EC Fan Technology

Integrated Retrofit Solutionimproving life cycles

SBS ONE

FM SolutionsDynamic Energy ModellingPerformance Gap AnalysisEngineering DesignBuilding Information ModellingEnergy Solution InstallationsMetering & Billing Platforms

Replacing failed or warn out fans and motors, is inevitable in any building. Replacing these either at the time of failure or in advance, with more efficient EC Fan Technology. Offers not only savings, but also addresses embedded problems, such a poor histori-cal performance or access limitations. As well as improving existing fan and system performances.

EC Motor technology with-out carbon brushes, results in

lower Sound Pressure Levels (noise) being emitted, further improving noise levels

and resulting in a quieter environments

Most buildings in the UAE are serviced by AC

and Ventilation sys-tems, of some type or other. To achieve desired conditions for occupancy

These systems with-out excep-tion have a life expec-tancy. Oftenshorter than the b u i l d i n g and its fabric.

Typically in the region of 10-20 years.

In mostcase, these AC and Ven-tilation sys-tems achieve air movement through Alter-

nating Current (AC) motors.

Driving fans and resulting in air

d i s t r i b u t i o n . Either through

supply and exhaust externally or recircu-

lation within.

FCU Fan Lifetypically at max of 45,000 hrs

Systems Over Balancedresulting in energy waste

Excess Fresh Air Volumesresulting in waste & causing drafts

High Background Noise Levelsresulting in poor environments

Limited Access for future replacement

Poor Component Qualitywith shorter life cycles

Accurate System Calculation reducing energy waste

Condensation Build Uppreventing damage to interior finishes

System Under Cooling more noticeable in summer periods

Implementation Timezone Controlreducing equipment operations

Poor Sensor Locationresulting in ineffective control

Implement Setpoint Maintenanceavoiding excess swings / demands

Improvement Areas

Typical Inherent Issues

Alternating Current Motor types are present in most types of Air Condition and Ventila-

tion equipment and plant. From Primary Chillers, to Air

Handling Units, through to ceiling void Fan Coil Units. With typical motor efficiencies of 45% for AC motors, with an operational life of some

45,000 hrs in the case of FCU’s

Retrofitting the FCU’s active compo-nent, the fan, being the larg-est user of electrical energy. From AC to DC/EC Technology. Provides for reductions in electrical consumption for com-parable air volumes, given the efficiencies of Direct Current / Electronically Commutated (DC/EC) motor designs for around 80%

Typical AC motors, suffer from ; Low Efficiency due to copper lossesDecrease in Efficiency as speeds are reducedCarbon Depositing from motor brushesLimiting to motor tappings for speeds

Resulting in equipment operating above initial design requirements, with

excessive use of energy and higher ventilation rates

than required

600200 400 800 1000

Air Flowm3/h

90

20

30

40

50

60

70

80

W

Power Input

010

W

Power Consumption Comparison

ACEC

Volume

40 dB(A)

35 dB(A)

ACEC

Noise Comparison

“direct AC to EC motor technology conversion, can achieve around 40-50% electrical savings alone”

most ventilation fans in UAE,are of AC motor type

At SBS One, we understand not only EC Fan Tech-nology. But how it applies to buildings and systems, here in the UAE in a very practical manner. As well as how an integrated solution, can be implemented into existing buildings, whilst still in occupancy

By using the power of an Energy Dynamic Simulation Model, supported by our suite of control algorithms developed specifically for this technology. We are able to implement an integrated turnkey solution for a single number, or hundreds, of units in any building or space, involving ;

New Fans and EC Motors into existing FCU bodies, providing a new full life cycleNew DDC Controls improving existing

Resulting in ;Significant reductions in energyImproved Controllability and FunctionalityImproved Occupied Environments

Application of not just AC to EC Technology conver-sion, but in an integrated manner. Offers a wider range of benefits applicable to both energy savings and life cycle contributors

Retrofitting FCU’s with EC Motor Technology, is not limited to simply benefiting from the energy savings associated to AC versus EC. But also, as a result of EC stepless controllability, opportunities to further reduce energy consumption open up through;

More Accurate Base Calculation FlowsExact Fan Selection MatchingSetting of Exact Desired Air VolumesVariable Control Methodology

Furthermore, with new DDC con-trols often required to provide

for 0-10v fan speed con-trol. This provides for improved control meth-odologies for the FCU. Including ;

Timezone ControlSetpoint Parameters

Return & Supply SensingSupply Duct Limiting

Accurate DSM calculationsresulting in reduced required flows

Exact Volume Commissioningsetting fans to exact flow rates

Improved Specific Fan Powersfrom 0.8 to 0.15 w/l/s

Greater Fan Efficienciesuse of DC/EC Fan technology

Life Cycle Benefits

Energy Saving Benefits

Adjusted Primary Demandsreducing loads on fresh air plants

Reduced Fan Consumptionfrom stepless controllability

Setpoint Managementvia DDC setpoint deadband

Timezone Controlfrom new DDC programed controls

Double Motor Life Expectancywith EC motors at 90,000 hrs

Duct Leakage Ratesopportunity to measure & address

Condensation Build-Upaddress through supply duct control

Reduced Noise Levelwith lower EC sound pressure levels

CHW Valve Failures & Blockageopportunity to check and address

Longer Plant Life Cyclewith replaced motors and controls

Limited Access avoiding full unit replacement

Improved Environmentwith reduced air volume, less drafts

The use of EC Fan Tech-nology is not limited to secondary Fan Coil Units. But just as simple to apply to

larger fans, in terms of primary Air H a n d l i n g Units. Provid-ing greater volumes.A l t h o u g h , whilst the motor tech-nology is still EC, its application is a plug or centrifugal fan type.

Control Comparison

Roo

m T

empe

ratu

reR

oom

Set

poin

t

Time

ACEC

Power Benefits of Continuous Speed Adjustment

100%

75%

50%

25%

Pe

Power consumption of AC motors

PvPe = Input Power Pv = Air Flow

Power consumption of EC motorsSavings from continuous speed adjustment

75%50% 100%25%

Noise Benefits of Continuous Speed Adjustment

dB(A)

-6

-12

-18

LpA

75%50% 100%25%qvLpA = Sound pressure level

-3

-9

-15

-21

“adoption of EC technology, unlocks further benefits beyond simply motor efficiencies,

through an integrated solution”

implementation can be from single number in a small space, or hundreds across a building

‘Not Just limited to FCU’s’

Power consumption of AC motorsPower consumption of EC motorsSavings from continuous speed adjustment

“an integrated approach to adopting EC Fans,results in excess of 90% electrical savings”

Case Study Mixed Use Tower Located in UAEFacades Facing NE/SEFloor Centres 3750 mmExisting Glazing SHGC 0.32

Shade Coefficient 0.36 Light Transmission 42%

External Glazing 80m 50% of perimeter

Area over 6 demises, total 909 sqmOccupancy 1/10 (75w sensible / 60w latent)Lighting Load 11.84 w/sqmEquipment 16.1 w/sqmServiced by CHW 12no. Fan Coil Units

Provides ability to understand, identify and calculate in full the benefits. Thus avoiding unnecessary capi-tal investment to that would yield poor return

Integrated Reductions

EC Fan Technology in itself, provides significant energy savings through motor efficiencies

Although, with an integrated approach. Including Dynamic Simulation Energy Model (DSM) calcula-tions and utilisation of EC Fan Characteristics Con-trollability, results in far greater returns

These savings are significantly increased, totaling over 90% of electrical consumption, per Fan Coil Unit as a result of ;

DSM Calculation MethodAC to EC ConversionControl Parameters of Fan & SetpointOption of Variable Fan Control

Dynamic Energy Model

room 101, CEO buildingdubai investment park

po box 73629, dubaiunited arab emirates

tel : +971 (0)4 8854249info@sbs.ae.orgwww.sbs.ae.orgimproving life cycles

SBS ONE

30,000

25,000

20,000

5,000

10,000

15,000

As Installed AC Fan Coil Unitwith 30% of units

typically notSwitched Off

35,000

As Installed AC Fan Coil Units

fully time controlled

Energy DSMDesign Calculations

with AC Motor(pre selection)

As Installed Fan Coil Unit

with EC Motor

Energy DSMFan Coil Unit

with EC Motor

Energy DSMFan Coil Unit

with EC Motorand Variable Control

AC to EC Conversion with DSM Energy Model

parametersExclusive of

variability fan control

35%

40%

73%

36% 75%

Over 90%

AnnualConsumptionKWHr

AnnualEnergy Cost AED

Staged Reductions

Yr 1 Yr 2 Yr 3 Yr 4 Yr 5 Yr 6 Yr 7 Yr 8 Yr 9 Yr 10 Yr 11 Yr 12 Yr 13 Yr 14 Yr 15 Yr 16 Yr 17 Yr 18 Yr 19 Yr 20

100,000

200,000

300,000

400,000

500,000

600,000

Energy CostIncreases

5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5%

AED

Life Cycle

20 YrLife Cycle

AED 425,355Saving

20 YrLife Cycle

AED 224,223Saving

ReplacementFCU AC Motors

Like for Like

Area 1AC/EC

ConversionAED 11,700

Area 3 Setpoint @ 23 DegC with D/Band AED 2,078 pa

Area 2Energy DSMCalculationAED 1,200

Area 4EC VariableAlgorithm

Control75%

Base FanPerformance

Areas of Savings

6,984 l/s87.26

51.99

81.32

63.60

Wee

kly

Coo

ling

Dem

and

KW

6,644 l/s

5,196 l/s

4,248 l/s

+22%

+34%

+12%

EnergyDynamic

SimulationModel

HourlyAnalysisProgram

(HAP)

ConventionalDesign

PlantSelection

Peak CoolingProfile

21/7 @ 8:30 NE Facingand

26/8 @ 10:30 SE Facing

Min CoolingProfile

1/1 @ 15:00 NE Facingand

1/1 @ 11:30 SE Facing

Reductions in Calculationand Air Flow

Integrated Solution SavingsEnergy Reductions and Savings, result primarily from electrical reductions in terms of EC to AC Con-version and Reduced DSM and EC Flow rates - (areas 1&2)

Although with new DDC controls and setpoint disci-pline, contributing savings through cooling - (area 3)

With the option of further reductions, of circa 75% electrical in variable FCU control - (area 4)

With only 12no. unit retrofits, ROI’s equate to 2 years and 9 months

With further life cycle savings of post ROI of AED 224,000-425,000 dependant on future electrical energy cost increases

Area 4EC VariableAlgorithm

Control75%

Return OnInvestment