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Comparison of Plate Heat Exchanger and Shell and Tube Heat Exchanger
Release time:
2024-03-27
Because different corrugated plates are inverted to each other, forming a complex flow channel, so that the fluid in the flow channel between the corrugated plates is rotating in the dimensional flow, can produce turbulence at a lower Reynolds number (generally Re = 50~200), so the heat transfer coefficient is high, generally considered to be 3~5 times that of the shell and tube type;
1, plate heat exchanger than shell and tube heat exchanger heat transfer coefficient is high
Because different corrugated plates are inverted to each other, forming a complex flow channel, so that the fluid in the flow channel between the corrugated plates is rotating in the dimensional flow, can produce turbulence at a lower Reynolds number (generally Re = 50~200), so the heat transfer coefficient is high, generally considered to be 3~5 times that of the shell and tube type;
2. Large logarithmic mean temperature difference and small end temperature difference
In the shell-and-tube heat exchanger, the two fluids flow in the tube side and the shell side respectively, which are generally cross-flow flow, and the logarithmic mean temperature difference correction coefficient is small, while the plate heat exchanger is mostly in parallel flow or counterflow flow, and the correction coefficient is usually about 0.95. In addition, the flow of cold and hot fluids in the plate heat exchanger is parallel to the heat exchange surface and has no side flow, thus making the end temperature difference small, heat transfer to water is not less than 1 ℃, while the shell and tube heat exchanger is generally 5 ℃;
3. Small footprint
The plate heat exchanger has a compact structure, the heat exchange area per unit volume is 2 to 5 times that of the shell-and-tube type, and the maintenance site for the tube bundle is reserved like the shell-and-tube type, so the same heat exchange is realized, and the plate heat exchanger covers an area of about 1/5 to 1/8 of the shell-and-tube heat exchanger;
4,. It is easy to change the heat exchange area or process combination, as long as the stack height is increased or decreased, the purpose of increasing or decreasing the heat exchange area can be achieved. Changing the arrangement or quantity of plates can achieve the required process combination and adapt to the new heat exchange conditions, while the heat transfer area of shell and tube heat exchanger is almost impossible to increase;
5. The thickness of aluminum foil of light-weight plate heat exchanger is only 0.1~0.2mm, while the thickness of heat exchange tube of shell and tube heat exchanger is 2.0~2.5mm. The shell and tube is much heavier than the frame of plate heat exchanger, and the plate heat exchanger is generally only about 1/5 of the weight of shell and tube;
6, the price is low
Using the same material, under the same heat exchange area, the price of plate heat exchanger is about 40% ~ 60% lower than that of shell and tube;
7, the production is convenient
The heat transfer plate of the plate heat exchanger is stamped and processed, with a high degree of standardization and mass production. The shell and tube heat exchanger is generally made by hand, and the shell is welded throughout the process;
8, easy to clean
Plate heat exchanger as long as the cleaning agent sprayed on the heat exchanger, the use of high-pressure water gun cleaning can be, which requires frequent cleaning of the equipment is very convenient;
9. Small heat loss
Only the shell plate of the heat transfer plate is exposed to the atmosphere, so the heat loss can be ignored and no heat preservation measures are required. The shell-and-tube heat exchanger has a large loss and requires a thermal insulation layer;
10. Large pressure loss per unit length
Due to the small gap between the heat transfer surfaces and the unevenness on the heat transfer surface, the pressure loss is smaller than that of the traditional smooth tube;
11, smaller size.
It is 10% ~ 20% of shell and tube heat exchanger;
12, not easy to scale
Due to the internal turbulence, it is not easy to scale, and its scaling coefficient is only 1/3~1/10 of the shell and tube heat exchanger;
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