Sustainability of
retrofitting measures
of shopping centers –
methodology and
case study results
Johannes Gantner
Fraunhofer Institute for Building Physics
23/06/2016
Shopping Centers as huge energy
consumers
• Large energy consumers due to
their size and their specific
building use
• More and more under focus
• Existing shopping center have a
huge saving potential
=> Assessment of refurbished
shopping center regarding
their sustainability is needed
©Vincent Callebaut “Wooden Orchids”
EU FP7 OPEN HOUSE
Methodology
• »OPEN HOUSE« – and in addition, indicators
from national certification systems (DGNB,
BREEAM, LEED) as a basis and adapted to
refurbishment measures of shopping center.
• Adaption of the sustainability indicators on
product level:
“How does my product influence the
sustainability of the shopping center?”
• Development of the evaluation tool: First on
product level, later on building level
• The application is based on different
examples.
Building level
Product level
Application
Buiding level
Product level
Application
Scenario planning
Indicator Global warming potential
[years]
CRET – Global warming potential of the retrofitting
measure (construction and EOL) [kg CO2-E.]
Epb - Environmental Paybacktime [years]
Obefore – Final energy demand before retrofitting
[kWh/sqm/year]
Oafter – Final energy demand after retrofitting
[kWh/sqm/year]
A - Effective area [sqm]
I – Environmental Impact of the energy source(s)
providing the thermal energy
[kg CO2 E./ kWh]
Years
Evaluation
points
< 2 years
100 points
2 – < 6 years
75 points
6 – < 13 years
50 points
13 – 20 years
25 points
> 20 years
0 points
Case Study
Basic information
Potsdamer Platz
Arkaden
Effective area
Base area
Area exterior walls
thermal transition
coefficient exterior
wall (U-value)
Heating demand
Ventilation demand
Heating source
40.000 m²
15.000 m²
4.000 m²
0,266 W/m²K
143 Wh/m²/year
39 Wh/m²/year
Gas boiler
Retrofitting measure:
Exterior wall insulation
Layer structure before
refurbishment of the
exterior wall
1. Plaster
2. Concrete
3. OSB
4. Insulation panel
5. Plaster (removed)
U-value before:
0,266 W/m²K
Layer structure
λ
after refurbishment [W/mK]
of the exterior wall
1. Plaster
0,9
2. Concrete
0,567
3. OSB
0,13
4. Insultation panel
0,04
5. Mineralwool
0,04
6. Plaster (new)
0,9
U-value after:
0,14 W/m²K
thickness
[mm]
10
300
16
130
120
10
Results exterior wall insulation
 48 out of 100 points for the retrofitting measure
 Weak performance regarding the environmental indicators due to the
small energetic savings
Evaluation Tool for Refurbishment Measures of Shopping Center: Standard
Nr.
14 years
Name Indicator
weighting achieved points
1 GWP
1,70%
25
2 ODP
1,70%
0
3 AP
1,70%
0
4 EP
1,70%
100
5 POCP
1,70%
0
6 Risk from materials
2,50%
90
Total Primary energy demand and share of
7 renewable Primary Energy
4,00%
50
9 Contribution to the depletion of abiotic
resources - non fossil fuels (ADPelement)
2,80%
100
10 Indoor Air Quality
3,00%
100
11 Electro Magnetic Pollution
1,50%
0
12 Material Sourcing
1,00%
0
13 Building related Life Cycle Costs (LCC)
9,60%
0
14 Value Stability
4,80%
37,5
Ease of Deconstruction, Recycling, and
15 Dismantling
4,50%
87,5
16 Building Performance Targets
6,00%
68,75
Construction Site Impact /
17 Construction Process
2,00%
61,66666667
18 Handover and Performance Evaluation
4,00%
75
total % standard indicators out of all
relevant indicators
55,70%
Result
0,425
0
0
1,7
0
2,25
2
2,8
3
0
0
0
1,824
3,96
4,14
1,24
3
26,339
points
48
Summary and Outlook
• First draft version of the CommONEnergy
sustainability assessment for the retrofitting
of shopping center
• Test of the assessment regarding
CommONEnergy retrofitting measures and
technologies still outstanding
THANK YOU!
Presentation to Company name/ Date
Contact
M.Sc. Dipl.- Ing. (FH) Johannes Gantner
Group Sustainable Construction
Department Life Cycle Engineering
Fraunhofer Institute for Building Physics IBP
Wankelstraße 5
70563 Stuttgart
[email protected]
Telephone: +49(0)711-970 3182
Fax: +49(0)711-970-3190
www.ibp.fraunhofer.de