The plate heat exchanger is a type of heat exchanger, also known as a heat transfer carrier. This term is precise because during the process, there is no heat exchange, but rather heat transfer from one medium to another.

The plate heat exchanger consists of corrugated plates, which are assembled in a unique way. Between the plates, there are gaps where two media circulate alternately: the medium for heat absorption and the medium for heat diffusion. The device is sealed in various ways.

• Bolted plate heat exchangers: they are expandable and transfer flow differently.
• Welded plate heat exchangers, where the plates are welded together.