What are the characteristics of plate heat exchangers? A plate heat exchanger manufacturer in Jinan helps you solve your doubts.
Release time:
2022-07-04 12:03
Source:
Jinan Plate Heat ExchangerManufacturer believesThe heat transfer plate is the core component of the heat exchanger, and its forming process and material characteristics will directly affect the sealing and heat transfer efficiency. Usually, water is used as the cooling medium in the heat exchanger, and the plates are mostly made of stainless steel. The plates are embossed with corrugated flow channels, and the space between two adjacent plates is the medium flow channel. When cold and hot fluids flow on both sides of the plate, they exchange heat through the plate.
Jinan Plate Heat ExchangerManufacturer believesThe special channels formed by the corrugations allow the fluid to become turbulent at a very low velocity(Reynolds number Re is approximately 200). The turbulence of the low Reynolds number itself has a descaling effect, effectively breaking the adiabatic boundary layer and reducing the thermal resistance of the interface liquid film. The general heat transfer coefficient K of a plate heat exchanger is in the range of 3000 ~ 6000 W, and the two media are almost countercurrent, so the heat transfer efficiency is high. Under the same heat transfer efficiency, the plate heat exchanger only needs 1/2 ~ 1/4 of the area of a shell and tube heat exchanger to achieve the same heat exchange effect.
Jinan Plate Heat ExchangerManufacturer believesPlate heat exchanger useAfter 1-2 years (depending on the actual operating conditions), disassembly, cleaning, pressurization, and testing are required. Defective plates, such as deformation or perforation, should be replaced in time. During this process, the assembly of the heat dissipation plate must strictly follow the flowchart. The flowchart is designed according to the cooling process, and the plates are connected in parallel or series. Common ones include single-flow and double-flow (or multi-flow combination) heat exchangers. The inlet and outlet nozzles of a single-flow heat exchanger are usually fixed on one side of the end plate, and the hot and cold media are arranged on one side of the vertical axis of the fixed end plate, with the same medium on the left or right side at the same time.
Jinan Plate Heat ExchangerManufacturer believesAfter disassembly and inspection of the plate heat exchanger, it needs to be re-clamped as required. If plates need to be installed to further improve the heat exchange capacity, the deformation strength of the fixed pressure plate and the movable pressure plate should be fully considered. The same level of experimental pressure should be used, the number of plates will increase, and the pre-tightening force of the bolts also needs to be increased. When the elastic deformation of the two side pressure plates exceeds the allowable range, the compressed plane of the seal will slide radially, causing misalignment. At this time, the seal will fail, and the two media will leak to each other or leak in, making it impossible to use normally.
Jinan Plate Heat ExchangerManufacturer believesFor heat exchangers that have not been used for a long time, it is usually necessary to properly loosen the tension of the screws. After the plates and gaskets are under pressure for a long time, they lose the necessary elasticity, the seal is easily damaged, and the service life is reduced. The force on each tightening bolt of the heat exchanger is uniform. Before installation, the plates should be clamped diagonally, and the internal distance between the two pressure plates should be measured in real time to ensure that the two pressure plates are basically parallel, and the parallelism deviation of the four corners is less than2%.
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