This document discusses the benefits of upgrading to EC fan technology to reduce energy consumption in buildings. It provides case studies showing significant energy and cost savings from replacing existing fans in air handling units, fan coil units, and data center cooling units with high-efficiency EC fans. Specific examples demonstrate annual energy savings ranging from 66-78% with payback periods of less than two years. By modulating fan speed for variable airflow needs, EC fans use much less energy than conventional fans while improving occupant comfort and reducing noise.

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Reduce your buildings energy
consumption Case Studies – EC fan
upgradeHelen McHugh - Head of Sustainable
Technology

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Contents
 Introduction
 Why is it important to consider fans?
 How can EC technology reduce energy
consumption?
 Case Studies
Real examples of upgrades to existing HVAC
equipment
 Air Handling unit – Savings of 66%
 Fan coil unit – Savings of
66%
 Data Centre CRAC units – Savings of 78%

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Introduction
World leading manufacturer of fans & motors
 Leaders in design & manufacture - High efficiency Fans & Motors
 Supplying many markets - key market is HVAC & Refrigeration.
ebm-papst understand the importance of energy efficiency
 Work with building owners & managers to identify opportunities
for energy savings.
 Offer advice, surveys, energy calculations & installation
Replacing inefficient AC fans with high-efficiency EC fans in your
HVAC equipment is a simple way to achieve substantial energy savings

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ebm-papst
EC Fan Technology
Axial Fans Backward Curved
Centrifugal
Forward Curved
Centrifugal

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ebm-papst
Applications involved in the built environment
HVAC -
Commercial
Product: AHU
Fan: Backward Curved
Centrifugal
Product: FCU
Fan: Forward Curved
Centrifugal
Refrigeration
Product: Chiller
Fan: Axial
Product: Cooler /
Evaporator
Fan: Axial
Data Centre Cooling
Product: CRAC Unit
Fan: Backward Curved
Centrifugal
Product: Fan Array – data centre
Fan: Backward Curved
Centrifugal
Source: Airedale, Nuaire, Ability, GEA Searle, Epta Group.,

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Buildings are a major contributor to CO2 emissions in UK
 HVAC accounts for ~40% of a commercial buildings CO2 emissions
 Fans & pumps account for ~ 50% of the energy consumed in HVAC
 Significant energy & CO2 can be saved by upgrading
existing HVAC equipment, fitting energy efficient fans & motors
2 Main reasons to consider fans & motors
1) Government Incentives / Legislation to reduce CO2 emissions
2) Reduce your energy bill - SAVE MONEY!
Reduce your buildings energy consumption
Why should you consider Fans?

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Government Incentives / Legislation
1. Enhanced Capital Allowances (ECAs)
business claim tax relief on investments made
on equipment meeting energy saving criteria. (listed on ETL)
EC fans qualify for ECA’s
4. Ecodesign of Energy related Products Directive – ErP
Imposes minimum energy efficiency levels for products
Minimum efficiency levels set for Motors 2011 & Fans 2013
2. CRC
Encourages organisations to develop Energy Management Strategies
3. CCA’s Climate Change Agreement
Voluntary agreements for industries, if they agree to energy efficiency targets

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Heating
64%Cooling
&
Ventilati
on
6%
Lighting
8%
Other
22%
Hospitality: Typical Hotel
~70% of energy consumed results from
HVAC
“Any money saved on energy goes directly to the bottom line -
a 20% cut in energy costs can represent the same bottom line benefit as a 5% increase in sales”
Reduce your energy bill
Why should you consider Fans?
 Annual energy costs for the sector: In excess £1 billion
 Approx. 100,000 hotels / pubs in the UK
 Upgrading fans - can not only reduce energy bills but also improve customer comfort

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Heating
39%
Cooling
&
Ventilatio
n
8%
Refrigerati
on
16%
Lighting
30%
Other
7%
Retail:
~50% of energy consumed results from
HVAC
Reduce your energy bill
Why should you consider Fans?
 Top 4 supermarkets have over 5,000 stores in UK
 Over 450 shopping centre in UK
 Upgrading the fans can not only reduce energy bills, but also extend life of produce

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Data Centres:
~50% of energy consumed results
from HVAC
Reduce your energy bill
Why should you consider Fans?
Cooling
&
Ventilati
on
54%
Lighting
2%
IT Load
38%
UPS
Losses
6%
 Data Centres are a major user of energy - set to rise
 Consume ~ 2% of the national grid – 1,000MW
 35 - 40,000 facilities in the UK with power >100kW
 Largest data centre in UK ~30MW

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EC Fans
What are they? And why are they more efficient?
Permanent magnet motors with integrated speed
control
 Energy efficiency
More energy efficient than standard induction
motors
 Speed Control
Integrated speed control - no additional VSD is
required.
 Reduced Noise
Reduced noise under speed control
 Compact design
Integrated motor & speed control
 Reduced maintenance
No belts & pulleys
 Built in Power factor correction
AC to DC
conversio
n
Commutatio
n
Electronics
Permanent
magnet
Stator
Rotor

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EC Benefit
Integrated Speed Control allows for fan speed to be
modulated
Energy efficiency
0%
25%
50%
75%
100%
13% 25% 38% 50% 63% 75% 88% 100%
airflow capacity
powerinput
On/Off operation
EC modulation
P1 ~n3
Bar chart shows
Power input V’s number of fans used.
Ie. For a 4 fan system.
- Switching off 2 fans gives
50% reduction in airflow & 50% energy
saving.
Line graph shows
power input for fans controlled via variable
speed.
Ie. For a 4 fan system.
- running all fans @ ½ speed gives
50% reduction in airflow & ~80%
energy saving.

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EC Benefit
Control & Monitoring Options
1) Integrated demand based control of
fan speed means that the fan is only
used when needed
2) Continuous speed adjustment
 reduces noise,
 provides a more even flow of air
 and reduces energy consumption
3) Simply connect a sensor to the motor
for demand control against any
parameter.
4) Larger fans have modbus
5) Bluetooth control is available
The Integrated electronics - allow for simple speed control
 Refrigerant pressure
 Temperature
 Air pressure
 Air volume
 Manual setting
 Any sensor

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Case study
AHU Fan Upgrade at Copenhagen Central Station
Copenhagen train station upgraded their HVAC systems to use EC fans.
AHU’s are located in the basement, supplying the Shopping Centres & Restaurants.
5 AHU’s were upgraded

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Case study
AHU Fan Upgrade Copenhagen Central Station
Original Fan Used
Forward curved belt driven blowers
(AC) Induction motor
Fixed speed
Power Consumption 1,282 kW / week (5
fans)
Replacement Fan (ebm-papst EC)
Backward curved plug fans
PM (EC) motor
Variable speed
Power Consumption 435 kW / week (5 fans)
Source : ebm-papst
Denmark

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Case study
AHU Fan Upgrade Copenhagen Central Station
Source : ebm-papst
Denmark
Savings (annual) Based on 5 fans
Energy Saving % 66%
Energy (Kwh)
44,000
Value (£) £4,400
Carbon (Tonnes) 6.5
Original Fan Used
Forward curved belt driven blowers
(AC) Induction motor
Fixed speed
Power Consumption 1,282 kW / week (5
fans)
Replacement Fan (ebm-papst EC)
Backward curved plug fans
PM (EC) motor
Variable speed
Power Consumption 435 kW / week (5 fans)

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Case study
AHU - London
Original Fan Used
 Forward curved belt drive
blower
 2 x AC motor (1 for
redundancy)
 Fixed speed
 Power Consumption 6.3kW
Replacement Fan (ebm-papst
EC)
 Backward curved plug fan
 PM (EC) motor
 Variable speed
 Power Consumption
1.9kW
 12 AHU’s serve the repository
 Operation. 10 hrs/day. 6
days/wk.

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Case study
AHU - London
 12 AHU’s serve the repository
 Operation. 10 hrs/day. 6
days/wk.
Savings (annual) Per Unit
All 12 Units
Energy Saving % 70%
Energy (Kwh) 13,728
164,736
Value (£) £1,650 £19,768
Carbon (Tonnes) 2.0
24.5
Payback period 2.5 years
* Assumptions
•Units operating 31,200 hrs / year
•Electricity cost £0.12/kWh (incl.
CRC costs)
•kWh to CO2 conversion factor =
0.54522
•CO2 to Carbon conversion factor =
0.2727

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Case study
Office Fan Coil Unit
Office building: 250 FCU’s
2 fans per unit
Induction Motor (AC)
motor efficiency @ Operation point 25 %
Energy consumed per FCU. 137 W
SFP = 0.75
EC Motor (permanent magnet)
motor efficiency @ Operating point 78 %
Energy consumed per FCU. 46 W
SFP = 0.25
66% energy saving
Savings (annual) per unit 250 units
Energy Saving % 66%
Energy (Kwh) 455
113,750
Value (£) £45.50 £11,375
Carbon (Tonnes) 0.068 17.0
Additional benefits
• Lower noise
• Stepless speed control
• Improved occupant
comfort

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Case study
Fan Coil Unit
Old AC twin fan deck New EC double fan unit.
 Same fan dimensions
 Supply as deck for easy installation
 Can include potentiometer, or connect
to BMS
 Includes wiring
 Includes filter to provide high power
factor

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Case Study
CRAC unit - Airedale DF50CW
Original Fans Used
• 2 x Forward Curved Blower Belt drive
• Absorbed Power (1 unit @ 100%) 5.6 kW
Replacement Fan (ebm-papst EC)
● 2 x Backward curved EC plug fans
● Absorbed Power
● (1 CRAC unit @ 100%) 3.4 kW
● (2 CRAC units @ 50% each) 0.84kW
Savings: Operation 24 hours / day, 365 days / year
Savings (annual) 1 unit matched airflow 2 units @
50% each
Energy saving % 39% 85%
Energy (KWh) 19,272 41,698
Value (£) £1,927 £4,170
Carbon (T) 2.9 6.2
Payback Period ~ 21 Months ~19
Months
Source :
Airedale
The room has 2 CRAC units.
1 runs @ 100% & the other is on
standby.
Suggest that both CRAC units run @
50% each.

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Case Study
CRAC unit - Airedale DF50CW
Old fans were removed
Increased the size of the
opening
in the floor
Plug fans installed in the floor
39% energy saving (1 CRAC unit running @
100%)
85% energy saving (2 CRAC units running @
50% each)

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Case Study
Data Centre CRAC Unit - Airedale DF90CW
43% energy saving @ matched
Performance
67% energy saving @ commissioning
Original
Double inlet Blowers removed
New
EC fans fitted above floor in POD
design
Floor Void opened to optimise
airflow

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Case Study
Computer Room Cooling – Diamond Light
Source

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Case Study
Computer Room Cooling – Diamond Light
Source
Phase 1
27 x Stulz downflow units
Upgrade original AC Fans for high efficiency
EC fans.
Aim was 2 fold
1. Reduce energy consumption
2. Reduce noise / vibration

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Case Study
Computer Room Cooling - Diamond Light
Source
Original Fans Used
• 2 x Forward Curved Blower Belt drive
Absorbed Power 2.4 kW
Replacement Fan (ebm-papst EC)
● 2 x Backward curved EC plug fans
● Absorbed Power 1.1 kW
Savings: Operation 24 hours / day, 365 days / year
Savings (annual) Per Unit 27 units (optimised)
Energy saving % 55% 55%
Energy (KWh) 11,738 316,926
Value (£) £1,174 £31,700
Carbon (T) 1.7 46

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Summary
 The easiest way to reduce our carbon emissions is by using more energy efficient
products.
 Government & European legislation is setting higher efficiency levels.
 ErP directive for fan efficiency means that many (AC) Induction motors no longer
comply.
 EC-Technology is an established alternative technology that easily exceeds current
& future efficiency targets.
 EC-Technology can be easily installed as an upgrade to existing equipment.
 EC-Technology offers more energy saving than meets the eye.

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Thank you
Proprietary and confidential information. Any circulation of this document or parts of it in whatsoever form without explicit permission of
ebm-papst is strictly forbidden.
Helen McHugh
Head of Sustainable Technology
Email:
helen.mchugh@uk.ebmpapst.com
Phone: 07802 201891
ebm-papst UK Ltd
Chelmsford Business Park
Chelmsford
Essex
CM2 5EZ