FIELD: heat-power engineering; transport power engineering. SUBSTANCE: heat exchanger includes shell 1 with flat multi-passage twisted pipe 2 mounted inside it. Outer surfaces of passages are provided with system of hemispherical dimples 5 and 6 forming system of smooth projections inside passages of pipe 2 and shell 1; passages located on shell 1 are arranged spirally at twist angle equal to that of pipe 2. EFFECT: enhanced efficiency. 6 cl, 6 dwg
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