Application conditions of finned tube in finned tube heat exchanger
In the heat exchanger, one fluid transfers heat to another fluid. Therefore, the choice of finned tube as the heat transfer element in the heat exchanger design depends on the relative value of the surface heat transfer coefficient of the two fluids.
When the surface heat transfer coefficient of the fluid inside and outside the tube is large, the fluid with small surface heat transfer coefficient should flow outside the tube, and the finned tube should be installed outside the tube to strengthen the convective heat transfer process.
When the heat transfer coefficient of the fluid surface inside and outside the tube is very small, in order to enhance the heat transfer and improve the heat transfer coefficient, both sides must be strengthened. At this time, fins can be added outside the tube, and various inserts or low fins can be used inside the tube for strengthening.