Abstract: A heat exchanger module includes a curved inner surface adapted to enclose at least a portion of an outside surface of a conduit. The heat exchanger module further includes a curved outer surface at least partially enclosing the curved inner surface. The heat exchanger module further includes a first port adapted to receive heat exchanger fluid and a second port spaced from the first port and adapted to exhaust heat exchanger fluid. The heat exchanger module further comprises a plurality of curved flow guides disposed between the curved inner surface and the curved outer surface. The curved flow guides are disposed between the first and second ports and they define a closed flow path between the first port and the second port.