Selection method of surface load of electric heating element in air heater

Everyone of us knows that the heater takes a long time, and the good performance of the single-head electric heating tube will inevitably be affected to a certain extent, which will affect the work efficiency in the later stage. It would not be cost-effective to replace them all, so we need to maintain the performance of the air heater in other ways. The following are some of our experiences in maintaining its performance when using air heaters.

1. The single-head electric heating tube increases the flow rate of the gas inlet of the air heater, which can enhance the convection heat exchange of the air heater, thereby reducing the surface temperature of the electric heating element in the air heater. In this way, it is not only beneficial to prolong the service life of the electric heating element of the electric air heater, but also reduces the heat dissipation loss of the electric air heater, so the efficiency of the air heat exchanger is also improved. However, if the speed is too high, the pressure loss will increase sharply, which will not be conducive to the improvement of heating efficiency.

2. If other conditions remain unchanged, and then the surface load is changed separately, the wall temperature of the electric heating element in the single-head electric heating tube air heater will change linearly. If the surface load increases, the wall temperature of the heating element will increase, which will reduce the service life of the heating element in the air heater. However, if the surface load is too small and the wall temperature is too low, the efficiency of the air heater heat exchanger is reduced, so the selection of the surface load of the electric heating element in the air heater is more important.