period four

Fan Modulation

notes

Fan Modulation Curve

pressure

VAV system

static

modulation curve

 

sensor set point

airflow

Figure 77

 

Fan Modulation Curve

The fan modulation curve illustrates the static pressure requirement of the VAV system over the range of airflows. This requirement consists of a fixed component and a variable component.

The VAV system requires a minimum amount of static pressure to properly operate the terminal-unit modulation devices and diffusers. This static pressure is the fixed component.

The second component of this static pressure curve is variable. This is the amount of static pressure required to overcome the system pressure losses due to the ducts, fittings, coils, filters, and so forth, at various airflows. These losses vary with changes to the system airflow.

This curve describes the fan modulation needed to balance the static pressure that is required to offset these variable system losses (demand) with the static pressure produced by the fan (supply).

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TRG-TRC014-EN

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Image 61
Trane TRG-TRC014-EN manual Fan Modulation Curve

TRG-TRC014-EN specifications

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