The article discusses improvement of a flat solar collector with the heat exchange process intensifying aim, which improves the quality and the equipment efficiency in question. Based on the solar thermal plants’ calculation, taking into account the design features affecting the generated energy amount, a comparative analysis of the characteristics of traditional flat solar collector and solar collector of intensified heat exchange with an independent heating contour was carried out. The theoretical study results of the thermal energy accumulation processes by solar receiving devices of two types are presented.