Navegando por Assunto "Energy efficiency"

Agora exibindo 1 - 19 de 19

Acesso aberto (Open Access)
Ações de eficiência energética em navios: estudo de caso e um navio patrulha da Marinha do Brasil
(Universidade Federal do Pará, 2016-08-26) AQUINO, Suzane Cruz de; MORAES, Hito Braga de; http://lattes.cnpq.br/5044859479302394; TOSTES, Maria Emília de Lima; http://lattes.cnpq.br/4197618044519148
Due to growing concern about the environment, the IMO (International Maritime Organization), through MARPOL (International Convention for the Prevention of Pollution from Ships), has developed the first mandatory regulation of the area about the energy efficiency of ships aiming the reduction of greenhouse gases emissions and costs related to energy consumption. This dissertation proposes a methodology of energy efficiency measures in a patrol ship of the Navy of Brazil. The analyzed ship, the P-49 or Guarujá, is a 19 years old vessel just as almost all its equipments. The Guarujá is electrically a isolated propulsion system from the power generation, then the target of this research were those systems with the highest electricity demand: the lighting system, cooling, electric power generation, saving and cold storages. However, the information available above those systems have proven scarce, thus it was exploited only the bulbs and some compressors and fan motors. The actions proposed to equipment available verification were 1. the exchange of the reference case bulbs with LED lamps; and 2. replacing the engines with similar specimens of higher yield. They were analyzed financially and environmentally by RETScreen software, an important tool for energy efficiency and renewable sources studies developed by the Government of Canada; with the aid of PROCEL simulator, BD Motor, promoting greater focus on the engines due to its complexity and significance in the optimal functioning of the ship's systems. The actions proved viable, with the total turnaround time of two years, reducing emissions by 164 tCO2 in 20 years and saving about R$ 352,974.80 at the end of the project time, thus justifying their implementation.
Acesso aberto (Open Access)
Análise do desempenho energético de edificações: aplicação analítica do RTQ-C no Edifício do Ceamazon
(Universidade Federal do Pará, 2013-03-27) OLIVEIRA, Bruno Gabriel Freitas; FRANCO, Irving Montanar; TOSTES, Maria Emília de Lima; http://lattes.cnpq.br/4197618044519148; http://lattes.cnpq.br/4254203203850909
One major barrier to economic development is the growing global demand for energy and the consequent increase in the use of natural resources to provide it. Developing countries such as Brazil, showed progressive energy consumption per capita in recent years. Although the majority is from hydroelectric plants (non-polluting sources) its construction causes great environmental impact. Percentage of all energy generated, buildings are responsible for the consumption of approximately 40 % and this percentage is likely to increase by the growth of the construction industry in the country. Regarding the problem, the fight against waste, streamlining and sustainable use of energy consumed by buildings are directly linked to the reduction of environmental impact, delaying the need for increased national energy matrix. In this context is created the Technical Regulation of Quality Level Energy Efficiency Commercial Buildings, and Public Service (RTQ - C). This work consists of a critical application of the RTQ - C using a prescriptive methodology, with the focus aspects of their applicability and evaluation of thermal comfort and luminal, with the premise that the high energy performance of the building is fully achieved only when conditions are guaranteed satisfactory environmental comfort to users. Therefore it was necessary to step thorough data collection and measurements "in situ" of air temperature, radiant temperature, illuminance and relative humidity in two rooms (laboratory of comfort and classroom 2) building the Center of Excellence in Efficiency energy from Amazon - CEAMAZON subsidizing the use of the methodology proposed by Fanger (PMV and PPD), and verification of illuminance levels proposed by NBR 5413. As a result the building showed good performance, but the lack of compliance prerequisites rated with "C" level. A comfort evaluation indicated that approximately 23% of users have had on thermal comfort and the natural ventilation can be used as a strategy to climatic adaptation. Illuminance measurements indicated that only the classroom 2 possessed potential use of natural lighting during the measurement. It was concluded that, despite its importance, the RTQ - C must still pass through a process of adaptation by society and professionals involved in the energy certification of buildings and that during this period changes may be incorporated contributing to make it a effectively valid instrument for ensuring the energy efficiency of buildings in the country.
Acesso aberto (Open Access)
Avaliação através do desempenho térmico de edificação verticalizada em Belém-PA
(Universidade Federal do Pará, 2013-04-01) VINAGRE, Natália Daniele de Lima; PERDIGÃO, Ana Kláudia de Almeida Viana; TOSTES, Maria Emília de Lima; http://lattes.cnpq.br/4197618044519148; http://lattes.cnpq.br/9009878908080486
This dissertation studies the thermal performance of materials in a vertical facade building in the city of Belém - PA, Brazil. This work aims to contribute to the study of the thermal performance and efficiency of materials used in residential buildings of the vertical envelopment, between opaque elements, two types of materials currently very used in construction were selected, painting and ceramic coating. It also studies the influence of the height of the building on its thermal performance and energy efficiency. The study was conducted with the use of computational modeling in EnergyPlus code that evaluates the thermal performance of the building, the influence of the height at the same energy efficiency. Compares the thermal performance of the two selected materials, it was found that the ceramic coating presented building with the average internal temperature of 0.42 ° C above the temperature at the building painted, hence less thermal performance. The influence of the height of the floor did not produce a significant variation in internal temperature, because its increase, small decrease occurred in the internal temperature with thermal gradient of about -0.07 º C / m due to the wind speed is greater when more higher the pavement. It is also considered for this study as passive natural ventilation strategy for the building under study, according to the analysis of Bioclimatic chart Givoni contribute positively to the condition of the internal temperature and humidity, and consequently the user.
Acesso aberto (Open Access)
Balanço energético de um laboratório de pesquisa em cenários pré, durante e pós pandemia, visando certificação NZEB
(Universidade Federal do Pará, 2022-06-27) LAVÔR, Matias Ribeiro Máximo de; LEAL, Adônis Ferreira Raiol; http://lattes.cnpq.br/4099411616990036
Photovoltaic systems have an essential role to improve the energy efficiency of buildings, so that when integrated, it works directly on the energetic balance, with a percentage of load to be compensated by the renewable energy source, important parameter according to latest efficiency requirements. National building labeling is already mandatory for federal buildings, demanding, among other requirements, the compliance of new procedure named Instrução Normativa Inmetro para a Classificação de Eficiência Energética de Edificações Comerciais, de Serviços e Públicas (INI-C), that replaced the old procedure named Regulamento Técnico da Qualidade para o Nível de Eficiência Energética de Edificações Comerciais, de Serviços e Públicas (RTQ-C). The new procedure brings criteria and methods for classifying energy efficiency for commercial, service and public buildings, aiming to obtain labeling buildings. The new instruction also includes the distributed generation in energetic balance of building, as well as the definition of NZEB buildings and carbon dioxide emissions evaluation method. Since 2020, the world has been experienced an exceptional period of the Covid-19 pandemic, and by changing the social dynamics, introduced temporary or permanent transitions in energetic balances and standards of buildings electricity consumption at the whole planet, due to geographic extension of pandemic effects. In this regard, this study seeks to present an analysis of the energetic balance in different chronological scenarios for the building named Centro de Excelência em Eficiência Energética da Amazônia (CEAMAZON), a public institution of Research, Development and Innovation, linked to UFPA, located in the Science Park and Technology of Guamá. Additionally, it shows a short analysis of the new INI-C related to the NZEB and carbon emissions evaluation methodology, considering the new implanted distributed generation system, and the electric vehicle charging station located nearby, highlighting the set of building characteristics that can classify its energy efficiency, and demonstrating essential parameters for certification.
Acesso aberto (Open Access)
Caracterização de um gaseificador do tipo downdraft
(Universidade Federal do Pará, 2010) ALVES, Charles Denys da Luz; NOGUEIRA, Manoel Fernandes Martins; http://lattes.cnpq.br/2324813094737469
The gasification is a thermo-chemical conversion of biomass in fuel gas which can be used as a fuel in internal combustion engines or as a syngas for chemical industry. To quantify the performance of a gasifier we must quantify the energy contained in the gas produced and relate to the amount of energy contained in the biomass that feeds the gasifier, Energy Efficiency, and even with regard to levels of carbon converted from biomass into the gas produced, Carbon Conversion. This paper assesses the energy efficiency and carbon conversion in a prototype of an Indian downdraft gasifier type produced by a local company (Floragás). The gasifier nominal parameters are: gas production capacity of 45 kWt, açaí seeds consumption of 15 kg/h. The gasifier reactor dimensions are ID 150 mm and height in 2000 mm). Its energy efficiency and rate of carbon conversion were quantified, the drop in pressure due to the reactor bed and the gas temperature were also measured at the reactor exit and quantified the concentration of tar, particulate and not condensable gases (CO, CO2, CH4, SO2, N2 and NOx) in the flue gas after cleaning system.
Acesso aberto (Open Access)
Contribuição da geração solar fotovoltaica na certificação de edificações públicas pelo RTQ-C e em edifícios de energia zero: laboratório de ensino da Universidade Federal do Pará
(Universidade Federal do Pará, 2020) SILVA, Hosaías Alves dos Prazeres; TOSTES, Maria Emília de Lima; http://lattes.cnpq.br/4197618044519148
This work presents the contribution of solar photovoltaic generation as a renewable source in the methodology for obtaining Level A Label in Energy Efficiency certification and for the transformation into a Zero Energy Building, being applicable to buildings and public teaching laboratories. The methodology step-by-step essentially consists of two stages: the first, through an energetic diagnosis of the building analyzed, following the guidelines established in the Technical Regulation on Quality in Commercial, Service and Public Buildings - RTQ-C (in portuguese), resulting in a proposal of energetic, financial and environmental improvement processed with the aid of the RETScreen® software; and the second, dimensioning a photovoltaic solar generation system, based on local measurement data and the Meteonorm® software, as a bonus for obtaining the Level A Label of the RTQ-C levels and with energy production capacity that makes the energetic balance of the building as positive, making it a Zero Energy Building. In order to contextualize the relevance of the work and update the reader in the state of the art applicable to the methodology, a bibliographic review is presented, directed to the benefits of Energy Efficiency in public buildings and to the RTQ-C; to the current scenario, application and contribution of Solar Photovoltaic Energy in sustainable development, in obtaining nationally and internationally recognized classifications for public buildings; and the concepts currently used by the academic community to characterize Zero Energy Buildings. The bibliographic review and methodology were applied in a case study of the Laboratory of Electrical and Computer Engineering – LEEC (in portuguese), located at the Campus Guamá of the Federal University of Pará, with presentation of the energetic, financial and environmental results, showing that it is a solution to be applied in public institutions and buildings that have available space and similar infrastructure to that of the LEEC.
Acesso aberto (Open Access)
Desempenho termoenergético da utilização de telhado vegetal em edificação no clima amazônico
(Universidade Federal do Pará, 2013-03-19) MARINHO, Dircirene Tavares; FRANCO, Irving Montanar; http://lattes.cnpq.br/4254203203850909; TOSTES, Maria Emília de Lima; http://lattes.cnpq.br/4197618044519148
The thermoenergetic performance of all construction work stems from the decisionmaking of the initial phase, and the thermo-physical characteristics of the materials used must be considered. The thermo-physical phenomenon of inertia in the roof vegetable offers resistance to the transport of thermic charge to inside the edification, reducing the demand of the electric energy needed to its climatic conditioning. At the same time, the low albedo of the roof vegetable contributes to mitigate the effects of the heat islands in urban environments. The bioclimatic and microclimatic study needed will determine the choice of the suitable construction materials, especially regarding the protection of surfaces exposed to solar heat load. This work deals with the experimental verification of the thermoenergetic performance of a room covered with grass in a place where the vegetation is predominant, in the Guamá Science and Technology Park, Federal University of Pará Campus. The key objective was to examine the thermal response of the slab by proving mitigation of heat spikes by physical phenomenon of thermal inertia, implying favorable results of energy performance by reducing the use of active cooling. It was performed preliminary characterization of the indoor and outdoor microclimate through the obtained values of temperature and relative humidity of air, and observed the evolution of internal environmental conditions in two phases, with the slab discovered and after application of vegetation. The quantitative results showed favorable performance of the roof vegetation in the moderation of heat flow through the slab, contributing to the reduction of the temperature of indoor air and consequent energy efficiency in buildings in Amazonian climate.
Acesso aberto (Open Access)
Desenvolvimento de modelo de sistema de informações geográficas para avaliação da eficiência hidroenergética em sistemas de abastecimento de água
(Universidade Federal do Pará, 2015-10-29) SANTOS, Aline Christian Pimentel Almeida; PEREIRA, José Almir Rodrigues; http://lattes.cnpq.br/9918600634569244
Development of methodology for evaluating the performance of hydro-energy Water Supply Systems (WSS) using System Model of Geographical Information (GIS) to assist in decision-making in the SAAs operation. The model developed in GIS platform enables registration, systematization and the spatial distribution of hydro data in order to avoid excessive spending on electricity aggregate the volume of water available for consumption. In Stage 1 the hydro-energy parameters were identified WSSs used in current management methods and then set the data and indicators for the spatial representation in the model of the hydro-energy performance by sector and water supply unit. In the 2nd stage was developed the management model in GIS through Delphi IDE XE5 and TatukGIS platform in three phases: geographic database construction (Phase 1); Construction of GIS module (Phase 2) and construction of hydro-energy module (Phase 3). The last step (Step 3) was submitted to evaluation of the model developed functionality, which simulated the operation of the WSS Bolonha, the Metropolitan Region of Belém, Pará, Brazil, which allowed the spatial data and indicators to identify the sectors with best and hydro-energy worst performance. The color grading maps building tool was efficient, allowing quick identification of the best result of the electricity consumption index in sector 9 of the Central Zone (0.62 KWh / m³) and the worst index total loss in sector 7 of the Central Zone (54.29%). In addition to the warning signs for tool for the indicators above the target set by the user, which enabled the identification of sector 7 with the worst energy consumption index (0.85 KWh / m³). With the work it was found that the SIGHE2A model is a tool that enables and streamlines the evaluation of the hydro-Energy performance WSS, especially to facilitate problem identification and decision making.
Acesso aberto (Open Access)
Desenvolvimento e aplicação de metodologia para avaliação de desempenho hidroenergético de sistemas de abastecimento de água
(Universidade Federal do Pará, 2016-02-19) REGO, Augusto da Gama; PEREIRA, José Almir Rodrigues; http://lattes.cnpq.br/9918600634569244
This doctoral thesis aims developing a methodology and implementing it on software in order to evaluate a water supply system (WSS) hydro-energetic performance, as well as applying it on a real scale WSS. This paper was carried out in two stages: 1) modeling the hydro-energetic performance evaluation process, establishing of formulations to calculate hydro-energetic losses and implementing methodology on software; 2) applying the methodology at a real scale WSS, which required monitoring of hydraulic and electrical quantities and simulating this WSS at Epanet 2.0. The first stage results consisted at defined hydro-energetic losses and conceptualize hydro-energetic performance on the proposed methodology, which consists sequences of actions and mathematical formulation to calculate hydro-energetic losses at the WSS, as well as to evaluate WSS hydro-energetic performance and, finally, at methodology implementation in a software using Visual Basic for Applications (named as SADHE2A) and successfully tested at the WSS with synthetic data. The second stage results are related to methodology application at WSS of Guanabara (located at Ananindeua city, Pará, Brazil), using SADHE2A – versão Beta, in which were identified water global losses of 55.42% and electrical energy global losses of 8.31% (both classified as “bad” by the methodology), resulting in an economical deficit of 17,981.77 R$/month. This value is equivalent to 57.61% of electrical energy costs, since raw water pumping to the final water costumer. Finally, the methodology developed has met the research expectations to calculate the water losses and electricity consumed losses and to evaluate the hydro-energetic performance of the WSS in Brazil and world.
Acesso aberto (Open Access)
Desenvolvimento e implantação de um sistema para monitoração do desempenho energético de edificações
(Universidade Federal do Pará, 2012-10-11) MANITO, Alex Renan Arrifano; PINHO, João Tavares; http://lattes.cnpq.br/0847897516772421
This work presents the strategies and standards adopted, as well as the operating modules, of the monitoring system developed and which is currently being implemented in the building of the Grupo de Estudos e Desenvolvimento de Alternativas Energéticas (GEDAE), called the Laboratory of Renewable Energy and Energy Efficiency, aiming to monitor mainly climatic parameters and those related to the electricity generation and the consumption of the building. The system’s goal is the creation of a unified and synchronized database, of easy access to the users of the building, as well as the development of customizable tools for the acquired data analysis with the possibility of being expanded to accept new variables of interest, facilitating studies concerning the performance of the building when it comes to its energy consumption, energy generation systems and environmental comfort conditions, and also enabling the evaluation of the strategies adopted in the building. It is expected that the data collected can be used as a way of disseminating strategies for energy efficiency in buildings as well, through the publishing of some of the results on the internet in a dynamic page for that purpose.
Acesso aberto (Open Access)
Eficiência energética em redes sustentáveis: uma avaliação baseada em redes small cells e backhaul
(Universidade Federal do Pará, 2015-03-13) LOPES, Albert Richard Moraes; COSTA, João Crisóstomo Weyl Albuquerque; http://lattes.cnpq.br/0255430734381362
The use of small cells in heterogeneous networks (either 3G, 4G and 5G future) for indoor traffic has been regarded as the best solution to meet the growth of mobile traffic due to reduce network power consumption and to guarantee the high capacities. Moreover, increasing the amount of small cell deployment implies in the expansion of the backhaul network, which causes an increase on the network power consumption, and threatens the small cells gains in terms of energy. Furthermore, the energy consumption in heterogeneous network can increase considerably depending on the choice of the type backhauling. Considering this background, this work aims to provide a methodology to assess and identify possible energy consumption bottlenecks in the mobile network, considering both the wireless part as the backhaul infrastructure. The methodology considers the demand of traffic generated in the city, scenario to implementation and operation of heterogeneous networks (small cells), and dimensioning backhaul by segment (Cell Site, Hub Site e Central Office). Adopting this methodology, the study evaluates and compares three types of backhaul architecture for conventional Femtocell or Femtocell Wireless over Cable (FemtoWoC) network: Fiber-to-the-Building, Fiber-to-the-Curb e Fiber-to-the-Home. It was found that the main bottleneck in the backhaul architecture is the segment that is responsible for aggregating traffic from small cells (Cell Site). However, adopt architectures and equipment with high energy efficiency, as FemtoWoC, in the segment bottleneck reduce significantly the total power consumption in the backhaul, mainly architectures based on copper in the last mile.
Acesso aberto (Open Access)
Impactos de cargas motrizes na qualidade de energia e eficiência energética em uma nanorrede de distribuição em corrente contínua
(Universidade Federal do Pará, 2024-03-22) ALVES, Victor Parente de Oliveira; GALHARDO, Marcos André Barros; http://lattes.cnpq.br/6672470707462259
This work presents an experimental study involving the impacts of rotative loads on electrical energy quality and energy efficiency in a Direct Current Distribution Nanogrid (DCDN) idealized and implemented by the Grupo de Estudos e Desenvolvimento de Alternativas Energéticas (GEDAE) in Ilha das Onças, a community on the banks of the Piramanha River, Barcarena-Pará. Therefore, two types of rotative loads were selected for this work: DC motor pumps, directly connected to the DCDN, and AC models, supplied through inverters; and refrigeration equipment: refrigerator and freezer, both with the same compressor model and operating on direct current. The work presents the technical characteristics of the DCDN, as well as the instrumentation used for measurement and data acquisition involving electrical parameters of the grid and monitored loads. The energy quality events addressed relate especially to the presence of ripples with the injection of AC current along the DCDN in the steady-state operation regime of the rotative loads and inrush current during the activation of the motor pumps. Regarding short-duration events, focus is given to voltage sag during the activation of refrigeration, as there is a peak of demand of high magnitude, reaching more than 28 times the effective nominal current, or rms value, for one of the loads. Concerning energy efficiency, a comparative study is conducted involving the current operational scenario of the nanogrid with the use of mixed DC and AC loads and other technically feasible but not implemented scenarios, in order to highlight the benefits of the current configuration for energy supply to families in the area. Finally, cost avoidance estimates and emission reductions are also addressed, considering the use of gasoline motor pumps before the implementation of the DCDN, through the presentation of data and information obtained from one of the households presented in the work.
Acesso aberto (Open Access)
Laboratório remoto para ensino de eficiência energética em um sistema de bombeamento de água
(Universidade Federal do Pará, 2009-09-11) LOUREIRO, Igor Bittencourt; TOSTES, Maria Emília de Lima; http://lattes.cnpq.br/4197618044519148
The rational use of electric energy is a subject much discussed at present. A major concern is with the Brazilian industrial sector, which is responsible for most of the consumption of such energy, due to the use of motor systems. Allied to this fact, the lack of an appropriate approach to teaching energy efficiency and energy conservation in many Engineering courses in Brazilian universities, contributes to the increase in electricity waste. In this sense, this work presents a remote laboratory aimed at testing the energy efficiency in a system driving water pumping. For this, we developed a software to monitor and trigger the prototype water pumping LAMOTRIZ belonging to the Federal University of Pará. Still, we designed a pilot trial to test the remote experimentation with undergraduate and postgraduate students of that University and conducted an evaluation of this trial by those students.
Acesso aberto (Open Access)
Uma metodologia para enquadramento tarifário eficiente, por meio de análise da demanda e do consumo de energia elétrica: um estudo de caso nas unidades da Universidade Federal do Sul e Sudeste do Pará
(Universidade Federal do Pará, 2017-01-25) SILVA, Dhonny Lima da; FRANCÊS, Carlos Renato Lisboa; http://lattes.cnpq.br/7458287841862567
In the current world context of technological advances in which society becomes increasingly dependent on electric power, an interesting fact draws attention, the waste of electric power in the institutions that generate technical and scientific knowledge, Federal Universities, a proven fact by the concern and initiative of the National Electric Energy Agency published in October 2016 through the call 01/2016 the electric power distribution concessionaires, which aim among other objectives to invest in energy efficiency and minigeration in the Federal Universities, which shows the absence of strategic energy management, lack of a culture of energy resources optimization and of public resources, and the disengagement with the sustainable use of electric power and, as a consequence, of natural resources by most Federal Universities. Thus, this work may help in the search for the minimization of waste of electric power and public resources in the Federal Universities, as it will propose an efficient methodology of tariff framework, capable of evaluating and adjusting the contracted demand (kW) and the consumption tariff modality of electricity from groups A4 and B3 to current regulations. The methodology consists of achieving energy efficiency, through the demand, tariff framework and the consumption of electric power analysis in the consumer units of the IFES, in particular the case study of the units of the Federal University of the South and Southeast of Pará, through the study of the monthly electric bills and the resolutions and norms on the types of electricity tariffs of groups A4 and B3, applied by National Electric Energy Agency, also respecting the case study that will take place in the concession area of the Electric Centrals of Pará. The methodology will also make the fine forecast of contracted demand (kW), so that one can contract the demand that is actually needed, avoiding wastes. As such, it is expected to adjust the contracted load demand (kW) of each consumer unit of the A4 group to be studied, its real necessity, avoiding unnecessary costs with contracted demand payments above or below the consumed demand, it is also aimed to adapt the tariff structure of each observed consumer unit, both in the A4 and B3 groups, according to its load demand and its electric power consumption and, finally, the cost reduction for Public Administration is sought and provide a practical way of analyzing and indicating the best tariff framework of the groups studied, and by such, achieving sustainable consumption and efficient electricity contracts.
Acesso aberto (Open Access)
Modelo para tomada de decisão em programas de eficiência energética no setor de distribuição de eletricidade
(Universidade Federal do Pará, 2018-04-27) SILVA, Rogério Diogne de Souza e; TOSTES, Maria Emília de Lima; http://lattes.cnpq.br/4197618044519148
The electricity distribution system is constantly evolving, with the dissemination of distributed energy resources, smart grids and the inclusion of competitive markets, in which the use of energy efficiency as a relevant resource for sector planning must be ensured through public policy. Brazil has for decades had a program and policy in this area, however, the results of its program for the insertion of energy efficiency actions with the financial resources of the electricity utilities, have less impact than similar programs in other countries, and there is the imminent need to meet the emission reduction targets proposed by the country at the 21st Conference of the Parties of the United Nations in December 2015 in Paris. In this context, the present thesis proposes the development of a non-parametric model for the determination of performance indicators and classification of energy efficiency projects. It also contributes to the evaluation of the Energy Efficiency Program, through a methodology to analyze the projects, classify and quantify the variables, resulting in recommendations for the improvement of the program. A database of projects submitted to ANEEL by the utilities of the electricity distribution sector from 2008 to 2016 was used. The model was developed using Data Envelopment Analysis (DEA), a non-parametric method that uses linear programming to calculate the most efficient units in a given set of decision-making units. The results show that the best performance was achieved by projects in the industrial and cogeneration categories, however, these constitute only 4.24 % of the projects presented and 5.28 % of the total investments in the last eight years, indicating the need to review energy efficiency regulatory strategies. As a solution to improve the selection of the best performing projects, it is suggested assigning weights to the categories to optimize the project results, by incentives to the projects with the best performance, without excluding the participation of all others, simply by providing energy savings goals and demand reduction at peak hours compatible with the best performing categories.
Acesso aberto (Open Access)
Predição de bombas funcionando como turbinas em toda a faixa de operação: estudo de caso de uma rede de distribuição de água
(Universidade Federal do Pará, 2021-06-18) GAIA, Juliana Garcia; MESQUITA, André Luiz Amarante; http://lattes.cnpq.br/1331279630816662
Nowadays, the importance of reducing energy costs and/or obtaining alternative forms of generation has increased more and more. In this context, pumps working as turbines (BFT) emerge as a sustainable alternative for energy generation taking advantage of the hydraulic potential of a location. However, the adversity found is related to the BFT operating range in turbine mode. This work aims to theoretically determine the operating range of pumps working as turbines of pumps selected to work as pressure reducing valves (PRV) in the water supply system (SAA) of Vila Permanente, in Tucuruí. Three experimental studies were evaluated and the methods of Sharma & Williams (1995), Yang et al. (2012) and Alatorre-Frenk (1994) to achieve the PATs head (Ht) and flow (Qt) prediction results in turbine mode at the best efficiency point (BEP); after that, the method developed by Rossi (2019) was applied, which works outside the entire operating range of the BFT, combined with the methods in the BEP to obtain the characteristic curves Q x H (flow x head) and Q x η ( flow x efficiency) of the BFT in turbine mode; and finally, the results obtained through the methods were compared with the results of experimental studies, so that the best combination of methods was selected. Then, with the height and flow values of the pressure points in the SAA of Vila Permanente, centrifugal pumps were selected to work as turbines, applying the best combination of method and then obtaining the characteristic curves Q x H (flow x head) and Q x η (flow x efficiency) of the BFT in turbine mode, in order to reveal various points where the BFT can operate; in addition to energy recovery calculations with values in KW per day, month and year. In water supply systems, energy costs are excessive and it is common to use pressure reducing valves at points where this reduction is necessary to ensure the right circumstances for the transport of water in the pipeline. In this way, it is understood that there is a waste of energy that could be used in the system itself.
Acesso aberto (Open Access)
Sistema de gerenciamento de energia como ferramenta de eficiência energética na indústria
(Universidade Federal do Pará, 2015-02-24) SOARES, Gerdson Tanaka; TOSTES, Maria Emília de Lima; http://lattes.cnpq.br/4197618044519148
This work shows the power management as a management tool for Energy Efficiency in Industry by the side of the energy use in the production process of an industry. An important action in the process is to build the interactivity between users and the electricity. It is proposed the implementation of metering devices, control and diagnosis in order to get a better the use of electricity, and with the acquisition of data from these devices allow management to reduce energy consumption and to make the management aiming at energy efficiency. Presents the results of the system proposed in areas with central refrigerating of a plastic products industry to serve the food industry. The present study, has also applied a methodology used as measurement and verification (M & V) to assess the actual percentage of savings achieved after the implementation of energy efficiency measures.
Acesso aberto (Open Access)
Sistema fuzzy para decisão de handover vertical e maximização da vida útil da bateria em redes multimídia sem fio heterogêneas
(Universidade Federal do Pará, 2019-03-15) COQUEIRO, Thiago Antônio Sidônio; FERREIRA JÚNIOR, José Jailton Henrique; http://lattes.cnpq.br/9031636126268760; FRANCÊS, Carlos Renato Lisboa; http://lattes.cnpq.br/7458287841862567
The applications that consume high bandwidth and energy consumption have been increasing considerably fast in mobile networks. However, the mobile devices do not offer support to battery capacity for the intensive / continuous use of such applications. In addition, mobile networks currently have a high degree of heterogeneity and comprise a wide variety of networks with different technologies, such as LTE, Wi-Fi and WiMAX. Therefore, it is necessary the tradeoff to ensure that QoE is provided to users in this scenario, as well as an energy efficiency strategy designed to extend the battery life of mobile devices. This thesis proposes an intelligent architecture based on Fuzzy logic, capable of providing support to decision making to save the energy of mobile devices within an integrated LTE and Wi-Fi network. Considering user satisfaction, the gains obtained through the PSNR, SSIM and VQM metrics were respectively 32%, 31% and 91% higher than the architecture without Fuzzy logic. Thus, the simulated experiments show the benefits and feasibility of the proposed solution.
Acesso aberto (Open Access)
SmartLVEnergy: um framework para gestão energética inteligente e descentralizada de sistemas legados de baixa tensão
(Universidade Federal do Pará, 2024-07-11) FERNANDES, Rubens de Andrade; GOMES, Raimundo Cláudio Souza; http://lattes.cnpq.br/4244097441063312; COSTA JÚNIOR, Carlos Tavares da; http://lattes.cnpq.br/6328549183075122
Essential for technological and economic progress, electrical energy requires well-founded solutions and strategies for efficient and sustainable management. Existing consumer units, lacking modern technological resources, need gradual alternatives to optimize energy use, making the most of pre-established resources. In this context, retrofit offers an effective update for these infrastructures. Systematic models and strategies can standardize and ensure the replication of these solutions in different contexts through abstractions known as frameworks. However, there is a lack of frameworks to enable the implementation of systematic retrofit strategies for energy management, especially in the low-voltage energy sector. To fill this gap, this thesis presents the SmartLVEnergy framework, proposed to guide the design of innovative retrofit strategies to modernize legacy low-voltage installations with IoT, AIoT, and distributed computing solutions, optimizing energy management with distributed technological resources and advanced predictive capabilities. The experiments conducted in this thesis are presented in the format of aggregated scientific articles, which contributed to the conception of the SmartLVEnergy framework. As a result, it was possible to implement energy management tools in existing building and industrial scenarios in a systematic manner, based on the premises of the proposed framework. The main focus was the analysis and prediction of the energy demand of the installations and their respective circuits, allowing to anticipate and mitigate demand overrun events of the consumer units, following the guidelines of the Brazilian National Electric Energy Agency. The strategies conceived included the development, use, and integration of sensing, communication, and computing resources, distributed locally, in the cloud, and at the edge, according to the principles of the SmartLVEnergy framework, maximizing the use of existing resources according to the specific needs of each installation. The proposed framework is flexible and allows the integration, expandability, and interoperability of technological solutions across legacy systems, enabling operations according to the peculiarities and resources of each pre-existing context. This versatility confirms the relevance of this work as a robust and sustainable proposal to promote energy efficiency today, especially in legacy low-voltage systems.