Toolbox to Design Housing Refurbishment, Vladimir Jovanovic

1. Toolbox to Design
Housing Refurbishment
Vladimir Jovanovic, M.Arch.
PhD student at Institute for Architecture and Design
Vienna University of Technology, Austria

2. Outline
1) Introduction
2) Methodology
3) Results
4) Case study
5) Conclusion
Toolbox to design housing refurbishment Vladimir Jovanovic, TU Wien

3. Introduction
Serbia
Houses 70% of population
Consumption 2012 - 35% buildings
app. 220 kWh/m2a (Heating, HWP)
Toolbox to design housing refurbishment Vladimir Jovanovic, TU Wien
Figure 1. Europe and Serbia
Source: National Tourism Organization of Serbia
Europe
80% of buildings by 2050

4. Designing toolbox refurbishment
To assist designers
Early-design-phase
Toolbox to design housing refurbishment Vladimir Jovanovic, TU Wien
Houses
1970’s and 1980’s

5. Goal
 to establish a toolbox for renovation
 to evaluate the effectiveness of
individual retrofit measures
Toolbox to design housing refurbishment Vladimir Jovanovic, TU Wien

6. Methodology
Toolbox to design housing refurbishment Vladimir Jovanovic, TU Wien
Methods: Case study, experimental and simulation
Simulation software: Euro-WAEBED
EE indicator: Heating demands
Location: Serbia, Southeast Europe
Models: Three typical houses
Settings: Upgrading only one component in the basic model

7. Location
Figure 4. Map of Serbia. Analyzed locations are marked
Figure 2. Average annual temperatures in Belgrade
Figure 3. Average annual temperatures in Nis

8. Simulation models
Toolbox to design housing refurbishment Vladimir Jovanovic, TU Wien
Figure 5. Houses from 1970’s and 1980’s in Serbia
Source: Catalogue of typical house designs “Nas stan”

9. The toolbox
Toolbox to design housing refurbishment Vladimir Jovanovic, TU Wien
WALL FLOOR ROOF WINDOWS THERM.
BRIDGES
AIR.
No
insulation
No
basement
Roof ceiling
- no ins.
Single
glazing
Linear
bridges
Window
ventilation
Outdated
insulation
Ground-
floor- no
insulation
Roof ceiling
- insulated
Double
uncoated
Geometric
bridges
Ventilation
with heat
recovery
ETICS
standard
10
Ground-
floor –
insulated
Pitched roof
– no ins.
Upgrade
existing
windows
Repeating
bridges
Non – air
tight
envelope
ETICS
advanced
20
Basement
ceiling – no
insulation
Pitched roof
– insulated
Replace:
2x glazing
Th. bridges
– partly
insulated
Air tight
envelope
Internal
insulation
Basement
ceiling –
insulated
Green roof Replace:
3x glazing
Th.-bridge-
free
Ventil.
facade
External
shutters
Table I. The toolbox for single-measure refurbishment

10. Results I
Toolbox to design housing refurbishment Vladimir Jovanovic, TU Wien
Building feature Retrofit measure Average saving of the
measure
External walls
External insulation 10 cm 33 %
External insulation 20 cm 39 %
Internal insulation 10 cm 30 %
Ventilated facade (ins. 10 cm) 33 %
Floor
Ground-floor ins.10 cm 11 %
Basement-floor ins. 10 cm 1 %
Basement ceiling ins. 10 cm 8 %
Roof
Roof ceiling ins.10 cm 11 %
Roof ceiling ins. 20 cm 13 %
Roof skin ins. (10-14 cm) 7 %
Green roof 5 %
Windows Double glazing (6-12-6 mm, Kr) 11 %
Triple glazing (4-8-4-8-4 mm, Kr) 11 %
Infiltration, air supply Air-tightness (0.5 m2h-1) <1%
Ventilation with HR 95% 15 %
Table II. The effectiveness of single-measure refurbishment

11. Results I
Toolbox to design housing refurbishment Vladimir Jovanovic, TU Wien
Figure 6. The effectiveness of single-measures

12. Case study
Toolbox to design housing refurbishment Vladimir Jovanovic, TU Wien
WALL FLOOR ROOF WINDO
WS
THERM.
BRIDGE
S
AIR
CONTR.
No
insulation
No
basement
Roof
ceiling -
no ins.
Single
glazing
Linear
bridges
Window
vent.
Outdated
insulation
Ground-
floor- no
insulation
Roof
ceiling -
insulated
Double
uncoated
Geometri
c bridges
Vent.
with heat
recovery
ETICS
standard
10
Ground-
floor –
insulated
Pitched
roof – no
ins.
Upgrade
existing
windows
Repeating
bridges
Non – air
tight
envelope
ETICS
advance
d 20
Basement
ceiling –
no
insulation
Pitched
roof –
insulated
Replace:
2x
glazing
Th.
bridges –
partly ins.
Air tight
envelope
Internal
insulation
Basement
ceiling –
insulated
Green
roof
Replace:
3x
glazing
Th.-
bridge-
free
Vent.
facade
Ext.
shutters
Table III. A blank toolbox The toolbox was used:
 to diagnose the initial condition
 to develop two retrofits by choosing set
of measures
Figure 7. Case study

13. Toolbox scenarios
Toolbox to design housing refurbishment Vladimir Jovanovic, TU Wien
Table IV. Diagnosis of initial condition Table V. Building-envelope renovation (R1) Table VI. Comprehensive renovation (R2)

14. Results II
Toolbox to design housing refurbishment Vladimir Jovanovic, TU Wien
Figure 8. Heating demands and saving potential

15. Discussion
Toolbox to design housing refurbishment Vladimir Jovanovic, TU Wien
1) External walls insulation - the most effective measure
2) Roof ceiling insulation, 2nd effective envelope measure
3) HQ double glazing - optimal option for windows

16. Established toolbox and evaluated effectiveness
Provided first-step information and Show-case
Sampling procedure - how to retrofit 70’s, 80’s
(Greater sample – higher generalization)
Recommendation: appropriate SEED assessment
Systematic approach – good ground, pre-step for refurbishment
Conclusion
Toolbox to design housing refurbishment Vladimir Jovanovic, TU Wien

17. References
1) Neuhoff, Karsten, et al. Thermal Efficiency Retrofit of Residential Buildings: The German
Experience. CPI Report, Climate Policy Initiative, 2011.
2) Serbian Energy Agency, Annual Report for the year 2012, Belgrade, 2013.
3) Todorović, M. (2010) First NEEAP/BS national energy efficiency action plan/building sector 2009-
2018. u: Study Report and NEEAP-BS for the Republic of Serbia Ministry of Mining and Energy,
Washington: IRG, June
4) Tsenkova, Sasha. "Country profiles on the housing sector: Serbia and Montenegro." United
Nations Economic Commission for Europe, New York and Geneva (2005).
5) Bojić, Milorad, et al. "Decreasing energy consumption in thermally non-insulated old house via
refurbishment." Energy and Buildings (2012).
6) Sumarac, Dragoslav, et al. "Energy efficiency of residential buildings in Serbia." Thermal Science
14.suppl. (2010): 97-113.
7) Konstantinou, Thaleia, and Ulrich Knaack. "Refurbishment of residential buildings: a design
approach to energy-efficiency upgrades." Procedia Engineering 21 (2011): 666-675.
8) Konstantinou, Thaleia, and Ulrich Knaack. "An approach to integrate energy efficiency upgrade
into refurbishment design process, applied in two case-study buildings in Northern European
climate." Energy and Buildings 59 (2013): 301-309.
9) L. Groat , D. Wang, Architectural research methods, John Wiley and Sons, 2002.
10) Republic Hydro meteorological Service of Serbia, http://www.hidmet.gov.rs/
11) M. Kunath-Rudy, K. Krec: "Thermal Building Simulation for Design Practice" in: "Energy and Mass
Flow in the Life Cycle od Buildings;1996 International Symposium of CIB W67", Eigenverlag,
Wien, 1996, 519 - 525.
12) Jovanovic, V., Stieldorf, K., "Influence of Energy Prices and Income Inequalities on Retrofit
Strategies in Developing Countries: Comparative Analysis of Cost-efficiency of Retrofits on Case
Studies in Belgrade, Nis and Vienna", Proceedings, 8th IEWT conference, Vienna, February 2013.
13) Ipser, C. et. al. (2012): Planungsleitfaden Plusenergie,Teil 3 –Parameterstudien und
Planungsempfehlungen zur Entwurfsoptimierung und Steigerung der Energieeffizienz von
Gebäuden, Berichte aus Energie-und Umweltforschung 56d/2012, Bundesministeriums für
Verkehr, Innovation und Technologie, Wien, 2012.
14) Bointner, R. et. al. (2012): Gebäude maximaler Energieeffizienz mit integrierter erneuerbarer
Energieerschließung, Berichte aus Energie-und Umweltforschung 56a/2012, Bundesministeriums
für Verkehr, Innovation und Technologie, Wien, 2012.
15) MIHAILOVIC Z. “Catalogue of typical house design”. Working group for architectural design “Nas
stan”, Belgrade 1979.
16) EUbuild EE Project: “Sectoral Collaboration Project with Regard to Financing Energy Efficiency in
Buildings within the Frame of EU Regulations and Legal Arrangements, Country report: Serbia”.
http://www.eubuild.com/wp-content/uploads/2011/06/9CountryReport-SERBIA1.pdf
17) Statistical office of RS, http://www.stat.gov.rs (accessed 01.02.13).
18) EUROSTAT, http://ec.europa.eu/eurostat (accessed 01.02.13).
Acknowledgments
The study is a part of the PhD thesis
“Patterns for Energy Efficient Design in Serbia”
financially supported by the
Alfred Toepfer Stiftung F.V.S. Hamburg
Toolbox to design housing refurbishment Vladimir Jovanovic, TU Wien

18. Vladimir Jovanovic, M.Arch.
jovanovic.vlad@yahoo.com
Toolbox to design housing refurbishment
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