Heat Exchanger Networks
Mostrando 1-11 de 11 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. 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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3. 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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4. 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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5. 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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6. 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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7. Energy and capital targets for constrained heat exchanger networks
A new procedure for estimating area and capital cost targets of constrained heat exchanger networks is presented. The method allows for match constrained networks and exchangers with more than one tube pass. The procedure is based on modelling the problem as a non-linear formulation where the forbidden exchanger matches are included as constraints and the te
Brazilian Journal of Chemical Engineering. Publicado em: 2000-12
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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. 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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10. Sintese de sistemas de recuperação de energia para trocadores do tipo casco e tubos com restrições de troca termica
Um novo procedimento de estimativa de área e custos de capital para sistemas sob integração energética é proposto. Este método permite que restrições de troca térmica e trocadores com mais de uma passagem nos tubos sejam utilizados. O método desenvolvido resulta em um modelo não linear onde, balanços de energia, restrições de troca térmica e o
Publicado em: 2000
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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