The Experts below are selected from a list of 129372 Experts worldwide ranked by ideXlab platform
Vasilios I Manousiouthakis - One of the best experts on this subject based on the ideXlab platform.
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total annualized cost optimality properties of state space models for mass and heat Exchanger Networks
Chemical Engineering Science, 2001Co-Authors: Lealon L Martin, Vasilios I ManousiouthakisAbstract:In this work, we employ a state space representation of a heat/mass Exchanger Network to derive a mathematical formulation of the minimum total annualized cost (TAC) problem. Mathematical properties of the resulting nonlinear program's global optimum are then derived, using a variation induced minimization (VIM) technique and control theoretic concepts. This technique successfully identifies variables which are zero at the global optimum, thus reducing the size of the optimization problem. It is established that, under certain conditions, all self-recycle and total Network bypass flow rates can be chosen to be zero at the TAC minimum. Two heat Exchange Network (HEN) TAC synthesis problems are employed to illustrate the validity of these properties, as well as the importance of the conditions under which the properties are derived. A hybrid algorithm, which consists of branch and bound underestimation with imbedded interval analysis, is employed in identifying numerically the optimum of these HEN TAC problems.
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on the state space approach to mass heat Exchanger Network design
Chemical Engineering Science, 1998Co-Authors: Miguel J Bagajewicz, Robert Pham, Vasilios I ManousiouthakisAbstract:In this paper, the conceptual framework and applications of the State Space Approach to Process Synthesis are presented. It is shown that the State Space Approach contains the concept of a Network Superstructure as a special case. Additionally, through various operators, it is shown to provide increased flexibility in formulating process Network synthesis problems. As an example, it is demonstrated that an Assignment Operator can be used to facilitate the solution of large-scale problems. Pinch Operators are also employed in solving combined heat and mass Exchange Network synthesis problems. To demonstrate the usefulness of this new approach, two important problems are discussed. First, a one-step procedure is developed that minimizes the total annualized cost (TAC) of heat/mass Exchange Networks. Next, a novel problem, namely the pinch-based calculation of Minimum Utility Cost for a separable heat and mass Exchange Network, is solved.
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On the state space approach to mass/heat Exchanger Network design*
Chemical Engineering Science, 1998Co-Authors: Miguel J Bagajewicz, Robert Pham, Vasilios I ManousiouthakisAbstract:In this paper, the conceptual framework and applications of the State Space Approach to Process Synthesis are presented. It is shown that the State Space Approach contains the concept of a Network Superstructure as a special case. Additionally, through various operators, it is shown to provide increased flexibility in formulating process Network synthesis problems. As an example, it is demonstrated that an Assignment Operator can be used to facilitate the solution of large-scale problems. Pinch Operators are also employed in solving combined heat and mass Exchange Network synthesis problems. To demonstrate the usefulness of this new approach, two important problems are discussed. First, a one-step procedure is developed that minimizes the total annualized cost (TAC) of heat/mass Exchange Networks. Next, a novel problem, namely the pinch-based calculation of Minimum Utility Cost for a separable heat and mass Exchange Network, is solved.
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Mass/heat‐Exchange Network representation of distillation Networks
AIChE Journal, 1992Co-Authors: Miguel J Bagajewicz, Vasilios I ManousiouthakisAbstract:This article introduces the “state space” conceptual framework to process synthesis, which is used to provide a novel representation of a distillation Network as a composite heat- and mass-Exchange Network. This representation suggests that distillation Network synthesis may best be viewed as an interacting heat- and mass-Exchange Network synthesis problem. In that regard, familiar tools (such as pinch diagrams) from both heat-Exchange Network (HEN) and mass-Exchange Network (MEN) synthesis are shown to be of use in arriving at energy-efficient distillation Network designs. Examples of propylene-propane and solvent-water separations are used to illustrate the proposed conceptual framework.
Miguel J Bagajewicz - One of the best experts on this subject based on the ideXlab platform.
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on the state space approach to mass heat Exchanger Network design
Chemical Engineering Science, 1998Co-Authors: Miguel J Bagajewicz, Robert Pham, Vasilios I ManousiouthakisAbstract:In this paper, the conceptual framework and applications of the State Space Approach to Process Synthesis are presented. It is shown that the State Space Approach contains the concept of a Network Superstructure as a special case. Additionally, through various operators, it is shown to provide increased flexibility in formulating process Network synthesis problems. As an example, it is demonstrated that an Assignment Operator can be used to facilitate the solution of large-scale problems. Pinch Operators are also employed in solving combined heat and mass Exchange Network synthesis problems. To demonstrate the usefulness of this new approach, two important problems are discussed. First, a one-step procedure is developed that minimizes the total annualized cost (TAC) of heat/mass Exchange Networks. Next, a novel problem, namely the pinch-based calculation of Minimum Utility Cost for a separable heat and mass Exchange Network, is solved.
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On the state space approach to mass/heat Exchanger Network design*
Chemical Engineering Science, 1998Co-Authors: Miguel J Bagajewicz, Robert Pham, Vasilios I ManousiouthakisAbstract:In this paper, the conceptual framework and applications of the State Space Approach to Process Synthesis are presented. It is shown that the State Space Approach contains the concept of a Network Superstructure as a special case. Additionally, through various operators, it is shown to provide increased flexibility in formulating process Network synthesis problems. As an example, it is demonstrated that an Assignment Operator can be used to facilitate the solution of large-scale problems. Pinch Operators are also employed in solving combined heat and mass Exchange Network synthesis problems. To demonstrate the usefulness of this new approach, two important problems are discussed. First, a one-step procedure is developed that minimizes the total annualized cost (TAC) of heat/mass Exchange Networks. Next, a novel problem, namely the pinch-based calculation of Minimum Utility Cost for a separable heat and mass Exchange Network, is solved.
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Mass/heat‐Exchange Network representation of distillation Networks
AIChE Journal, 1992Co-Authors: Miguel J Bagajewicz, Vasilios I ManousiouthakisAbstract:This article introduces the “state space” conceptual framework to process synthesis, which is used to provide a novel representation of a distillation Network as a composite heat- and mass-Exchange Network. This representation suggests that distillation Network synthesis may best be viewed as an interacting heat- and mass-Exchange Network synthesis problem. In that regard, familiar tools (such as pinch diagrams) from both heat-Exchange Network (HEN) and mass-Exchange Network (MEN) synthesis are shown to be of use in arriving at energy-efficient distillation Network designs. Examples of propylene-propane and solvent-water separations are used to illustrate the proposed conceptual framework.
K. Watson - One of the best experts on this subject based on the ideXlab platform.
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ICPP (1) - On the Rearrangeability of Reverse Shuffle/Exchange Networks
1994 International Conference on Parallel Processing (ICPP'94), 1994Co-Authors: B. Park, K. WatsonAbstract:This paper proposes a new rearrangeable algorithm in a multistage reverse shuffle/Exchange Network. Currently, the best upper bound for the rearrangeability of a shuffle/Exchange Network in nonsymmetric Networks is 3logN-3 stages. We describe the rearrangeability of reverse shuffle/Exchange multistage interconnection Network on every arbitrary permutation with N\leqslant16. It can be established by setting two more stages in the middle stage of the Network to allow the reduced Network to be topological equivalent to a class of rearrangeable Networks. The results enable us to establish an upper bound, 2logN+l stages for reverse shuffle/Exchange Network with N\leqslant16, and leads to the possibility of this bound when N\ge16.
A Floudas - One of the best experts on this subject based on the ideXlab platform.
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mass Exchange Networks for waste minimization a simultaneous approach process design
Chemical Engineering Research & Design, 1994Co-Authors: K P Papalexandri, E N Pistikopoulos, A FloudasAbstract:The synthesis problem of mass-Exchange Networks is addressed, where a number of process streams, rich in terms of certain components (typically pollutants) are integrated with lean process or utility streams in order to meet process specifications (e.g. environmental regulations) on their final compositions. A mathematical programming approach is adopted, based on a hyperstructure representation of the mass Exchange Network. The synthesis problem is then formulated as a mixed integer nonlinear programming optimization problem (MINLP), where both Network operating and investment cost are optimized simultaneously. In contrast to all previously published work that simplifies the problem by assuming decomposition based on the concept of pinch, we treat the synthesis of mass Exchange Networks without decomposition. In the first part, the case of a single component is examined, whereas mass Exchange in multiple components can be handled in a straightforward manner. In the second part the approach is applied to reactive mass Exchange Networks, where chemical sorption takes place. In the third part, the mass Exchange hyperstructure is extended to include regeneration of the lean streams. A number of examples illustrate the applicability of the proposed approach to several problems of waste minimization and demonstrate the impact of simultaneously minimizing operating and investment cost
İnci Şentarli - One of the best experts on this subject based on the ideXlab platform.
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Heat-integration retrofit study of a petroleum refinery
Applied Energy, 2003Co-Authors: Salih Dinçer, İnci ŞentarliAbstract:The operation of a petroleum refinery at TUPRAS. Tutunciftlik was assessed using the pinch-design method. By making use of heat integration in the heat-Exchange Network, appreciable amounts of energy can be saved as a result of a capital investment having a pay-back period of about 6·5 months.
