A HEAT EXCHANGE UNIT

摘要

A heat exchange unit for hot gas heat recovery comprising: a heat exchange (123) duct housing a heat exchange array (113); a bypass duct (111); an arrangement configured to cause variable amounts of hot gas to flow through the bypass duct and the heat exchange duct; and a barrier (135) intermediate the heat exchange duct and bypass duct and including a cavity (136) through which a fluid may be introduced so as to extract heat that would otherwise transfer from the bypass duct to the heat exchange duct and/or vice versa.