The fan is the only energy-consuming component in the air handling unit. Similar to general fans, when ordering, the appropriate fan type should be selected based on the relationship between airflow and pressure head, such as forward-curved or backward-curved blades, to ensure optimal noise and efficiency. In recent years, airfoil fans imported from abroad have demonstrated high efficiency.
With the development of computer technology and the improvement of automatic control levels, variable air volume (VAV) systems are increasingly widely used in office buildings, clean rooms, hospitals, and other settings, thus placing new and higher demands on the selection of supply and return air fans in air handling units. Firstly, the fan's characteristic curve should have a smooth curve, so that the system avoids unnecessary static pressure increases when airflow decreases. Secondly, the selected fan should operate within a relatively stable, high-efficiency range. Thirdly, the return/exhaust fans should be the same model or type as the supply fans and have similar performance characteristics to ensure effective matching of the entire system during operation.
