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太阳能,作为一种巨大而无污染的再生能源,正愈来愈受到世界各国的重视。众所周知,日本为解决能源问题而制订的“阳光计划”中,太阳能利用的研究是中心内容之一;1979年6月20日,美国总统卡特宣布,到公元2000年,以太阳能为主的再生能源要占美国能源组成的20%。在大气层外,投射在与阳光垂直的表面上的太阳能强度为1.940卡/厘米~2·分(即1355瓦/米~2),这个值称为“太阳常数”。由于大气层的吸收和散射,到达地面的太阳能强度要比这个值小得多。通常,晴天
As a huge and non-polluting renewable energy, solar energy is receiving more and more attention from all over the world. As we all know, Japan’s “Sunshine Plan” formulated to solve the energy problem, solar energy utilization research is one of the center; June 20, 1979, U.S. President Carter announced that by the year 2000, solar-based renewable energy To account for 20% of the US energy mix. Outside the atmosphere, the solar energy projected onto the surface perpendicular to the sun is 1.940 cal / cm 2 (ie 1355 W / m 2). This value is called the “solar constant”. Due to the absorption and scattering of the atmosphere, the solar intensity reaching the ground is much lower than this value. Usually, sunny day