Chemical engineering heat transfer problems? Thank you
Thread Content
In a shell-and-tube heat exchanger, where the shell-side saturated steam is used to heat the air on the tube side, what is the wall temperature of the heat transfer tubes close to – the temperature of which fluid? Why? Which fluid’s convective heat transfer coefficient is the heat transfer coefficient k close to? Why?
The temperature of the heat transfer tube wall is close to that of the saturated steam side; the steam condenses and heats the air on the tube side, with heat being transferred from the shell side into the tubes. The heat transfer coefficient is determined by the heat transfer coefficient on the steam condensation side, the heat transfer coefficient on the inner side of the tube, the fouling factor, and the material of the heat exchange tube. As can be seen from the calculation formula, the heat transfer coefficient is ultimately determined by the side with the lower heat transfer coefficient; therefore, it is close to the heat transfer coefficient at the inner wall of the tube.