(57) Apparatus for ensuring heat exchange between a gas flow and a heat exchanger comprises
a duct (2) through which the gas flows. The heat exchanger (6, 44) ist mounted in
the duct such that the gas flows therethrough. Constrictions for the gas flow are
arranged in the duct upstream of the heat exchanger in the direction (A) of gas flow
such that jets of gas are created. The constrictions are provided by flow passages
extending through a diaphragm (24,124,224, 324, 424, 524, 624, 724) mounted across
the duct.
In use liquid is sprayed over the heat exchanger (6, 44) and the high velocity jets
of gas pick up the liquid and carry it into the heat exchanger. In this way the surfaces
of the heat exchanger are thoroughly wetted by the liquid and the efficiency of the
heat transfer is thereby improved.
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