A heat exchange system adapted to selectively operate in wet mode, dry mode, or both wet and dry mode comprises a plurality of layers of tube arrays arranged in a folded serpentine or stacked relationship such that fluid passes through each layer in a generally lateral manner, through a layer transition portion that conveys fluid to a lower layer of tube arrays existing at a lower elevation, one or more spray nozzles are located above an array of tubing and adapted to spray fluid onto the one or more arrays of tubing located below, and at least one fluid router is configured to convey process fluid only into the arrays of tubing in dry mode, only to the spray nozzles in wet mode, or to both into the arrays of tubing and to the spray nozzles.
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