FIELD: heat-exchange apparatus in power engineering, chemical engineering, construction, cryogenic engineering and other industries. SUBSTANCE: heat-exchange element includes pipe enclosed in envelope which has zones of surface contact with pipe. Number of zones per unit length of pipe may vary lengthwise. Pipe of heat-exchange element is provided with circular, spiral or other turbolators projecting inside pipe. EFFECT: enhanced efficiency. 9 cl, 6 dwg
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Authors
Dates
1997-08-27—Published
1994-12-29—Filed