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Computational Tools for Energy Efficiency: Case of Building Renovation. Venkata Bandi Department of Energy Technology. Outline. Building renovation relevance to energy efficiency Renovation process Focus of this presentation Computational tools Simulation and Calculation - PowerPoint PPT Presentation
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Computational Tools for Energy Efficiency: Case of Building Renovation
Venkata BandiDepartment of Energy Technology
Outline
• Building renovation relevance to energy efficiency• Renovation process
– Focus of this presentation
• Computational tools– Simulation and Calculation
• Compliance analysis• Conclusion
Building Renovation Importance
Source : OTB Research Institute for Housing, Building Renovation and Modernisation in Europe: State of the art review, Delft University of Technology, 2008
Energy Efficiency Potential
Building Renovation Importance
Energy Efficiency in the Context Buildings• Performance Indicators
– vary significantly across disciplines
• Improvements Initiatives– Several alternatives
System Boundaries of the Building
Building Renovation
Source: Yin H. and Menzel, K., Decision Support Model for Building Renovation Strategies,” in International Conference on Building Science and Engineering, 2011.
Initial survey
Energy performance evaluation
Possible solutions
Focus
DecisionProcesses
Source: Yin H. and Menzel, K., Decision Support Model for Building Renovation Strategies,” in International Conference on Building Science and Engineering, 2011.
Feasibility analysis
Existing Approach to Renovation
• Past experiences and common practices– It can go wrong with changing habits resulting from
technological advancements – Buildings are unique
• Location, marker value etc..
Contd..
Computational tools for Decision Support for Buildings
Early Stages of Renovation
• Decision makers– Building owners, Real-estate companies, Urban planners,
Architects
• Alternative to existing practices– Use of computational tools
• Decision-aid for feasibility analysis
Feasibility analysis
• A feasibility study is a technical and economic analysis of potential energy savings– Identifies technical and economical impacts
• Provides reviewers with sufficient information to judge the technical and economic feasibility of the recommended alternatives
Compliance of Computation Tools
• Assumptions– Access to basic geometrical details about the building envelope,
but not extensive details – Basic understanding of technical and economic aspects of
energy efficiency initiatives and indicators – Limited financial resources during conceptual stage of
implementing different energy efficiency measures – Very strong co-relation between input-data size, cost associated
with data collection and effort required for data organization
What are calculation tools?
• Mathematical model– Simple linear equations
• Data analysis– System level aggregation
Example 1
• Additional insulation and energy savings
Compatibility of Computation Tools
• Simulation tools– Demands expertize– Meant for experts
• Calculation tools– Basic skills enough– Suits early decision-making
• Use of calculation tools in early-stage decision-making – Promotes energy efficiency objectives– Increases possibilities of selecting best alternative at early-
stages– Feasibility analysis
Downsides of Calculation Programs
• Our Experience– Finding appropriate supporting tools for early stage decision-
making is a challenging task
– There exists a great deal of variation across different calculation programs and the way impacts are calculated.
Suggestions
Calculation tools, which consider the following parameters, are relatively useful for early stage decision-making.
1. Climatic conditions2. Bundling of energy efficiency measures 3. Economic analysis4. Comparative analysis of different energy
efficiency measures