A plate heat exchanger is a type of heat exchanger that uses metal plates to transfer discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy and heat between physical systems. The concept behind a heat exchanger is the use of pipes or other containment vessels to heat or cool one fluid by transferring heat between it and another fluid. The walls of the pipe are usually made of metal, or another substance with a high thermal conductivity, to facilitate the interchange, whereas the outer casing of the larger chamber is made of a plastic or coated with thermal insulation, to discourage heat from escaping from the exchanger.
Plate heat exchangers also differ in the types of plates that are used, and in the configurations of those plates. Some plates may be stamped with "chevron", dimpled, or other patterns,Plate offers high heat transfer, high pressure, high operating temperature, compact size, low fouling and close approach temperature. In particular, it does completely without gaskets, which provides security against leakage at high pressures and temperatures.when used in open loops, these heat exchangers are normally of the gasket type to allow periodic disassembly, cleaning, and inspection.The plates used in a plate and frame heat exchanger are obtained by one piece pressing of metal plates. Greater heat transfer enhancement is produced from chevrons for a given increase in pressure drop and are more commonly used than intermating corrugations.
All plate heat exchangers look similar on the outside.the details of the plate design and the sealing technologies used.Stainless steel is a commonly used metal for the plates because of its ability to withstand high temperatures