1,720,997 research outputs found
Measured Indoor Environmental Data in a Retrofitted Multiapartment Building to Assess Energy Flexibility and Thermal Safety during Winter Power Outages
Get PDFThe article describes detailed measurements of indoor environmental parameters in a multiapartment housing block located in Milan, Italy, which has recently undergone a deep energy retrofit and is used as a thermal battery during the winter season. Two datasets are provided: one refers to a series of experimental tests conducted by the authors in an unoccupied flat, in which the thermal capacity of the building mass is exploited to act as an energy storage. The dataset reports, with a time step of 10 min, measurements of air temperature, globe temperature and surface temperatures in the analyzed room and data characterizing the adjacent spaces and the outdoor conditions. The second set of data refers to the air temperature monitoring carried out continuously in all the apartments of the apartment block, and hence also during two unplanned heating power outages. The analyzed data show the role of deep renovations in extending the time over which a building can remain in the thermal comfort range after an energy interruption and thus highlight the potential role of retrofitted buildings in delivering energy flexibility services to related stakeholders, such as the occupants, the building manager, the grid operator, and others. Furthermore, the dataset can be used to calibrate an energy simulation model to investigate different demand-side flexibility strategies and evaluate thermal safety under extreme weather events
Valutazione della durabilità per la sostenibilità di edifici esistenti. Durability assessment for sustainability of existing buildings
No full textFocus on soluble salts transport phenomena: the study cases of Leonardo mural paintings at Sala delle Asse (Milan)
Get PDFThe program of investigations on “Sala delle Asse”, which hosts a monochrome landscape attributed to Leonardo, in the Sforza Castle in Milan recently concluded the first step. Results of the analytical tests for the characterization of materials and their damages showed the high diffusion and concentration of nitrates and sulphates on the surface of the monochrome at the edge with the restoration mortars, on the right side of the north-western wall. On the base of the scientific literature and laboratory tests, the researchers identified a threshold of RH above which deliquescence of salts could easily occur. Microclimatic monitoring results informed that during the most humid days in spring, summer and fall, RH trespasses this threshold, with a frequency of about 30 events/year. After an accurate analysis of air temperature (T °C) and relative humidity (RH) resulted that the exterior changes especially affect the interior climate at some summer conditions as middle-high speed of wind and, especially, its direction due to some cracks and holes in the north western exterior wall of the hall
Façade Assessment Procedure for the Evaluation of Durability of Existing Buildings
No full textThe aim of the research is the development and application of a method for the assessment of durability and environmental impacts in the context of sustainable construction with regard to existing buildings.
The method is based on the evaluation of the residual service life which, carried out through non-destructive surveys and laboratory tests, assesses the damage of the buildings envelope and its energy efficiency, correlating the level of degradation to residual performances. This analysis will be followed by maintenance planning and life cycle assessment concerning sustainability.
In the case of historical buildings the analysis, together with specific surveys and documentation, allow to design a preventive preservation plan in order to avoid further damage and risk factors.
The method has a direct experimental application within the project “Città Studi: Sustainable Campus”, which has the aim to transform the university quarter in Milan into an exemplar campus with respect to life quality and environmental sustainability. In particular the paper will report about the recovery-requalification of existing buildings of Politecnico di Milano at Leonardo Campus, which are nowadays under investigation/study through visual inspections, imaging diagnostic, and especially, IR Thermography.
The case study deals with both the issue of repairing and increasing energy efficiency, considering durability and management of buildings, and the cultural issue of preserving masterpieces of the contemporary architecture, since many of the buildings under investigation have the famous architect Giò Ponti as author
Development of a methodological procedure for the durability evaluation of existing exterior finishings
No full textThe aim of the research is the development of a methodology to improve the precision of the degradation survey phase, assessing durability and environmental impacts in the context of sustainable constructions. The method concentrates on the evaluation of the residual service life of external finishing systems correlating the level of damage (carried out through NDT and GIS application), to residual performances. The research of a methodological formulation, to be applied on historical and new (existing) buildings, has the aim to elaborate strategies to increase the service life of the components minimizing the environmental impacts inside the building process. The study promotes maintenance planning or preventive preservation plans, in order to reduce the risk factors.
The procedure has a direct experimental application within the research project “Città Studi: Sustainable Campus”, intended to transform the university area in Milan into an exemplar campus with respect to life quality and environmental sustainability. The paper reports the application of the investigation procedures on some buildings inside Leonardo Campus. On the base of the results, the researchers are performing different lab tests for the evaluation of the adsorption properties and durability of mortars, in view of a validation of the behaviour obtained through software simulation
Evaluation of moisture transfer in external plaster finishing to improve their conservation
No full textEnergy consumption, thermal comfort and load match: study of a monitored nearly Zero Energy Building in Mediterranean climate
Get PDFSeveral definitions of Zero Energy Buildings (ZEB) exist in literature and different implementations of the term can be found in National laws/regulations. The differences among the Member States in nomenclature and definition of the main indicators often lead to incomparable results and difficulties in transfer and diffusion of technologies across the EU. The paper aims to investigate the topic of ZEB by clarifying the meaning of nearly ZEB and Net ZEB through the application of the definitions in a case study of a high-performance building (certified Passivhaus) located in Sicily, Italy. The house fulfils the requirements of nearly ZEB, according to Italian legislation, and satisfies the Net ZEB’s yearly balance between imported and exported energy. However, the use of shorter calculation time periods highlights the presence of a relatively large mismatch between the time of use and of renewable generation. Finally, the results of the thermal comfort analysis show the achievement of adaptive thermal comfort in summer thanks to the passive features of the building (mass, external thermal insulation, solar protections) and passive techniques for heat removal (night ventilation and ground exchange)
The effect of weather datasets on building energy simulation outputs
Get PDFResults of dynamic energy simulations of buildings are affected by many uncertainties, which are the main reason of the performance gap registered between simulated and operational performance. They depend mostly on the incorrect modelling of building components and their properties, the inadequate characterization of operational schedules, the limitations in the simulation algorithms used by energy simulation software, the quality and reliability of data contained in weather files. The first three limiting factors are somehow under the control and capacity of the person in charge of the simulation, that, nevertheless, may not always be able to get detailed building specifications to identify the correct set-points and schedules, or to choose an alternative simulation software. The information contained in weather datasets are, however, completely out of the control of the person in charge of the simulation that may only assume them as a boundary condition. Unfortunately, not all the weather databases show the same level of data accuracy; moreover, they may refer to a climate that substantially changed in the last decades. The effects on building energy simulation results, played by different weather files referred to the city of Milan, is showed and discussed, highlighting the substantial performance difference depending on them
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