segunda-feira, 25 de dezembro de 2017
Projeto e desenvolvimento de um medidor de digital de energia elétrica monofásico para aplicações residenciais
domingo, 1 de outubro de 2017
Biodigesters have been used to convert biomass into biogas and biofertilizers. This energy use has been important for the reduction of solid waste pollution in the environment. This work aims to analyse the viability of the use of pig biofertilizer produced by an Indian biodigester prototype, monitored by a data acquisition system. The biodigester used was an Indian prototype built on a low cost material that is easy to acquire (polyvinyl chloride-PVC). After the biofertilizer production, we tested its efficiency and viability under conditions of vegetation house in the cultivation of sunflower plants. The experimental design was completely randomized in a factorial arrangement with 4 concentrations of biofertilizer (0, 40, 80 and 120 kg N ha-1) × 4 harvest periods (14, 21, 25 and 29 days after sowing). We evaluated biometric and vigor parameters by measurements of stem diameter, height of the aerial part, number of leaves and production of fresh and dry matter of roots, aerial and total parts, as well as the relative chlorophyll content. We performed the experiment with five repetitions using two plants each and we submitted the data to analysis of variance (ANOVA) and polynomial regression using the statistical software Sisvar 5.4. The functional Indian biodigester prototype produced a biofertilizer of excellent quality and viability as a biofertilizer for the initial growth of sunflower plants. The biofertilizer served as a nutritional source in the sunflower crop, since it provided increases in all the growth parameters analyzed in relation to the control group (plants in the absence of biofertilizer), especially in the concentration of 120 kg N ha-1.
The objective of this work is to develop a low-cost data acquisition system, which aims to optimize the anaerobic biodigestion process in an Indian model biodigester prototype, by monitoring the main parameters of the process. In this development, we decided to create a system from scratch, including the entire measure-process-show procedure using hardware tools and free software as means of reducing costs. This platform must be capable of obtaining analog data from the sensors arranged in the biodigester in long periods for the creation of more accurate reports. The system must be able to send this information to a Web server, so these values can be continuously tracked anywhere with access to the internet. The monitoring must be done in a hybrid application for Android, iOS and web browser.
Acquisition System, Biodigestor, Monitoring
quarta-feira, 24 de maio de 2017
domingo, 12 de março de 2017
Autor Principal: Antonio Carlos Barros
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Avaliação Computacional da Influência da Temperatura na Potência de um Painel Fotovoltaico (Computational Evaluation of the Influence of Temperature on the Power of a Photovoltaic Panel)
This work presents the influence of temperature on the efficiency of a solar panel under conditions of constant irradiation. The geometries used in simulation were created in the software ICEM, using the real dimensions of a photovoltaic panel, which were in turn processed in the software ANSYS CFX. The objective of this study is to evaluate the power loss percentage caused by the increase in temperature. The temperature was simulated in the panel interface for two different cases: with and without the presence of air circulation. The results show a gradual reduction of power loss percentage, due to the decrease the temperature of the panel, as the boundary interface cools down. When comparing the power loss percentage of the simulations that showed the highest and the lowest temperature in the panel, it was obtained a 75% reduction of power loss.
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