Heat exchangers are widely used in industrial applications both for cooling and heating large-scale industrial processes. The type and size of the heat exchanger (cooler)  used can be tailored to suit a process depending on the type of fluid, its phase, temperature, density, viscosity, pressures, chemical composition and various other thermodynamic properties.

In many industrial processes, there is a waste of energy or a heat stream that is being exhausted; heat exchangers can be used to recover this heat and put it to use by heating a different stream in the process. This practice saves a lot of money in industrial applications, as the heat supplied to other streams from the heat exchangers would otherwise come from an external source that is more expensive and more harmful to the environment.

Heat exchangers are used in many industries, including Wastewater treatment, Refrigeration, Wine and beer making. Petroleum refining, and nuclear power applications.