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Multi criteria dynamic design optimization of a small scale distributed energy system

ENERGY 2014年第0期74卷 230-239页

作者： Rieder, Andreas Christidis, Andreas Tsatsaronis, George Karlsruhe Inst Technol Inst Technol Assessment & Syst Anal D-76344 Eggenstein Leopoldshafen Germany Tech Univ Berlin Inst Energy Engn D-10587 Berlin Germany

The aim of this paper is to analyze the mutual interdependencies and trade-offs between heat storage and district heating network considering economic and ecological aspects. Therefore, a MILP (mixed integer linear programming) problem of a distributed energy system is formulated with a weighted multi-criteria objective function including profit and operational CO2 emissions. The considered components include CHP (combined heat and power) units of three different types, a thermal storage facility, a boiler, and district heating pipelines. In a single optimization step placement, quantity and capacity of all components as well as their operation is determined. The computed designs as well as the operation of the energy system are compared under varying weightings and different technology scenarios. We also conduct a sensitivity analysis of the investment costs associated with heat storage and of the piping costs for the district heating network. The results favor the construction of heat storage devices over a district heating network. This applies to both environmental impact and cost of energy supply and can be well explained by the decoupling of heat demand and electricity production, which is shown in a correlation analysis. (C) 2014 Elsevier Ltd. All rights reserved.

关键词： Combined heat and power Thermal storage Distributed energy systems Design optimization mixed integer linear programming

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A mixed integer linear programming for medical waste reverse logistics network design

A mixed integer linear programming for medical waste reverse...

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International Conference on Management Science and Engineering (ICMSE)

作者： Li-hong Shi Transportation Management College Dalian Maritime University China

The medical waste management is of great importance due to its potential environmental hazards and public health risks. Manufacturers have to collect the medical waste and control its recovery or disposal. Medical waste recovery, which encompasses reuse, remanufacturing and materials recycling, requires a specially structured reverse logistic network in order to collect medical waste efficiently. This paper has attempted to apply the basic theories of reverse logistics to improve the effect of medical waste management. We presents a mixed integer linear programming model of reverse logistics networks for returned medical waste. The efficiency and practicability of the proposed model is validated by an application to an illustrative example dealing with medical waste returned from some hospitals to a given medical materials producer.

关键词： mixed integer linear programming Reverse logistics Waste management Waste materials Hazards Public healthcare Manufacturing Waste recovery Recycling Hospitals

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Capacity planning for batch and perfusion bioprocesses across multiple biopharmaceutical facilities

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BIOTECHNOLOGY PROGRESS 2014年第3期30卷 594-606页

作者： Siganporia, Cyrus C. Ghosh, Soumitra Daszkowski, Thomas Papageorgiou, Lazaros G. Farid, Suzanne S. UCL Dept Biochem Engn London WC1E 7JE England Bayer Healthcare Biotechnol Controlling Berkeley CA USA Bayer AG Proc Dev & Optimisat Leverkusen Germany UCL Ctr Proc Syst Engn Dept Chem Engn London WC1E 7JE England

Production planning for biopharmaceutical portfolios becomes more complex when products switch between fed-batch and continuous perfusion culture processes. This article describes the development of a discrete-time mixed integer linear programming (MILP) model to optimize capacity plans for multiple biopharmaceutical products, with either batch or perfusion bioprocesses, across multiple facilities to meet quarterly demands. The model comprised specific features to account for products with fed-batch or perfusion culture processes such as sequence-dependent changeover times, continuous culture constraints, and decoupled upstream and downstream operations that permit independent scheduling of each. Strategic inventory levels were accounted for by applying cost penalties when they were not met. A rolling time horizon methodology was utilized in conjunction with the MILP model and was shown to obtain solutions with greater optimality in less computational time than the full-scale model. The model was applied to an industrial case study to illustrate how the framework aids decisions regarding outsourcing capacity to third party manufacturers or building new facilities. The impact of variations on key parameters such as demand or titres on the optimal production plans and costs was captured. The analysis identified the critical ratio of in-house to contract manufacturing organization (CMO) manufacturing costs that led the optimization results to favor building a future facility over using a CMO. The tool predicted that if titres were higher than expected then the optimal solution would allocate more production to in-house facilities, where manufacturing costs were lower. Utilization graphs indicated when capacity expansion should be considered. (c) 2013 The Authors Biotechnology Progress published by Wiley Periodicals, Inc. on behalf of American Institute of Chemical Engineers Biotechnol. Prog., 30:594-606, 2014

关键词： capacity planning scheduling business decision-making mixed integer linear programming rolling time horizon

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Multiobjective Optimization of Utility Plants under Several Environmental Indicators Using an MILP-Based Dimensionality Reduction Approach

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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 2014年第50期53卷 19559-19572页

作者： Vaskan, P. Guillen-Gosalbez, G. Turkay, M. Jimenez, L. Univ Rovira & Virgili Dept Engn Quim EQ ETSEQ E-43007 Tarragona Spain Ecole Polytech Fed Lausanne Bioenergy & Energy Planning Res Grp GR GN INTERENAC CH-1015 Lausanne Switzerland Univ Manchester Ctr Proc Integrat Sch Chem Engn & Analyt Sci Manchester M13 9PL Lancs England Koc Univ Dept Ind Engn TR-34450 Istanbul Turkey

We address the multicriterion optimization of utility plants with economic and environmental concerns. Rather than optimizing a single environmental metric, which was the traditional approach followed in the past, we focus on optimizing these systems considering simultaneously several environmental indicators based on life cycle assessment (LCA) principles. We combine a multiobjective optimization model with an MILP-based dimensionality reduction method that allows identifying key environmental metrics that exhibit the property that their optimization will very likely improve the system simultaneously in all of the remaining damage categories. This analysis reduces the complexity of the underlying multiobjective optimization problem from the viewpoints of generation and interpretation of the solutions. The capabilities of the proposed method are illustrated through a case study based on a real industrial scenario, in which we show that a small number of environmental indicators suffice to optimize the environmental performance of the plant.

关键词： PLANT life cycles ENVIRONMENTAL indicators DIMENSION reduction (Statistics) mixed integer linear programming STRUCTURAL optimization PERFORMANCE evaluation

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Minimal counterexamples for linear-time probabilistic verification

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THEORETICAL COMPUTER SCIENCE 2014年第C期549卷 61-100页

作者： Wimmer, Ralf Jansen, Nils Abraham, Erika Katoen, Joost-Pieter Becker, Bernd Univ Freiburg Chair Comp Architecture D-79110 Freiburg Germany Rhein Westfal TH Aachen Chairfor Software Modeling & Verificat Aachen Germany Rhein Westfal TH Aachen Aachen Germany

Counterexamples for property violations have a number of important applications like supporting the debugging of erroneous systems and verifying large systems via counterexample-guided abstraction refinement. In this paper, we propose the usage of minimal critical subsystems of discrete-time Markov chains and Markov decision processes as counterexamples for violated omega-regular properties. Minimality can thereby be defined in terms of the number of states or transitions. This problem is known to be NP-complete for Markov decision processes. We show how to compute such subsystems using mixed integer linear programming and evaluate the practical applicability in a number of experiments. They show that our method yields substantially smaller counterexample than using existing techniques. (C) 2014 Elsevier B.V. All rights reserved.

关键词： Markov chain Markov decision process Counterexample omega-Regular property mixed integer linear programming SAT-modulo-theories

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Simultaneous Optimization of the Complex Fractionator and Heat Exchanger Network Considering the Constraints of Variable Heat Removals in Delayed Coking Units

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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 2014年第33期53卷 13073-13086页

作者： Lei, Y. Qi, X. Zhang, B. J. Chen, Q. L. Hui, C. W. Sun Yat Sen Univ Sch Chem & Chem Engn Key Lab Low Carbon Chem & Energy Conservat Guangd Guangzhou 510275 Guangdong Peoples R China Hong Kong Univ Sci & Technol Dept Chem & Biomol Engn Kowloon Hong Kong Peoples R China

Heat exchanger networks in process plants recover usable heat from hot to cold process streams such as feedstock, product, and pumparound streams. In this paper, we focus on the design of a heat exchanger network for removing variable heat from a complex fractionator in delayed coking units. A superstructure-based mixed integer nonlinear programming model is presented to minimize the total annual cost, including the heat exchanger area cost and the utility cost. In the proposed model, duties and operating parameters of pumparounds are optimized and the optimized structure of the heat exchanger network is defined simultaneously. Meanwhile, two modifications are applied to improve the simultaneous optimization model for the integrated system of the complex fractionator and heat exchanger network. First, a predominant calculation method for the log mean temperature difference is introduced in order to obtain the results closest to the actual process;second, nonconstant specific heat of process streams with pseudocomponents is considered to represent real thermal properties of process streams in the process model. A case study is carried out to demonstrate simultaneous optimization of the fractionator and heat exchanger network. The optimal design for the model is compared to the one with conventional design heuristics. By applying the proposed model to integrate the operation of the fractionator and heat exchanger network in a delayed coking unit, the total annual cost is reduced by 2.1 million CNY considering the constraints of the heat removals.

关键词： HEAT exchangers CONSTRAINTS (Physics) COAL -- Carbonization mixed integer linear programming COMPLEX compounds THERMAL analysis MATHEMATICAL optimization

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The train platforming problem: The infrastructure management company perspective

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TRANSPORTATION RESEARCH PART B-METHODOLOGICAL 2014年 61卷 55-72页

作者： Sels, P. Vansteenwegen, P. Dewilde, T. Cattrysse, D. Waquet, B. Joubert, A. Katholieke Univ Leuven Ctr Ind Management Traff & Infrastruct B-3001 Heverlee Belgium Log Yours BVBA B-2100 Antwerp Belgium Infrabel Dept Rail Access B-1070 Brussels Belgium ICTRA B-1070 Brussels Belgium

If railway companies ask for station capacity numbers, their underlying question is in fact one about the platformability of extra trains. Train platformability depends not only on the infrastructure, buffer times, and the desired departure and arrival times of the trains, but also on route durations, which depend on train speeds and lengths, as well as on conflicts between routes at any given time. We consider all these factors in this paper. We assume a current train set and a future one, where the second is based on the expected traffic increase through the station considered. The platforming problem is about assigning a platform to each train, together with suitable in-and out-routes. Route choices lead to different route durations and imply different in-route-begin and out-route-end times. Our module platforms the maximum possible weighted sum of trains in the current and future train set. The resulting number of trains can be seen as the realistic capacity consumption of the schedule. Our goal function allows for current trains to be preferably allocated to their current platforms. Our module is able to deal with real stations and train sets in a few seconds and has been fully integrated by Infrabel, the Belgian Infrastructure Management Company, in their application called Ocapi, which is now used to platform existing and projected train sets and to determine the capacity consumption. (C) 2014 Elsevier Ltd. All rights reserved.

关键词： Train platforming problem mixed integer linear programming Train station capacity

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Composite generation and transmission expansion planning considering distributed generation

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INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS 2014年 62卷 792-805页

作者： Rouhani, Ahmad Hosseini, Seyyed Hadi Raoofat, Mahdi Islamic Azad Univ Beyza Branch Young Researchers & Elite Club Beyza Iran Zanjan Univ Dept Elect Engn Zanjan Iran Shiraz Univ Sch Elect & Comp Engn Dept Power & Control Engn Shiraz Iran

This paper presents a model for use in the problem of composite generation and transmission expansion planning considering distributed generation. Generation expansion planning is defined as the problem of determining what capacity, which, and when new generating units should be constructed over a long range planning horizon, to satisfy the expected energy demand using single nodal generation planning model. Then, the place of every planned generating units and distributed generation is determined simultaneous with transmission expansion planning considering nonuniform geographical fuel supply cost and potential of distributed generation technology. The problem is formulated as a mixed-integer linear programming. By allocating the overall generation capacity among the grid nodes and determining the new transmission element additions along the planning horizon, the overall cost of the system is minimized. To assess the capabilities of the proposed approach, the Iranian Power Grid as a large scale system is considered. The effectiveness of the proposed modifications is illustrated in detail. (C) 2014 Elsevier Ltd. All rights reserved.

关键词： Composite expansion planning Distributed generation Generation expansion planning mixed integer linear programming Transmission expansion planning

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Models and strategies for efficiently determining an optimal vertical alignment of roads

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COMPUTERS & OPERATIONS RESEARCH 2014年第Apr.期44卷 161-173页

作者： Hare, Warren Hossain, Shahadat Lucet, Yves Rahman, Faisal Univ British Columbia Kelowna BC Canada Softree Tech Syst Inc Vancouver BC Canada

Selecting an optimal vertical alignment while satisfying safety and design constraints is an important task during road construction. The amount of earthwork operations depends on the design of the vertical alignment, so a good vertical alignment can have a profound impact on final construction costs. In this research, we improve the performance of a previous mixed-integer linear programming model, and we propose a new quasi-network flow model. Both models use a piecewise quadratic curve to compute the minimum cost vertical alignment and take earthwork operations into account. The models consider several features such as side-slopes, and physical blocks in the terrain. In addition to improving the precision, we propose several techniques that speed up the search for a solution, so that it is possible to make interactive design tools. We report numerical tests that validate the accuracy of the models, and reduce the calculation time. (C) 2013 Elsevier Ltd. All rights reserved.

关键词： Road design Highway alignment optimization Vertical alignment mixed integer linear programming

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Effective Real-Time Unmanned Air Vehicle Path Planning in Presence of Threat Netting

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JOURNAL OF AEROSPACE INFORMATION SYSTEMS 2014年第4期11卷 170-177页

作者： Fu Xiaowei Gao Xiaoguang Northwestern Polytech Univ Xian 710072 Shaanxi Peoples R China

A method of real-time path planning for unmanned air vehicles in a radar-guided surface-to-air missile (SAM) netting environment was proposed. First, a simplified threat netting model is established based on the probability of an UAV being detected by threats;then, the model of threat netting is integrated with models of SAMs. The first step in the path planning algorithm based on MPC is to construct a UAV state-space model. In the threat netting situation, a SAM may receive target information from other SAMs via a communication network. The completeness of transmitted information depends on the connective probability of the communication network, which depends on the network topology and capacity. The path planning problem is formulated as a model predictive control problem. Simulation results and the present analysis indicate that the presented threat netting model and path planning algorithm can compensate for the increase in the lethality of a particular threat.

关键词： Real Time Path Planning Flight Vehicle Radar Cross Sections Surface to Air Missile Precision Guided Munition Bank Angle Aircraft Dynamics mixed integer linear programming Combat Air Vehicle Optimal Control

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