Comparison between Plate Heat Exchanger and Shell – and – tube Heat Exchanger

Comparison between Plate Heat Exchanger and Shell – and – tube Heat Exchanger


Plate heat exchanger and shell and tube heat exchanger compared to their own advantages and disadvantages
1. The logarithmic mean temperature difference is large and the terminal temperature difference is small
The flow of cold and hot liquid in the plate heat exchanger is parallel to the heat transfer surface, and the side temperature difference of the plate heat exchanger is small, and the heat transfer to the water is lower than 1 ℃, The heater is typically 5 ° C.
2. Small footprint
Plate heat exchanger compact structure, the volume per unit volume of the shell-and-tube type of 2-5 times, nor as the shell and tube to be set aside to take out the inspection of the site, so the same heat transfer, Type heat exchanger covers an area of ​​about 1 / 5-1 / 10 of shell and tube heat exchangers.
3. Easy to change the heat transfer area or process combination
4. High heat transfer coefficient.
5. Light weight
Plate plate heat exchanger plate thickness of only 0.4 ~ 0.8mm, shell and tube heat exchanger heat transfer tube thickness of 2.0 – 2.5mm, shell and shell of the shell than the heat exchanger frame is much heavier , Plate heat exchanger generally only shell and tube weight of about 1/5 or so.
6. Easy to produce
Plate heat exchanger plate is the use of stamping processing, a high degree of standardization, and mass production, shell and tube heat exchanger is generally used by hand.
7. Low prices
Using the same material, in the same heat transfer area. Plate heat exchanger price than shell and tube about 40% to 60%.
8. Easy to clean
Frame-type plate heat exchanger as long as the loose tightening screw, you can board open board, remove the plate for mechanical cleaning, in the need for regular cleaning equipment, the occasion is very convenient to use.
9. Heat loss is small
Plate heat exchanger only heat board shell exposed to the atmosphere, so the heat loss can be ignored, no insulation measures. While the shell and tube heat exchanger heat loss, you need to heat.
10. Small capacity
Is shell and tube heat exchanger 10% to 20%.
11. easy to scale
As the internal water turbulence, not easy to scale, the scale factor is only tube heat exchanger 1/3 to 1/10.
12. Plate heat exchanger with gasket seal
Work pressure generally should not exceed 2.5MPa, the medium temperature should be below 250 ~ C the following, otherwise there may be leakage.
13. As the inter-board channel is very narrow, generally only 2-5mm, when the heat transfer medium contains large particles or fiber material, easy to plug.

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