1. Lighting
retrofitting:
Improving energy efficiency
and lighting quality
Master Thesis Presentation
Marta Gavioli

2. 1
2
3
4
5
Retrofit:
“work required to
upgrade an aged
or deteriorated
building to meet
new requirement”
Z. Ma et al.:
”Existing building retrofits:
Methodology and state-of-the-
art”

3. 1
2
3
4
5

4. Lighting Electricity
Demand
17200 TWh
48%
28%
16%
08%
19%
lighting
Global electricity
demand
tertiary
residential
Industrial
others
Lighting demand by
sector
Transport
30%
4%
industry;
31%
4%
11%
22%
28%
5%
30%
Building
35%
Global energy demand
by sector
coal
oil
natural gas
electricity
commercial heat
renewables
Energy demand in
the building sector
Total:143 851 TWh
wholesale &
retail 28%
offices
23%
educational
17%
Others
32%
Datas from BPIE survey
Total: 25 000 km2
of useful floor space
non
resident
ial
25%
single
family
houses
48%
apartmen
t blocks
27%
residenti
al
75%
1.1
255
13000
0.1
1
10
100
1000
10000
100000
1800 1900 2000
Kilolumen/hour
percapita
year

5. Reducing electricity
demand growth
Datas from IEA World Energy Outlook 2014
short lives
compared
to building
easy to
access
existing
energy
efficient
technologies
that are not
widely used
Lighting
systems

6. Reducing Energy Demand
•Task-ambient lighting
•Occupancy sensors
•Daylight controls
•Eco-Design
Framework
•En 15193 standard
Regulations Design

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3
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8. Visual
Bio
Mood
Lighting
& Work
awakens
alertness
motivation
Visual
discomf
ort
Uniformity
Glare
Veiling
Reflection
s
Shadows
Flickers
Colour
Eye
strain

9. 300lx
500lx
750lx
300lx
200lx
0.3
0.4
0.5
0.6
0.7
0.8
14 19 24
Uniformity
UGR
Filing, copying, etc.
Writing, typing, reading, data
processing, cad work station,
conference rooms
Technical drawing
Reception desk
Archives
EN 12464-1:
“Lighting of work places – Indoor work places”

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3
2
4
5

11. 1
• Lighting and daylighting audit
2
• Prioritize the possible retrofit works
3
• Identify suitable strategies and technologies options
4
• Implementation
5
• Verify results
Key phases in
lighting retrofit programme
Z. Ma et al.: ”Existing building retrofits: Methodology and state-of-the-art”

12. Retrofit
“work required to
upgrade an aged
or deteriorated
building to meet
new
requirements”
Energy
efficiency
Economical
savings
Lighting
quality
Users’
satisfaction

13. Saving
potentials
Strategies
Approaches
Goal
Energy
savings
Right amount
of light using
less energy as
possible
Efficient light
sources
10-40%
Light only
when it is
needed
Lighting
controls
22-25%
Light only
where it is
needed
Task lighting
20-60%

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4
2
3
5

15. •WHAT? Monitoring the
lighting retrofitting of four
offices in the building of
Electrical Engineering of the
Aalto University
•WHERE? Otakaari 5,
Otaniemi Campus, Espoo,
Finland.
(Latitude: 60.189342, Longitude: 24.831226)
•WHEN? From September
2014 to February 2015

16. Old lighting
system:
4x old ceiling troffer
with 1 T8 fluorescent
lamp
Six offices with
almost the same
configuration

17. Luminaires
performance
Light environment
Users’ satisfaction
Economical savings
Considered Aspects

18. Luminaires
Performance
Labsphere
& 2m
integrating
sphere
CRI
Luminous
flux
Radiant
power and
spectral
distributionCCT
Yokogawa
WT13
digital
power
meter
Current
Power
factor
Power
Voltage

19. Luminaires Performance
New Luminaires:
Surface mnt. LED
luminaires AINO
ALPPILUX
• 35W with Helvar
minisensor3
• 40W no sensors
Old Troffers:
Two types:
2or3 lamp slots
Lamp: PHILIPS TLD
36W/830
Ballasts: helvar L40G
(magnetic)

20. Troffer 3
lamp slots
No
dimming
49W
1831 lm
3027 K
84,92 Ra
37 lm/W
Troffer 2
lamp slots
No
dimming
49W
1983 lm
2986 K
84,74 Ra
41 lm/W
AIL1543F
LED40W/840
No
dimming
40W
2755 lm
4111 K
83,91 Ra
70 lm/W
AIL1543F
LED35W/840
Dimming
35 W
3378 lm
4094 K
83,96 Ra
96 lm/W

21. Light Environment
Before:
Em=180÷350 lx
Uo=0,5
TOO LOW!
In some cases people
were using desktop lamps
Illuminance
was
measured
with LMT
Pocket Lux 2
illuminance
meter
After:
Em=518÷580 lx
Uo=0,8
NOW IT IS OK!
Illuminance

22. Luminance
was measured
with Nikon
Coolpix 8400
calibrated
digital camera
with
Fish-eye lens
and Photolux
software
Light Environment
luminance
Before:
Av. Luminance:
70÷80
After:
Av. Luminance:
120÷130

23. Light Environment
Light intensity & distribution
goniophotometer
Troffer 2 lamp slots
measured with one
lamp:
PHILIPS TLD
36W/830
Troffer 3 lamp slots
measured with one
lamp:
PHILIPS TLD
36W/830

24. Real
reflectance of
surfaces and
measured light
intensities have
been used for
the simulation
Light Environment
Dialux simulation

25. Light Environment
Dialux simulation
Before:
UGR<10
After:
UGR=16÷18

26. Energy and Economical
Savings
Room I433
New luminaire installed:
LED 40W sensorless
After the
retrofit, energy
consumption
in two rooms
have been
monitored
thanks to a
powermeter
Room I434
New luminaire installed:
35W with Helvar minisensor3
No-sensors and with-sensors
situations have been compared

27. Economical
Savings
Hours/ Year the light is on (hr)
Room total power (kW)
Yearly energy cons. (kWh/yr)
Annual running cost (€)
433
8 hours
a day
1 desk
lamp
4 luminaires
49W
1824
0,226
412
82
434
8 hours
a day
2 desk
lamps
4 luminaires
49W
1824
0,256
466
93
Preretrofit consumption
228
Working
days
0,20
€/kWh

28. Hours a day (hr)
Hours/ Year the light is on (hr)
Room total power (kW)
Yearly energy cons. (kWh/yr)
Annual running cost (€)
433
40W
7,25
1653
0,16
264
52
434
35W
5,33
1215
0,14
170
34
Economical
Savings
Postretrofit consumption

29. Economical Savings
0
1
2
3
4
5
6
7
8
1 2 3 4 5 6 7 8 9 10 11 12
Kwh/week
week
weekly energy consumption postretrofit
room433
room434
30
€/year
59
€/year
Annual savings63,5%
less
electri
city
36%
less
electri
city
energy economical
Christmas
holidays
Preretrofit
cons.

30. Users’ satisfaction
0
0.2
0.4
0.6
0.8
1
Pre
Post

31. Lighting energy consumption
Lighting quality in offices
Lighting retrofitting
Case study
Conclusions
1
5
2
3
4

32. Retrofit
=
new
requirements
Economical
savings
Energy
efficiency
Lighting
quality
Users’
satisfaction
Luminaires
performance
Light
environment
✓
✓✓
?