Abstract
In the work herein there is considered the heat transfer computation at the solar collector and environment boundaries and solar heat supply system energy balance.Heat exchange and heat transfer occur simultaneously by several means: conduction, convection and irradiation.Role of heat transfer in solar collector total heat transfer means is different and depends both on its material elements' thermal-physical characteristics and air medium, circumfluous solar collector's external and internal surfaces We have computed the solar power value from the horizontal surface for summer and autumn seasons in the Republic of Kazakhstan.