FIELD: mechanical engineering; ventilation systems. SUBSTANCE: screw channels of heat exchanger-recuperator are isosceles triangles in cross section. Base of inlet screw channel is located on outer side of shell of secondary heating chamber, and base of outlet channel is located on inner wall of housing shell. EFFECT: increased efficiency of plant due to increasing in heat exchange area of side walls of inlet and outlet channels and two-fold increase in heat exchange area of inlet channel and outer surface of secondary heating chamber. 1 dwg
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