| Summary: | Improving the efficiency and energy saving of energy complexes and heat supply systems is one the most important fields of the Russian economy modernization. In the field of industrial heat and power engineering, the increasing energy efficiency is an urgent task both at the design stage and at the equipment operation stage. For these purposes, numerical modeling methods are actively used. The paper presents the developed mathematical model of the pipeline located in the soil, which allows improving efficiency of energy systems and heat supply systems at the stage of operation. Also this paper presents the results of laboratory studies, namely, the informative frequency ranges of the investigated pipeline for further assessment of its technical condition.
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