A heat exchanger is a device which transfers heat energy from one fluid (or gas) to another fluid (or gas), and without mixing the two different fluids (or gases).

A common example: Automotive Radiators. Heat from the hot engine water is pumped through the radiator, while air is blown through the radiator tins. The hot engine water's heat energy is transferred to the air, thus keeping the water at the right temperature, to keep the engine at the right temperature. Essentially an automotive radiator is a Liquid to Air Heat Exchanger.

Other types of heat exchangers are common in every day equipment, such as boilers, furnaces, refrigerators, air conditioning systems, and more. In fact, every air conditioning system and refrigeration system has at least two heat exchangers one for the cooling side, and one to expel the heat.

GEA PHE Systems heat exchangers are used to heat or cool various fluids or gases. Specifically, they are used for refrigerant to fluid applications, fluid to fluid, and sometimes gas applications. What is unique about GEA technology is that it is very compact, and it is widely used in residential, commercial and industrial applications as a key system component to transfer heat.