Can a tubular heat exchanger and a plate heat exchanger with the same heat exchange area be used interchangeably?
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The unit has plate heat exchangers with a heat exchange area of 10 square meters, and they are planned to be replaced with tube heat exchangers. Is the heat exchange area of the replaced tubular heat exchanger still 10 square meters? Why? Thank you! ! ! ! !
Of course they can’t be swapped!!! The design of a heat exchanger depends on many factors; the same heat exchange area is just one of those factors! What about pressure? What about temperature?
In terms of heat transfer efficiency alone, plate heat exchangers have a higher heat transfer coefficient, but this depends on the structure of the heat exchanger
These definitely cannot be interchanged. The heat transfer coefficient of plate heat exchangers is much higher than that of tube heat exchangers; therefore, under the same operating conditions, the two types cannot be used interchangeably.
What kind of operating conditions are involved? Plate exchangers are generally suitable for applications with moderate pressure and temperature levels, while shell-and-tube exchangers are better suited for situations with higher pressure and temperature. You can first list the technical parameters; this will make it possible to do some calculations.
It must be impossible to replace it; ignoring other factors and considering only heat transfer, it will not meet the requirements, as the heat transfer coefficient of plate heat exchangers is much higher than that of shell-and-tube heat exchangers. After replacement, it certainly will not satisfy the process heat transfer requirements.
I feel that the operating conditions for which plate heat exchangers are suitable are also applicable to shell-and-tube heat exchangers; their range is greater than that of plate heat exchangers. The main thing to consider is what types of fluids are on each side, and a detailed design is still required even after changing the structural format of the heat exchanger
If a tubular heat exchanger is used, the area required would be much larger; under the same conditions, a plate heat exchanger has a much higher efficiency
In terms of heat transfer efficiency, the heat transfer coefficient of plate heat exchangers is much higher. However, due to the limitations imposed by the sealing strips, plate heat exchangers cannot operate at very high pressures and temperatures. You plan to replace the plate heat exchanger with a tube heat exchanger; the pressure and temperature requirements are fine. The heat exchange area needs to be increased, and it is also necessary to consider whether there is enough space for installation on site (plate heat exchangers require less space for installation compared to tube heat exchangers), as well as any constraints on the piping.
It also depends on the operating conditions of the fluid, whether there are any restrictions.
Determine the heat transfer rate, and then redesign the heat exchange area of the heat exchanger based on the design manual. Generally, shell-and-tube heat exchangers have a larger heat transfer area
With the medium pressure and temperature at the site remaining unchanged, if the design is changed from plate-type to tube-type, by how much must the heat exchange area be adjusted? What are the heat transfer coefficients of the two types of heat exchangers?
The heat transfer coefficient of plate heat exchangers is higher than that of tube heat exchangers, but their pressure loss is also relatively higher. Under the same operating conditions, the flow regime has a significant impact on the heat transfer coefficient; in other words, it comes down to the flow velocity. The heat transfer coefficient in a turbulent flow state is 2 to 5 times higher than that in a laminar flow state.
It cannot be replaced, as the heat transfer coefficient of plate heat exchangers is higher than that of tube heat exchangers. Formula for calculating heat transfer in a heat exchanger: Q=KAΔtm (where Q is the heat transfer amount) ； K: Heat transfer coefficient ； A: Heat exchange area ； Δtm: average temperature difference). Based on this formula, it can be concluded that if the heat transfer area remains unchanged, then the heat transfer rate will **decrease** when using tubes instead of plates, and the desired heat transfer effect will not be achieved.
Generally, it’s not possible; it depends on whether the material is suitable for use with this type of heat exchanger. Additionally, the heat transfer coefficients need to be compared, as they usually differ significantly.
If the heat exchange area is the same, it can be replaced
They can’t be interchanged; the heat transfer coefficient of a plate heat exchanger is higher than that of a tubular heat exchanger
Plate heat exchangers have a high heat transfer coefficient, and shell-and-tube heat exchangers are used in a wide range of applications. If replacing a plate heat exchanger with a shell-and-tube one, it is necessary to redesign the system, taking into account various factors such as pressure, temperature, type of fluid, application scenario, and site conditions.
It cannot be replaced; there’s no need to worry about operating temperature or pressure. The main reason is that the heat transfer coefficient of plate heat exchangers is much higher than that of shell-and-tube heat exchangers, so it’s necessary to recalculate based on the flow conditions. You can also send the data over so that I can help you calculate and select the appropriate option.
It’s not simply a question of whether it’s possible to make the replacement; first, it’s necessary to determine whether the tubular heat exchanger can meet the process requirements.