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3 results on '"Roberto Saponelli"'

1. Combined numerical approach for the evaluation of the energy efficiency and economic investment of building external insulation technologies

Author

Matteo Venturelli, Roberto Saponelli, Massimo Milani, and Luca Montorsi

Subjects
Energy efficiency, Buildings, insulation, Ventilated façade, CFD, Renewable energy sources, TJ807-830, Agriculture (General), S1-972
Abstract

The objective of this paper is to examine the energy efficiency and economic feasibility of different coating technologies used to improve the thermal insulation of external walls in buildings. The comparison is made between traditional coat insulation and ventilated façade, evaluating their impact on energy consumption to maintain a constant indoor temperature throughout the year by means of a combined numerical approach. . Furthermore, the paper investigates the effect of opening and closing the air gap in ventilated façades on thermal insulation during the winter and summer seasons. Energy efficiency calculations are employed to estimate the economic investment required for implementing the different insulation solutions.The paper proposes an innovative combined approach to determine the performance of the building insulation technologies. Firstly, a computational fluid dynamics (CFD) simulation is carried out on the full three-dimensional geometry of the building during two reference days representing extreme temperature and sun radiation conditions during the summer and winter. This modeling includes the effects of solar radiative heat transfer during the day: for a chosen date, time, and geographical location, the model computes sun altitude and azimuthal angles, along with the corresponding direct and diffuse solar fluxes. In addition, the model uses a multiband thermal radiation approach to capture the different nature of radiative heat exchange according to the light wavelengths. The total heat transfer coefficient of the building walls in each scenario is calculated through the computational fluid dynamic analysis and implemented in an in-house developed library based on the open source Open-Modelica platform to simulate the energy requirement of the building throughout the year. This combined numerical approach provides a comprehensive performance analysis of the studied technologies in terms of electric energy and fuel consumption required for maintaining a constant indoor temperature and internal ambient comfort.The results of the simulations demonstrate that by adopting the two proposed solutions, there was a potential to save approximately 37% of the fuel required for the heating system and more than 51% of electric energy required for the air conditioning systems. Finally, the payback period for each scenario is calculated, and it was found that coat insulation offers the best balance between thermal performance improvement and economic effort, with a payback time close to 20 years.

Published
2023
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2. Numerical analysis of an entire ceramic kiln under actual operating conditions for the energy efficiency improvement

Author

Maurizio Lizzano, Roberto Saponelli, Massimo Milani, Luca Montorsi, and Matteo Stefani

Subjects
Engineering, Ceramics, Environmental Engineering, Hot Temperature, Kiln, 020209 energy, Mechanical engineering, Thermal power station, 02 engineering and technology, 010501 environmental sciences, Management, Monitoring, Policy and Law, 01 natural sciences, Energy efficiency, Heat transfer, Numerical modeling, Transient analysis, Tunnel kiln, Waste Management and Disposal, Natural gas, heat transfer, 0202 electrical engineering, electronic engineering, information engineering, Ceramic, Process engineering, Lumped and distributed parameter model, heat transfer, energy efficiency, emissions, energy efficiency, 0105 earth and related environmental sciences, business.industry, Temperature, emissions, General Medicine, Carbon Dioxide, visual_art, Fuel efficiency, visual_art.visual_art_medium, Combustor, business, Lumped and distributed parameter model, Efficient energy use
Abstract

The paper focuses on the analysis of an industrial ceramic kiln in order to improve the energy efficiency and thus the fuel consumption and the corresponding carbon dioxide emissions. A lumped and distributed parameter model of the entire system is constructed to simulate the performance of the kiln under actual operating conditions. The model is able to predict accurately the temperature distribution along the different modules of the kiln and the operation of the many natural gas burners employed to provide the required thermal power. Furthermore, the temperature of the tiles is also simulated so that the quality of the final product can be addressed by the modelling. Numerical results are validated against experimental measurements carried out on a real ceramic kiln during regular production operations. The developed numerical model demonstrates to be an efficient tool for the investigation of different design solutions for the kiln's components. In addition, a number of control strategies for the system working conditions can be simulated and compared in order to define the best trade off in terms of fuel consumption and product quality. In particular, the paper analyzes the effect of a new burner type characterized by internal heat recovery capability aimed at improving the energy efficiency of the ceramic kiln. The fuel saving and the relating reduction of carbon dioxide emissions resulted in the order of 10% when compared to the standard burner.

Published
2017

3. Ceramic sanitary wares: Prediction of the deformed shape after the production process

Author

S. de Miranda, Francesco Ubertini, M. Ricci, Roberto Saponelli, Luca Patruno, De Miranda, S, Patruno, L., Ricci, M., Saponelli, R., and Ubertini, F.

Subjects
Engineering, Mould prediction, Process (engineering), Mechanical engineering, High temperatures creep, Sanitary ware, Industrial and Manufacturing Engineering, Sintering, Digital manufacturing, Production (economics), Ceramic, Process engineering, Volumetric shrinkage, business.industry, Final product, Metals and Alloys, Trial and error, Ceramic material, Computer Science Applications, Modeling and Simulation, visual_art, New product development, Ceramics and Composites, visual_art.visual_art_medium, business
Abstract

Ceramic materials are nowadays widely used in many industrial applications, ranging from the production of sanitary wares to advanced mechanics. Despite their diffusion, their production process still involves inefficient product development procedures, often based on a trial and error approach. In particular, during drying and firing, the initial shape given by the mould undergoes significant deformations due to plastic strains and volumetric shrinkage. As a consequence, the prediction of the mould shape, needed to obtain a given final product, becomes a problem of primary importance. The first step towards the definition of an effective mould prediction procedure is to accurately simulate the whole industrial process. The aim of the present paper is to build an effective, yet simple, simulation procedure suitable for implementation in the industrial practice. In this article, the adopted modelling strategy is discussed and the results of the numerical model are compared with experimental data highlighting the effectiveness of the proposed approach. The arguments discussed in the paper have been addressed in collaboration with SACMI, a world leading company in the production of machineries for the ceramic industry.

Published
2015

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