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BIM-Based multi-objective optimization process for energy and comfort simulation: existing tools analysis and workflow proposal on a case study
No full textDIGITAL MODELS FOR DECISION SUPPORT IN THE FIELD OF ENERGY IMPROVEMENT OF UNIVERSITY BUILDINGS
No full textAccording to the most recent provisions of the European Union, public buildings should play an exemplary role in sustainable development, adopting accelerated renovation rates aimed at improving their energy
performance. Within this category, university buildings are a case study of great interest to experiment with new approaches for energy refurbishment and sustainable management of architectural assets. The research presents a workflow that originates from easily available input data, to reach the definition of a multi-scale spatial database, founded on the synergy between GIS (Geographic Information System) and BIM (Building Information Modeling) and defined according to standard and shared data models. Tools of this kind are crucial for promoting efficient information management building assets, by organizing data into navigable three-dimensional models. In addition to the clear benefits associated with structured archiving, the provision of a relational database makes it possible to capitalize on the already available knowledge and to activate decision support tools for comparative assessment of transformation scenarios. In particular, the use of the cost-optimal methodology is proposed: it is a multi-criteria assessment aimed at identifying a set of optimal energy refurbishment solutions concerning energy consumption and management costs. The paper presents the methodological framework and examines its application at different scales, from the case of the University of Pavia real estate asset to the application to a single building complex
A 3d platform for energy data visualization of building assets
Full text linkWith an exemplary role, the improvement of energy efficiency in public buildings is
in the forefront of the European policies for smart and sustainable growth. However, very often
the sector is characterized by large and old constructions that may also be marked by historical
and cultural value and whose energy consumption is hard to be reduced, due to specific
constraints. In order to operate in this field, the definition of a solid knowledge framework on
the built environment appears to be the only viable starting point. Therefore, the analysis of the
delicate balance between conservation and transformation should be investigated with a multiscalar
approach able to move from the city to the building elements. For this reason, it is
extremely important to provide tools for monitoring and analysing the energy behaviour of the
public building stocks to those actors that are involved in their management. The research here
presented proposes a workflow to implement a web platform based on a three-dimensional GIS
(Geographic Information System) interoperable with BIM (Building Information Modeling) and
able to store, handle and display information on building assets and their energy consumption.
With the aim of defining a repeatable model, the process starts from easily retrievable data on
the built environment and uses standard data models and classification systems. The threedimensional
model is built in a semi-automated way from the combination of the twodimensional
GIS cartography of the municipality and from the point cloud resulting from a
LiDAR (Light Detection And Ranging) national survey campaign. The set of thermal properties
and energy data can be retrieved from the energy performance certificate of the buildings. In
order to test and validate the process, an application on the building stock owned by the
University of Pavia (Italy) is presented. Nine complexes distribute inside the historical centre of
the city and heterogeneously dated from the X to the XX century are considered. After the
definition of the model and its representation inside the web environment, an example of use is
displayed with reference to a comparative energy analysis of different buildings
BIM-Based multi-objective optimization process for energy and comfort simulation: Existing tools analysis and workflow proposal on a case study
No full textIn the last decades, the themes related to comfort simulation have gained a central role in the building process, requiring increasingly thorough analyses. In this field, multidisciplinary simulation-based optimization can be used to help professionals in investigating design alternatives and reaching the best solutions supported by scientific rigor. In addition, due to the complexity of the variables involved, the integration between comfort analysis and BIM-based software is crucial. The research hereby presented starts from a literature review and examines the development of BIM-based optimization with the exploitation of Visual Programming Languages (VPL) in order to achieve an optimization method based on simulation. After the definition the knowledge basis, a workflow that uses the BIM software Archicad in connection with the VPL editor Grasshopper, the environmental plugins Ladybug and Honeybee as simulation tools, and Galapagos and Octopus for the optimization stage is proposed. The framework has been tested on a case study in which thermo-hygrometric and visual comfort have been optimized depending on the size of the glazed surfaces. The study highlights the opportunity arising from the application of BIM-Based multi-objective optimization processes and discusses their limitations at the state of the art
The energy-oriented management of public historic buildings: An integrated approach and methodology applications
Full text linkIn the European framework, there is a strong drive to develop integrated approaches aimed at understanding and improving the energy behavior of public historic buildings within urban contexts. However, the examples already provided tend to address the issue from mono-disciplinary perspectives, losing the opportunity for a coordinated view. The research suggests a methodology to reach the definition of a three-dimensional database, which incorporates spatial models and energy information, with the final goal of merging heterogeneous information that is useful to interpret the overall framework and to design sustainable development scenarios. The platform achieves GIS (Geographic Information System) and BIM (Building Information Modeling) integration by using the CityGML data model, for supporting multi-scale analyses without break of continuity, ranging from urban to building level. The discussion combines the applicative case with the theoretical background, deepening the role of a solid knowledge framework as a basis for sustainable interventions on public historic buildings. To better explain and test the methodology, a case study on the University built heritage of Pavia is presented and three possible outputs deriving from the database are discussed. The example demonstrates the strength of the approach, which is able to provide a variety of results coming from a unique source of information, ensuring coherence and unambiguousness at all levels of investigation
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