First Law Of Thermodynamics
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. THERMAL DESALINATION AS AN OPTION FOR WATER SUPPLY: A STUDY OF THERMAL DESALINATION TECHNOLOGY AND PRELIMINARY ECONOMIC FEASIBILITY ANALYSIS / A DESSALINIZAÇÃO TÉRMICA COMO ALTERNATIVA PARA ABASTECIMENTO DE ÁGUA: ESTUDO DA TÉCNICA DE DESSALINIZAÇÃO TÉRMICA E AVALIAÇÃO ECONÔMICA PRELIMINAR
A dessalinização térmica é uma técnica utilizada em diversas partes do mundo para produção de água. Países como Estados Unidos, Israel, Espanha e Grécia utilizam esse tipo de sistema em grande escala, garantindo um abastecimento constante para alguns pontos de seu território e contribuindo para o aperfeiçoamento dos sistemas de produção. No Bra
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/09/2011
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2. A primeira lei da termodinâmica dos processos homogêneos
Thermodynamics of homogeneous processes, which corresponds to the very special situation in thermodynamics of continuous media, is used to discuss the first law. An important part of this work is the exposition of some typical mathematical errors, frequently found in the traditional presentation of thermodynamics. The concepts of state and process functions
Química Nova. Publicado em: 2009
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3. Estudo e desenvolvimento de código computacional para análise de impacto entre estruturas levando em consideração efeitos térmicos / Study and development of computational code to analyze impact in structures considering thermal effects
It becomes quite important study the thermal effects when considering impact in structures, because besides the mechanical energy changing into heat, one may consider the changes in the material properties due overheating. In this sense, the main goal of this work is develop a thermodynamic formulation and its implementation, based in the Helmholtz free-ener
Publicado em: 2009
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4. Calor e trabalho: são estes conceitos invariantes sob a permuta sistema-vizinhança?
It is argued that the invariants associated to the First Law of Thermodynamics and to the concept of identical processes lead to a clear definition of heat and work. The conditions for heat and work to be invariant under a system-surroundings interchange are also investigated. Finally, examples are presented to illustrate the above conditions.
Química Nova. Publicado em: 2008
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5. Metodologia numérica para análise de secagem de grãos em leito fixo pela primeira e segunda Lei da Termodinâmica / Numerical methodology for analyzing deep bed grain drying by first and second laws of Thermodynamics
This work presents a methodology for analyzing deep bed grain dryers by means of the first and second laws of thermodynamics. The thermodynamic modeling is a more complex extension of a literature-available thermodynamic modeling of fluidized bed dryers, which involves a system of lumped mass and energy equations. Thus, the present analysis involved a system
Publicado em: 2008
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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. Sobre a primeira lei da termodinâmica: as diferenciais do calor e do trabalho
We treat some subtleties concerning the First Law of Thermodynamics and discuss the inherent difficulties, namely the interpretation of the heat and the work differentials. By proposing a new differential equation for the First Law, which is written using both system and neighborhood variables, we overcome the mentioned difficulties and establish a criterion
Química Nova. Publicado em: 2007-04
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8. Desenvolvimento e validação de um modelo conceitual de aeração em vertedores. / Development and validation of a conceptual model of aeration in spillways.
This study adress prompt aeration in spillways reaching to reduce the cavitation effects on them. References were based on introduction to cavitation machanism and, state of art survey, to leave on not only earlier studies, but also on classical and most recent ones. Based on principles of Physics, such as Mass Conservation and the First Law of Thermodynamic
Publicado em: 2007
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9. Criação da matéria em cosmologias com velocidade da luz variável e eletrônico não-linear
In this work we obtain the cosmological solutions and investigate the thermodynamics of matter creation in two diferent contexts. In the first we propose a cosmological model with a time varying speed of light c. We consider two diferent time dependence of c for a at Friedmann-Robertson- Walker (FRW) universe. We write the energy conservation law arising fro
Publicado em: 2006
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10. Reflexões sobre a contribuição da Carnot à primeira lei da termodinâmica
The classical interpretations of Nicolas Léonard Sadi Carnot on some physical principles involved in the operation of heat engines were fundamental to the development and formulation of the Second Law of Thermodynamics. Moreover, an accurate historical survey clearly reveals that Carnot was, by that time, also well aware about some new concepts, which were
Química Nova. Publicado em: 2004-06
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11. Sobre a primeira lei da termodinâmica
Entropy is a concept that has long stimulated human curiosity, resulting in an huge intelectual production. The same has not occurred for the first law of thermodynamics, perhaps because of its apparent obviousness. In this article the first law presentation, as displayed in most traditional physical chemistry textbooks, is criticized. An alternative view is
Química Nova. Publicado em: 2001-08
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12. Avaliação de um forno intermitente de ceramica vermelha usando bagaço de cana como combustivel
In this work the evaluation of a ceramic inverted flame intermittent kiln with total substitution of firewood by in nature sugar cane bagasse (50 % of moisture h.b.) is presented. In this kiln is burned only bagasse, differently from other ones tested by the IPT (Institute of technological research), in which in the initial stage firewood is burned and bagas
Publicado em: 1996