Abstract: A heat-exchange arrangement includes a housing which has an inner surface defining a first flow path for a fluid to undergo heat-exchange. The inner surface of the housing comprises a pair of substantially parallel surface portions which bound the first flow path along the flow direction so that the first flow path is of substantially constant width along the flow direction. A plurality of spaced conduits is arranged in the first flow path and defines a series of second flow paths for a medium to undergo heat-exchange with a fluid flowing in the first flow path. The conduits are arranged such that substantially the same predetermined minimum distance separates the most closely spaced ones of the conduits. A plurality of baffles in the first flow path serves to regulate the flow pattern of a fluid flowing in the first flow path.