(57) A tube and fin heat exchanger is disclosed having a plurality of U-shaped tubes (14),
each comprising two substantially parallel legs (24) interconnected by a U-shaped
bight portion (26), and being arranged within the heat exchanger so that each leg
(24) thereof lies in a respective one of two separate banks of tube legs with the
banks being staggered relative to one another so that each U-shaped tube (14) lies
in a plane inclined at an acute angle to the longitudinal axes (32, 34) of the banks,
and the ends of the legs (24) are interconnected by manifolds (28, 30) having separate
plenum chambers (48, 50, 52, 54, 56, 58) so as to convey fluid back and forth across
the heat exchanger in a plurality of passes of several legs each.
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