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AMCA International January 2009 Chicago, IL. Energy Efficiency Classification for Fans John Cermak, Ph.D., P.Eng ., M.Sc. Executive Vice President ACME Engineering and Manufacturing Corp. Fan Industry. Energy Consumption Challenge. What is Happening?. What is happening. ASHRAE

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Amca international january 2009 chicago il

AMCA InternationalJanuary 2009Chicago, IL

Energy Efficiency Classification for Fans

John Cermak, Ph.D., P.Eng., M.Sc.

Executive Vice President

ACME Engineering and Manufacturing Corp.


Fan industry

Fan Industry

Energy Consumption Challenge



What is happening1
What is happening

ASHRAE

  • 90.1 Standard (revision 2010)

  • TC 5.1 Fans - ad hoc WG 90.1

4


What is happening2
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”

5


What is happening3
What is happening

ISO/TC 117 Fans

  • WG 11 Fan Efficiency

  • DIS 12759 Energy Classification

    for fans

6


What is happening4
What is happening

AMCA International active in

ASHRAE

ANSI

ISO

7



Purpose1
Purpose

AMCA International supporting

Legislative bodies

Regulatorybodies

in U.S.A.

as well as in other countries

9


Purpose2
Purpose

Establishing ways and goals

to achieve significant energy

savings in usage of fans

10


Purpose3
Purpose

Making the application of fans

fitting the energy consumption

goals without making it difficult

11



Corner stones1
Corner Stones

Fan energy efficiency based

on fan total pressure

13


Corner stones2
Corner Stones

Tool for regulative bodies

14


Corner stones3
Corner Stones

Support fan manufacturers’

effort to improve the energy

efficiency of their products

15


Corner stones4
Corner Stones

As much as possible keep one

series in one efficiency grade

16


Corner stones5
Corner Stones

Fan peak total efficiency of a fan series is dependent on fan size

17


Corner stones6
Corner Stones

Defining areas of responsibility for:

Fan manufacturer

Motor manufacturer

HVAC system designer

18



Total or static
Total or Static?

Fan creates pressures:

dynamic (velocity)

and

static

20


Total or static1
Total or Static

Both pressures are also specific energies a unit of flow exerted into the air by a fan

21


Total or static2
Total or Static?

  • Fan is a device to create airflow as its primary function

  • The motion of the air carries

    dynamic (velocity) energy

22


Total or static3
Total or Static?

Fan total pressure is sum of

dynamic (velocity) pressure

and

static pressure

23


Answer
Answer

For fan selection are needed

at least two from the three fan

pressures:

totalandvelocity

staticandvelocity

totalandstatic

24






Fan selection4
Fan Selection

  • Matching the pressure drop across the system against fan static pressure does not give the correct flow, fan size and power

29









Fan energy efficiency
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

37







Fan energy efficiency6
Fan Energy Efficiency

Fan energy (total) efficiency

Fantotalenergy

Energy from motor

43


pTE

44


pTE

45


The characteristic

of the fan energy

transformation

quality is

fanpeak total efficiency

pTE

46


Fan total efficiency

changes along the

fan pressure curve

significantly

pTE

47



pTE

At constant tip speed the fan

pTE of a fan Series changes

with the fan size

49



Pte and fan size1
pTE and Fan Size

As a base fan

size was chosen

impeller size of

1000 mm (40”)

51


Fan size effect
Fan Size Effect

The Size Effect includes effects

  • Reynolds number

  • changes in flow pattern

  • impact of volumetric and mechanical losses

52


Fan size effect1
Fan Size Effect

The Size Effect includes effects

  • deviations from geometrical similarity from size to size

53


Fan size effect2
Fan Size Effect

The character of the Size Effect

changes from one fan Series to

another

54


Design of feg system

Design of FEG System

FEG = Fan Efficiency Grade



Feg system1
FEG System

  • Grade labels in preferred numbers

    e.g. FEG 80, 71, 63 etc.

  • Layer thickness is 6%

57








Attached conditi ons

Attached Conditions

Using these conditions would yield the fastest energy savings




















System effects
System Effects

Restrictions on usage of “system

effects”

83


Result

Result

Defined Areas of Responsibility


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

85


Areas of responsibility1
Areas of Responsibility

Motor manufacturer

Offer motors with highest pEff

and smart units

86


Areas of responsibility2
Areas of Responsibility

HVAC system designer

Optimizes use of the selection

of the fan and the motor incl.

drive package)

87


Areas of responsibility3
Areas of Responsibility

What is missing?

User of HVAC

88





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