heat exchanger

any device, as a radiator or a condenser, for transferring heat energy to a cooler medium from a warmer one for heating or cooling purposes

See heat exchanger in American Heritage Dictionary 4

noun
A device, such as an automobile radiator, used to transfer heat from a fluid on one side of a barrier to a fluid on the other side without bringing the fluids into direct contact.

(click for a larger image)

heat exhanger

parallel flow heat exhanger

Learn more about heat exchanger

heat exchanger

link/cite print suggestion box