Fan System Effects - RL Kunzrlkunz.com/news/wp-content/uploads/2016/04/Fan-System-Effects.pdf ·...
Transcript of Fan System Effects - RL Kunzrlkunz.com/news/wp-content/uploads/2016/04/Fan-System-Effects.pdf ·...
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Fan System Effects
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Outline
Fan Testing Review
Definition of System Effect
Old ASHRAE guidelines
AMCA 201 System Effect Factors
Examples
Demonstration
Aimed at the fan system designer
There are two goals:
• Avoid poor fan system configurations
• When optimum conditions cannot be met, use the
“system effect” factors to estimate any losses during
system design
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AMCA Publication 210-99
Defines
standard
methods of
testing fans for
rating purposes
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Fan Ratings
Fan ratings are established using AMCA 210
test codes that are close to ideal conditions
• Straight, uniform flow directed only in the axial
direction entering the fan
• Discharge duct long enough to allow flow to fully
develop
Uniform airflow conditions ensure consistency and
reproducibility of test results AND permit the fan to
develop its maximum performance.
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Inlet Velocity Profile
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Discharge Velocity Profile
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Typical AMCA 210
Test Set-up
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What is System Effect?
Fans in actual systems are often less than ideal
When an installation produces airflow that is not
uniform, the fan’s performance will be measurably
reduced.
The difference in performance for the same fan
tested in both conditions is the “System Effect”
In other words, anything that is placed in close
proximity before or after the fan that effects the
catalogued performance.
System Effect Factors (SEF): A factor used to
correct for system induced installation effects
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Why System
Effect is Important
If not accounted for, must accept deficient
performance, or...
• Speed up the fan (if possible)
• May require more energy to meet performance
• May exceed motor horsepower limit
Many cause excessive noise
Many cause excessive vibration
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Calculate flow resistance losses for each
component in the system
Select and position fan to avoid system effect
loss
• If loss cannot be avoided, estimate loss and
select fan for higher pressure
Two Components
of System Design
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System Resistance
System Effect Controlled by Inlet and Outlet Conditions
Ductwork Example
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Causes of
Non-Performing Systems
System resistance has been miscalculated
Fan not properly selected
Defective fan (or fan rating)
There is a system effect loss
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Fan Manufacturer’s
Responsibility
Provide accurate fan performance ratings
Provide a fan built within tolerance so that it
is capable of meeting its rating
Manufacturer is not responsible for system
resistance or system effect
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In the past…
ASHRAE published guidelines for avoiding
losses in fan performance (~1950s)
Labeled as “Right” or “Wrong” – only
qualitative
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Inlet Connections
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Outlet Connections
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Outlet Connections
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What was missing?
Only guidelines to avoid losses
No way to quantify losses
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Generated in
1973 from
ASHRAE funded
research.
Quantifies duct
system design
effect on
performance.
Known as the
bible of system
effects.
AMCA Publication 201:2002
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Normal System
Performance
Design volume
Fan curve
Calculated duct system curve
De
sig
n p
res
su
re
1
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Deficient Performance
With System Effect
Operating point is at
point 3
• Operating point is
not on fan curve!
Design volume
Original fan curve
Deficient volume
3
Calculated duct system
with no allowance for
system effect
4
System effect at actual
flow volume
De
sig
n p
res
su
re
1
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Correcting For System Effect
Design volume
Original fan curve
New fan curve
System effect loss at
design volume
2
Deficient volume
3
Calculated duct system
with no allowance for
system effect
4
System effect at actual
flow volume Actual duct system with
system effect
De
sig
n p
res
su
re
1
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With System Effects Added
The fan will be selected for the higher
pressure (no need to speed up)
The motor will be selected to include the
anticipated loss
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Causes of Losses
Inlet losses are caused by:
• Unequal loading of the fan blades (eccentric
flow)
• Improper fan blade attack angle
• Turbulence which disrupts the flow
Outlet losses are caused by:
• Loss of conversion of local high velocity into
pressure
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Inlet vs. Outlet Losses
Inlet induced losses tend to be higher than
outlet losses
Losses induced on the inlet can often exceed
20%
Losses as high as 50% have been reported
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How Losses are Quantified
AMCA 201 publishes data for a variety of
configurations
Most identify a “Loss Curve” which is based
on the configuration and identified by a letter
• Most also need the air velocity as a parameter
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System
Effect
Curves
4000 FPM
Curve T
Add 0.55 to
Static
Pressure
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Outlet System Effects
In addition to the flow velocity, may need to
know:
• effective duct length
• blast area for centrifugal fans
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System Effect Curves for Outlet Ducts –
Axial Fans
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Fan Outlet Velocity Profile
- Centrifugal
If duct is rectangular with side dimensions a x b,
the equivalent duct diameter is equal to
(4*a*b/π)^0.5
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System Effect Curves for Outlet Ducts
- Centrifugal Fans
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Outlet Duct Elbows
- Centrifugal Fans
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System Effect
Curves for SWSI Fans
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System Effect Curves for
Outlet Duct Elbows - Axial Fans
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System Effect Curves for
Inlet Duct Elbows - Axial Fans
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Percentage of
Unobstructed Inlet Area
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Fans and Plenum
L System Effect Curve
0.75 x Inlet Dia V-W
0.50 x Inlet Dia U
0.40 x Inlet Dia T
0.30 x Inlet Dia S
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Elbows Change
the Velocity Profile
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R
Lengthof Duct
Inlet with rectangular
inlet Duct
Inlet with 3-piece
elbow
Inlet with special
designed inlet box
All methods will induce some system effect loss.
Some methods are better than others
Right Angle
Turns At Fan Inlet
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R
L e n g t h o f D u c t
R
R
L e n g t h o f D u c t
L e n g t h o f D u c t
D D D
S y s t e m E f f e c t C u r v e s
R / D N o D u c t
2 D D u c t
5 D D u c t
- - N P R - S
S y s t e m E f f e c t C u r v e s
R / D N o D u c t
2 D D u c t
5 D D u c t
0 . 5 O Q S
0 . 7 5 Q R - S T - U
1 . 0 R S - T U - V
2 . 0 R - S T U - V
3 . 0 S T - U V
S y s t e m E f f e c t C u r v e s
R / D N o D u c t
2 D D u c t
5 D D u c t
0 . 5 P - Q R - S T
0 . 7 5 Q - R S U
1 . 0 R S - T U - V
2 . 0 R - S T U - V
3 . 0 S - T U V -
2 piece mitered
round section 3 piece mitered
round section
4 or more piece
mitered round section
System Effect
- Round Inlet Ducts
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Len gthof Du ct
R
System Effect Curves
R/D NoDuct
2DDuct
5DDuct
0.5 S T-U V
1.0 T U-V W
2.0 V V-W W-X
HSquare
Lengthof Duct
R
HSquare
Lengthof Duct
R
HSquare
System Effect Curves
R/D NoDuct
2DDuct
5DDuct
0.5 O Q S
0.75 P R S-T
1.0 R S-T U-V
2.0 S T-U V
System Effect Curves
R/D NoDuct
2DDuct
5DDuct
0.5 S T-U V
1.0 T U-V W
2.0 V V-W W-X
Square elbow -
no turning vanes Square elbow -
long turning vanes Square elbow -
short turning vanes
System Effect
- Square Elbow and Turning Vanes
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Pre-Rotating
Inlet Swirl
Counter-Rotating
Inlet Swirl
Forced Inlet Vortex
(Inlet Spin or Swirl)
![Page 43: Fan System Effects - RL Kunzrlkunz.com/news/wp-content/uploads/2016/04/Fan-System-Effects.pdf · Fan System Effects ... Old ASHRAE guidelines AMCA 201 System Effect Factors ... Fan](https://reader036.fdocuments.us/reader036/viewer/2022082215/5acf4cfb7f8b9ae2138c569d/html5/thumbnails/43.jpg)
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Corrections for Inlet Swirl
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Note that this is
similar to a variable
system effect.
A new curve is
generated at each
vane setting
Normalized Pressure
-Volume Curve
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Pressure Drop Multipliers for
Volume Control Dampers on a Fan Outlet
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Measured Inlet Sound Power
Blade Pass - 135 Hz
70
80
90
100
110
63 125 250 500 1000 2000 4000 8000
Fan Only 2 PC Elbow on Inlet 2 PC Elbow 3 De
Vaneaxial Fan System Effect
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System Effect
Factors are Real
When designing your fan/system, do
everything possible to avoid a “system effect”
for efficient use of energy
When conditions leading to system effect
cannot be avoided, add the calculated loss to
the fan pressure requirement at the system
design stage
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© Twin City Fan Companies
Flow Tube Example
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© Twin City Fan Companies
Reference Materials
AMCA Publication 201:2002, Fans and
Systems
Twin City Fan ED-100, Fan Performance
Troubleshooting Guide