FIELD: heat power engineering. SUBSTANCE: insert 3 is mounted inside each pipe 2 of the heat exchanging apparatus. The diameter of the insert is about 40-60% of the inner diameter of the pipe. The insert is made of a flexible material, e.g. polyethylene. The insert can be non-cylindric. The side of the insert can be rough. EFFECT: enhanced efficiency. 4 cl, 3 dwg
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