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Plate Heat Exchanger Characteristics
Dec 07, 2017

First, the heat transfer coefficient high plate heat exchanger has a high heat transfer coefficient, which is generally about 3~5 times of the tube shell heat exchanger. The main reason is that when fluid flows through the shell side of shell and tube heat exchangers, there are baffles, shells, baffles, heat exchangers, and the bypass between tube bundles and shells. The plate heat exchanger has no bypass, and the corrugation of the plate can make the fluid generate turbulence at a relatively small flow rate. The effect of turbulence is obvious (when the Reynolds number is about 150, that is turbulence), so a high heat transfer coefficient can be obtained.

Two, the logarithmic average temperature difference large plate heat exchanger two kinds of fluid can realize the pure countercurrent, usually in the way of downstream or countercurrent. However, in shell and tube heat exchangers, two kinds of fluids flow in shell and tube processes respectively. In general, it is the flow of the wrong flow. The logarithmic mean temperature difference is reduced. The plate heat exchanger can achieve temperature crossover, the terminal temperature difference can reach 1 degrees, and the shell and tube heat exchanger can not achieve temperature crossover (that is, the outlet temperature of the two side outlet can not be higher than the outlet temperature of the primary side), the terminal temperature difference can only reach 5 degrees.

Three, NTU large NTU shows the heat transfer capacity of the heat exchanger relative to the heat capacity flow of the fluid. For example, for the established heat transfer coefficient K and heat capacity GCp, the size of the NTU means the size of the heat exchanger, that is, the size of the heat transfer area. The NTU of the shell and tube heat exchanger is about 0.2~0.3 (average 0.25). (BRS) the NTU of the plate heat exchanger is about 1.0~3.0 (average 2). For example, when the water is 14~9 C, two water is 13~7 C, the water flow is 60m3/h, and the two water flow is 50m3/h, NTU= (14-9) /1.5=3.33. If the symmetric type heat exchanger (BRS) 3.33/2.0 = 1.66 ~ 2 A=95m2; and the process of tube shell heat exchanger, it is 3.33/0.25=13.32 14 A=320m2 process.

Four. The pressure bearing capacity of the design is up to 8MPa, and the design temperature is 1000.

Five. The size of the large scale veneer is 18m2, and the single table is 10000m2. Six. The size of the miniaturized veneer is smaller than that of A4.

Seven, small area of area from third analysis, because the plate heat exchanger NTU large, so the same heat exchange, the size of the heat exchanger is small. Besides, the plate heat exchanger has compact structure, the heat transfer area in the unit volume is 2~5 times of the shell and tube heat exchanger, and there is no need for the shell and tube heat exchanger to draw out the repair field of the tube bundle. Therefore, the plate heat exchanger occupies an area of 1/5~1/10 of the shell and tube heat exchanger.

The thickness of the plate eight, light weight of the plate heat exchanger is only 0.6~0.8mm, shell and tube type heat exchanger tube thickness is 2.0~2.5mm; tube shell heat exchanger heat exchanger than frame weight is much heavier; the heat at the same heat transfer area for heat exchanger than tube shell type the heat exchanger is small, the weight is about shell and tube 1/5.