持続可能な社会の建設(III) : 実効大気透過率 : メガフロートの建造方法の提案 : 洋上太陽光発電基地

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  • Construction of a sustainable society(III) : Effective atmosphere transmissivity : Proposal of a construction method of Mega-Float : Ocean photovoltaic power generation base

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After monthly having calculated amount of theoretical solar radiation in Minami Torishima, effective each month atmosphere transmissivity is derived by comparing the measurement value of the solar radiation with this. The integrated theoretical electric energy for every month by a solar cell (HIP5517 made by SANYO) is calculated using this monthly effective atmosphere transmissivity. Adding up 365 day’s electric energy, we get one year's integrated theoretical electric energy. Area of Mega-Float necessary for providing 274 million kW of the total power generation equipment capability of Japan only with a solar cell will be obtained by dividing this value by the above-mentioned integrated theoretical electric energy. We can easily derive this solution as 8802(km2). Since a passage must be added in consideration of workability, an installation area becomes large and reaches to 12980(km2). We propose a method for constituting the Mega-Float of area 12980(km2) carrying a solar cell by a basic unit of 2(km2) having a form of equilateral triangle Since unit itself is huge, this unit is constituted by small 400 subunits which have an area of 5000(m2) equilateral triangle. The construction cost and the time necessary for completion, are, respectively, approximately 135 trillion yen and approximately 24 years, under the condition of adopting this proposed method, and under the assumption of conversion efficiency of a solar cell to be 18%.

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