Design and calculation of plate heat exchangers
Thread Content
During the design of plate heat exchangers, it is necessary to determine the size of the heat exchanger plates. This size is determined based on the flow velocity at the corner ports, which is generally 6 m/s. What exactly does this flow velocity at the corner ports mean? Baidu does not provide a specific explanation; do the teachers at Haichuan know?
Could we ask Teacher @wiseboy for some guidance?
The corner hole flow velocity refers to the flow speed of the medium at the ports of the plate heat exchanger plates. Generally, it should not exceed 6 m/s during design. If the size of the heat exchanger ports is similar to that of the corner holes in the plates, then the flow velocity at those ports should be used to determine the appropriate model and size for the heat exchanger. It’s similar to pipeline design: if the flow rate is too high, a pipeline with a larger diameter should be chosen. The corner hole sizes of plate exchangers generally increase from small to large, for example: 20mm, 25mm, 30mm, 50mm, 65mm, 80mm, 100mm, 125mm, 150mm, 200mm, 250mm, 300mm,… with a maximum of up to 500mm. However, the specific model to be chosen for design depends heavily on other factors such as pressure drop and LMTD. Typically, selecting the appropriate model is the responsibility of the plate exchanger manufacturer, and users do not need to be aware of this.