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TRG-TRC013-EN manual Fan Performance Curve, static pressure, airflow, g DN, wide-open
Models:
TRG-TRC013-EN
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Constant-VolumeSystem
Input Power
Page 19
Image 19
g
Fan Performance Curve
blocked-tight
static pressure
static pressure
wide-open
airflow
airflow
g DN
fwt” p v
r—”
[—
r—2
2
78
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Page 18
Page 20
Page 19
Image 19
Page 18
Page 20
Contents
Page
3600 Pammel Creek Road La Crosse WI
BUSINESS REPLY MAIL
BUSINESS REPLY MAIL
THE TRANE COMPANY Attn Applications Engineering
One of the Equipment Series
Comment Card
Response Card
Air Conditioning Fans
Worldwide Applied Systems Group
p e The Trane Company
A Trane Air Conditioning Clinic
Air Conditioning Fans
99999999999999999999999999999
caQ3caM6793O
axial centrifugal
Air Conditioning Fans
atmospheric ductpressure pressure
period one
Measuring Pressure
Air Conditioning Fans
are “water gage” wg and “water column” wc
Positive Duct Pressure
fwt” p 2 p ”tvp rp S” r“- 4 jK 7683-- r-“4lcwt
R-2 x”rwt
reservoir
Inclined Manometer
duct
pressure
Velocity Pressure vs. Static Pressure
Total Pressure
damper fully open
Velocity Pressure vs. Static Pressure
Velocity Pressure vs. Static Pressure
g DC
g DE
Measuring Static Pressure
Velocity Pressure vs. Static Pressure
g DD
Measuring Total Pressure
g DG
Fan Performance Test
Airflow = Velocity ⋅ Fan Outlet Area
Determining Fan Airflow
Velocity Pressure Pv = Pt - P s
Velocity V = Constant ⋅ √ Pρ
2.0 in. H2O
Plotting Fan Performance Points
Plotting Fan Performance Points
static pressure
airflow
Fan Performance Curve
static pressure
airflow
Fan Speed
Fan Surge
Input Power
Percent of Wide-OpenAirflow
Fan Surge Line
g EG
Tabular Performance Data
fan’s speed and input power requirement
Pp” -p”
System Resistance
System Resistance
Static Pressure
System Resistance Curve
Static Pressure
Airflow
System Resistance Curve
Fan - System Interaction
Fan - System Interaction
Lower System Resistance
Higher System Resistance
Airflow ⋅ Static Pressure
Power Out Static Efficiency SE = Power In
SE = Constant ⋅ Input Power
Static Efficiency
⋅ 1.5 kW
3,500 cfm ⋅ 2.0 in. H2O
= 55%
1.65 m3/s ⋅ 491 Pa
pressure
Constant-VolumeSystem
design system
resistance curve
g FH
Variable-PitchVaneaxial Fan
variable-pitch blades
airflow
total pressure
surge region
85% 80% 70%
angl
total pressure
surge region
g FM
g FN
period two
Centrifugal Fan
Air Conditioning Fans
cwt r
Forward Curved Fan
Forward Curved Fan
cwt ux r2 - PM2 up” PM up” r-” -t
application
Forward Curved Fan
static efficiency
50 to 65%
Backward Inclined Fan
Backward Inclined Fan
FC vs. BI Fans
forward curved
backward inclined
cwt p“xrp
Backward Inclined Fan
backward curved
Backward Curved Fan
Airfoil Fan
backward inclined
80 to 86%
Plug or Plenum Fan
Airfoil Fan
static efficiency
straightening vanes fan wheel or impeller
Vaneaxial Fan
g HF
static efficiency
Vaneaxial Fan
Variable-PitchVaneaxial Fan
application
g HI
surge region
pressure
airflow
Vaneaxial
Fan Selection
Forward curved FC
Backward inclined BI or airfoil AF
K 9e“5
period three
VAV System
Air Conditioning Fans
S” p eKe
Riding the Fan Curve
“Riding the Fan Curve”
VAV System
Forward Curved Centrifugal Fan
Fan Control Loop
VAV System Modulation Curve
Variable-pitchblade control
Methods of Fan Capacity Control
Discharge Dampers
Discharge dampers Inlet vanes Fan-speedcontrol
upward. The fan begins to “ride up” its constant-speedperformance curve toward f, from the design operating point e, trying to balance with this new system resistance curve. As a result, the fan delivers a lower airflow at a higher static pressure
Discharge Dampers
Inlet Vanes
Inlet Vanes
upward. The fan begins to “ride up” its current vane position curve toward f, from the design operating point e, trying to balance with this new system resistance curve. As a result, the fan delivers a lower airflow at a higher static pressure
Inlet Vanes
Fan-SpeedControl
Fan-SpeedControl
variable-pitch blades
Variable-PitchBlade Control
p“-”vKe
g MF
e eK/ up”
cwt t
design airflow
Fan Control Comparison
power
discharge
Air Conditioning Fans
period four
g MI
VAV supplyterminal units fan
System Static-PressureControl
controller
sensor
Optimized Static-PressureControl
System Effect
System Effect
Acoustics
Use adequate vibration isolation
Acoustical Guidelines
Minimize system effects
Avoid rectangular sound traps, if possible
Densityactual
Effect of Actual Conditions
5 Poweractual = Air Density Ratio ⋅ Powerstandard
1 Air Density Ratio =
Purpose
Equipment Certification Standards
Review-PeriodOne
period five
Air Conditioning Fans
“Riding the fan curve” Discharge dampers
Review-PeriodTwo
Review-PeriodThree
axial centrifugal
System static-pressurecontrol System effect
Review-PeriodFour
Application considerations
g NO
cp”t Kx
Page
DDList two possible causes of system effect
NLt -”trp” wp”s“t wxvwt PO up”4
E F 64 x”4 R8 j78 pl e F 82A98 u- j7
cbt L
bndb Kx
“riding the fan curve” K -tsx
9bw5
FLCC t e
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