Navegando por Assunto "Computational simulation"

Agora exibindo 1 - 2 de 2

Acesso aberto (Open Access)
Simulação do uso de bombas com velocidade variável em processos de saneamento
(Universidade Federal do Pará, 2025-02-07) TRINDADE, Rafael Pinheiro; SENA, Manoel José dos Santos; http://lattes.cnpq.br/2349287816857909
The pursuit of energy efficiency and sustainability in sanitation systems motivated this study, which investigated the use of variable-speed centrifugal pumps (VSCPs) in water supply, sewage systems, and urban drainage processes. The main objective was to develop a computational tool to simulate the behavior of these pumps under different operational conditions, comparing their performance with constant-speed pumps (CSPs). The methodology included mathematical modeling based on hydrodynamic similarity laws and the implementation of a C++ algorithm, validated through comparison with reference data. Twenty one scenarios were analyzed, varying the initial flow rate (Qₘ) from 200 to 800 m³/h and the flow variation amplitude (Aq) from 20 to 60 m³/h, over 24-hour periods. Results demonstrated that VSCPs are significantly more efficient at low flow rates (Qₘ ≤ 400 m³/h), achieving energy savings between 19% and 43%. However, at higher flow rates (Qₘ ≥ 500 m³/h), variable-speed operation became less advantageous, resulting in increased energy consumption (up to 154% in extreme cases). The reduction in power consumption at low-speed regimes, combined with the flexibility to adjust flow rates without throttling losses, justifies the adoption of VSCPs in systems with fluctuating demands. It was concluded that variable-speed technology is feasible for energy optimization in specific contexts, particularly in sanitation applications with moderate demand variations. The developed tool enables the analysis of real-world scenarios, supporting technical decision-making and education in sanitary and environmental engineering.
Acesso aberto (Open Access)
Simulação in silico da produção de biogás em biodigestores em série utilizando o software octave
(Universidade Federal do Pará, 2023-09-04) OLIVEIRA, Gabriellen Kelly Amaral de; RODRIGUES, Antonio Manoel da Cruz; http://lattes.cnpq.br/7524720020580309
The main objective of this study was to address biogas production and explore the use of computational simulation as an analytical tool. The research focuses on evaluating the efficiency of different substrates and operational parameters in biodigester systems for biogas generation, aided by the Octave software, a mathematical programming language, and development environment. The study analyzed biomasses that are widely found in the Amazon biome: cocoa, acai, and coconut, comparing two production approaches: single-phase and multi-phase. The results revealed that the multi-phase system exhibited superior performance. For cocoa biomass, a maximum biogas production of 776.56 mL/gVSad was achieved. In the case of acai residues, a notably higher yield of 834.4 mL/gVSad was observed. As for coconut residues, the production reached 376.9 mL/gVSad. These findings underscore the efficiency of the multi-phase approach compared to the single-phase, highlighting its potential to maximize biogas production. Moreover, the utilization of organic waste as a biogas source contributes to waste reduction and clean energy generation, emerging as a viable and sustainable alternative in the realm of renewable energy production.