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equivalent absorptivity
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The absorptivity of flat metal plate is determined by coat absorptivity and that of the surface porous metal plate is by not only the coat absorptivity but also the porous ratio and the dimension of the hole. The method of beam track is introduced to briefly analyze the light-heat property of the surface porous metal plate,and a condideration to adopt the surface porous plate to replace flat plate as the collecting heat plate is proposed. A conclusion is reached that the surface porous metal plate excels flat...

The absorptivity of flat metal plate is determined by coat absorptivity and that of the surface porous metal plate is by not only the coat absorptivity but also the porous ratio and the dimension of the hole. The method of beam track is introduced to briefly analyze the light-heat property of the surface porous metal plate,and a condideration to adopt the surface porous plate to replace flat plate as the collecting heat plate is proposed. A conclusion is reached that the surface porous metal plate excels flat metal plate at equivalent absorptivity on the same condition. Also the development, type, rule and light-heat transfer principle of the solar collectors are summarized.

光滑金属板的作为吸热板芯时 ,其吸收率取决于涂层的吸收率 ,而用表面多孔板作为吸热板芯时 ,其吸收率则取决于板孔隙率和孔尺寸与涂层的吸收率 .作者通过光线跟踪法多孔板的光热性能作了简单的分析 ,并设想采用表面多孔金属板代替光滑板作为太阳能集热器吸热板芯 .分析得知 :多孔板等效吸收率高于同等条件下光滑板的吸收率 .同时详细阐述了太阳能集热器的发展状况、种类、原理以及集热器的光热转换原理 .

 
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