Plate solar collector (hereinafter referred to as the "flat-plate collector") to receive the most solar radiation, the most mature technology, low cost and no need to trace the characteristics of the dispersion of strong, fit the solar energy can flow density is low and unstable characteristics, is the most warm in a large number of low human can consume one of the most effective device, its solid slab structure is easy to combine with architecture, as solar heat utilization technology and hardware support.