The Experts below are selected from a list of 7152 Experts worldwide ranked by ideXlab platform
Mauro A S S Ravagnani - One of the best experts on this subject based on the ideXlab platform.
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Heat Exchanger Network synthesis without stream splits using parallelized and simplified simulated annealing and particle swarm optimization
Chemical Engineering Science, 2017Co-Authors: Leandro V Pavao, Caliane Bastos Borba Costa, Mauro A S S RavagnaniAbstract:Abstract Much attention has been paid to Heat Exchanger Network (HEN) synthesis and optimization by using meta-heuristic approaches. In general, Simulated Annealing (SA) is able to provide good solutions, but with large computational efforts. In the present work, a two-level no-split HEN synthesis hybrid method is presented. SA is used for topology optimization, while continuous Heat load variables are handled with Particle Swarm Optimization (PSO). SA is simplified and only one type of move is used (single Heat Exchanger addition), along with group optimizations to improve PSO performance. A parallel processing technique is also presented in order to improve local search performance. The method is tested in 4 medium and large scale benchmark case studies and the no-splits results are compared to literature solutions with and without splits. The solutions presented have lower Total Annual Costs (TAC) when compared to other no-split HENs, and even to some HENs with splits. The proposed method is able to present near-optimal solutions by more efficiently exploring the search space and using simple moves for local searches.
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automated Heat Exchanger Network synthesis by using hybrid natural algorithms and parallel processing
Computers & Chemical Engineering, 2016Co-Authors: Leandro V Pavao, Caliane Bastos Borba Costa, Mauro A S S RavagnaniAbstract:Abstract Heat Exchanger Network (HEN) synthesis can be formulated as an optimization problem, which can be solved by meta-heuristics. These approaches account for a large computational time until convergence. In the present paper the potentialities of applying parallel processing techniques to a non-deterministic approach based on a hybridization between Genetic Algorithms (GA) and Particle Swarm Optimization (PSO) were investigated. Six literature examples were used as benchmarks for the solutions obtained. Comparative experiments were carried out to investigate the time efficiency of the method while implemented using series or parallel processing. The solutions obtained led to lower Total Annual Costs (TAC) than those presented by the literature. As expected, parallel processing usage multiplied the algorithm speed by the number of cores used. Hence, it can be concluded that the proposed method is capable of finding excellent local optimal solutions, and the application of multiprocessing techniques represented a substantial reduction in execution time.
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optimal Heat Exchanger Network synthesis using particle swarm optimization
Optimization and Engineering, 2010Co-Authors: Aline P Silva, Mauro A S S Ravagnani, Evaristo C Biscaia, Jose A CaballeroAbstract:Heat Exchanger Network (HEN) synthesis has been a well-studied subject over the past decades. Many studies and methodologies were proposed to make possible the energy recovery, minimizing the utilities consumption and the number of Heat transfer equipment. Most of papers published in this subject are based on Pinch Analysis and mathematical programming. Some recent papers use meta-heuristic techniques like Genetic Algorithms or Simulated Annealing to solve the HEN synthesis problem and good results are found but with large computational effort. In this paper an optimization model for the synthesis of HEN is proposed. The approach is based on the use of Particle Swarm Optimization to determine the HEN that minimizes the total annualized cost, accounting for capital costs of Heat Exchangers and the energy costs for utilities and pumping duties. The algorithm is based on a superstructure simultaneous optimization model for the HEN synthesis considering stream splitting. Some examples from the literature were used to show the application of the proposed algorithm, and the results confirm the achievement of the optimum HEN configuration with little computational effort.
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optimal Heat Exchanger Network synthesis with the detailed Heat transfer equipment design
Computers & Chemical Engineering, 2007Co-Authors: Mauro A S S Ravagnani, Jose A CaballeroAbstract:This paper presents an optimisation model for the synthesis of Heat Exchanger Networks (HEN) including the detailed design of the equipments formulated as a decomposition method. Shell and tube pressure drops and fouling are considered, as well as mechanical aspects, like shell and tube bundle diameters, internal and external diameter of tubes, number of tubes, number of baffles, number of shells, tube length, tube arrangement and the fluid allocation in the Heat Exchanger. The optimisation model is based on area, energy and pumping costs. The algorithm combines two distinct models, in a decomposition method, a mixed integer non-linear programming (MINLP) superstructure simultaneous optimisation model for the Heat Exchanger Network synthesis considering stream splitting and a MINLP model for the detailed equipment design, following rigorously the standards of the TEMA. Two examples from the literature are used to test the algorithm developed, and the results confirm the achievement of the optimum HEN configuration with the detailed Heat Exchangers design, following the TEMA standards.
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Heat Exchanger Network synthesis and optimisation using genetic algorithm
Applied Thermal Engineering, 2005Co-Authors: Mauro A S S Ravagnani, Aline P Silva, P A Arroyo, A A ConstantinoAbstract:In the last few decades, several papers were published on Heat Exchanger Network synthesis. Most of them present techniques using mathematical programming for the synthesis and optimisation tasks. Recent developments in Heat Exchanger Networks synthesis present some heurist methods, such as genetic algorithm (GA) and simulated annealing. In this paper, a strategy for the synthesis and optimisation of Heat Exchanger Networks was developed using GA. First of all, the ΔTmin is optimised using GA jointly with the problem table, from the Pinch Analysis. By using the optimum ΔTmin, found in the previous stage, the problem is divided in two different regions, below and above the pinch. Thus, using GA, the optimal Networks above and below the pinch are obtained, considering stream splitting as well. Some examples from the literature were solved with the proposed systematic, and results show Heat Exchanger Networks with lower costs than those ones presented in the literature for the cases studied.
Robin Smith - One of the best experts on this subject based on the ideXlab platform.
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Heat Exchanger Network retrofit with a fixed Network structure
Applied Energy, 2014Co-Authors: Ning Jiang, Jacob David Shelley, Steve Doyle, Robin SmithAbstract:Finding cost effective retrofits for Heat Exchanger Networks remains a challenge. Whilst it is often straightforward to find retrofit changes to an existing Network that can improve energy performance, in practice such changes are most often uneconomic. This paper will present an approach to Heat Exchanger Network retrofit around a fixed Network structure. Network energy performance is improved through the selective use of Heat transfer enhancement. A sensitivity analysis is used to find the most effective Heat Exchangers to enhance in order to improve the performance of the overall Network. The sensitivity analysis used is an extension of a previous sensitivity analysis that was introduced to study Network flexibility. The proposed method is applicable for Heat Exchanger Networks involving streams with linear or non-linear physical properties. The enhancement of the most sensitive Heat Exchangers and avoiding new equipment, together with piping and civil engineering costs, allow much more cost-effective Heat Exchanger Network retrofit.
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a novel optimization approach of improving energy recovery in retrofitting Heat Exchanger Network with Exchanger details
Energy, 2013Co-Authors: Robin Smith, Igor BulatovAbstract:Improving energy recovery with retrofitting Heat Exchanger Network has been widely studied in academic and industrial communities. Distinct from most of existing works on HEN retrofit neglecting Exchanger geometry, this paper presents a novel optimization method for dealing with the main Exchanger geometry details in HEN retrofit problems. The addressed details of shell and tube Exchangers include tube passes, shell passes, Heat transfer intensification, logarithmic mean temperature difference (LMTD), and LMTD correction factor (FT), which are systematically identified under given objective function and topological constraints in the existing Heat recovery systems. Based on the recent works proposed by Pan et al. [1] on HEN retrofit scenarios addressing Network topology modification, an efficient optimization framework, consisting of two optimization stages with the implementation of MILP-based iterative method [2], has been developed to deal with the computational difficulties associated with the nonlinearity of LMTD and FT. Case study from literature examples are carried out to demonstrate the validity and soundness of the proposed approach, showing that the new proposed approach is able to provide realistic and practical solutions for debottlenecking of HEN with systematic consideration of Exchanger details.
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retrofit of a Heat Exchanger Network by considering Heat transfer enhancement and fouling
Industrial & Engineering Chemistry Research, 2013Co-Authors: Yufei Wang, Robin SmithAbstract:Many design methods for the retrofit of Heat-Exchanger Networks have been proposed during the last 3 decades. Conventional retrofit methods use additional area to accommodate the increasing Heat duty. However, the implementation of additional area may prove difficult because of topology, safety, and downtime constraints. This problem can be mitigated through the use of Heat-transfer enhancement. This Article investigates the influence of Heat-transfer enhancement on fouling in Heat-Exchanger Networks. A novel design approach is used to solve Heat-Exchanger Network retrofit problems on the basis of Heat-transfer enhancement by considering fouling. Simulated annealing is used to optimize the retrofit problem under fouling conditions. The results show that Heat-transfer enhancement is a very attractive option for retrofitting when fouling is considered. The consideration of fouling in Heat-transfer enhancement has the potential to make a significant impact on retrofit design and to make the design more cost-...
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Heat Exchanger Network retrofit optimization involving Heat transfer enhancement
Applied Thermal Engineering, 2012Co-Authors: Yufei Wang, Robin SmithAbstract:Heat Exchanger Network retrofit plays an important role in energy saving in process industry. Many design methods for the retrofit of Heat Exchanger Networks have been proposed during the last three decades. Conventional retrofit methods rely heavily on topology modifications which often result in a long retrofit duration and high initial costs. Moreover, the addition of extra surface area to the Heat Exchanger can prove difficult due to topology, safety and downtime constraints. Both of these problems can be avoided through the use of Heat transfer enhancement in Heat Exchanger Network retrofit. This paper presents a novel design approach to solve Heat Exchanger Network retrofit problems based on Heat transfer enhancement. An optimisation method based on simulated annealing has been developed to find the appropriate Heat Exchangers to be enhanced and to calculate the level of enhancement required. The physical insight of enhanced Exchangers is also analysed. The new methodology allows several possible retrofit strategies using different retrofit methods be determined. Comparison of these retrofit strategies demonstrates that retrofit modification duration and payback time are reduced when Heat transfer enhancement is utilised. Heat transfer enhancement can be also used as a substitute for increased Heat Exchanger Network surface area to reduce retrofit investment costs.
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improving energy recovery in Heat Exchanger Network with intensified tube side Heat transfer
Chemical engineering transactions, 2011Co-Authors: Igor Bulatov, Robin SmithAbstract:Implementing tube-inserts, namely tube-side enhancement, is an efficient way to increase the Heat transfer coefficients of shell and tube Heat Exchangers, which can achieve substantial energy saving in Heat Exchanger Network (HEN) if suitable retrofit strategies are used (Pan et al., 2011). In this paper, a new optimization method is proposed to consider more details of tube-side enhancement for HEN retrofitting, such as multiple tube passes, logarithmic mean temperature difference (LMTD), LMTD correction factor (FT). Even though LMTD and FT will lead to complex nonlinear terms in mathematical programming, the proposed approach can deal with the relevant computational difficulties efficiently. The validity of new optimization approach is illustrated with solving a literature example (Li and Chang, 2010). Copyright ? 2011, AIDIC Servizi S.r.l.
Hui-chu Chen - One of the best experts on this subject based on the ideXlab platform.
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Heat Exchanger Network synthesis involving organic rankine cycle for waste Heat recovery
Industrial & Engineering Chemistry Research, 2014Co-Authors: Cheng-liang Chen, Tzu-hsiang Chao, Feng-yi Chang, Hui-chu ChenAbstract:This article aims to present a mathematical model for the synthesis of a Heat-Exchanger Network (HEN) which can be integrated with an organic Rankine cycle (ORC) for the recovery of low-grade waste Heat from the Heat surplus zone of the background process. An ORC-incorporated stagewise superstructure considering all possible Heat-exchange matches between process hot/cold streams and the ORC is first presented. On the basis of this superstructure, the model for synthesizing ORC-integrated HENs is formulated as a mixed-integer nonlinear program (MINLP). A two-step solution procedure is proposed to solve the MINLP model. First, a stand-alone HEN is synthesized to minimize the external utility consumption. An ORC is then incorporated into the HEN with the objective of maximizing the work produced from waste Heat (in the Heat surplus zone below the process pinch) without increasing the use of a hot utility. A literature example is solved to demonstrate the application of the proposed model for industrial waste...
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Heat-Exchanger Network Synthesis Involving Organic Rankine Cycle for Waste Heat Recovery
Industrial & Engineering Chemistry Research, 2014Co-Authors: Cheng-liang Chen, Tzu-hsiang Chao, Feng-yi Chang, Hui-chu Chen, Jui-yuan LeeAbstract:This article aims to present a mathematical model for the synthesis of a Heat-Exchanger Network (HEN) which can be integrated with an organic Rankine cycle (ORC) for the recovery of low-grade waste Heat from the Heat surplus zone of the background process. An ORC-incorporated stagewise superstructure considering all possible Heat-exchange matches between process hot/cold streams and the ORC is first presented. On the basis of this superstructure, the model for synthesizing ORC-integrated HENs is formulated as a mixed-integer nonlinear program (MINLP). A two-step solution procedure is proposed to solve the MINLP model. First, a stand-alone HEN is synthesized to minimize the external utility consumption. An ORC is then incorporated into the HEN with the objective of maximizing the work produced from waste Heat (in the Heat surplus zone below the process pinch) without increasing the use of a hot utility. A literature example is solved to demonstrate the application of the proposed model for industrial waste Heat recovery.
Cheng-liang Chen - One of the best experts on this subject based on the ideXlab platform.
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Heat Exchanger Network synthesis involving organic rankine cycle for waste Heat recovery
Industrial & Engineering Chemistry Research, 2014Co-Authors: Cheng-liang Chen, Tzu-hsiang Chao, Feng-yi Chang, Hui-chu ChenAbstract:This article aims to present a mathematical model for the synthesis of a Heat-Exchanger Network (HEN) which can be integrated with an organic Rankine cycle (ORC) for the recovery of low-grade waste Heat from the Heat surplus zone of the background process. An ORC-incorporated stagewise superstructure considering all possible Heat-exchange matches between process hot/cold streams and the ORC is first presented. On the basis of this superstructure, the model for synthesizing ORC-integrated HENs is formulated as a mixed-integer nonlinear program (MINLP). A two-step solution procedure is proposed to solve the MINLP model. First, a stand-alone HEN is synthesized to minimize the external utility consumption. An ORC is then incorporated into the HEN with the objective of maximizing the work produced from waste Heat (in the Heat surplus zone below the process pinch) without increasing the use of a hot utility. A literature example is solved to demonstrate the application of the proposed model for industrial waste...
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Heat-Exchanger Network Synthesis Involving Organic Rankine Cycle for Waste Heat Recovery
Industrial & Engineering Chemistry Research, 2014Co-Authors: Cheng-liang Chen, Tzu-hsiang Chao, Feng-yi Chang, Hui-chu Chen, Jui-yuan LeeAbstract:This article aims to present a mathematical model for the synthesis of a Heat-Exchanger Network (HEN) which can be integrated with an organic Rankine cycle (ORC) for the recovery of low-grade waste Heat from the Heat surplus zone of the background process. An ORC-incorporated stagewise superstructure considering all possible Heat-exchange matches between process hot/cold streams and the ORC is first presented. On the basis of this superstructure, the model for synthesizing ORC-integrated HENs is formulated as a mixed-integer nonlinear program (MINLP). A two-step solution procedure is proposed to solve the MINLP model. First, a stand-alone HEN is synthesized to minimize the external utility consumption. An ORC is then incorporated into the HEN with the objective of maximizing the work produced from waste Heat (in the Heat surplus zone below the process pinch) without increasing the use of a hot utility. A literature example is solved to demonstrate the application of the proposed model for industrial waste Heat recovery.
Jui-yuan Lee - One of the best experts on this subject based on the ideXlab platform.
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Heat-Exchanger Network Synthesis Involving Organic Rankine Cycle for Waste Heat Recovery
Industrial & Engineering Chemistry Research, 2014Co-Authors: Cheng-liang Chen, Tzu-hsiang Chao, Feng-yi Chang, Hui-chu Chen, Jui-yuan LeeAbstract:This article aims to present a mathematical model for the synthesis of a Heat-Exchanger Network (HEN) which can be integrated with an organic Rankine cycle (ORC) for the recovery of low-grade waste Heat from the Heat surplus zone of the background process. An ORC-incorporated stagewise superstructure considering all possible Heat-exchange matches between process hot/cold streams and the ORC is first presented. On the basis of this superstructure, the model for synthesizing ORC-integrated HENs is formulated as a mixed-integer nonlinear program (MINLP). A two-step solution procedure is proposed to solve the MINLP model. First, a stand-alone HEN is synthesized to minimize the external utility consumption. An ORC is then incorporated into the HEN with the objective of maximizing the work produced from waste Heat (in the Heat surplus zone below the process pinch) without increasing the use of a hot utility. A literature example is solved to demonstrate the application of the proposed model for industrial waste Heat recovery.
