An exemplary heat exchange system includes a first stage including a first stage heat exchanger and a tower wherein the first stage heat exchanger exchanges heat between a fluid and air to thereby heat the air and generate air convection in the tower; and a second stage including a second stage heat exchanger and a powerable convection unit wherein the second stage heat exchanger receives the fluid from the first stage and exchanges heat between the fluid and air. An exemplary method includes transferring heat energy from a fluid to air using a first heat exchanger to cause air convection in a tower; and transferring heat energy from the fluid to air using a second heat exchanger and a fan. Various other exemplary systems and methods are also disclosed.
 The United States Government has rights I this invention pursuant to Contract No. DE-AC36-99GO10337 between the U.S. Department of Energy and the National Renewable Energy Laboratory, a division of Midwest Research Institute.