Heat exchanger selection
Thread Content
I would like to ask all the experts, how to choose a heat exchanger and what factors should be considered?
Please refer to the download address of the Heat Exchanger Selection and Design Guide http://bbs.hcbbs.com/viewthread.php?tid=250433&highlight=%C8%C8%BD%BB%BB%BB%C6%F7 There have been related discussions in the forum before http://bbs.hcbbs.com/viewthread.php?tid=349248&highlight=
In one sentence, you can find the selection criteria based on actual working conditions and find them in this book.
If you are not engaged in this design, just provide the working conditions directly to the manufacturer, and they will design it for you free of charge.
This question is really difficult to answer. Of course, the heat exchanger is based on the applicable conditions and the purpose to be achieved, and many aspects are considered. And there are many types of heat exchangers now, and what you said above is correct.
1. The heat exchanger must meet the requirements of process conditions. The material and structure type of the heat exchanger must be determined by comprehensive consideration of process conditions such as pressure, temperature, physical and chemical properties, and corrosiveness. 2. The heat transfer efficiency must be high. In order to improve the heat transfer efficiency of the heat exchanger, the heat transfer coefficient of the fluid must be increased and the thermal resistance must be reduced. This issue should be fully considered when determining the structural type of heat exchanger. If the heat transfer coefficients of the two fluids for heat exchange are similar and the temperature difference is not large, you can choose a tube-type heat exchanger. ； If the temperature difference is large, a tube heat exchanger with expansion joints should be selected. ； If the temperature difference is large, a floating head heat exchanger should be selected ； If the heat transfer coefficients of the two fluids are very different and one of the fluids is gas, a finned tube heat exchanger should be selected. ； If both fluids are gases and the heat transfer coefficient is very small, a plate-fin heat exchanger should be selected. 3. The fluid resistance loss should be small. The fluid resistance loss of the heat exchanger is directly related to the power consumption. Although increasing the flow rate can improve the heat transfer coefficient, the power consumption of the pump or fan for transporting the fluid is too large, and it is not economical. Therefore, the flow rate of the fluid should be appropriate. You can refer to the relevant design manual to determine a reasonable fluid flow rate.
First of all, it depends on where it is used, what conditions and what kind of process requirements, such as the outlet temperature requirements. For example, if the outlet temperature should be below 40 degrees, the air cooler will definitely not work. The poster can be more specific.