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