Transcript Document

AMCA International
Technical Seminar 2009
Energy Efficiency
Classification for Fans
John Cermak, Ph.D., P.Eng., M.Sc.
Executive Vice President
ACME Engineering and Manufacturing Corp.
The Air Movement and Control Association International
(AMCA), has met the standards and requirements of the
Registered Continuing Education Providers Program.
Credit earned on completion of this program will be
reported to the RCEPP. A certificate of completion will be
issued to each participant. As such, it does not include
content that may be deemed or construed to be an
approval or endorsement by NCEES or RCEPP.
Learning Objectives
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Learn about the current actions in fan industry leading to
immediate and long term improvement in energy
consumption by fans
Understand the choices of the corner stones for building
the AMCA Int’l initiative in ASHRAE and ISO
Learn about importance of fan total pressure for finding
energy savings
Understand how fan selection impacts energy consumption
of fans
Understand how knowledge of the fan discharge energy
contributes to successful fan selection from energy
consumption point
Learn about standardization of fan energy efficiency for
better usage of energy by fans
Fan Industry
Energy Consumption
Challenge
What is Happening?
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What is happening
ASHRAE
– 90.1 Standard (revision 2010)
– TC 5.1 Fans - ad hoc WG 90.1
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What is happening
AMCA International
– Mid-year and annual meetings 08
– Fan Committee – SC for AMCA 205
– AMCA Standard 205 “Energy
Efficiency Classification for Fans”
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What is happening
ISO/TC 117 Fans
– WG 11 Fan Efficiency
– DIS 12759 Energy Classification
for fans
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What is happening
AMCA International active in
ASHRAE
ANSI
ISO
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Purpose
Purpose
AMCA International supporting
Legislative bodies
Regulatory bodies
in U.S.A.
as well as in other countries
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Purpose
Establishing ways and goals
to achieve significant energy
savings in usage of fans
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Purpose
Making the application of fans
fitting the energy consumption
goals without making it difficult
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Corner Stones
Corner Stones
Fan energy efficiency based
on fan total pressure
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Corner Stones
Tool for regulative bodies
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Corner Stones
Support fan manufacturers’
effort to improve the energy
efficiency of their products
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Corner Stones
As much as possible keep one
series in one efficiency grade
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Corner Stones
Fan peak total efficiency of a fan
series is dependent on fan size
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Corner Stones
Defining areas of responsibility for:
Fan manufacturer
Motor manufacturer
HVAC system designer
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Fan Total Pressure
Why?
Total or Static?
Fan creates pressures:
dynamic (velocity)
and
static
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Total or Static
Both pressures are also specific
energies a unit of flow exerted
into the air by a fan
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Total or Static?
• Fan is a device to create air
flow as its primary function
• The motion of the air carries
dynamic (velocity) energy
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Total or Static?
Fan total pressure is sum of
dynamic (velocity) pressure
and
static pressure
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Answer
For fan selection are needed
at least two from the three fan
pressures:
total and velocity
static and velocity
total and static
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Fan Selection
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Fan Selection
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Fan Selection
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Fan Selection
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Fan Selection
• Matching the pressure drop
across the system against fan
static pressure does not give the
correct flow, fan size and power
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Fan Selection
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Fan Selection
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Using Fan Discharge
Energy
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Using Discharge Energy
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Using Discharge Energy
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Using Discharge Energy
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Fan Characteristics
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Fan Energy Efficiency
• Fan is a device creating air flow
and transferring energy from the
motor into the air
• Fan Total Pressure is the total
energy exerted into air by fan
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Fan Energy Efficiency
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Fan Energy Efficiency
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Fan Energy Efficiency
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Fan Energy Efficiency
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Fan Energy Efficiency
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Fan Energy Efficiency
Fan energy (total) efficiency
Fan total energy
Energy from motor
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pTE
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pTE
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pTE
The characteristic
of the fan energy
transformation
quality is
fan peak total efficiency
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pTE
Fan total efficiency
changes along the
fan pressure curve
significantly
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Fan size and pTE
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pTE
At constant tip speed the fan
pTE of a fan Series changes
with the fan size
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pTE and Fan Size
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pTE and Fan Size
As a base fan
size was chosen
impeller size of
1000 mm (40”)
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Fan Size Effect
The Size Effect includes effects
–Reynolds number
–changes in flow pattern
–impact of volumetric and
mechanical losses
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Fan Size Effect
The Size Effect includes effects
–deviations from geometrical
similarity from size to size
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Fan Size Effect
The character of the Size Effect
changes from one fan Series to
another
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Design of FEG System
FEG = Fan Efficiency Grade
FEG System
90
FEG90
FEG85
80
FEG80
Optimum (peak) fan efficiency(%)
FEG75
70
FEG71
FEG67
FEG63
60
FEG60
FEG56
FEG53
50
FEG50
40
30
20
0
100
200
300
400
500
Fan size (mm)
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600
700
800
900
1000
FEG System
• Grade labels in preferred
numbers
e.g. FEG 80, 71, 63 etc.
• Layer thickness is 6%
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Grade Label
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Grade Label
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Grade Label
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Grade Label
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Grade Label
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Grade Label
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Attached Conditions
Using these conditions would
yield the fastest energy
savings
Off Peak Load
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Off Peak Load
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Off Peak Load
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Off Peak Load
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Off Peak Load
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Off Peak Load
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Off Peak Load
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Off Peak Load
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Off Peak Load
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Off Peak Load
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Off Peak Load
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Off Peak Load
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Off Peak Load
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Part Load
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Part Load
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Part Load
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Part Load
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Part Load
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System Effects
Restrictions on usage of “system
effects”
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Result
Defined Areas of
Responsibility
Areas of Responsibility
Fan manufacturer
Offers fans with the highest pTE
now at least FEG 67 later 71
and direct driven units
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Areas of Responsibility
Motor manufacturer
Offer motors with highest pEff
and smart units
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Areas of Responsibility
HVAC system designer
Optimizes use of the selection
of the fan and the motor incl.
drive package)
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Areas of Responsibility
What is missing?
User of HVAC
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Questions?
Thank You
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