period four

Fan Modulation

notes

In response to reduced airflow and rising system static pressure, the variable- pitch vaneaxial fan responds similarly to a centrifugal fan with either inlet-vane or variable-speed capacity control.

By changing the angle of the fan blades, the performance curve for the fan shifts downward, and the airflow and resulting pressure decrease until the operating point (B) balances along the fan modulation curve.

Fan Modulation Comparisons

 

100

 

 

BI fan with

 

 

 

 

 

 

90

 

 

discharge

 

 

 

 

 

 

80

 

 

dampers

 

 

 

 

 

 

power

70

AF fan with

 

 

 

 

 

 

 

60

inlet vanes

 

 

 

 

FC fan with

% design

50

FC fan with

 

 

 

 

 

 

 

 

inlet vanes

40

discharge

 

 

 

fan-speed

 

 

30

dampers

 

 

 

 

 

 

20

 

 

 

 

 

control

 

 

 

 

 

 

 

variable-pitch

 

 

 

 

 

10

 

 

 

 

 

 

 

 

 

 

 

vaneaxial

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

10

20

30

40

50

60

70

80

90

100

 

 

% design airflow

Figure 89

These curves describe the performance characteristics of each fan modulation method, in terms of the fan power required versus the percent of design airflow. Realize that these are generalized curves based on an arbitrary set of test conditions.

On a generalized basis, the forward-curved (FC) centrifugal fan with inlet vanes, the variable-pitch vaneaxial fan, and fan speed control are similar in performance.

To obtain a more accurate comparison for specific operating conditions, a life- cycle cost analysis should be performed.

TRG-TRC014-EN

63

Page 68
Image 68
Trane TRG-TRC014-EN manual Fan Modulation Comparisons, BI fan with Discharge Dampers

TRG-TRC014-EN specifications

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