1. Thermal & Environmental Performance Implications of new vs
Thermal & Environmental Performance Implications of new vs. retrofitted buildings: A case study
Thommy James PADAYHAG, Ulrich PONT, Ardeshir MAHDAVI
Department of Building Physics and Building Ecology, TU Wien, Vienna, Austria

2. Table of Content Introduction Methodology Results & Discussion
Overview & Research Question
Related Work
Methodology
Buildings
Scenarios
Tools & Indicators
Results & Discussion
Conclusion

3. Introduction Overview
Buildings contribute to…. {you all know}
CO2-Emissions / Energy Use – Ambitious goals 2020
Thermal retrofit rate of 3% would be required in Austria
Building Stock versus new buildings
Tightening requirements
Case Study: Houses in Burgenland (Province in Austria)
Country side problems
“Development issues”
Abandoned places
Young families  search for places to life

4. Introduction Research question: Related Work
General comparison between different scenarios (retrofit and new construction)
How does an existing, yet to be adapted and retrofitted building perform in comparison to a complete new one?
Thermal performance ?
Ecological footprint?
Energy efficiency?
Investment cost implications?
Related Work
Korytaorva & Urge-Vorsatz: public buildings in Hungary
Switzerland: replacement of old residential buildings?
Fraunhofer (early!): anyhow – insulation is required…

5. Methodology Buildings: Location: Unterwart, Burgenland
Old building (1950)
119 m² usable area (30 m² gross area)
Partly agricultural use
Traditional construction (bricks, casement windows, non- insulated roof))

6. Methodology
Buildings:
House 1950

7. Methodology
Buildings:
House 2014

8. Methodology
Buildings:
House 1950+

9. Methodology
Scenarios
6 different

10. Methodology
Scenarios
Conventions regarding input information

11. Methodology
Scenarios
Conventions regarding input information

12. Methodology
Scenarios
Key Data

13. Methodology
Tools
Thermal Simulation (Energy Plus)  Heating Demand, Overheating
Normative Procedures (Archiphysik)  Heating Demand
OI3-Method (in Archiphysik) for Eco-Footprint
Sktech-Up for Modelling
Literature (sirados – Cost-Indicator-Books) for Cost

14. Results & Discussion
Results

15. Results & Discussion Results Strengths and weaknesses of all scenarios
S1  lowest overall cost, heating demand & CO2-emissions are highest
S2.1.  (absolute) lowest heating demand, rather low cost
S4  lowest heating demand / m², highest cost, worst OI3- points
S3.2, S2.2. increase heated volume, but not liveable space
 Not recommendable

16. Conclusion Bright and bad sides of different scenarios
Effort of new construction by far largest
Aspect of suitability of chosen scenario for client
“Assumptions”
User behaviour
Good architect / planner required for each scenario
Comprehensive and thoughtful planning required in any case
Decision  not easy to decide (Optimization problem)
Viewpoint of “sustainability”: Reuse of existing structures desirable.

17. !Thank you for your attention!
Thermal & Environmental Performance Implications of new vs. retrofitted buildings: A case study
Thommy James PADAYHAG, Ulrich PONT, Ardeshir MAHDAVI
Department of Building Physics and Building Ecology, TU Wien, Vienna, Austria