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Reasons for Suggested Plate Heat Exchanger in HVAC Engineering

1. high heat transfer coefficient.
Because different corrugated plates are inverted to form complex channels, which make the fluid flow in three-dimensional rotational flow between corrugated plates, and can generate turbulence at lower Reynolds number (general Re=50-200), the heat transfer coefficient is high, generally considered to be 3-5 times of the shell-and-tube type.
2. The logarithmic mean temperature difference is large and the terminal temperature difference is small.
In shell-and-tube heat exchangers, two kinds of fluids flow in the tube side and shell side respectively. Generally, they flow cross-flow, and the logarithmic mean temperature difference correction coefficient is small. Most plate heat exchangers flow in parallel or counter-flow mode, and the correction coefficient is usually about 0.95. In addition, the flow of cold and hot fluids in plate heat exchangers is parallel to that in exchange. Thermal surface and no bypass make the end temperature difference of plate heat exchanger small, heat transfer to water can be less than 1 C, while shell and tube heat exchangers are generally 5 C.
3. small footprint
Plate heat exchanger has compact structure, and the heat transfer area per unit volume is 2-5 times of that of shell-and-tube heat exchanger. Unlike shell-and-tube heat exchanger, it is not necessary to reserve the repairing place for extracting tube bundles. Therefore, to achieve the same heat transfer capacity, plate heat exchanger covers an area of about 1/5-1/8 of that of shell-and-tube heat exchanger.
4. Easy to change heat transfer area or process combination
As long as a few plates are added or reduced, the purpose of increasing or reducing the heat transfer area can be achieved. By changing the plate arrangement or replacing several plates, the required process combination can be achieved and the heat transfer area of shell-and-tube heat exchangers can be adapted to the new heat transfer conditions. It is almost impossible to increase the heat transfer area of shell-and-tube heat exchangers.
5. light weight
The plate thickness of plate heat exchanger is only 0.4-0.8 mm, while the tube thickness of shell-and-tube heat exchanger is 2.0-2.5 mm. The shell-and-tube heat exchanger is much heavier than the frame of plate heat exchanger. Plate heat exchanger is generally only about 1/5 of the shell-and-tube weight.

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