ISEP – CIDEM – Pósteres apresentados a eventos científicos
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- Density of aqueous alumina (15nm) nanofluids at different temperaturesPublication . Queirós, Ângela; Coelho, M. Fátima; Iglesias, Teresa P.(Excerpt of introduction) At nanometric scale the materials present properties distinctively different from those in the bulk. The literature has shown that the main factors involved in the behavior of their thermophysical properties are the size, morphology, and content of nanoparticles, the purity of the base fluid and also the possibility of addition of surfactnts. From a fundamental standpoint, it is discussed whether the positive values of p/pw, fig 1, can be considered greater than what would be expected. (...)
- Segurança na decisão clínica baseada no desempenho do monofilamento de Semmes-Weinstein no diagnóstico do pé diabético: Uma análise metrológicaPublication . Castro-Martins, Pedro; Pinto-Coelho, Luis; Marques, Arcelina(Excerto da introdução) A diabetes é uma doença crónica incurável e estima-se que existam em todo o mundo mais de 500 milhões de pessoas com diabetes, sendo declarada pela International Diabetes Federation (IDF, Federação Internacional da Diabetes) como um problema de saúde pública [1]. A Figura 1 traduz de relance os números desta doença.
- Improving ergonomic conditions and productivity – a case study in a PVD coating production areaPublication . Brito, Marlene; Ramos, Ana Luísa; Carneiro, PaulaDue to demographic variation, fewer young workers are available and the overall number of workers will decrease. The length of absenteeism, especially due to musculoskeletal disorders (MSDs), increases with higher age (Müglich et al., 2015). According to Neumann and Dul (2010), if effectively applied in the design of operation systems, Human Factors can improve system performance while reducing health hazards for employees. The aim of this work is to evaluate “How productivity is affected after the implementation of ergonomics improvements?” The case study takes place in a PVD coating production area, where workers’ complaints due to shoulder pains were rising considerably. These complaints come mainly from the processes of loading and unloading pieces from the suspension, before and after the product entering the PVD machine, respectively. This is a repetitive job and involves two awkward postures: flexion of the arms above 60o (from now on “arms up”) about 30% of the time and the difficulty to move manually a full suspension of 6kg, on average, from the machine carpet to a table every 3 minutes and vice-versa depending if it is an unloading or a loading process.
- Using a continuous improvement tool to improve workers' well-being and productivity - A case study in a piglet cutting workstationPublication . Brito, Marlene; Gonçalves, Maria Antónia; Pereira, Maria Teresa Ribeiro; Ramos, Ana Luísa; Carneiro, Paula; Pinto, Vera; Laroca, Ana IsabelNowadays there is an increasing concern for well- being. However, workers continue to suffer from musculoskeletal disorders, which are one of the most widely recognized types of occupational disease. Meat cutters face higher risks of injury and musculoskeletal problems than most other occupational groups due to repetition, force, static posture, work organization, and lack of recovery time. The aim of this paper is to use a continuous improvement audit tool to analyze the current situation of a piglet cutting workstation and then identify measures to improve it, considering productivity and workers’ well-being.
- Experimental study on the impact of using a fan coil in the evaluation of contaminant removal effectiveness of common air diffusion strategiesPublication . Monteiro, Joaquim; Bathelt, Amadeusz; Castro, OlgaThe aim of this study is to investigate the differences in ventilation efficiency owing to an air supply position and air exhaust locations of an air distribution system in combination with a fan coil. Ten strategies of air diffusion strategies were performed in a test chamber applying the tracer gas techniques. All experiments were performed with a presence of the fan coil. For all the ten strategies 9 rph provided by a fan coil was investigated. Three strategies were studied with other renovations rates (6, 7 and 8 rph). For 3 strategies influence of different position of CO2 probes on the final results was checked. The main conclusions of this work are as follows: if the renovation rate is over 7 rph, the contaminants and temperature vertical distributions are destroyed due to mixing of the air; if fan coil provides renovations over 7 rph, the efficiency for every strategy approaches 1; placement of temperature and contaminant probes has an influence on the result of the experiment for particular strategies.
- The study of the impact of demand controlled ventilation in energy consumption of offices in Portuguese commercial buildingsPublication . Almeida, Marco; Monteiro, Joaquim; Castro, OlgaThis study presents an implementation of an application, using mathematical models, which allow to create virtual simulations to minimize energy consumption, thereby enabling an optimization of the energy efficiency of air handling equipment. The mathematical model was validated by laboratory experiments. An analysis of variation of the quantity of supply air of the system for three cities in different climatic conditions was performed. The analysis of energy consumption values for each city, show that the largest potential reduction of energy consumption can be seen to the city of Faro for the simulation of two occupants with a reduction of 39,84%.
- Impact of using solar heat pumps for domestic hot water in Portuguese residential buildingsPublication . Monteiro, Joaquim; Castro, OlgaIn recent years, we have seen an improvement of existing facilities in dwellings in Portugal. Within the heat pumps systems, there is a special type known as direct expansion heat pump assisted by Solar Collector (DX-SAHP). It was calculate the SPF indicator for 30 regions of Portugal. It was analyses the potential of reductions of CO2 and primary energy use for the retrofitting of DHW preparation systems. It was found that the performances of this type of equipment are benefiting from the Portuguese climate conditions, especially in the South and in the Autonomous Regions. Best SPF was obtained for Beja. It was found in all regions of the high potential for reducing CO2 emissions and verifying a potential significant reduction of primary energy consumption.
- Application of the nZEB methodology in the retrofitting of a typical Portuguese dwelling from the 60's.Publication . Monteiro, Joaquim; Castro, OlgaBuildings and the whole built environment are in a key role when societies are mitigating climate change and adapting to its consequences. More than 50% of the existing residential buildings in EU-25 were built before 1970. Thus, these buildings are of significant importance in reducing energy consumption and CO2 emissions. The existence of more nearly zero energy buildings (nZEB) is a possible solution for this problem. This study aims to analyze the application of the nZEB methodology in the retrofitting of a typical Portuguese dwelling build in 1950. It was shown that the primary energy used can be reduced to a very low value (11,95 kWhep/m2.y) in comparison with the reference consumption (69,15 kWhep/m2.y), with the application of the best construction techniques together with the use of energy from on-site renewable sources.
- Impact of design options in zero energy building conception: the case of large buildings in PortugalPublication . Lima, Pedro; Monteiro, Joaquim; Castro, OlgaThe new recast of Directive 2010/31/EU in order to implement the new concept NZEB in new buildings, is to be fully respected by all Member States, and is revealed as important measure to promote the reduction of energy consumption of buildings and encouraging the use of renewable energy. In this study, it was tested the applicability of the nearly zero energy building concept to a big size office building and its impact after a 50-years life cycle span.