Static pressure Discharge damper SP loss

period four

Fan Modulation

notes

Discharge Dampers

static pressure

discharge damper SP loss

actual system resistance curve

design system resistance curve

airflow	Figure 82

As the VAV terminal units modulate shut, the system resistance curve shifts upwards. The fan begins to “ride up” the constant-speed performance curve, from the design operating point (A), trying to reach the balance point with this new system resistance curve. As a result, the fan delivers a lower airflow at a higher static pressure.

The system static pressure controller senses this higher pressure and sends a signal to the discharge dampers, instructing them to begin closing. This has no effect on the performance curve for the fan, but it does add a new static- pressure loss to the system. This moves the system resistance curve back down to where the system balances at an operating point along the desired fan modulation curve (B). This brings the system static pressure back down to its set point.

Other methods are more energy efficient, so discharge dampers are rarely used for supply fan modulation.

TRG-TRC014-EN

TRG-TRC014-EN specifications

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