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1. The Advantage of Citrus Residues as Feedstock for Biogas Production: A Two-Stage Anaerobic Digestion System.

Author

Guerrero-Martin, Camilo Andrés, Rojas-Sanchez, Angie Natalia, Cruz-Pinzón, David Fernando, Milquez-Sanabria, Harvey Andres, Sotelo-Tobon, David Leonardo, da Cunha, Ana Laura Ribeiro, Salinas-Silva, Raúl, Camacho-Galindo, Stefanny, Costa Gomes, Vando José, and Cunha Malagueta, Diego

Subjects
BIOGAS production, BIOGAS, WASTE recycling, PACKED bed reactors, CITRUS, GREENHOUSE gases, ANIMAL health
Abstract

Anaerobic digestion (AD) is an important step in waste recovery. In Colombia, the production of citrus food significantly contributes to environmental impact via waste generation. In 2021, the waste produced, specifically citrus rind, amounted to 725,035 tons/year. During degradation, wastes generate leachate and greenhouse gases (GHGs), which negatively impact water sources (leachate), soil, and human and animal health. This article describes the design of a two-phase biodigestion system for the degradation of organic matter and biogas production. The system uses citrus waste to produce biogas with neutral emissions. The biodigestion process begins with the stabilization of the methanogenesis reactor (UASB), which takes approximately 19 days. During this period, the biogas produced contains approximately 60% methane by volume. Subsequently, the packed bed reactor operates for 7 days, where hydrolytic and acetogenic bacteria decompose the citrus waste, leading to the production and accumulation of volatile fatty acids. The final step involves combining the two phases for 5 days, resulting in a daily biogas production ranging from 700 to 1100 mL. Of this biogas, 54.90% is methane ( C H 4 ) with a yield of 0.51   L C H 4 g S V − 1 . This study assesses the methane production capacity of citrus waste, with the process benefiting from the pH value of the leachate, enhancing its degradability. Consequently, this approach leads to a notable 27.30% reduction in solids within the digestion system. The two-phase anaerobic biodigestion system described in this article demonstrates a promising method to mitigate the environmental impact of citrus waste while concurrently producing a renewable source of energy. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Techno feasibility analysis of a concentrating solar thermal cooling systems at a university complex

Author

Malagueta, Diego C., Alves, Lucas de Oliveira, Pinto da Rocha, Elisa, Malagueta, Diego C., Alves, Lucas de Oliveira, and Pinto da Rocha, Elisa

Abstract

Concentrating solar thermal (CST) energy applications are growing worldwide, especially in combined cooling, heat, and power processes. Building upon the analysis of a building’s thermal comfort, and software simulations for CST, the current study evaluates a solar conditioning system integrated with absorption systems. The cooling system is equipped with single-, double- and triple-effect configurations cycle, production parameters, and thermal storage. The required fraction of auxiliary energy for the system operation is estimated. The results indicate that the double effect system is the best configuration for the adopted location in Brazil. The system’s annual auxiliary energy demand is, approximately, 20%. Triple-effect systems require less energy at higher temperatures due to local direct radiation, which then leads to an intermittent operation and greater auxiliary energy demands. The methodology applied in this work could be adopted in different locations, with an emphasis on the possibility of testing smaller scale systems in small buildings., Las aplicaciones de la energía solar térmica de concentración (CST) están creciendo en todo el mundo, especialmente en los procesos combinados de refrigeración, calor y electricidad. Partiendo del análisis del confort térmico de un edificio y de simulaciones de software para CST, el presente estudio evalúa un sistema de acondicionamiento solar integrado con sistemas de absorción. El sistema de refrigeración está equipado con configuraciones de ciclo de efecto simple, doble y triple, parámetros de producción y almacenamiento térmico. Se estima la fracción de energía auxiliar necesaria para el funcionamiento del sistema. Los resultados indican que el sistema de doble efecto es la mejor configuración para la ubicación adoptada en Brasil. La demanda anual de energía auxiliar del sistema es, aproximadamente, del 20%. Los sistemas de triple efecto requieren menos energía a temperaturas más altas debido a la radiación directa local, lo que lleva a un funcionamiento intermitente y a una mayor demanda de energía auxiliar. La metodología aplicada en este trabajo podría adoptarse en diferentes lugares, haciendo hincapié en la posibilidad de probar sistemas de menor escala en edificios pequeños.

Published
2021

5. Análisis de viabilidad técnica de un sistema de refrigeración termosolar por concentración en un complejo universitario

Author

de Oliveira Alves, Lucas, Cunha Malagueta, Diego, Pinto da Rocha, Elisa, de Oliveira Alves, Lucas, Cunha Malagueta, Diego, and Pinto da Rocha, Elisa

Abstract

Concentrating solar thermal (CST) energy applications are growing worldwide, especially in combined cooling, heat, and power processes. Building upon the analysis of a building’s thermal comfort, and software simulations for CST, the current study evaluates a solar conditioning system integrated with absorption systems. The cooling system is equipped with single-, double- and triple-effect configurations cycle, production parameters, and thermal storage. The required fraction of auxiliary energy for the system operation is estimated. The results indicate that the double effect system is the best configuration for the adopted location in Brazil. The system’s annual auxiliary energy demand is, approximately, 20%. Triple-effect systems require less energy at higher temperatures due to local direct radiation, which then leads to an intermittent operation and greater auxiliary energy demands. The methodology applied in this work could be adopted in different locations, with an emphasis on the possibility of testing smaller scale systems in small buildings., Las aplicaciones de la energía solar térmica de concentración (CST) están creciendo en todo el mundo, especialmente en los procesos combinados de refrigeración, calor y electricidad. Partiendo del análisis del confort térmico de un edificio y de simulaciones de software para CST, el presente estudio evalúa un sistema de acondicionamiento solar integrado con sistemas de absorción. El sistema de refrigeración está equipado con configuraciones de ciclo de efecto simple, doble y triple, parámetros de producción y almacenamiento térmico. Se estima la fracción de energía auxiliar necesaria para el funcionamiento del sistema. Los resultados indican que el sistema de doble efecto es la mejor configuración para la ubicación adoptada en Brasil. La demanda anual de energía auxiliar del sistema es, aproximadamente, del 20%. Los sistemas de triple efecto requieren menos energía a temperaturas más altas debido a la radiación directa local, lo que lleva a un funcionamiento intermitente y a una mayor demanda de energía auxiliar. La metodología aplicada en este trabajo podría adoptarse en diferentes lugares, haciendo hincapié en la posibilidad de probar sistemas de menor escala en edificios pequeños.

Published
2021

7. Techno feasibility analysis of a concentrating solar thermal cooling systems at a university complex.

Author

de Oliveira Alves, Lucas, Cunha Malagueta, Diego, and Pinto da Rocha, Elisa

Subjects
*COOLING systems, *SOLAR thermal energy, *ELECTRIC power consumption, *SMALL scale system, *HEAT storage, *THERMAL comfort
Abstract

Concentrating solar thermal (CST) energy applications are growing worldwide, especially in combined cooling, heat, and power processes. Building upon the analysis of a building's thermal comfort, and software simulations for CST, the current study evaluates a solar conditioning system integrated with absorption systems. The cooling system is equipped with single-, double- and triple-effect configurations cycle, production parameters, and thermal storage. The required fraction of auxiliary energy for the system operation is estimated. The results indicate that the double effect system is the best configuration for the adopted location in Brazil. The system's annual auxiliary energy demand is, approximately, 20%. Triple-effect systems require less energy at higher temperatures due to local direct radiation, which then leads to an intermittent operation and greater auxiliary energy demands. The methodology applied in this work could be adopted in different locations, with an emphasis on the possibility of testing smaller scale systems in small buildings. [ABSTRACT FROM AUTHOR]

Published
2021
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8. Analysis of technologies and costs for inserting offshore wind power in the brazilian coast

Author

Müller, Matheus do Nascimento, Schaeffer, Roberto, Malagueta, Diego Cunha, Sarzosa, Pablo Esteban Carvajal, Hoffmann, Bettina Susanne, and Szklo, Alexandre Salem

Subjects
Análise de custos e tecnologias, Brasil, ENGENHARIAS [CNPQ], Energia eólica offshore
Abstract

Submitted by Natasha Valladão (natashasilvaa4@gmail.com) on 2021-02-05T00:12:00Z No. of bitstreams: 1 MatheusDoNascimentoMuller-min.pdf: 1178517 bytes, checksum: d300d898815acb80dffcd822d196c66c (MD5) Made available in DSpace on 2021-02-05T00:12:00Z (GMT). No. of bitstreams: 1 MatheusDoNascimentoMuller-min.pdf: 1178517 bytes, checksum: d300d898815acb80dffcd822d196c66c (MD5) Previous issue date: 2019-11 Este trabalho realiza uma análise técnica de tecnologias que compõem um parque eólico offshore, a partir de uma extensa revisão bibliográfica, e parte dessa análise para realizar uma avaliação do custo nivelado de energia para projetos de energia eólica offshore na costa brasileira. Para isso, foram analisados todos os principais componentes de uma planta eólica a ser instalada em alto mar, como por exemplo: turbinas, tipos de subestrutura (incluindo base fixa e flutuante), sistema de ancoramento para turbinas de base flutuante, métodos de instalação, infraestrutura elétrica, operação e manutenção da planta, entre outros. Para avaliar os custos, foi elaborado um projeto de referência de 600 MW, e foi implementada uma metodologia baseada em estudos internacionais de modelagem de custos, que se baseiam em projetos reais implementados na Europa. A metodologia de custos foi aplicada para hotspots de potencial eólico na costa brasileira, selecionados de acordo com estudos anteriores, para os quais foi calculado os custos de capital (Capex) e os custos operacionais (Opex). Para cada local de projeto selecionado, calculou-se a produção de energia anual através de simulações no software RETScreen, obtendo também o fator de capacidade de cada parque eólico projetado. Com os valores de custos e de geração de energia, foi calculado o custo nivelado de energia para cada um dos projetos definidos. This study performs a technical analysis of technologies that make up an offshore wind farm, from an extensive literature review, and goes from that analysis to perform an assessment of the levelized cost of energy for offshore wind energy projects off the Brazilian coast. For this, all the main components of a wind plant to be installed in offshore environment were analyzed, such as: turbines, types of substructure (including fixed and floating base), anchoring system for floating base turbines, installation methods, electrical infrastructure, operation and maintenance of the plant, among others. To assess costs, a 600 MW reference project was developed, and a methodology based on international cost modeling studies, based on actual projects implemented in Europe, was implemented. The cost methodology was applied to wind potential hotspots off the Brazilian coast, selected according to previous studies, for which capital costs (Capex) and operating costs (Opex) were calculated. For each selected project site, annual energy production was calculated through simulations in the RETScreen software, also obtaining the capacity factor of each projected wind farm. With the cost and power generation values, the levelized cost of energy for each of the defined projects was calculated.

Published
2019

9. Medidas ao combate a perdas elétricas não técnicas em áreas com severas restrições à operação de sistemas de distribuição de energia elétrica

Author

Huback, Vanessa Barroso da Silva, Lucena, André Frossard Pereira de, Taranto, Glauco Nery, Malagueta, Diego Cunha, and Schaeffer, Roberto

Subjects
Light, ENGENHARIAS [CNPQ], Perdas não técnicas
Abstract

Submitted by Daniele Fonseca (daniele@ct.ufrj.br) on 2020-06-07T13:06:25Z No. of bitstreams: 1 VanessaBarrosoDaSilvaHuback-min.pdf: 2198362 bytes, checksum: 4abda185beb01a971d1f3424a38fc6aa (MD5) Made available in DSpace on 2020-06-07T13:06:25Z (GMT). No. of bitstreams: 1 VanessaBarrosoDaSilvaHuback-min.pdf: 2198362 bytes, checksum: 4abda185beb01a971d1f3424a38fc6aa (MD5) Previous issue date: 2018-02 Um dos problemas críticos que as distribuidoras de energia elétrica enfrentam são as perdas não técnicas, caracterizadas, principalmente, por fraudes e ligações clandestinas na rede. Parte importante delas ocorre em comunidades, áreas que possuem severas restrições à operação (ASRO). São locais dominados por grupos criminosos, que são responsáveis por limitar a operação e supervisão da empresa, evitando o combate adequado das perdas não técnicas. O trabalho utilizou as experiências internacionais das distribuidoras EPM, Codensa e Electricaribe (Colômbia); Luz del Sur e Enel Perú (Peru); JPS (Jamaica) e Meralco (Filipinas) para propor medidas de redução às perdas não técnicas de distribuidoras brasileiras localizadas em ASRO, além de alternativas para reduzir as perdas econômicas destas. Entre elas estão o reconhecimento regulatório diferenciado para as ASRO, alterações na Tarifa Social, medição pré-paga, medidas sociais, medição eletromecânica nos transformadores, convênio com a Procuradoria e publicação de fotos dos criminosos em veículos de imprensa. One of the most critical problems that the distribution utilities face is nontechnical losses, mainly characterized by fraud and clandestine links in their network. An important part of them occurs in communities, areas that have severe restrictions on the operation (ASRO). These are places dominated by criminal groups, which are responsible for limiting the operation and supervision of the company, avoiding the adequate combat of non-technical losses. The work used the international experiences of distributors EPM, Codensa and Electricaribe (Colombia); Luz del Sur and Enel Peru (Peru); JPS (Jamaica) and Meralco (Philippines) to propose measures to reduce the non-technical losses of Brazilian distributors located in ASRO, as well as alternatives to reduce their economic losses. These include differentiated regulatory recognition for ASROs, changes in the Social Tariff, prepaid metering, social measures, electromechanical measurement in transformers, agreement with the Attorney General’s Office and publication of photos of criminals in press vehicles.

Published
2018

10. Análise do potencial de geração distribuída de energia solar fotovoltaica nos setores bancário, de educação básica e postos de gasolina

Author

Mitidieri, Mauricio Franco, Schaeffer, Roberto, Souza, Reinaldo Castro, Malagueta, Diego, and Lucena, André Frossard Pereira de

Subjects
ENGENHARIAS::ENGENHARIA DE PRODUCAO [CNPQ], Geração distribuída, Planejamento energético, Energia solar fotovoltaica
Abstract

Submitted by Christianne Fontes de Andrade (cfontes@ct.ufrj.br) on 2019-05-22T18:34:11Z No. of bitstreams: 1 876403.pdf: 1870388 bytes, checksum: 8b5a16f7562d77f6481b6c26c2963675 (MD5) Made available in DSpace on 2019-05-22T18:34:11Z (GMT). No. of bitstreams: 1 876403.pdf: 1870388 bytes, checksum: 8b5a16f7562d77f6481b6c26c2963675 (MD5) Previous issue date: 2017-03 A energia solar fotovoltaica tem crescido de forma relevante no mundo, e sua expansão tem se dado tanto em grandes plantas centralizadas como em geração distribuída. Este trabalho buscou, através de uma metodologia que incluiu a amostragem de mais de 1.100 telhados espalhados pelo Brasil, estimar o potencial de geração distribuída no setor comercial e de serviços no país. A escolha dos setores estudados foi direcionada, prioritariamente, pela disponibilidade de dados, que levou à escolha dos três segmentos analisados (educação básica, agencias de banco e postos de gasolina). O processo utilizado incluiu, além da amostragem dos telhados, uma análise quantitativa por setor estudado, levando em consideração diversos aspectos como tecnologias, dados meteorológicos, custos de investimento e operação e o custo do capital envolvido, de forma a quantificar não só o potencial técnico, mas também econômico envolvido nestes casos. Dessa forma, este trabalho constitui uma plataforma de análise para outros setores de serviços posteriormente. Photovoltaic solar energy has been growing significantly in the world, and its expansion has taken place both via large centralized plants and via distributed generation. This work, through a methodology that included the sampling of more than 1,100 rooftops spread across Brazil, estimated the potential of distributed generation in the commercial and services sector in the country. The availability of data drove the choice of the sectors that were studied (basic education, bank agencies and gas stations). Aside from the sampling analysis, a quantitative approach focused on the specific sectors (basic education, banking and gas stations), including aspects related to technologies, meteorological inputs, capital expenditure, operation and maintenance cost and cost of capital, in order to quantify not only the technical potential but also the economic potential involved in these cases. Therefore, this study can be a platform of analysis for other service segments in future research.

Published
2017

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