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Добірка наукової літератури з теми "Heat exchangers network"

Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 31 травня 2022

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Статті в журналах з теми "Heat exchangers network"

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Ge, Yu Lin, Ping Wang, Sheng Qiang Shen, and Jun Liang Xu. "Synthesis Method of Heat Exchanger Network for Distillation Device." Advanced Materials Research 199-200 (February 2011): 1509–12. http://dx.doi.org/10.4028/www.scientific.net/amr.199-200.1509.

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Mathematical programming model for synthesis of heat exchanger network for distillation unit is established. MINLP problem for heat exchanger network is solved by branch-bound method. Two kinds of heat exchanger network with splitting stream and without splitting stream are obtained. 142 heat exchangers, 8 coolers and 4 heaters are needed in the heat exchanger network without splitting stream. 34 heat exchangers, 8 coolers, 4 heaters, 11 splitters and 11 mixers are needed in the heat exchanger network with splitting stream. The matching situation including heat load, heat exchange area, duty of utilities, flow fraction of splitting, temperature of inlet and outlet, etc. for cold and hot streams in the heat exchanger network with splitting stream is presented in detail, Analysis the relationship between total heat exchange area, total heat load, total capital cost and annual operation cost of the heat exchanger network. Taking the number of heat exchangers and operational flexibility of heat exchange network into consideration, the heat exchanger network with splitting stream is suggested to be selected.
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Ramezanpour Jirandeh, Reza, Mehrangiz Ghazi, Amir Farhang Sotoodeh, and Mohammad Nikian. "Plate-fin heat exchanger network modeling, design and optimization – a novel and comprehensive algorithm." Journal of Engineering, Design and Technology 19, no. 5 (January 11, 2021): 1017–43. http://dx.doi.org/10.1108/jedt-07-2020-0262.

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Purpose The purpose of this paper is to present a novel and applied method for optimum designing of plate-finned heat exchanger network. Considering the total annual cost as the objective function, a network of plate-finned heat exchanger is designed and optimized. Design/methodology/approach Accurate evaluation of plate-finned heat exchanger networks depends on different fin types with 10 different geometrical parameters of heat exchangers. In this study, fin numbers are considered as the main decision variables and geometrical parameters of fins are considered as the secondary decision variables. The algorithm applies heat transfer and pressure drop coefficients correction method and differential evolution (DE) algorithm to obtain the optimum results. In this paper, optimization and minimization of the total annual cost of heat exchanger network is considered as the objective function. Findings In this study, a novel and applied method for optimum designing of plate-finned heat exchanger network is presented. The comprehensive algorithm is applied into a case study and the results are obtained for both counter-flow and cross-flow plate-finned heat exchangers. The total annual cost and total area of the network with counter-flow heat exchangers were 12.5% and 23.27%, respectively, smaller than the corresponding values of the network with cross-flow heat exchanger. Originality/value In this paper, a reliable method is used to design, optimize parameters and the economic optimization of heat exchanger network. Taking into account the importance of plate-finned heat exchangers in industrial applications and the complexity in their geometry, the DE methodology is adopted to obtain an optimal geometric configuration. The total annual cost is chosen as the objective function. Applying this technique to a case study illustrates its capability to accurate design plate-finned heat exchangers to improve the objective function of the heat exchanger network from the economic viewpoint with the design of details.
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Zhang, Yin, Yinping Zhang, and Xin Wang. "Inverse Problem Method to Optimize Cascade Heat Exchange Network in Central Heating System." International Journal of Energy Optimization and Engineering 9, no. 3 (July 2020): 62–82. http://dx.doi.org/10.4018/ijeoe.2020070105.

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In central heating systems, heat is often transferred from heat source to users by the heat network where several heat exchangers are installed at the heat source, substations, and terminals. In this article, the mathematical optimization model of the cascade heat exchange network with three-stage heat exchangers in a series is established. The aim is to maximize the cold fluid temperature for a given hot fluid temperature and overall heating capacity, the optimal heat exchange area distribution, and the medium fluid flow rates are determined through an inverse problem and variation method. The results show that the heat exchange areas should be distributed equally for each heat exchanger. It also indicates that in order to improve the thermal performance of the whole system, more heat exchange areas should be allocated to the heat exchanger where flow rate difference between two fluids is relatively small.
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Wang, Bohong, Jiří Jaromír Klemeš, Petar Sabev Varbanov, and Min Zeng. "An Extended Grid Diagram for Heat Exchanger Network Retrofit Considering Heat Exchanger Types." Energies 13, no. 10 (May 24, 2020): 2656. http://dx.doi.org/10.3390/en13102656.

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Анотація:
Heat exchanger network (HEN) retrofit is a vital task in the process design to improve energy savings. Various types of heat exchangers such as shell and tube, double-pipe, compact plate, and spiral tube have their working temperature ranges and costs. Selecting suitable types of heat exchangers according to their temperature ranges and costs is a crucial aspect of industrial implementation. However, considering the type of heat exchangers in the HEN retrofit process is rarely seen in previous publications. This issue can be solved by the proposed Shifted Retrofit Thermodynamic Grid Diagram with the Shifted Temperature Range of Heat Exchangers (SRTGD-STR). The temperature ranges of six widely used heat exchanger types are coupled in the grid diagram. This diagram enables the visualisation of identifying the potential retrofit plan of HEN with heat-exchanger type selection. The retrofit design aims to minimise utility cost and capital cost. An illustrative example and a case study are presented to show the effectiveness of the method.
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Rauch, Martina, and Antun Galovic. "Energy analysis of heat exchanger in a heat exchanger network." Thermal Science 22, no. 5 (2018): 1999–2011. http://dx.doi.org/10.2298/tsci171231216r.

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For many years now, heat exchanger optimization has been a field of research for a lot of scientists. Aims of optimization are different, having in mind heat exchanger networks with different temperatures of certain streams. In this paper mathematical model in dimensionless form is developed, describing operation of one heat exchanger in a heat exchanger network, with given overall area, based on the maximum heat-flow rate criterion. Under the presumption of heat exchanger being a part of the heat exchanger network, solution for the given task is resting in a possibility of connecting an additional fluid stream with certain temperature on a certain point of observed heat exchanger area. The connection point of additional fluid stream determines the exchanging areas of both heat exchangers and it needs to allow the maximum exchanged heat-flow rate. This needed heat-flow rate achieves higher value than the heat-flow rate acquired by either of streams. In other words, a criterion for the existence of the maximum heat-flow rate, as a local extremum, is obtained within this mathematical model. Results of the research are presented by the adequate diagrams and are interpreted, with emphasis on the cases which fulfill and those which do not fulfill the given condition for achieving the maximum heat-flow rate.
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Frank, L. M. Pua, and (Frank) X. X. Zhu. "Integrated Heat Exchanger Network and Equipment Design Using Compact Heat Exchangers." Heat Transfer Engineering 23, no. 6 (November 2002): 18–35. http://dx.doi.org/10.1080/01457630290098691.

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Markowski, Mariusz, and Krzysztof Urbaniec. "Optimal cleaning schedule for heat exchangers in a heat exchanger network." Applied Thermal Engineering 25, no. 7 (May 2005): 1019–32. http://dx.doi.org/10.1016/j.applthermaleng.2004.06.025.

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Huda, Hairul, Renanto Handogo, Totok Ruki Biyanto, Wei Wu, and Vincentius Surya Kurnia Adi. "Oil Refinery Heat Exchanger Network Cleaning Scheduling Strategy with Unit Cleanability Consideration." ASEAN Journal of Chemical Engineering 20, no. 1 (June 29, 2020): 31. http://dx.doi.org/10.22146/ajche.51880.

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Анотація:
Heat exchanger networks (HENs) play an important role in the chemical industries. Unfortunately, fouling is inevitable in heat exchangers operation. Therefore, the optimal cleaning procedure is required to restore heat exchangers' performance periodically. A systematic cleaning scheduling strategy for the heat exchanger network in an oil refinery is proposed in this work. There are 11 operating heat exchangers in an oil refinery to be reviewed. Different cleaning decision scenarios based on the overall heat transfer coefficient are explored for optimal cleaning schedule performance. The daily number of exchangers available to be cleaned i.e., the unit cleanability, is investigated while minimizing the energy consumption and the additional heat requirement due to the offline heat exchanger under cleaning procedure. The HEN performance and the energy-saving from the cleaning procedures are benchmarked with the uncleaned HEN. The results indicate that the cleaning procedure significantly increases the HEN performance and simultaneously reduces the heat requirement if compared to the untreated HEN benchmark. The possible conflicting situation is discussed when some heat exchangers are waiting to be cleaned due to the unit cleanability restriction, which allows the overall heat transfer coefficient to be below the allowed limit. Therefore, nonconflicting cleaning scheduling is also addressed in this work by relaxing the unit cleanability limit. Furthermore, the optimal cleaning schedule is also suggested for user reference. In this work, the optimum cleaning schedule with minimum energy consumption and maximum energy saving could be achieved when cleaning decision limit is set at 40% decrease of overall heat transfer coefficient. In the contrast, the lowest number of cleaning procedures is associated with 90% decrease in the overall heat transfer coefficient as the cleaning decision limit.
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Dı´az, Gerardo, Mihir Sen, K. T. Yang, and Rodney L. McClain. "Adaptive Neurocontrol of Heat Exchangers." Journal of Heat Transfer 123, no. 3 (January 8, 2001): 556–62. http://dx.doi.org/10.1115/1.1370512.

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This paper investigates the use of adaptive artificial neural networks (ANNs) to control the exit air temperature of a compact heat exchanger. The controllers, based on an internal model control scheme, can be adapted on-line on the basis of different performance criteria. By numerical simulation a methodology by which the weights and biases of the neural network are modified according to these criteria was developed. An ANN controller for an air-water compact heat exchanger in an experimental facility is then implemented. The parameters of the neural net are modified using three criteria: minimization of target error, stabilization of the closed-loop performance of the controller, and minimization of a performance index that we have taken to be the energy consumption. It is shown that the neural network is able to control the air exit temperature in the heat exchanger. The neurocontroller is able to adapt to major structural changes in the system as well as to simultaneously minimize the amount of energy used.
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Brown, Christopher S., Nigel J. Cassidy, Stuart S. Egan, and Dan Griffiths. "Thermal and Economic Analysis of Heat Exchangers as Part of a Geothermal District Heating Scheme in the Cheshire Basin, UK." Energies 15, no. 6 (March 9, 2022): 1983. http://dx.doi.org/10.3390/en15061983.

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Heat exchangers are vital to any geothermal system looking to use direct heat supplied via a district heat network. Attention on geothermal schemes in the UK has been growing, with minimal attention on the performance of heat exchangers. In this study, different types of heat exchangers are analysed for the Cheshire Basin as a case study, specifically the Crewe area, to establish their effectiveness and optimal heat transfer area. The results indicate that counter-current flow heat exchangers have a higher effectiveness than co-current heat exchangers. Optimisation of the heat exchange area can produce total savings of £43.06 million and £71.5 million, over a 25-year lifetime, in comparison with a fossil-fuelled district heat network using geothermal fluid input temperatures of 67 °C and 86 °C, respectively.
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Дисертації з теми "Heat exchangers network"

1

Coetzee, W. A. S. "Steam systems network synthesis using process integration." Pretoria : [s.n.], 2007. http://upetd.up.ac.za/thesis/available/etd-08252008-165312/.

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Viljoen, Johannes Henning. "Dynamic Modelling and Hybrid Non-Linear Model Predictive Control of Induced Draft Cooling Towers With Parallel Heat Exchangers, Pumps and Cooling Water Network." Thesis, University of Pretoria, 2019. http://hdl.handle.net/2263/72415.

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In the process industries, cooling capacity is an important enabler for the facility to manufacture on specification product. The cooling water network is an important part of the over-all cooling system of the facility. In this research a cooling water circuit consisting of 3 cooling towers in parallel, 2 cooling water pumps in parallel, and 11 heat exchangers in parallel, is modelled. The model developed is based on first principles and captures the dynamic, non-linear, interactive nature of the plant. The modelled plant is further complicated by continuous, as well as discrete process variables, giving the model a hybrid nature. Energy consumption is included in the model as it is a very important parameter for plant operation. The model is fitted to real industry data by using a particle swarm optimisation approach. The model is suitable to be used for optimisation and control purposes. Cooling water networks are often not instrumented and actuated, nor controlled or optimised. Significant process benefits can be achieved by better process end-user temperature control, and direct monetary benefits can be obtained from electric power minimisation. A Hybrid Non-Linear Model Predictive Control strategy is developed for these control objectives, and simulated on the developed first principles dynamic model. Continuous and hybrid control cases are developed, and tested on process scenarios that reflect conditions seen in a real plant. Various alternative techniques are evaluated in order to solve the Hybrid Non-Linear Control problem. Gradient descent with momentum is chosen and configured to be used to solve the continuous control problem. For the discrete control problem a graph traversal algorithm is developed and joined to the continuous control algorithm to form a Hybrid Non-Linear Model Predictive controller. The potential monetary benefits that can be obtained by the plant owner through implementing the designed control strategy, are estimated. A powerful computation platform is designed for the plant model and controller simulations.
Thesis (PhD)--University of Pretoria, 2019.
Electrical, Electronic and Computer Engineering
PhD
Unrestricted
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Filho, Luiz Omena de Oliveira. "Uma abordagem matricial para modelagem e simulação de redes de trocadores de calor com aplicações para o gerenciamento da deposição." Universidade do Estado do Rio de Janeiro, 2007. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=7243.

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Uma rede de trocadores de calor pode ser definida como um grupo de trocadores de calor interligados com o objetivo de reduzir a necessidade de energia de um sistema, sendo largamente usada nas indústrias de processos. Entretanto, uma rede está sujeita à deposição, a qual causa um decréscimo na efetividade térmica dos trocadores. Este fenômeno é provocado pelo acúmulo de materiais indesejáveis sobre a superfície de troca térmica. Para compensar a redução de efetividade térmica causada pela deposição, torna-se necessário um aumento no consumo de utilidades. Isto eleva os custos de operação, assim como os custos de manutenção. Estima-se que os custos associados à deposição atinjam bilhões de dólares anualmente. Em face a este problema, vários trabalhos de pesquisa têm investigado métodos para prevenir a deposição e/ou gerenciar as operações em uma rede. Estudos envolvem desde a otimização de trocadores de calor individuais, simulação e monitoramento de redes, até a otimização da programação das paradas para limpeza de trocadores de calor em uma rede. O presente trabalho apresenta a proposição de um modelo para simulação de redes de trocadores de calor com aplicações no gerenciamento da deposição. Como conseqüência, foi desenvolvido um conjunto de códigos computacionais integrados, envolvendo a simulação estacionária de redes, a simulação pseudo-estacionária do comportamento de redes em relação à evolução da deposição, a estimação de parâmetros para diagnóstico do problema da deposição e a otimização operacional deste tipo de sistema. Com relação ao simulador estacionário, o modelo da rede foi formulado matricialmente e os balanços de massa e energia são resolvidos como sistemas de equações lineares. Do ponto de vista da otimização, o procedimento proposto redistribui as vazões, visando um melhor aproveitamento térmico dos trocadores da rede, como, por exemplo, buscando as vazões da rede que maximizem a temperatura da corrente de entrada no forno em unidades de destilação atmosférica de óleo cru. Os algoritmos foram implementados em alguns exemplos da literatura e em um problema de uma refinaria real. Os resultados foram promissores, o que sugere que a proposta deste trabalho pode vir a ser uma abordagem interessante para operações envolvendo redes de trocadores de calor
A Heat Exchanger Network (HEN) can be defined as a group of heat exchangers interconnected aiming to reduce the energy demand of a system, being widely used in the process industries. However, a HEN is subject to fouling, which causes a decrease on the thermal effectiveness of heat exchangers. This phenomenon is provoked by the accumulation of undesirable materials on thermal surface. In order to compensate the reduction of thermal effectiveness caused by fouling, it becomes necessary to increase the utility consumption. Thus, there is an increase of the operation costs, as maintenance costs. It is estimated that the costs associated to fouling reach billions of dollars annually. Facing this problem, several researches have investigated methods to prevent fouling and/or how to manage HEN operations. Studies involve since optimization of individual heat exchangers, simulation and fouling monitoring, until cleaning schedule optimization of HENs. The present work proposes a HEN simulation model, applied to fouling management. Consequently, it was developed a set of integrated computational codes, which involve a HEN stationary simulation, a pseudo-stationary simulation of HEN behavior related to fouling, a parameter estimation procedure for diagnosing fouling problems and an operational optimization procedure of this sort of system. Related to the stationary simulator, the HEN model is formulated using a matrix approach and the mass and energy balances are solved as linear equation systems. Focusing on optimization, it redistributes the HEN flows in order to improve the heat exchangers thermal efficiency, for example, searching for the HEN flows that maximize the inlet furnace stream temperature in crude distillation units. The algorithm was implemented to some literature examples and on a problem of a real refinery. All results show to be promising, which suggests that the proposal of this work may be an interesting approach for operations involving HENs
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Wang, Yufei. "Heat exchanger network retrofit through heat transfer enhancement." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/heat-exchanger-network-retrofit-through-heat-transfer-enhancement(c504dc06-f261-4968-8c58-4f4de153c694).html.

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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 results 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. These problems can be avoided through the use of heat transfer enhancement in heat exchanger network retrofit. This thesis develops a heuristic methodology and an optimization methodology to consider heat transfer enhancement in heat exchanger network retrofit. The heuristic methodology is to identify the most appropriate heat exchangers requiring heat transfer enhancements in the heat exchanger network. From analysis in the heuristic roles, some great physical insights are presented. The optimisation method is based on simulated annealing. It has been developed to find the appropriate heat exchangers to be enhanced and to calculate the level of enhancement required. 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 pay-back time are reduced significantly when only heat transfer enhancement is utilised. Heat transfer enhancement may increase pressure drop in a heat exchanger. The fouling performance in a heat exchanger will also be affected when heat transfer enhancement is used. Therefore, the implications of pressure drop and fouling are assessed in the proposed methodology predicated on heat transfer enhancement. Methods to reduce pressure drop and mitigate fouling are developed to promote the application of heat transfer enhancement in heat exchanger network retrofit. In optimization methodology considering fouling, the dynamic nature of fouling is simulated by using temperature intervals. It can predict fouling performance when heat transfer enhancement is considered in the network. Some models for both heat exchanger and heat transfer enhancement are used to predict the pressure drop performance in heat exchanger network retrofit. Reducing pressure by modifying heat exchanger structure is proposed in this thesis. From case study, the pressure drop increased by heat transfer enhancement can be eliminated by modifying heat exchanger structure.
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Tjoe, T. N. "Retrofit of heat exchanger networks." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376507.

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6

Бухкало, Светлана Ивановна, та Оксана Игоревна Ольховская. "Анализ возможностей комплексных технологий утилизации полимерной части твердых бытовых отходов". Thesis, Московский государственный университет дизайна и технологии, 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/22983.

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Анотація:
Рассмотрены основные системы газификационных агрегатов большой единичной мощности. Выделены основные логистические факторы, влияющие на технологические схемы газификационных агрегатов такие, как природа, качество и состав газифицирующего сырья, номенклатура целевых продуктов, экологические требования по вредным выбросам и эмиссии парниковых газов, местоположение агрегата относительно крупных производственных комплексов, возможности конверсии отходов в полезные продукты.
The basic heat exchangers networks of big gasification plants with entrained-flow fuel gasification are considered. The main logistical factors that influence on process of gasification plants are underlined such fs nature quality and components content of fuel to be gasified, range of target products, environmental legislation and demands including greenhouse gases emission, location relatively to big industrial sites, possibilities of wastes conversion into saleable products.
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O'Young, D. Lionel. "Constrained heat exchanger network : targeting and design." Thesis, University of Manchester, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386405.

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Kotjabasakis, E. "Design of flexible heat exchanger networks." Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235140.

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Анотація:
Design for process flexibility is an industrially important topic so it is not surprising that it is attracting much research work. Given the size of the problem it is also not surprising that workers have concentrated on heat exchanger networks, which can be considered to be a self-contained sub-problem. Unfortunately, recent research has suffered from a number of major drawbacks. Problem formulation has often been unrealistic. Proposed procedures tend to be 'clinical' rather than practical. Academic research has often been conducted without proper consideration of the industrial environment. Very few research results have been tested on full scale industrial problems. In this thesis a new problem formulation and new solution techniques are presented. They have been designed to fulfil the needs of industry. In problem formulation it is recognised that the specification of flexibility is primarily an economic problem. The amount of flexibility industry will demand is a function of how much it costs. The methodology developed here allows both, the flexibility cost and the existing trade-off between flexibility needs, capital costs and energy costs to be fully evaluated. Flexibility problem formulation is mainly based on Multiple Base Cases. Different plant operating scenarios are set and a design found that is able to satisfy each case. This is a formulation that has found a wide acceptance in industry. To be industrially practical, process design techniques must be intelligible to the non-specialist. The techniques developed here are simple and straightforward and give insight. Two new design techniques have been developed. The first of these is 'Downstream Paths'. These are used to identify and evolve the network structures that permit cost effective flexibility. The second technique is 'Sensitivity Tables'. These can be used to analyse the performance of a given structure. In addition they determine the cost effective modification to elements of the structure which provide the specified flexibility needs. The technique is rapid, simple to apply and easy to repeat. Consequently, many scenarios can be screened without much effort and a cost profile developed in order to evaluate the cost trade-off described above. The approach proposed in this thesis, involving the new problem formulation and solution techniques, has been applied to a number of case studies of industrial scale. These case studies have covered problems as diverse as catalyst deactivation, fouling, and plant debottlenecking. One major spin-off from the work is a new approach to the design of heat exchanger networks subjected to fouling. Large potential savings have been identified.
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Zhu, Xin X. "Strategies for optimization in heat exchanger network design /." Title page, contents and summary only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09phz638.pdf.

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Al, Ismaili Riham. "Optimisation of heat exchanger network maintenance scheduling problems." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/280281.

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This thesis focuses on the challenges that arise from the scheduling of heat exchanger network maintenance problems which undergo fouling and run continuously over time. The original contributions of the current research consist of the development of novel optimisation methodologies for the scheduling of cleaning actions in heat exchanger network problems, the application of the novel solution methodology developed to other general maintenance scheduling problems, the development of a stochastic programming formulation using this optimisation technique and its application to these scheduling problems with parametric uncertainty. The work presented in this thesis can be divided into three areas. To efficiently solve this non-convex heat exchanger network maintenance scheduling problem, new optimisation strategies are developed. The resulting contributions are outlined below. In the first area, a novel methodology is developed for the solution of the heat exchanger network maintenance scheduling problems, which is attributed towards a key discovery in which it is observed that these problems exhibit bang-bang behaviour. This indicates that when integrality on the binary decision variables is relaxed, the solution will tend to either the lower or the upper bound specified, obviating the need for integer programming solution techniques. Therefore, these problems are in ac- tuality optimal control problems. To suitably solve these problems, a feasible path sequential mixed integer optimal control approach is proposed. This methodology is coupled with a simple heuristic approach and applied to a range of heat exchanger network case studies from crude oil refinery preheat trains. The demonstrated meth- odology is shown to be robust, reliable and efficient. In the second area of this thesis, the aforementioned novel technique is applied to the scheduling of the regeneration of membranes in reverse osmosis networks which undergo fouling and are located in desalination plants. The results show that the developed solution methodology can be generalised to other maintenance scheduling problems with decaying performance characteristics. In the third and final area of this thesis, a stochastic programming version of the feasible path mixed integer optimal control problem technique is established. This is based upon a multiple scenario approach and is applied to two heat exchanger network case studies of varying size and complexity. Results show that this methodology runs automatically with ease without any failures in convergence. More importantly due to the significant impact on economics, it is vital that uncertainty in data is taken into account in the heat exchanger network maintenance scheduling problem, as well as other general maintenance scheduling problems when there is a level of uncertainty in parameter values.
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Книги з теми "Heat exchangers network"

1

Otar, Cemil. Heat exchanger network optimization. Houston: Gulf Pub. Co., Book Division, 1986.

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2

Zanfir, Monica. Heat transfer enhancement in heat exchangers network retrofit. Manchester: UMIST, 1997.

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Heat exchanger network synthesis: Process optimization by energy and resource analysis. Houston: Gulf Pub., 1995.

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4

Piotrowska, Ewa. Zastępcza sieć cieplna wymiennika ciepła pracującego w stanach przejściowych: The equivalent thermal network for heat exchanger working in the transient states. Warszawa: Wydawnictwo SGGW, 2013.

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5

Mueller, F. U. Optimisation strategies for heat exchanger network synthesis. Manchester: UMIST, 1994.

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6

O'Young, D. L. Constrained heat exchanger network : targeting and design. Manchester: UMIST, 1989.

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7

Ng, Xian Wen. Concise Guide to Heat Exchanger Network Design. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-53498-1.

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8

Morfis, S. Global optimisation for heat exchanger networks. Manchester: UMIST, 1996.

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9

Al-Kawari, M. E. Piping consideration in the heat exchanger network retrofit. Manchester: UMIST, 1997.

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10

Gkivalos, A. Optimal retorfit design of heat exchanger networks. Manchester: UMIST, 1994.

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Частини книг з теми "Heat exchangers network"

1

Mariani, Viviana Cocco, Leandro dos Santos Coelho, Anderson Duck, Fabio Alessandro Guerra, and Ravipudi Venkata Rao. "Artificial Immune Network Approach with Beta Differential Operator Applied to Optimization of Heat Exchangers." In Lecture Notes in Computer Science, 166–77. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33757-4_13.

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Luo, Xing, and Wilfried Roetzel. "C5 Heat Exchanger Networks." In VDI Heat Atlas, 105–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-77877-6_8.

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Ng, Xian Wen. "Fundamentals of Heat Integration." In Concise Guide to Heat Exchanger Network Design, 1–17. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53498-1_1.

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Fryer, Peter. "The Fouling of Heat Exchanger Networks." In Fouling Science and Technology, 511–27. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2813-8_34.

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Fryer, Peter. "Basic Concepts in Heat Exchanger Network Modelling." In Fouling Science and Technology, 495–510. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2813-8_33.

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Jalili-Kharaajoo, Mahdi. "Neural Network Control of Heat Exchanger Plant." In Advances in Neural Networks – ISNN 2005, 137–42. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11427469_21.

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Ng, Xian Wen. "Energy Cascade and Pinch Analysis." In Concise Guide to Heat Exchanger Network Design, 19–62. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53498-1_2.

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Ng, Xian Wen. "Euler’s Theorem and Grand Composite Curves." In Concise Guide to Heat Exchanger Network Design, 63–108. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53498-1_3.

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Ng, Xian Wen. "Complex Hen Design Problems." In Concise Guide to Heat Exchanger Network Design, 109–45. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53498-1_4.

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Leitold, Dániel, Ágnes Vathy-Fogarassy, and János Abonyi. "Application to the Analysis of Heat Exchanger Networks." In Network-Based Analysis of Dynamical Systems, 49–69. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-36472-4_4.

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Тези доповідей конференцій з теми "Heat exchangers network"

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Fakheri, Ahmad, and Alex Leanos. "Optimization of Heat Exchanger Networks." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-65322.

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Анотація:
Various graphical and iterative methods for the optimization of Heat Exchanger Networks (HENs) have been provided. This paper proposes a new alternative approach, based on two ideas. The first is that the optimum solution must be where the efficiencies of the individual heat exchangers are high, and the second idea is that in a heat exchanger network, it is desirable to maximize entropy generation as a result of heat transfer, and minimize entropy generation due to other effects, such as stream mixing. These two ideas provide a simple process for optimizing a network of four heat exchangers, and the concept can potentially be extended to larger systems.
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Fakheri, Ahmad, and Maryam Fazel. "Optimization of Shell and Tube Heat Exchanger Networks." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59513.

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A methodology is presented for the optimization of a network of shell and tube heat exchangers connected in series. For a given total rate of heat transfer and the known inlet and exit temperatures of the hot and cold fluids, the total area of the heat exchanger network is minimized. In the proposed methodology, the heat exchangers are assumed to be different. This is a generalization compared to the traditional approach where all the heat exchangers are taken to have the same area and the same LMTD (Log Mean Temperature Difference) correction factor. In the traditional approach the minimum number of identical shells, for which a feasible solution exists and meets the design criteria, is used as the optimum solution. The proposed optimization approach shows that using larger number of smaller heat exchangers results in less overall heat exchanger area due to the more efficient operation of the individual heat exchangers.
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Jia, Rongguang, and Bengt Sunde´n. "Optimal Design of Compact Heat Exchangers by an Artificial Neural Network Method." In ASME 2003 Heat Transfer Summer Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ht2003-47141.

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The artificial neural network (ANN) methods are introduced (mainly for calculation of thermal and hydraulic coefficients) into a computer-aided design code of compact heat exchangers (CCHE). CCHE integrates the optimization, database, and process drawing into a software package. In the code, a strategy is developed for the optimization of compact heat exchangers (CHEs), which is a problem with changeable objective functions and constraints. However, the applicability and/or accuracy of all these methods are limited by the availability of reliable data sets of the heat transfer coefficients (j or Nu) and friction factors (f ) for different finned geometries. In fact, due to expenses and difficulties in experiments, only a limited number of experiments has been carried out for some kinds of heat transfer surfaces. The information, therefore, is usually given by means of correlations. It is well known, however, that the errors in the predicted results by means of correlations are much larger than the measurement errors, being mainly due to the data reduction represented by them. This implies doubts on the optimal solutions. Fortunately, a well-trained network is capable of correlating the data with errors of the same order as the uncertainty of the measurements. This is the main reason for the present introduction of the ANN method to correlate the discrete experimental data sets into continuous formulas. In this study, the ANN method is used to formulate the complex relationship between the thermal and hydraulic coefficients and the other parameters, including the geometry and process data. A specific case on the optimal analysis of a plate-fin heat exchanger (PFH) is presented to show how the trained ANNs can be used for optimal design of heat exchangers. In addition, a case is presented to illustrate how an inverse heat transfer problem is solved by the optimization methodology developed in the present code.
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Seshadri, P., and Larry C. Witte. "Computer Aided Optimal Design of Heat Exchanger Networks." In ASME 1991 International Computers in Engineering Conference and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/cie1991-0076.

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Abstract A method for finding the best (optimal) operating layout of heat exchangers in complicated thermal networks is developed in this paper. Computer algorithms are developed that take advantage of pinch technology and economic considerations, and exergetic constraints as well as conventional heat and mass balances. Our goals were to achieve minimum loss of exergy between hot and cold streams subject to practical system constraints. Furthermore, resulting networks should be limited to no more units than the theoretical minimum. The ultimate goal was to minimize investment and operating costs for a set of fixed overall system constaints. These goals were realized by developing a computer-based nonlinear multiple objective optimization algorithm that included the elements discussed above. The final solution is a synthesis of the best system using the above-described mathematical formulation. Results for a 4-stream heat exchanger network are presented in terms of the minimum temperature difference at the pinch point. The influence of the minimum temperature difference on capital cost, heat transfer area, exergetic losses and second law efficiency of various heat exchangers in the network is presented.
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Diaz, Gerardo Cristian, Mihir Sen, K. T. Yang, and Rodney L. McClain. "Stabilization of a neural network-based temperature controller for heat exchangers." In International Heat Transfer Conference 12. Connecticut: Begellhouse, 2002. http://dx.doi.org/10.1615/ihtc12.4390.

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Heymann, Douglas B., and Deborah V. Pence. "Modeling Fractal-Like Branching Microchannel Heat Exchangers." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-40722.

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A one-dimensional model for single-phase flow in a fractal-like branching microchannel heat exchanger was developed to estimate bulk fluid temperature and pressure distributions in co-flow and counter-flow configurations. The model assumes incompressible flow with thermally and hydrodynamically developing boundary layers. An existing correlation for the heat transfer coefficient in the simultaneously developing boundary layer region was found to adequately describe results from a three-dimensional computational analysis of conjugate heat transfer and fluid flow using the commercial software package Star-CCM+. Additionally, the fin efficiency was found to be an important descriptor of the difference in performance between a heat exchanger made of low and high thermal conductivity material. A parametric study was performed with the one-dimensional model to assess the influence of flow conditions and flow network characteristics on performance measures, including the benefit-to-cost ratio, which is defined as the heat transfer divided by flow power. Results of heat transfer versus log-mean temperature difference and effectiveness versus number of transfer units are compared between branching and straight microchannel heat exchangers.
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Haynes, Comas, William Rooker, Vaughn Melbourne, and Jeffery Jones. "Analogies Between Fuel Cells and Heat Exchangers: From Phenomena to Design Principles." In ASME 2003 1st International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2003. http://dx.doi.org/10.1115/fuelcell2003-1736.

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Fuel cells and heat exchangers have numerous similarities. Both technologies are used to produce an “energy-in-transit.” Heat exchangers foster thermal transport (heat) as a result of thermal potential differences between streams; fuel cells foster charge transport across electrodes (current leading to power) as a result of electrochemical/electric potential differences between the reactant streams and fuel cell electrodes. Additional analogs include series resistance formulations, active regions for transport phenomena and pertinent capacity rates. These similarities have motivated the extension of heat exchanger design philosophies to fuel cells development. Pilot simulations have been done wherein solid oxide fuel cell geometries and process settings are being optimized via electrochemical pinch points, electroactive area optimization (patterned after optimal area allocation within heat exchangers), electrode “fins” for diminished polarization, and electrochemical multi-staging (motivated by heat exchanger network concepts). The prevailing theme has been to bridge methodologies from the mature field of heat exchanger design to improve fuel cell design practices.
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Abdoli, Abas, and George S. Dulikravich. "Multi-Objective Design Optimization of Multi-Floor, Counterflow Micro Heat Exchangers." In ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ht2013-17738.

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Heat removal capacity, coolant pumping pressure drop and surface temperature non-uniformity are three major challenges facing single-phase flow microchannel compact heat exchangers. In this paper multi-objective optimization has been performed to increase heat removal capacity, and decrease pressure drop and temperature non-uniformity in single-flow microchannels. Three-dimensional (3D) 4-floor branching networks have been applied to increase heat removal capacity of a microchannel from silicon substrate (15×15×2 mm). Each floor has four different branching sub-networks with opposite flow direction with respect to the next one. Each branching network has four inlets and one outlet. However, branching patterns of each of these sub-networks could be different from the others. Conjugate heat transfer analysis has been performed by developing a software package which uses quasi-1D thermo-fluid analysis and a 3D steady heat conduction analysis. These two solvers are coupled through their common boundaries representing surfaces of the cooling microchannels. Using quasi-1D solver significantly decreases computing time and its results are in good agreement with 3D Navier-Stokes equations solver for these types of application. The analysis package is capable of generating 3D branching networks with random topologies. 1341 random cooling networks were simulated using this analysis package. Multi-objective optimization using modeFrontier software was performed using response surface approximation and genetic algorithm. Diameters and branching pattern of each sub-network and coolant flow direction on each floor were design variables of multi-objective optimization. Maximizing heat removal capacity, minimizing pressure drop and temperature non-uniformity on the hot surface were three simultaneous objectives of the optimization. Pareto-optimal solutions demonstrate that thermal loads of up to 500 W/cm2 can be managed with 3D 4-floor microchannel cooling networks.
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Kruger, Jan-Hendrik, Louis A. le Grange, and Gideon P. Greyvenstein. "Integrated Systems CFD Modelling Applied to Diffusion-Bonded Compact Heat Exchangers." In Fourth International Topical Meeting on High Temperature Reactor Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/htr2008-58143.

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Micro-channel heat exchangers consist of a number of plates, each containing fluid channels etched in the surface and diffusion bonded together to create a porous core of metal. The primary and secondary sides of the exchanger are formed by connecting the channels on alternating plates to the respective leader pipes. To analyze the thermal response of exchangers during operation, simulation software is used to create a network of numerical models representing the real-life thermal-hydraulics components. The Systems CFD approach uses one-dimensional empirical models for the fluid flow inside the channels and a three-dimensional model for the heat distribution inside the core. Spatial analysis of the geometry gives a connectivity stencil between the one- and three-dimensional models. This stencil implicitly links the equations of the models at matrix level in the numerical solver, with faster convergence in fewer iterations than when the models are coupled explicitly in different software applications. Results presented show the heat flux through an exchanger core and the fluid flow inside the channels.
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Díaz, Gerardo, Mihir Sen, and Rodney L. McClain. "Adaptive Neurocontrol and Minimization of Energy Consumption of a Heat Exchanger Test Facility." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1468.

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Abstract It has been shown that artificial neural networks (ANNs) can be used to simulate and control thermal systems such as heat exchangers. It is known that the characteristics of thermal components such as heat exchangers vary with respect to time mainly due to fouling effects. There is a need of a model that can adapt to the new characteristics of the thermal system. In this work adaptive artificial neural networks are used to control the outlet air temperature of a heat exchanger test facility. The neurocontrollers are adapted on-line on the basis of different criteria. The parameters of the ANNs are modified considering target error and stability conditions of the closed loop system analyzed as a nonlinear iterative map. We also implement a minimization of a performance index that quantifies the energy consumption. It is shown numerically and experimentally that the neural network is able to control the thermal facility, and is also able to adapt to different disturbances applied to the system, while minimizing the amount of energy used.
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Звіти організацій з теми "Heat exchangers network"

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Johnson, Eric M., and Robert Chew. Social Network Analysis Methods for International Development. RTI Press, May 2021. http://dx.doi.org/10.3768/rtipress.2021.rb.0026.2105.

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Анотація:
Social Network Analysis (SNA) is a promising yet underutilized tool in the international development field. SNA entails collecting and analyzing data to characterize and visualize social networks, where nodes represent network members and edges connecting nodes represent relationships or exchanges among them. SNA can help both researchers and practitioners understand the social, political, and economic relational dynamics at the heart of international development programming. It can inform program design, monitoring, and evaluation to answer questions related to where people get information; with whom goods and services are exchanged; who people value, trust, or respect; who has power and influence and who is excluded; and how these dynamics change over time. This brief advances the case for use of SNA in international development, outlines general approaches, and discusses two recently conducted case studies that illustrate its potential. It concludes with recommendations for how to increase SNA use in international development.
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2

Gölles, Markus, and Viktor Unterberger. Control of large scale solar thermal plants. IEA SHC Task 55, January 2021. http://dx.doi.org/10.18777/ieashc-task55-2021-0003.

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Анотація:
Overview on the control of large-scale thermal plants, limited to plants feeding into DH networks as well as their key components, i.e. the actual collector circuit and the heat exchanger between primary and secondary circuit.
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3

Emelyanov, I. I., and N. N. Ziyatdinov. Interface of computer-aided design of heat exchange networks based on digital models «HEN-Design». OFERNIO, December 2020. http://dx.doi.org/10.12731/ofernio.2020.24737.

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BONNEAU, François, Guillaume CAUMON, Judith SAUSSE, and Philippe RENARD. Genetic-like modeling of fracture network honoring connectivity data in the geothermal heat exchanger at Soultz-sous-Forêt (France). Cogeo@oeaw-giscience, September 2011. http://dx.doi.org/10.5242/iamg.2011.0094.

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Emelyanov, I. I. Method for the synthesis of optimal distributed heat exchange networks of chemical processes based on the superstructure of series-parallel topology. OFERNIO, December 2020. http://dx.doi.org/10.12731/ofernio.2020.24743.

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