Inhaltsverzeichnis
Know-How-Plus - Options and constraints of building renovation towards plus energy building standard
Aim of this research project is to identify the realizable reduction potential of energy consumption and CO2 emissions by refurbishment of the Austrian building stock towards plus energy building standard. Furthermore a construction-oriented manual will be supplied for interdisciplinary planning.
Titel und Synopse
Know-How-Plus - Möglichkeiten und Grenzen von Gebäudesanierungen auf Plusenergiehausstandard
Ziel dieser Grundlagenstudie ist es, das in Österreich realisierbare Einsparpotential an grauer Energie und CO2 durch Gebäudesanierungen auf Plusenergiehausstandard mittels umfassender Lebenszyklusbewertungen aufzuzeigen und einen baukonstruktionsorientierten Leitfaden als Hilfsmittel für die interdisziplinäre Planung bereitzustellen.
Project description / tasks
Status
ongoing
Summary
Starting point / motivation
The paradigm change towards a sustainable development induces a constant improvement of the building energy standards from low-energy buildings via passive houses to plus energy houses. The consequence of these energy-efficient building standards is, that the cumulative energy demand for maintenance and disposal processes becomes more and more important compared to the energy demand for heating. Therefore, the building processes (maintenance, refurbishment, cleaning, dismantling) over the whole life cycle of buildings must be regarded in a holistic way in order to avoid a shifting of the energy and climate protection problems from one life cycle stage to another.
The problem is, that some relevant aspects, like serviceability, closed-loop economy of materials and removability can be evaluated only in a qualitative way. But just these aspects are important for the complex connection of load bearing structure and finishing and completion as well as building equipment due to different service lives of the respective components (Note: load bearing structure over 60 years, finishing and completion 15 to 30 years, building equipment 10 to 15 years).
Therefore a practice-oriented basis is required in form of a construction-oriented manual securing that those aspects are included which are not or insufficiently assessed with the usual computation models (statics, building physics, Energy Performance Certificate,…).
Contents and goals
Life Cycle design of renovation projects should be based on holistic life cycle assessments of the operation and disposal phase of the thermal building envelope depending on the construction type and building age which should be delivered by the objective research project.
Objectives:
- Promotion of high-quality building refurbishments according to plus energy building standard from a holistic point of view by means of a potential analysis of the plus energy house technology related to the Austrian building stock. (Life cycle assessments of about 150 construction details)
- Knowledge of the significant factors influencing the cumulative energy demand and emissions of the use and demolition phase to deduce the optimization potentials in the respective operational fields.
- Increasing the efficiency of energy and resources by using the construction-oriented manual for interdisciplinary system development which means maintenance-, refurbishment- and recycling-optimized constructions.
Methods of treatment
First an overview of refurbishment technologies concerning plus energy building standard (thermal protection measures, energy production systems etc.) is developed and the results are used as basis for the following development of an evaluation raster.
Furthermore an evaluation raster, which covers all aspects from the use up to the disposal phase, is developed and harmonized regarding the basic conditions of the plus house technology. Concerning of this evaluation raster, a qualitative life cycle evaluation of approximate 150 details are accomplished. Based on these results, quantitative input data are derived for the following Life Cycle Assessment - LCA (number of repair cycles, demand for energy and natural resources depending on the connection technique etc.).
Subsequently, life cycle assessments of the details are carried out for the use up to the disposal phase. Beside cumulative energy demand and global warming potential also the volume of waste and resource consumption are determined to show the significant mass flow by refurbishment of buildings. The relevance of significant factors of influence from the respective life cycle phase is pointed out by means of dominance and sensitivity analysis on detail level.
Potential savings in buildings by refurbishment towards plus energy building standard are calculated by linkage of the LCA-results (construction unit level) with the model of the Austrian building stock (data base: "Statistics Austria "- data, WIFO study etc.). Based on this, recommendations regarding climate and energy policy and starting points for interdisciplinary planning are created by means of dominance and sensitivity analysis.
Finally a preparation of the project results is carried out in a simple and an understandable way for broad distribution. A construction-oriented manual is aimed to provide key aspects for interdisciplinary planning in case of refurbishment of building towards plus energy building standard.
Expected results / conclusions
The following results are aimed in the context of the life cycle assessments and potential analysis regarding building renovations building towards plus energy building standard related to Austrian building stock:
- identify the potential savings of energy consumption and CO2 emissions by refurbishment of the Austrian building stock towards plus energy building standard as a function of the construction type and building age,
- show the priorities for Climate and Energy Policy,
- knowledge of significant factors of influence from the use and disposal phase,
- derive starting points for the improvement of the energy and resource efficiency.
Additionally a preparation of the before mentioned project results in a similar way are carried out in form of construction-oriented manual:
- interdisciplinary interfaces and its relevance on climate protection and energy conservation,
- planning requirements for constructions with lowest requirements for maintenance and disposal,
- basis for argumentation regarding high-quality refurbishment of buildings as a function of the construction type and building age.
Project partners
Project management
Graz University of Technology - Institute of Technology and Testing of Building Materials
Project or cooperation partner
- AEE INTEC - Institut for Renewable Technologies
Contact address
Graz University of Technology - Institute of Technology and Testing of
Building Materials
Univ.Prof. Dr. Peter Maydl
Inffeldgasse 24, A-8010 Graz
Tel.: +43 (316) 873 - 7150
E-Mail: Peter.Maydl@TUGraz.at
