There are two ways of ventilation and draught:
① blast Type: Air flow through the ventilation fan into the tube.
② Wind Type: The air flows through the tube bundle into the ventilator.
The former operating cost of the economy, the resulting turbulence is beneficial to heat transfer, use more, the latter distribution evenly, favorable temperature control, noise, is the direction of development.
The temperature of the heat flux outlet is controlled by adjusting the air volume of the tube bundle, i. e. Adjusting the inclination of the blade, the speed of the ventilator and the opening degree of the shutters. For winter Yi Ning and frozen fluids, the temperature of the fluid outlet can be regulated by the method of hot air circulation or steam heating.