Energy Savings
Total Circulation |
NC
Values
Applause Diffusers are very quiet. Sound pressure levels (SPL) never exceed
ambient background SPL up through flow rates of 1,000 FPM. At 1,000 FPM the
NC value of our diffuser was 22. At 1,500 FPM the NC value was 33. These
values are consistently quieter than the competitors diffuser tested, which
had NC values ranging from 23 at 600 FPM to 44 at 1,500 FPM.
Layout
Draw throw radius circles uniformly around the diffusers. For high
air-change design, the throw patterns may show over-lap and wall
interference. For low air-change, there may be space between patterns and
walls. This is OK. Do not try to throw to the furthest corner of the room.
The kinetic energy supplied by each jet will gently drive the air mixture
to the furthest wall. The mixture will hug the ceiling because of the
Bernouli velocity pressure effect, and the zero relative weight of the air
at the stabilization temperature.
Field
Adjustment
To find the design velocity of each diffuser, divide design CFM by the
outlet area of the desired diffuser (see Performance Table). Read the
average diffuser outlet air velocity with an appropriate air velocity meter
(like a Dwyer #460). Do not use a volume instrument. Adjust the branch duct
damper to obtain the design velocity.
Performance
Table
Diffuser Size |
Nozzle Velocity,
FPM |
300 |
400 |
500 |
600 |
700 |
800 |
Duct
Size
Inches |
|
Velocity Press.,
wc, VP
CC or CCT; (VPx1.1) = TP
CS; (VPx2.25) = TP |
.006
.007
.014 |
.010
.011
.023 |
.016
.018
.036 |
.022
.024
.050 |
.030
.033
.068 |
.040
.044
.090 |
| |
|
NC VALUE |
- |
- |
- |
- |
- |
- |
6/8
|
|
Flow Rate, CFM
CC or CCT; Throw, Ft.
CS; Throw, Ft. |
105
4
6 |
140
4
6 |
175
4
6 |
209
4
6 |
244
4
6 |
279
4
6 |
| |
|
NC VALUE |
- |
- |
- |
- |
- |
- |
10/12
|
|
Flow Rate, CFM
CC or CCT; Throw, Ft. |
236
6 |
314
6 |
393
6 |
471
6 |
550
6 |
628
6 |
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· System Resistance
Diffuser has unusually low pressure drop. Refer to the
first four lines of Performance Table for Velocity & Total Pressure
(VP and TP).
· The Throw in the
Performance Table is the radial distance from the center of the
diffuser to a point where the jet mixture slows to 50 FPM. |
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