What are the advantages of air duct heaters in daily life

The air duct heater is the electric heating equipment which mainly heat the gas flow. The heating element of the air channel electric heater is made of stainless steel electric heating tube. There are many baffles (deflector) in the inner cavity of the heater, which guides the gas flow direction and prolongs the gas residence time in the inner cavity, so that the gas is fully heated, so that the gas is heated uniformly, and the heat exchange efficiency is improved. Heating element: stainless steel tube wind electric heater, electric heating wire is loaded in the seamless steel pipe, the void is filled with good heat conductivity and insulation of magnesium oxide powder after a pipe. When the current through the high temperature resistance wire, the surface of the heat pipe diffusion through the heating crystallization of magnesia powder, and then pass to the heated gas, to achieve the purpose of heating.

The advantages of using the electric heater of the air duct:

The gas flow rate increases the air entrance duct heater electric heater, electric heater can strengthen air convection, and reduced air heater electric heating elements in surface temperature, not only conducive to prolong the service life of the air heater electric heating element, and the electric air heater heat loss is reduced, so the efficiency of air heat exchanger improved. But if the speed is too large, the pressure loss increased sharply, it will not help to improve the efficiency of heating.

If other conditions remain unchanged, the change of surface load, wall temperature changes show linear electric air heater in the heating element, if the surface load increases, the wall temperature of the heating element will increase, which will reduce the heating element of air heater used in life, but if the surface load is too small, the wall temperature is too low, the efficiency of the air heater heat exchanger the reduced, so the surface load of air heater in the heating element selection is more important.

Air heater air temperature of T2 increases, due to the air viscosity increased, the gas Reynolds number decreases, the convective heat transfer intensity decreased, while increased the surface temperature of air heater in the heating element, the heat loss increased, thereby reducing the efficiency of heat exchanger. When the T2 is raised too much, the surface temperature of the electric heating element will also increase greatly, causing the general electric heating element to be unable to bear. Therefore, the increase of T2 is usually limited by the heat resistance of the electric heating element in the air heater.

The installation form of the air duct heater consists of the following:

Docking installation;

Insert type installation;

Sub - port installation;

Entrance installation and other installation methods.

According to the actual situation of the user, the user can choose a variety of appropriate installation methods.

Because of its particularity, the shell material generally made of stainless steel or galvanized plate is made, and the heating part is mostly made of stainless steel material, so when in the selection, such as material is carbon steel material production needs special instructions, to ensure the installation quality and the service life.

In control, it is necessary to add a linkage between the fan and the heater to ensure the starting of the heater, which must be carried out after the fan is started. After the heater stops working, the fan must delay more than 3 minutes to prevent the heater from overheating. In the single loop connection, it must conform to the NEC standard, and the current of each branch must not exceed 48A. The gas pressure of the channel heater is generally not more than 0.3kg/cm2. If you want to exceed the above pressure specifications, please choose a circulating heater. The maximum temperature of the low temperature heater is not more than 160 C, the medium temperature type is not more than 260 C, and the high temperature type is not more than 500.