ABSTRACT
The constant static pressure method was the commonly used fan control method. In most cases, a static pressure sensor is generally located two-thirds downstream in a main supply air duct (Shim et al. 2014, Zhang et al. 2010) although it is no longer recommended by ASHRAE. However, for mines and other large-scale underground areas, which have long distance pipe networks, more complex systems and changeable operation conditions, it is difficult to determine where and how many static pressure sensors should be placed, and the energy-saving effect is also difficult to guarantee (ASHRAE 2011).
