The plate heat exchanger (PHE) was invented by Dr Richard Seligman in 1923. This type of exchanger consists of parallel plate held firmly together between substantial head frames. These plates serve as the heat transfer surfaces. The design principle is as simple as the other plate and frame equipments. The plates are pressed, corrugated metals fitted between a thick, carbon steel frame. The presence of the corrugated plates provides a higher degree of turbulence even at low flow rates. Each plate flow channel is sealed with a gasket, a weld, or an alternating combination of the two. The advantages of this type of heat exchangers are low pressure drops, absence of interleakage of fluids, ease in cleaning and dismantling and high heat transfer coefficients.
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