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A. High heat transfer coefficient because different corrugated plates are inverted from each other, it constitutes a complex runner, which makes the fluid rotate three-dimensional flow in the flow channel between corrugated plates, and can produce turbulence under the lower Reynolds number (general re=50~200), so the heat transfer coefficient is high, which is generally considered to be the 3~5 times of the tubular shell type.
B. The logarithmic average temperature difference is large, the end temperature difference is small in the tube-shell heat exchanger, the two fluids flow in the outlet flanges and Shell, respectively, the flow of staggered flow, the logarithmic average temperature difference correction coefficient is small, and the plate heat exchanger is mostly a flow or countercurrent flow mode, its correction coefficient is usually around 0.95, in addition, cold,
The flow of the hot runner in the plate heat exchanger is parallel to the heat transfer surface and no side flow, so the end temperature difference of the plate heat exchanger is small, the water heat transfer can be less than 1 ℃, and the tube-shell heat exchanger is generally 5℃fff.
C. The floor area of small plate heat exchanger compact structure, unit volume of heat transfer area for the shell type of 2~5 times, and not like the shell type to reserve the control site of the extraction bundle, so the realization of the same heat transfer, plate heat exchanger covers an area of about the tube-shell heat exchanger 1/5~1/8.
D. Easy to change the heat transfer area or process combination, as long as the addition or reduction of a few plates, can achieve the purpose of increasing or reducing the heat exchange area, change the plate arrangement or replace a few plates, you can achieve the required process combination, adapt to the new heat exchange conditions, and the pipe shell heat exchanger is almost impossible to increase.
E. Lightweight plate heat exchanger plate thickness is only 0.4~0.8mm, while the thickness of the tube-shell heat exchanger pipe is 2.0~2.5mm, the shell shell is much heavier than the frame of the plate heat exchanger, plate heat exchanger is generally only about 1/5 of the weight of the shell type.