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Periodic thermal processes and periodic temperature fields are of widespread occurrence in nature and technology. In nature they are at a large conditioned by periodic processes, such as the Earth’s one year period orbital motion, its diurnal rotation, etc. In conductive heat transfer mechanism daily variations in temperature almost decay in a layer about 1 meter thick and annual variations do it in a 18-21meters thick layer. In the case that periodic Sun heating coincides with fluid mass transfer (when water pe...