The buildings sector has been recognized, at international level, as one of the most impacting sector concerning the CO2 emissions. With the increasing improvement on building energy efficiency and Net Zero goals, Building Energy Simulations (BES) are becoming the standard. BES is proving to be an effective approach for supporting the design and operation of high-performance buildings, such as zero-energy buildings or zero-emission buildings. The Energy Efficient Buildings course will provide a basic understanding of the building energy simulation process with focus on national and international standards, building technologies and construction techniques. The main goal of the course is that the student will achieve the ability to independently identify and evaluate different energy conservation measures and controls for buildings through systematic analysis and simulation of the building’s energy performance.
Risultati di apprendimento attesi
At the conclusion of the course, the student is aware of the main current topics about the energy performance of buildings and its evaluation; is able to carry out an evaluation of the energy performance of a building and of the comfort conditions for users, using advanced simulation tools.
Detailed learning outcomes:
DD1) Knowledge and understanding
- Understand and apply the current standards for Zero-Energy Building (ZEB) design;
- know passive design solutions and understand the related benefit in different climate zones;
- illustrate the energy performance of buildings and identify the most influential design parameters;
- know the main standards for the evaluation of comfort levels;
- identify the benefits of building energy simulation.
DD2) Applying knowledge and understanding
- Approach climate analysis;
- carry out dynamic building energy simulations;
- analyze and synthesize big amount of data using Excel or other software.
The course will be organized in lectures and in exercises. During the course, the methodology for building modeling and energy simulation will be investigated. Students will be shown the complexity of the energy fluxes in building and the mutual impact of the building envelope parameters (U value, heat capacity, window to wall ratio etc.) on the overall energy balance and thermal comfort. The lectures will be organized in two main parts. The first one focuses on the advance in building technologies and standards with particular attention to:
the current status related to renewable energy and energy efficiency in the construction sector;
the laws, standards and voluntary labels in force for Zero Energy Building design;
the European standard for thermal comfort evaluation (EN 15251, EN 7730);
the significant case studies and prototypes of Nearly Zero Energy Buildings with focus on renovated buildings.
the evaluation and measurement of building component performances (wall, windows etc.)
Different invited lectures will introduce the following topics:
Plant system modeling and simulation;
Daylighting simulation in buildings;
Parametric energy simulations.
The second part focuses on building energy simulation. This includes building modeling and energy simulation of a specific study buildings. The lecture starts with an introduction of Trnsys 18 software (or latest) and Trnsys 3d (free Plugin for SketchUp). Lectures will introduce step-by-step the following issues:
how to implement the building technical characteristic (thermal characteristics of the envelope), schedules of operation, internal gains, etc.);
how to implement the windows shading devices (and its control);
how to implement the ideal plant system for energy consumption analysis;
how to implement the air-to-ground heat exchanger and air-to-air heat recovery.
The basics of building physics are necessary to understand the concept and significance of energy simulation of buildings. A basic knowledge of Microsoft Excel or Matlab is also important for post simulation data analysis.
Modalità di valutazione
The final evaluation is individual. The mark will derive considering the output of the exercise (team’s work presented in a form of detailed report of simulation results) and the individual oral discussion concerning all the topics presented during the lessons (including the invited lectures). The individual contribution to the team’s work will be also evaluated. Students will be requested to deliver an intermediate report during the course. The final mark will be composed as a following:
Team work 40%
Individual contribution during the review 20%
Individual oral discussion 40%
Graziano Salvalai, 2020. Edifici ad energia quasi zero (nZEB), , Editore: Maggioli Editore, Anno edizione: 2015, ISBN: 8891612065
Ljubomir Jankovic, Designing Zero Carbon Buildings Using Dynamic Simulation Methods , Editore: earthscan, Anno edizione: 2012
Karsten Voss, Eike Musall, Net zero energy buildings, Anno edizione: 2013, ISBN: 978-3-920034-80-5
Andreas Athienitis, William O'Brien, Modeling, Design, and Optimization of Net-Zero Energy Buildings, Editore, Editore: Wiley, Anno edizione: 2015, ISBN: 978-3-920034-80-5
Feifer, L., Imperadori, M., Salvalai, G., Brambilla, A., Brunone, F, Active House: Smart Nearly Zero Energy Buildings, Editore: Polimi Springerbriefs, Anno edizione: 2018, ISBN: 978-3-319-90814-4
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Laboratorio Di Progetto
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