Exergetic Analysis
Mostrando 1-12 de 21 artigos, teses e dissertações.
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1. Human thermal comfort: an irreversibility-based approach emulating empirical clothed-body correlations and the conceptual energy balance equation
Exergetic analysis can provide useful information as it enables the identification of irreversible phenomena bringing about entropy generation and, therefore, exergy losses (also referred to as irreversibilities). As far as human thermal comfort is concerned, irreversibilities can be evaluated based on parameters related to both the occupant and his surround
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012-12
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2. CFD analysis of the pulverized coal combustion processes in a 160 MWe tangentially-fired-boiler of a thermal power plant
The strategic role of energy and the current concern with greenhouse effects, energetic and exergetic efficiency of fossil fuel combustion greatly enhance the importance of the studies of complex physical and chemical processes occurring inside boilers of thermalpower plants. The state of the art in computational fluid dynamics and the availability of commer
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-12
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3. Exergy and thermoeconomic evaluation of a petroleum refinery hydrogem production unit. / Produção de hidrogênio em refinarias de petróleo: avaliação exergética e custo de produção.
Pure hydrogen (H2) is an useful gas in chemical and petrochemical industries because it reacts easily with several other elements. On refineries, hydrogen is used to sequestrate sulphur from diesel and gasoline. Emission restrictions regard to fossil fuels are rising the world hydrogen demands. In spite of its abundance, hydrogen is normally found associated
Publicado em: 2010
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4. Hydrogen from biomass gas steam reforming for low temperature fuel cell: energy and exergy analysis
This work presents a method to analyze hydrogen production by biomass gasification, as well as electric power generation in small scale fuel cells. The proposed methodology is the thermodynamic modeling of a reaction system for the conversion of methane and carbon monoxide (steam reforming), as well as the energy balance of gaseous flow purification in PSA (
Brazilian Journal of Chemical Engineering. Publicado em: 2009-03
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5. Analise do desempenho termodinamico e ambiental de um ciclo de refrigeração e proposta de uma função global de avaliação / Thermodynamic and enviromental analisys of a refrigerator cycle performance and propose of a global function evaluation
This work presents a proposal function to vapor compression refrigerator cycle performance from environmental and thermodynamic point of view. The function was developed through the statistic analysis of a refrigerator cycle computational results. The proposal function represents an evaluation indice of efficiency and environment criterions and was developed
Publicado em: 2009
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6. Otimização exergetica de um sistema coletor-armazenador de calor latente / Exergetic optimization of a collector-storage system of latent heat
This work deals with the exergetic optimization of a solar thermal energy system. This consists of a solar collector and a rectangular water storage tank that contains a phase change material distributed in an assembly of slabs. The study takes into account both conduction and convection heat transfer modes for water in the solar collector, and also the phas
Publicado em: 2008
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7. Exergetic analysis of cascade cycle for natural gas liquefaction / Analise exergetica de um ciclo em cascata para liquefação de gas natural
O comércio de gás natural liquefeito apresenta um crescente interesse por parte tanto de países exportadores como dependentes desta fonte energética. Apesar de o transporte por gasoduto ser muito menos suscetível a perdas, ele se torna inviável a longas distâncias ou a demandas variáveis. A liquefação do gás natural também proporciona o armazenam
Publicado em: 2008
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8. Integração termica e otimização termoeconomica aplicadas ao processo industrial de produção de açucar e etanol a partir da cana-de-açucar / Thermal integration and termoeconomic optimization applied to the industrial process of sugar and ethanol from surgacane
A produção de açúcar e etanol a partir da cana-de-açúcar no Brasil compõe um dos setores mais importantes da economia nacional e tem se caracterizado, ao longo de sua história, pelo alto consumo de energia no processo industrial. O uso do bagaço de cana como combustível para o sistema de cogeração permite que as usinas sejam auto-suficientes em e
Publicado em: 2008
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9. Energetic and exergetic analysis of a vapor compression refrigeration system operating with HC290 as an alternative to HCFC22 / Analise energetica e exergetica de um ciclo de refrigeração por compressão de vapor utilizando HC290 em substituição ao HCFC22
Este trabalho teve como objetivo analisar experimentalmente um sistema de refrigeração por compressão de vapor operando com o hidrocarboneto propano (R290) em substituição ao refrigerante HCFC22, visando atender as necessidades do mercado atual de refrigeração comercial, que busca alternativas que atendam à exigência de substituição gradual dos re
Publicado em: 2008
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10. Exergetic and economic analysis of an industrial distillation column
In this work, applications of exergy and economic concepts to compression, heat exchange, and separation processes were used for calculation of the irreversibility rate, thermodynamic efficiency, and internal rate of return (IRR) of the profitability. A case study based on a real process, the purification of 1,2-dichloroethane (DCE) in a high-purity distilla
Brazilian Journal of Chemical Engineering. Publicado em: 2007-09
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11. Análise exergética, termoeconômica e ambiental de uma usina termoelétrica: estudo de caso: usina termoelétrica UTE - Rio Madeira da Eletronorte / Exergetic, thermoeconomic and environmental assessment of a power generation plant: case study: rio Madeira Thermoeletric Power Plant
This work mainly discusses the theory and application of three analyses based on the concept of exergy. In a chapter 4 called Estudo de Caso an exergetic and thermoeconomic analysis on a real power generation system are carried out, and an environmental analysis on that system is executed in the chapter 5. This real power generation system is the gas turbine
Publicado em: 2007
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12. Analise termodinamica de um sistema de cogeração com gaseificação de licor negro / Termodynamic analysis of a cogeneration system with blak liquor gasification
The pulp and paper industries generate most part of energy for self consumption burning two different fuels: biomass and black liquor, which is more used than the first one. This industrial sector has been used cogeneration systems, to produce electric energy from the combustion of these fuels. In the last years an increase in the production of the industrie
Publicado em: 2007