31 documents found, page 1 of 4
Assessment of the thermal comfort of a masonry building - numerical study
Carneiro, Ana; Gonçalves, Pedro; Saraiva, Rafael; Oliveira, Daniel V.; Martins, Luís Barreiros; Teixeira, J. Carlos; Rodrigues, NelsonThe need to preserve masonry buildings in earthquake-prone areas leads to the analysis of their behavior when subjected to seismic actions. When studying different strengthening solutions, it is important to reassess the behavior of the building that has been reinforced regarding its initial resistance performance. In parallel, energy studies should be carried out to understand if the reinforcement solution bei...
Development of a numerical optimization model for sizing hydrogen refuelling st...
Ferreira, Ana C. M.; Ferreira, José Paulo; Teixeira, S. F. C. F.; Martins, Luís Barreiros; Teixeira, J. CarlosInterest in hydrogen as a transportation fuel is growing. Fuel cell electric vehicles fed by hydrogen are expected to play a key role in the decarbonization of the transportation sector. Its impact will depend upon the existence of reliable and cost-effective fuelling stations. Numerical simulation allows sizing hydrogen refuelling on-site stations in order to identify the most cost-effective solution for a spe...
Supplier selection and procurement in SMEs: Insights from the literature on key...
Ferreira, Ana C. M.; Silva, A. M.Effective strategic purchasing and supplier selection in companies provides businesses with leverage in acquiring goods and services. Thus, companies are in a better position to negotiate prices, discounts, delivery times and logistic channels. Also, strategic purchasing allows for performing a risk assessment to ensure the company's profitability. This research aimed to identify the key currently deliberated b...
Impact of lean tools on companies during industrial engineering projects implem...
Silva, A. M.; Ferreira, Ana C. M.Lean production is an integrated methodology aiming the elimination of all activities that do not add value to products and services. To get this objective, a set of tools are typically applied regarding waste elimination. Industrial companies from different activity sectors propose the implementation of Lean tools in the development of Industrial Engineering Projects, since the focus is to solve their real pro...
Sawdust drying process in a large-scale pellets facility: an energy and exergy ...
Silva, João; Ferreira, Ana C. M.; Teixeira, S. F. C. F.; Martins, Luís Barreiros; Ferreira, Eduardo; Teixeira, J. CarlosBiomass is an important renewable resource that can be directly used as a raw material in energy converting processes, in wood-based industries, or it can be transformed into other types of biofuels. Its thermochemical properties, such as moisture content and chemical composition, directly influence the lower heating value and, consequently, systems' efficiency. To overcome these problems, drying processes are ...
Numerical study of the unsteady flow in simplified and realistic iliac bifurcat...
Carvalho, Violeta Meneses; Carneiro, Filipa; Ferreira, Ana C. M.; Gama, Vasco; Teixeira, J. Carlos; Teixeira, S. F. C. F.Cardiovascular diseases are a major cause of death and disability worldwide and they are commonly associated with the occurrence of atherosclerotic plaque deposition in the vessel walls, a process denoted as atherosclerosis. This is a chronic and progressive inflammatory disease of large-/medium-sized blood vessels that affects blood flow profiles, with the abdominal aorta and its branches being one of the loca...
A symbiotic relationship between Lean Production and Ergonomics: Insights from ...
Alves, Anabela Carvalho; Ferreira, Ana C. M.; Maia, Laura Costa; Leão, Celina Pinto; Carneiro, P.Lean production is an organisational management model that increases productivity by eliminating wastes (Muda), physical strain or overburden (Muri), and irregularity (Mura) (3M). These last two are related to the way people work, which is frequently harder instead of smarter. LP helps in achieving smart and effective methods of work. This paper aims to illustrate the synergy between LP and ergonomics by the an...
CFD simulation of an alfa-stirling engine to study the geometrical parameters o...
Teixeira, J. Carlos; Oliveira, Ricardo Falcão; Teixeira, S. F. C. F.; Ferreira, Ana C. M.An alpha-Stirling configuration was modelled using a Computational Fluid Dynamic (CFD), using ANSYS® software. A Stirling engine is an externally heated engine which has the advantage of working with several heat sources with high efficiencies. The working gas flows between compression and expansion spaces by alternate crossing of, a low temperature heat exchanger (cooler), a regenerator and a high temperature ...
Parametric analysis of the thermal components of an alpha-stirling engine for c...
Ferreira, Ana C. M.; Teixeira, S. F. C. F.; Teixeira, J. Carlos; Martins, Luís BarreirosStirling engines efficiency, the increased maintenance interval periods, the variety of energy sources and the relatively low gas emissions makes Stirling technology an interesting choice as prime mover for cogeneration applications. These are some of the reasons that justify the attention received from researchers in the last years, focused in its modelling, optimization and its application in the suppression ...
Design of a solar dish Stirling cogeneration system: Application of a multi-obj...
Ferreira, Ana C. M.; Nunes, Manuel L.; Teixeira, J. Carlos; Martins, Luís Barreiros; Teixeira, S. F. C. F.; Nebra, Silvia A.Energy market consumption is expected to increase by 44% from 2006 to 2030, mostly because of the lifestyle standards evolution, and development of industries and economics. In addition, the variations of the fossil fuel prices and the increase in pollutant gas emissions have instigated the research on other types of power generation systems. From the available technologies, Stirling systems have demonstrated s...