FIELD: heating equipment.
SUBSTANCE: invention relates to heat engineering and can be used in heat exchangers. Heat exchange unit comprises: casing (11) comprising rear wall (11d), front wall (22) and peripheral side wall (11c); helically-shaped heat exchanger (13) comprising at least one tubular duct for the flow of a first heat transfer fluid coiled into a plurality of coils about a longitudinal axis of the helix, wherein said heat exchanger (13) is installed in said casing (11); a feeding zone of a second heat transfer fluid, intended for the heat exchange with the first heat transfer fluid, defined in casing (11) coaxially and internally with respect to heat exchanger (13); first chamber (15) for collecting the second heat transfer fluid externally defined with respect to heat exchanger (13) between a radially outer wall of heat exchanger (13) and peripheral side wall (11c) of casing (11); and second chamber (16) for collecting the second heat transfer fluid at least partially delimited by at least one separating element (14). Separating element (14) is mounted at an axially external position with respect to heat exchanger (13) in such a way as to define second chamber (16) for collecting the second heat transfer fluid between separating element (14), peripheral side wall (11c) and rear wall (11d) or front wall (22) of casing (11); in this way, first (15) and second (16) collection chambers are in fluid communication with each other by means of at least one passage (17a, 17a', 17b–17g; 14e) configured to allow a flow of the second heat transfer fluid substantially in parallel to peripheral side wall (11c) of casing (11) and in proximity thereto. Separating element (14) comprises a heat exchange portion in contact with at least one portion of an end coil of heat exchanger (13) and configured to allow heat exchange between the coil-shaped portion of heat exchanger (13) and second collection chamber (16), while heat exchange cell (10) further comprises at least one second passage (35) allowing a fluid outlet from second collection chamber (16) peripherally defined in second chamber (16) between axial end (11g) of peripheral side wall (11c) and rear wall (11d) or front wall (22) of casing (11).
EFFECT: heat exchange unit and heat exchange method are disclosed.
46 cl, 25 dwg
