 | 1. How to classify heat exchange equipment? |
According to "Petrochemical Corporation Equipment Classification Catalog", it can be divided into:
Shell and tube heat exchanger
Double-pipe heat exchanger
Water immersion heat exchanger
Spray heat exchanger
Rotary (snake tube) heat exchanger
Plate heat exchanger
Plate-fin heat exchanger
Tube-fin heat exchanger
Waste heat boiler
Others
| 2. How does the heat exchanger transfer heat? |
In most common surface type heat exchangers, there are mainly two heat transfer methods: conduction and convection. The hot fluid first transfers the heat to one side of the tube wall by convection to heat, and then transfers the heat from one side of the tube wall to the other side by conduction, and finally the other side of the tube wall transfers the heat by convection to the heat. The heat is transferred to the cold fluid, thus completing the heat transfer process of the heat exchanger.
| 3. What is the influence of the medium flow rate on the heat transfer effect? |
The greater the velocity of the medium in the heat exchanger, the greater the heat transfer coefficient. Therefore, increasing the flow rate of the medium in the heat exchanger can greatly improve the heat exchange effect, but the negative effect of increasing the flow rate is to increase the pressure drop through the heat exchanger and increase the energy consumption of the pump, so it must be suitable range.
| 4. How does the surface structure of the heat exchange tube affect the heat transfer effect? |
Adopting specially designed heat exchange tube surface structure, such as finned tube, nail-head tube, threaded tube, etc., on the one hand, increases the heat transfer area, on the other hand, the turbulence of the special surface greatly increases the flow of the fluid outside the tube. The degree of turbulence can improve the overall heat exchange effect of the heat exchanger in both aspects, so these surface structures have better performance than the surface of the light pipe.