®ariability can ha®ea dramatic effect on some process stages particularly sensiti®e ones ) such a... more ®ariability can ha®ea dramatic effect on some process stages particularly sensiti®e ones ) such as crystallization , and it is therefore important to understand how ®ariability in any of the operating ®ariables affects the o®erall process. Ideally, one would like to design processes that are ...
European Journal of Operational Research, Feb 1, 2006
In this paper we present a new modelling approach for realistic simulation of supply-chains. It i... more In this paper we present a new modelling approach for realistic simulation of supply-chains. It is based on an objectoriented architecture, which enables flexible specification of the supply-chain configuration along with its operational decisions and policies.
Please cite this article as: Sheila Samsatli, Nouri J. Samsatli, A general spatio-temporal model ... more Please cite this article as: Sheila Samsatli, Nouri J. Samsatli, A general spatio-temporal model of energy systems with a detailed account of transport and storage, Computers and Chemical Engineering (2015), http://dx.A c c e p t e d M a n u s c r i p t Highlights • Model for energy systems comprising conversion, storage and transport technologies • Optimises type, location, size & number of technologies & transport infrastructures
... SynCity Structure The SynCity tool kit consists of three major components: a series of models... more ... SynCity Structure The SynCity tool kit consists of three major components: a series of models designed to handle specific urban energy design problems, a unifying ontology and database to describe and store core data objects, and an executive to assemble and coordinate the ...
• Whole-system optimisation model for wind-electricity-hydrogen networks • Determines the number,... more • Whole-system optimisation model for wind-electricity-hydrogen networks • Determines the number, size and location of conversion, storage and transport technologies • Electricity versus hydrogen transmission • Determines hourly operation of the whole network over an entire year • Role and value of existing wind turbines, underground storage and hydrogen pipelines Abstract This paper presents the optimal design and operation of integrated wind-hydrogen-electricity networks using the general mixed integer linear programming energy network model, STeMES [1]. The network comprises: 10 wind turbines; electrolysers, fuel cells, compressors and expanders; pressurised vessels and underground storage for hydrogen storage; hydrogen pipelines and electricity overhead/underground transmission lines;
The reduction of CO 2 emissions linked with transport and energy services (heating, domestic hot ... more The reduction of CO 2 emissions linked with transport and energy services (heating, domestic hot water, cooling and electricity), together with the increased use of renewable energies, remains a high priority on various political agendas. In this paper, the trade-offs between the optimal layout of a city in terms of transport and the resulting district energy system are analysed. The starting point of the study is a greenfield site in England, on which a small eco-town, with a pre-defined number of inhabitants, shall be built. Conventional assumptions are made about the number and types of buildings according to the number of inhabitants. A layout model is then used to define the optimal layout of the city to reduce transport requirements. Finally, the optimal mix of technologies that will satisfy the energy services, taking into account spatial and other constraints, is computed using advanced process optimization techniques. The results show how increasing the density of cities to reduce transport energy requirements influences the opportunities offered by certain renewable energy technologies for heat and power services.
Cities account for approximately two-thirds of global primary energy consumption and have large h... more Cities account for approximately two-thirds of global primary energy consumption and have large heat and power demands. Combined heat and power (CHP) systems offer significant efficiency gains and emissions reductions, but they can have high upfront investment costs and create nuisance pollution within the urban environment. Urban planners therefore need to understand the tradeoffs between limitations on CHP plant-size and the performance of the energy system. This paper uses a mixed-integer linear programming model to evaluate energy system designs under a range of scenarios. The results suggest that cost penalties of up to 10% and energy-efficiency penalties of up to 60% may be implied by restrictions on maximum CHP plant size.
Microgrids are defined as an area of electricity distribution network that can operate autonomous... more Microgrids are defined as an area of electricity distribution network that can operate autonomously from the rest of the network. In order to achieve the best economic outcomes, the participants in a microgrid can benefit from cooperation in microgrid design and operation. In this paper, a mathematical programming formulation is presented for fair, optimised cost distribution amongst participants in a general microgrid. The proposed formulation is based on the Game-theory Nash bargaining solution approach for finding optimal multi-partner cost levels subject to given upper bounds on the equivalent annual costs. The microgrid planning problem concerning the fair electricity transfer price and unit capacity selection is first formulated as a mixed integer non-linear programming model. Then, a separable programming approach is applied to reform the resulting mixed integer non-linear programming model to a mixed integer linear programming form. The model is applied to a case study with ...
A comprehensive and flexible toolkit for whole-system biomass value chain optimisation. Determine... more A comprehensive and flexible toolkit for whole-system biomass value chain optimisation. Determines where, when and how bioenergy resources and technologies can be deployed. Based on a spatio-temporal, multi-feedstock, multi-vector modelling framework. BVCM includes more pathways than other biomass supply chain model in the literature. The user-friendly interface enables the definition of a large number of scenarios.
Abstract Micro-cogeneration is a promising technology that has the potential to lower energy cost... more Abstract Micro-cogeneration is a promising technology that has the potential to lower energy costs and CO2 emissions in the residential housing sector. Among the different micro-cogeneration technologies, fuel cells offer the potential benefits of the highest electrical efficiency, lowest emissions, and a heat-to-power ratio that is well suited for residential applications. The design of fuel-cell micro-cogeneration systems involves decision making in which trade-offs are made between conflicting objectives. This paper illustrates the use ...
The most mature technology for CO 2 capture is absorption with suitable solvents, be it physical ... more The most mature technology for CO 2 capture is absorption with suitable solvents, be it physical or chemical. However, important issues still need to be addressed. Two of the most prominent are: a) the large energetic costs involved, and b) the need for capture plants to operate flexibly. Recently, considerable research efforts have been devoted to both the identification of optimal solvents, and the development of improved capture plant process configurations and operating conditions. These two aspects are generally regarded as the main drivers that can bring down the costs associated with solvent-based CO 2 absorption processes. Additionally, an understanding of the dynamic behavior of capture plants is imperative in order to design CCS chains that will be increasingly subjected to variable electricity demand. This work introduces a predictive dynamic modelling framework for solvent-based CO 2 absorption, part of the gCCS system modelling environment for CCS chains. The framework aims to serve as a platform to address the issues abovementioned, among others. Applications to optimization and dynamic studies are presented.
Wiley Interdisciplinary Reviews: Energy and Environment, 2012
Abstract Micro-cogeneration is a promising technology that has the potential to lower energy cost... more Abstract Micro-cogeneration is a promising technology that has the potential to lower energy costs and CO2 emissions in the residential housing sector. Among the different micro-cogeneration technologies, fuel cells offer the potential benefits of the highest electrical efficiency, lowest emissions, and a heat-to-power ratio that is well suited for residential applications. The design of fuel-cell micro-cogeneration systems involves decision making in which trade-offs are made between conflicting objectives. This paper illustrates the use ...
Stock levels of raw materials, intermediates and final products are a key performance measure of ... more Stock levels of raw materials, intermediates and final products are a key performance measure of supply chains. Computer aided tools have helped in trying to understand the movement of stock levels and aid in making decisions that will improve these measures. This work aims to create a tool to help in the analysis and planning of existing systems via a robust planning mechanism and a simulator that incorporates stochastic elements. The tool is based on three main components: a data generator that generates, from historical data, demand forecasts scenarios; a robust planner that generates a plan from a selection of data scenarios; a simulator that puts the robust plan into action with the introduction of random events and a simple form of online scheduling (as a form of feedback control on the system) to examine how the system behaves under such conditions.
ABSTRACT In this paper, we present a new modelling approach for realistic supply chain simulation... more ABSTRACT In this paper, we present a new modelling approach for realistic supply chain simulation. The model provides an experimental environment for informed comparison between different supply chain policies. A basic simulation model for a generic node, from which a supply chain network can be built, has been developed using an object-oriented approach. This generic model allows the incorporation of the information and physical systems and decision-making policies used by each node. The object-oriented approach gives the flexibility in specifying the supply chain configuration and operation decisions, and policies. Stochastic simulations are achieved by applying Latin Supercube Sampling to the uncertain variables in descending order of importance, which reduces the number of simulations required. We also present a case study to show that the model is applicable to a real-life situation for dynamic stochastic studies.Journal of the Operational Research Society (2004) 55, 801–813. doi:10.1057/palgrave.jors.2601740 Published online 14 April 2004
... Pay-per-view customers will be granted access to the datasets corresponding to the articles t... more ... Pay-per-view customers will be granted access to the datasets corresponding to the articles that they have purchased, but they will not be able to search the full database. ... Gjerdrum a b , Nouri J. Samsatli a b , Nilay Shah a b * & Lazaros G. Papageorgiou a c pages 15-36. ...
Design Modelling a b s t r a c t This paper reviews the current state of modelling and optimisati... more Design Modelling a b s t r a c t This paper reviews the current state of modelling and optimisation with regard to fuel cell systems design. The existing models for portable, stationary and transportation fuel cell systems are identified and characterised by approach, state, system boundary, spatial dimension and complexity or detail. The different model-based design approaches such as parametric study, single-objective optimisation and multi-objective optimisation performed using fuel cell system models are summarised. A case study on the design of a fuel cell micro-cogeneration plant is presented to illustrate the use of modelling and optimisation in generating different design alternatives that contain trade-offs between competing objectives.
International Journal of Greenhouse Gas Control, 2013
ABSTRACT A dynamic, non-equilibrium model of a packed column for the chemisorption of CO2 from di... more ABSTRACT A dynamic, non-equilibrium model of a packed column for the chemisorption of CO2 from dilute gas streams using a monoethanolamine solvent has been proposed. The model uses the SAFT-VR equation of state to describe the thermophysical properties and fluid-phase behaviour of this process. The SAFT-VR equation-of-state is used to account for all of the inter-species interactions in the fluid, including the reactions. In this way, we avoid the use of enhancement factors. Further it is not necessary to include a detailed description of the reaction mechanisms or the reaction products. Steady state validation of the proposed model is performed using pilot plant data. The position and extent of the mass transfer zone is found to be a function of competing interphase fluxes of H2O and CO2. We evaluate through dynamic simulation the effect of changing the lean solvent flowrate and thermodynamic state on column behaviour. The influence of flue gas humidity on the position and shape of the mass transfer zone is also highlighted and discussed.
®ariability can ha®ea dramatic effect on some process stages particularly sensiti®e ones ) such a... more ®ariability can ha®ea dramatic effect on some process stages particularly sensiti®e ones ) such as crystallization , and it is therefore important to understand how ®ariability in any of the operating ®ariables affects the o®erall process. Ideally, one would like to design processes that are ...
European Journal of Operational Research, Feb 1, 2006
In this paper we present a new modelling approach for realistic simulation of supply-chains. It i... more In this paper we present a new modelling approach for realistic simulation of supply-chains. It is based on an objectoriented architecture, which enables flexible specification of the supply-chain configuration along with its operational decisions and policies.
Please cite this article as: Sheila Samsatli, Nouri J. Samsatli, A general spatio-temporal model ... more Please cite this article as: Sheila Samsatli, Nouri J. Samsatli, A general spatio-temporal model of energy systems with a detailed account of transport and storage, Computers and Chemical Engineering (2015), http://dx.A c c e p t e d M a n u s c r i p t Highlights • Model for energy systems comprising conversion, storage and transport technologies • Optimises type, location, size & number of technologies & transport infrastructures
... SynCity Structure The SynCity tool kit consists of three major components: a series of models... more ... SynCity Structure The SynCity tool kit consists of three major components: a series of models designed to handle specific urban energy design problems, a unifying ontology and database to describe and store core data objects, and an executive to assemble and coordinate the ...
• Whole-system optimisation model for wind-electricity-hydrogen networks • Determines the number,... more • Whole-system optimisation model for wind-electricity-hydrogen networks • Determines the number, size and location of conversion, storage and transport technologies • Electricity versus hydrogen transmission • Determines hourly operation of the whole network over an entire year • Role and value of existing wind turbines, underground storage and hydrogen pipelines Abstract This paper presents the optimal design and operation of integrated wind-hydrogen-electricity networks using the general mixed integer linear programming energy network model, STeMES [1]. The network comprises: 10 wind turbines; electrolysers, fuel cells, compressors and expanders; pressurised vessels and underground storage for hydrogen storage; hydrogen pipelines and electricity overhead/underground transmission lines;
The reduction of CO 2 emissions linked with transport and energy services (heating, domestic hot ... more The reduction of CO 2 emissions linked with transport and energy services (heating, domestic hot water, cooling and electricity), together with the increased use of renewable energies, remains a high priority on various political agendas. In this paper, the trade-offs between the optimal layout of a city in terms of transport and the resulting district energy system are analysed. The starting point of the study is a greenfield site in England, on which a small eco-town, with a pre-defined number of inhabitants, shall be built. Conventional assumptions are made about the number and types of buildings according to the number of inhabitants. A layout model is then used to define the optimal layout of the city to reduce transport requirements. Finally, the optimal mix of technologies that will satisfy the energy services, taking into account spatial and other constraints, is computed using advanced process optimization techniques. The results show how increasing the density of cities to reduce transport energy requirements influences the opportunities offered by certain renewable energy technologies for heat and power services.
Cities account for approximately two-thirds of global primary energy consumption and have large h... more Cities account for approximately two-thirds of global primary energy consumption and have large heat and power demands. Combined heat and power (CHP) systems offer significant efficiency gains and emissions reductions, but they can have high upfront investment costs and create nuisance pollution within the urban environment. Urban planners therefore need to understand the tradeoffs between limitations on CHP plant-size and the performance of the energy system. This paper uses a mixed-integer linear programming model to evaluate energy system designs under a range of scenarios. The results suggest that cost penalties of up to 10% and energy-efficiency penalties of up to 60% may be implied by restrictions on maximum CHP plant size.
Microgrids are defined as an area of electricity distribution network that can operate autonomous... more Microgrids are defined as an area of electricity distribution network that can operate autonomously from the rest of the network. In order to achieve the best economic outcomes, the participants in a microgrid can benefit from cooperation in microgrid design and operation. In this paper, a mathematical programming formulation is presented for fair, optimised cost distribution amongst participants in a general microgrid. The proposed formulation is based on the Game-theory Nash bargaining solution approach for finding optimal multi-partner cost levels subject to given upper bounds on the equivalent annual costs. The microgrid planning problem concerning the fair electricity transfer price and unit capacity selection is first formulated as a mixed integer non-linear programming model. Then, a separable programming approach is applied to reform the resulting mixed integer non-linear programming model to a mixed integer linear programming form. The model is applied to a case study with ...
A comprehensive and flexible toolkit for whole-system biomass value chain optimisation. Determine... more A comprehensive and flexible toolkit for whole-system biomass value chain optimisation. Determines where, when and how bioenergy resources and technologies can be deployed. Based on a spatio-temporal, multi-feedstock, multi-vector modelling framework. BVCM includes more pathways than other biomass supply chain model in the literature. The user-friendly interface enables the definition of a large number of scenarios.
Abstract Micro-cogeneration is a promising technology that has the potential to lower energy cost... more Abstract Micro-cogeneration is a promising technology that has the potential to lower energy costs and CO2 emissions in the residential housing sector. Among the different micro-cogeneration technologies, fuel cells offer the potential benefits of the highest electrical efficiency, lowest emissions, and a heat-to-power ratio that is well suited for residential applications. The design of fuel-cell micro-cogeneration systems involves decision making in which trade-offs are made between conflicting objectives. This paper illustrates the use ...
The most mature technology for CO 2 capture is absorption with suitable solvents, be it physical ... more The most mature technology for CO 2 capture is absorption with suitable solvents, be it physical or chemical. However, important issues still need to be addressed. Two of the most prominent are: a) the large energetic costs involved, and b) the need for capture plants to operate flexibly. Recently, considerable research efforts have been devoted to both the identification of optimal solvents, and the development of improved capture plant process configurations and operating conditions. These two aspects are generally regarded as the main drivers that can bring down the costs associated with solvent-based CO 2 absorption processes. Additionally, an understanding of the dynamic behavior of capture plants is imperative in order to design CCS chains that will be increasingly subjected to variable electricity demand. This work introduces a predictive dynamic modelling framework for solvent-based CO 2 absorption, part of the gCCS system modelling environment for CCS chains. The framework aims to serve as a platform to address the issues abovementioned, among others. Applications to optimization and dynamic studies are presented.
Wiley Interdisciplinary Reviews: Energy and Environment, 2012
Abstract Micro-cogeneration is a promising technology that has the potential to lower energy cost... more Abstract Micro-cogeneration is a promising technology that has the potential to lower energy costs and CO2 emissions in the residential housing sector. Among the different micro-cogeneration technologies, fuel cells offer the potential benefits of the highest electrical efficiency, lowest emissions, and a heat-to-power ratio that is well suited for residential applications. The design of fuel-cell micro-cogeneration systems involves decision making in which trade-offs are made between conflicting objectives. This paper illustrates the use ...
Stock levels of raw materials, intermediates and final products are a key performance measure of ... more Stock levels of raw materials, intermediates and final products are a key performance measure of supply chains. Computer aided tools have helped in trying to understand the movement of stock levels and aid in making decisions that will improve these measures. This work aims to create a tool to help in the analysis and planning of existing systems via a robust planning mechanism and a simulator that incorporates stochastic elements. The tool is based on three main components: a data generator that generates, from historical data, demand forecasts scenarios; a robust planner that generates a plan from a selection of data scenarios; a simulator that puts the robust plan into action with the introduction of random events and a simple form of online scheduling (as a form of feedback control on the system) to examine how the system behaves under such conditions.
ABSTRACT In this paper, we present a new modelling approach for realistic supply chain simulation... more ABSTRACT In this paper, we present a new modelling approach for realistic supply chain simulation. The model provides an experimental environment for informed comparison between different supply chain policies. A basic simulation model for a generic node, from which a supply chain network can be built, has been developed using an object-oriented approach. This generic model allows the incorporation of the information and physical systems and decision-making policies used by each node. The object-oriented approach gives the flexibility in specifying the supply chain configuration and operation decisions, and policies. Stochastic simulations are achieved by applying Latin Supercube Sampling to the uncertain variables in descending order of importance, which reduces the number of simulations required. We also present a case study to show that the model is applicable to a real-life situation for dynamic stochastic studies.Journal of the Operational Research Society (2004) 55, 801–813. doi:10.1057/palgrave.jors.2601740 Published online 14 April 2004
... Pay-per-view customers will be granted access to the datasets corresponding to the articles t... more ... Pay-per-view customers will be granted access to the datasets corresponding to the articles that they have purchased, but they will not be able to search the full database. ... Gjerdrum a b , Nouri J. Samsatli a b , Nilay Shah a b * & Lazaros G. Papageorgiou a c pages 15-36. ...
Design Modelling a b s t r a c t This paper reviews the current state of modelling and optimisati... more Design Modelling a b s t r a c t This paper reviews the current state of modelling and optimisation with regard to fuel cell systems design. The existing models for portable, stationary and transportation fuel cell systems are identified and characterised by approach, state, system boundary, spatial dimension and complexity or detail. The different model-based design approaches such as parametric study, single-objective optimisation and multi-objective optimisation performed using fuel cell system models are summarised. A case study on the design of a fuel cell micro-cogeneration plant is presented to illustrate the use of modelling and optimisation in generating different design alternatives that contain trade-offs between competing objectives.
International Journal of Greenhouse Gas Control, 2013
ABSTRACT A dynamic, non-equilibrium model of a packed column for the chemisorption of CO2 from di... more ABSTRACT A dynamic, non-equilibrium model of a packed column for the chemisorption of CO2 from dilute gas streams using a monoethanolamine solvent has been proposed. The model uses the SAFT-VR equation of state to describe the thermophysical properties and fluid-phase behaviour of this process. The SAFT-VR equation-of-state is used to account for all of the inter-species interactions in the fluid, including the reactions. In this way, we avoid the use of enhancement factors. Further it is not necessary to include a detailed description of the reaction mechanisms or the reaction products. Steady state validation of the proposed model is performed using pilot plant data. The position and extent of the mass transfer zone is found to be a function of competing interphase fluxes of H2O and CO2. We evaluate through dynamic simulation the effect of changing the lean solvent flowrate and thermodynamic state on column behaviour. The influence of flue gas humidity on the position and shape of the mass transfer zone is also highlighted and discussed.
Uploads
Papers by Nouri Samsatli