Heat exchangers is a broad term used in reference to devices designed for exchanging heat. Most often the heat is transferred from one fluid to another. A fluid that is discharged from a useful process might contain high energy, and it may be desirable to recover some of the energy that would ordinarily be discarded. One example of this is in remotely located power plants that generate their own electricity through steam turbines. Condensed steam that is still at a relzatively high temperature might be routed through a small exchanger where it is used to heat water. A common example of a heat exchanger that dissipates unwanted energy is the radiator of a car.