Fans

Method #1: Single Point Test

Measure: i) volumetric flow rate, ii) coincident RMS power use, iii) fan differential pressure, and iiii) fan rotational speed while the fan is at typical operating conditions.

Applications: Constant volume fan systems. Data are used to confirm design operating conditions and fan and system curves.

Steps:

• Operate fan at typical existing operating conditions for the system.

• Measure fan inlet and discharge pressure or (preferably) differential pressure.

• Measure fan flow capacity.

• Measure motor RMS power input.

• Calculate fan and energy characteristics.

Method #2: Single Point Test with Manufacturer's Curve

Measure: i) volumetric flow rate, ii) coincident RMS power use, iii) fan differential pressure, and iv) fan rotational speed while the fan is at typical operating conditions.

Applications: Variable volume systems without fan control. Data are used with manufacturer's data on the fan, motor, and drive system and engineering principles to determine power at other operating points.

Table 27.9: (Continued)
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