Exergetic Analysis
Mostrando 13-21 de 21 artigos, teses e dissertações.
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13. Analysis of diesel engine operation with biodiesel blends / Analise da operação de motores diesel com misturas parciais de biodiesel
As conseqüências da adição de biodiesel ao óleo diesel foram estudadas estabelecendo-se relações de causa e efeito entre o desempenho do motor e os processos de combustão e formação de mistura. Foram incluídos, nesta discussão, aspectos como emissões poluentes, formação de mistura, dinâmica do processo de combustão, eficiência de conversão
Publicado em: 2006
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14. Avaliação exergética dos efluentes do processo industrial do álcool / Exergetic assessment of effluents in the industrial alcohol process
In the production of ethyl alcohol as a fuel, the sugar and alcohol industry captures large volumes of water for steam generation, for cooling and as part of the process, generating large amounts of effluents. Using the energy produced by the burning of bagasse in the furnace for the transformation of water into steam, the industry generates its own electric
Publicado em: 2005
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15. ANÁLISE DE UM SISTEMA DE PRODUÇÃO SIMULTÂNEA DE ELETRICIDADE, FRIO E CALOR / ANALYSIS OF A SYSTEM FOR THE SIMULTANEOUS PRODUCTION OF ELECTRICAL ENERGY, HEAT AND COLD
The simultaneous production of electric energy, heat and cooling capacity from the primary fuel burning on a heat engine (trigeneration) can emerge as a promising strategy, from the energy and project points of view, mostly, in food and chemistry industries. The present work describes the experimental study of a vapor compression system for chilled water pro
Publicado em: 2005
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16. Otimização exergoeconômica de ciclos de absorção para geração de potência
In this work it was shown that an aqua-ammonia absorption cycle presents an economical advantage as a bottoming-cycle in a cogeneration plant. To accomplish that, two cycles were compared: a Rankine cycle and a Kalina cycle. The former is an especially designed cycle for use of aqua-ammonia mixtures as working fluid. A computational routine was implemented t
Publicado em: 2003
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17. Avaliação termoeconomica do sistema de cogeração da usina vale do rosário
In the present work, a cogeneration system of a sugar-alcohol cane mill isevaluated. Using the Exergetic Cost Theory, a thermoeconomic analysis is made for three crops, corresponding to the years of 1996, 1997 and 1998. Previusly, na energetic and exergetic analysis was made, determining the first and second law equipment s efficiencies and also some perform
Publicado em: 1999
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18. Analise energetica de plantas de produção de cimento Portland
This work presents an energetic analysis of the production processes of Portland Cement, based in the evaluation of the efficiency through the second law of thermodynamics and the concepts of rational efficiency and thermoeconomy. The characteristics of the raw materiaIs, the reactions of their compounds in the clinker manufacturing, and the fuels used are d
Publicado em: 1994
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19. Considerações ambientais em termoeconomia : um estudo de caso
A thermodynamic analysis was carried out for a coke dry quenching (CDQ) unit of Brazilian iron &steel making plant. By means of the exergetic analysis it is stressed that the dry process is more adequate regarding energy consumption and impact on the environment than the wet (CWQ). Manufacturer data were used and expressions were developed to estimate the ge
Publicado em: 1994
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20. Desenvolvimento e avaliação de uma bomba de calor usada no condicionamento de ar para secagem de alimentos
A heat pump made up of a reciprocating compressor driven by a 1.1 kW electric motor, an air condenser, a dry expansion evaporator, filled with R22 refrigerant fluid and fully instrumented was circuited to a tray dryer. Ambient air was sucked through the evaporator, flowed outside the condenser and was blown into the dryer. The thermodynamic performance of th
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/05/1993
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21. Analise exergetica de motores a gasolina e a alcool
In this work a model is developed to simulate the heat transfer, combustion, admission and exhaust processes in spark-ignition internal combustion engines. The model obtained is able to evaluate the thermodynamic properties - including the exergy - of each portion of the working fluid (air, fuel, combustion products and residues). Usual characteristics obtai
Publicado em: 1990