Selection calculation of plate heat exchanger
The plate heat exchanger plate type or corrugated type should be determined according to the actual needs of the heat exchange occasion. For the case where the flow rate is large and the pressure drop is small, the plate type with low resistance should be selected, otherwise the plate type with large resistance should be selected instead.Depending on the fluid pressure and temperature, it is determined whether the detachable or brazed type is selected. When determining the plate type, it is not appropriate to select a plate with too small a single plate area to avoid excessive number of plates. The flow rate between the plates is small and the heat transfer coefficient is too low.
(1) Folding calculation method
The calculation of the heat transfer coefficient and the pressure drop is calculated from the performance curves of the products of various manufacturers.The performance curve (criteria correlation) is generally derived from the performance test of the product.For the type of board lacking performance test, the reference type method can also be used to obtain the board type criterion correlation according to the characteristic geometry of the board type. This method is adopted by some common softwares in the world.
(2) Folding selection software
Regarding the selection software of the plate heat exchanger, the respective manufacturers generally have their own selection software according to their own plate types.The internationally accepted software is HTRI, HTFS. General-purpose computing software is rarely disclosed. Some domestic heat exchange support websites provide online calculation software that provides plate heat exchangers for reference.