| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
This study prototyped a greenhouse venetian-blind-type shading system using a semitransparent photovoltaic (PV) module as a blind blade. An electronic control circuit was developed to regulate the PV module inclination autonomously according to solar irradiance. The prototype PV blind installed on a test greenhouse roof was operated using electricity provided by the PV blade itself. In times of intense solar irradiance, the PV module was oriented parallel to the roof. When the irradiance was less than a predetermined threshold value, the module was oriented perpendicular to the roof, prioritizing the sunlight intake into the greenhouse. After evaluating the system performance, an identical PV module was added on the common rotation axis of the original PV module to increase the electrical energy productivity. The energy balance of the twin blind operation was recorded continuously for two months. The system’s cumulative net energy became positive at the end of the operation test.
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