Heat Exchanger Network
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. MULTIVARIABLE OPTIMAL CONTROL OF A HEAT EXCHANGER NETWORK WITH BYPASSES
Abstract Heat exchanger networks present an interesting control problem due to coupling among process streams. In this work, the linear quadratic regulator (LQR), a feedback optimal control technique, is used to control stream temperatures on a laboratory scale heat exchanger network, through bypass manipulation, in a multivariable system. The LQR design was
Braz. J. Chem. Eng.. Publicado em: 2016-03
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2. Controle multivariável em redes de trocadores de calor com bypasses. / Multivariable control on a heat exchanger network with bypasses.
Atualmente, existe uma grande variedade de metodologias de controle que poderiam ser utilizadas e aplicadas a processos industriais. Algumas destas metodologias têm um projeto complexo, exigindo um estudo extra de engenharia para projetar um controlador com um desempenho excelente. Outros controladores não apresentam um desempenho tão bom, embora apresent
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/04/2011
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3. Heat integration of an Olefins Plant: Pinch Analysis and mathematical optimization working together
This work explores a two-step, complexity reducing methodology, to analyze heat integration opportunities of an existing Olefins Plant, identify and quantify reduction of energy consumption, and propose changes of the existing heat exchanger network to achieve these goals. Besides the analysis of plant design conditions, multiple operational scenarios were c
Brazilian Journal of Chemical Engineering. Publicado em: 2011-03
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4. A new strategy for retrofit of heat exchanger networks / Uma nova estrategia para reestruturação de redes de trocadores de calor
ese é proposta uma nova estratégia para o projeto de reestruturação de redes de trocadores de calor, qualquer que seja seu objetivo: ampliação de carga ou modificações das condições operacionais, otimização da recuperação de energia, melhor atendimento das demandas do processo industrial, etc. Esta proposta é baseada num método consagrado, co
Publicado em: 2008
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5. Dynamics and control of heat exchanger networks / Dinamica e controle de redes de trocadores de calor
Energy integration among chemical process streams can lead to quite complex heat exchanger networks (HEN) with difficulties in terms of controI. In this work HEN dynamics and steady state aspects were addressed with the aim of proposing a control strategy that minimizes utility consumption and satisfies imposed specifications. A steady state model of the HEN
Publicado em: 2007
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6. Análise de métodos de agrupamento para o treinamento de redes neurais de base radical aplicadas à identificação de sistemas
For complex systems, modeling using basic laws to determine their dynamic behavior is not always possible. An alternative to solve these problems is use concepts of systems identification. Trough system identification it is possible to determine a mathematical model based on input and output data of the system. When little prior knowledge is available, it is
Publicado em: 2006
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7. The importance of control considerations for heat exchanger network synthesis: a case study
Cost optimization in the synthesis decision tree often leads to a reduced degree of freedom which degrades the process’s ability to reject disturbances as a consequence of low controllability. In fact, Heat Exchanger Networks (HENs) obtained by traditional synthesis procedures that ignore controllability aspects must be evaluated in this context a posterio
Brazilian Journal of Chemical Engineering. Publicado em: 2001-06
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8. The influence of heat exchanger design on the synthesis of heat exchanger networks
Heat exchanger network (HEN) synthesis has been traditionally performed without accounting for a more detailed unit design, which is important since the final HEN may require unfeasible units. Recently, publications on this matter have appeared, as well as softwares that simultaneously perform synthesis and units design. However, these publications do not cl
Brazilian Journal of Chemical Engineering. Publicado em: 2000-12
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9. Operational cost minimization in cooling water systems
In this work, an optimization model that considers thermal and hydraulic interactions is developed for a cooling water system. It is a closed loop consisting of a cooling tower unit, circulation pump, blower and heat exchanger-pipe network. Aside from process disturbances, climatic fluctuations are considered. Model constraints include relations concerning t
Brazilian Journal of Chemical Engineering. Publicado em: 2000-12
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10. Fluid dynamical considerations on heat exchanger networks
The synthesis and analysis of heat exchanger networks are issues of great industrial interest due to the possibilities of decreasing plant costs, through the reduction of the utilities consumption and/or the number of equipments, in a grassroot design or retrofitting an existent network. The present paper explores a new design algorithm based on the Total An
Brazilian Journal of Chemical Engineering. Publicado em: 2000-03
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11. Aspectos operacionais e estruturais em "retrofit" de redes de trocadores de calor
The study of retrofit procedures for heat exchanger networks has been subject of numerous research work, due to its importance in inergy-saving policies in chemical processes. Early work focused on the cost (and area) estimation of the additional exchangers required to achieve the new process conditions, without considering the layout of the existing network
Publicado em: 1999
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12. Otimização energetica de rede de trocadores de calor : abordagem multi-objetivo em grafo generalizado
This work develops an optimization model for heat exchanger network synthesis which adequately represents the actual process. The model allows the evaluation of the intluence of the minimum utility usage and of the minimum heat transfer area in the heat exchange process. Rather than presenting a single solution where one of the objectives has been optimized,
Publicado em: 1997