+A **heat exchanger** is a device built for efficient [Heat Transfer](/wiki/heat_transfer) between two or more fluids, without their direct mixing. It serves to warm or cool, harnessing temperature differences for various [Energy](/wiki/energy) applications.
+## See also
+- [Fluid](/wiki/fluid)
+- [Temperature](/wiki/temperature)
+- [Thermodynamics](/wiki/thermodynamics)
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