There are two main types of plate heat exchangers: frame type (detachable type) and brazing type. There are three main types of plates: herringbone corrugated plates, horizontal straight corrugated plates and knob-shaped plates.
Plate heat exchanger is a new type of high-efficiency heat exchanger composed of a series of metal sheets with a certain corrugated shape.Thin rectangular channels are formed between the various plates, and heat exchange is carried out through the plates.
Plate heat exchanger is an ideal equipment for liquid-liquid and liquid-steam heat exchange.It has the characteristics of high heat exchange efficiency, small heat loss, compact and light structure, small footprint, easy installation and cleaning, wide application and long service life.
Plate Heat Exchanger Selection
When selecting a plate heat exchanger, it is necessary to clarify customer needs, system operating conditions, media, pressure and temperature, and select the model based on specific parameters to ensure the heating effect.
It is necessary to determine the basic parameters and decide the heat exchange area of the heat exchanger according to the supply and return water temperature of the primary and secondary networks, the heat exchange capacity or the heating area. Identify the medium type (such as water, steam, oil) and corrosiveness to determine the material of the plate.rs.
Plate type selection: If the flow rate is large and the pressure drop is small, choose a plate type with small resistance; if the flow rate is small and the pressure drop is large, choose a plate type with large resistance.
Plate material: Stainless steel 304 and 316L are generally suitable for water or oil media. Titanium alloy is suitable for highly corrosive media.
The selection of plate heat exchanger is to select the area of the plate. There are two main methods for its selection.But both of these are difficult to understand and require a lot of thermal calculations, etc.Usually we use the simplest formula:
Q=K×F×△t
K: heat transfer coefficient
Q: Heat load
F: heat exchange area
△t: Heat transfer temperature difference (usually logarithmic temperature difference)
The heat transfer coefficient depends on the structure of the heat exchanger itself. Each plate with different flow channels has its own empirical formula.If you are not strict, you can take 2000~3000; we need to leave a certain margin for the final calculated area of the board, generally multiply it by a coefficient such as 1.10~1.25.
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