| The plate log heat exchanger has a large logarithmic average temperature difference and a small end temperature difference. In the shell and tube heat exchanger, the two fluids flow in the tube side and the shell side, respectively, and are generally cross-flow. The logarithmic average temperature difference correction coefficient is small. The plate heat exchanger is mostly co-current or counter-current flow, and its correction coefficient is usually about 0.95. In addition, the flow of cold and hot fluid in the plate heat exchanger is parallel to the heat exchange surface and there is no side flow, so the plate type The temperature difference at the end of the heat exchanger is small, and the heat exchange for water can be lower than 1 ℃, while the shell and tube heat exchanger is generally 5 ℃. |
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