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GOLDENSAIL
18
2022
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08
Comparison of plate heat exchangers and shell and tube heat exchangers
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1. The heat transfer coefficient of the plate heat exchanger is higher than that of the shell and tube heat exchanger. Because the different corrugated plates are inverted with each other, a complex flow channel is formed, so that the fluid rotates and flows in the flow channel between the corrugated plates. A low Reynolds number (generally Re=50-200) produces turbulent flow, so the heat transfer coefficient is high, which is generally considered to be 3-5 times that of the shell-and-tube type.
2. The logarithmic average temperature difference is large, and the end temperature difference is small. In the shell-and-tube heat exchanger, the two fluids flow in the tube side and the shell side respectively. Generally, the flow is cross-flow, and the logarithmic average temperature difference correction coefficient is small, while the plate type Most of the heat exchangers are co-current or counter-current, and the correction coefficient is usually around 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, so the plate heat exchange is The temperature difference at the end of the heat exchanger is small, and the heat exchange for water is not less than 1 °C, while the shell-and-tube heat exchanger is generally 5 °C.
3. Small footprint plate type heat exchanger has a compact structure, and the heat exchange area per unit volume is 2 to 5 times that of the shell-and-tube type. However, like the shell-and-tube type, a maintenance place for drawing out the tube bundle is reserved, so the same replacement is achieved. Heat, the plate heat exchanger covers an area of about 1/5 to 1/8 of the shell and tube heat exchanger.
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