Скачать или смотреть Plate and frame heat exchanger | Animation | Heat transfer

Plate and frame heat exchangers are made of corrugated plates on a frame. This design creates high turbulence and high wall shear stress, both of which lead to a high heat transfer coefficient and a high fouling resistance. Fluids travel within the heat exchanger. The two streams flow counter currently. The hot fluid flows down one plate while the cold fluid flows up the other plate.

plate and frame heat exchanger diagramGaskets ensure that the cold fluid and the hot fluid don't mix. Alternatives to the traditional gasket seal include brazing and laser welding.

The plates are stacked in an alternating manner to cause the counter-current flow. Multiple plates are clamped together and sealed at the edges. The design allows for the two fluids to flow in alternate directions and not be mixed. However, heat can be transferred from one medium to the other through the plates.

Because gasketed plate and frame exchangers are easy to clean, they are especially useful for food and pharmaceutical processing, where high degrees of sanitation is required.

Advantages and disadvantages of plate and frame heat exchangers:

A plate & frame heat exchanger has the following advantages over the widely used shell and tube heat exchangers:

High value for overall heat transfer coefficient, for the same two fluids, a flat plate heat exchanger typically has a U value much higher than either a shell and tube heat exchanger or a spiral heat exchanger.
Compact design - The combination of high value for the overall heat transfer coefficient and the general compact configuration of the flat plate heat exchanger lead to its ability to have the same thermal capacity as a shell and tube heat exchanger as much as five times its size
Easy maintenance and cleaning - The fact that a plate and frame heat exchanger can be taken apart as discussed in the previous section, allows for easy cleaning and maintenance. A plate and frame heat exchanger can be designed to allow for easy addition or removal of plates to expand or reduce their heat transfer capacity.
Temperature control - A flat plate heat exchanger works well with small temperature differences between the hot fluid and the cold fluid.

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