Application of through account to the compound systems containing radiating heat exchange sites

The method of the heat transfer equation decision in the systems of bodies which do not have mechanical contact, by replacement of sites with radiating heat exchange on sites with the heat conductivity mechanism of a heat transfer. That allows to apply the through account method to all system as a whole, not breaking it on a sub systems. The effective thermal conductivity coefficient for coaxial cylinders system with narrow vacuum slot is defined, the results of numerical realization verification are also presented.