior. Considering the temperature-stress function and constitutive equation as well as based on virtual work principle and ideal gas equation, heat-fluid-structure interaction can be analyzed.
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Research Products
(1 results)
