ec fan retrofit sbs one
TRANSCRIPT
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 [email protected] 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