Description | New standard | Energy Savings
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Control, VVC plus
Traditionally, fan discharge
dampers or Inlet Guide Vanes (IGVs) are installed in the air
handling units fans to modulate the AHU capacity. These devices work
by creating resistance and pressure drop in the air entering the
ductwork or, in the case of the IGV, reducing the efficiency of the
As more VAV boxes in the system approach minimum flow, the AHU
dampers or IGVs modulate closed to maintain a constant supply duct
static pressure and a positive building static pressure. The dampers
or IGVs for the supply and return fans are commonly operated by
individual controllers. While maintaining design conditions, these
discharge dampers or inlet guide vanes do little to conserve energy.
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