The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Fatma H. Ashour - One of the best experts on this subject based on the ideXlab platform.
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new set of Graphical axes for grassroots design of heat exchanger networks for chemical engineering applications
2020Co-Authors: Dina A. Kamel, Mamdouh Gadalla, Fatma H. AshourAbstract:Abstract This paper presents a Graphical Technique for optimum design of heat exchanger networks (HENs) by applying the pinch analysis rules. The new contribution of this Graphical approach is to include the driving force of temperatures and their variations throughout the design in the Graphical representations. This would allow the consideration of both heat transfer area and energy during the design/analysis. The Graphical approach is applied on a case study of low temperature distillation process.
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Analysis and revamping of heat exchanger networks for crude oil refineries using temperature driving force Graphical Technique
Clean Technologies and Environmental Policy, 2018Co-Authors: Dina A. Kamel, Mamdouh A. Gadalla, Fatma H. AshourAbstract:The refining industry is an energy-intensive industry; most of the energy is consumed in heating and cooling requirements. Revamping or retrofitting of existing chemical engineering plants is an appropriate opportunity for improving and enhancing the existing heat exchanger network’s (HEN) design and performance. Revamping is commonly used to modify the existing process for many objectives, such as saving energy, reducing the environmental emissions and increasing the productivity of the plant. This paper presents a new Graphical approach for the analysis and revamping of existing HENs based on pinch analysis rules. The HEN is represented on a simple graph, where the cold stream temperatures are plotted on the X-axis, while the temperature driving forces for each exchanger are plotted on the Y-axis. This Graphical Technique describes the energy analysis problems in terms of temperature driving force (TDF) inside the heat exchanger, which is an important factor in the revamping process as the difference in that temperature driving force is involved in the calculation of the area of heat exchangers, consequently affecting the cost. Also, each exchanger is represented in this graph as a straight line whose slope is related to the heat capacities and length is related to the heat flow. The TDF Graphical approach is applied to an existing HEN in an Egyptian crude oil refinery. The detailed steps for the Graphical analysis and revamping are applied on the HEN for the objective of energy savings, and obtained results showed savings of approximately 10.5% in the energy demand with minor structural modifications and equivalent energy cost savings of 360,000 $/year.
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a new Graphical Technique for energy efficient design of heat recovery system in chemical refining industries
International Journal of Recent Contributions from Engineering Science & IT, 2016Co-Authors: Dina A. Kamel, Mamdouh A. Gadalla, Fatma H. AshourAbstract:Chemical processes are energy intensive industries; the majority of energy consumed in industrial processes is mainly used for heating and cooling requirements. This results in increasing the interest in obtaining the optimum design of the heat exchanger networks to reduce the energy consumption and face the growing energy crises. Most of the published literature over the last fifty years promotes the process integration technology as a main part of the process system engineering science. Graphical Pinch Analysis method normally includes two key steps, firstly obtaining the energy targets which include the minimum energy required for the HEN design, then designing the heat exchanger network (HEN). This paper introduces a new Graphical approach for the design of new heat exchanger networks (HENs) based on pinch analysis rules. The HEN is represented on a simple graph, where the cold stream temperatures are plotted on the X-axis while the driving forces for each exchanger are plotted on the Y-axis. This Graphical Technique can describe the energy analysis problems in term of temperature driving force inside the heat exchanger, which is an important factor in the design process as the differences in these driving forces are involved in calculating the area of heat exchangers, and consequently affecting the cost.
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revamping of heat exchanger network of an egyptian refinery plant using new temperature driving force tdf Graphical Technique
Chemical engineering transactions, 2016Co-Authors: Dina A. Kamel, Fatma H. AshourAbstract:This paper introduces a new Graphical approach for revamping of existing heat exchanger networks (HENs) based on pinch analysis rules. The HEN is represented on a simple graph, where the cold stream temperatures are plotted on the X-axis against the driving forces for each exchanger plotted on the Y-axis. This Graphical Technique can describe the energy analysis problems in term of temperature driving force inside the heat exchanger, which is an important factor in the revamping process as the differences in these driving forces are involved in calculating the area of heat exchangers, and consequently affecting the revamping cost. Also, each exchanger is represented in this graph as a straight line with a slope related to the heat capacity flows and length as function of the heat duty. An algorithm for revamping is also proposed.The temperature driving force new representation is applied on an existing HEN in an Egyptian refinery (EORU) to boost its energy efficiency. The Graphical revamping in application on the HEN shows savings of approximately 10 % in the energy demand with minor structural modifications.
D Harell - One of the best experts on this subject based on the ideXlab platform.
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rigorous Graphical targeting for resource conservation via material recycle reuse networks
Industrial & Engineering Chemistry Research, 2003Co-Authors: Mahmoud M Elhalwagi, F Gabriel, D HarellAbstract:Material recycle/reuse is one of the key strategies in reducing the consumption of fresh resources in the process industries. Over the past decade, several Techniques have been developed to reduce the consumption of specific material utilities such as water and hydrogen. To date, none of the published Techniques provides a noniterative, systematic, and Graphical Technique for identifying a target for minimum usage of the fresh resources ahead of detailed design of the recycle/reuse network. In this paper, we present a rigorous Graphical targeting approach to minimize the use of fresh resources by using segregation, mixing, and direct recycle/reuse strategies. First, the problem is formulated mathematically to provide a systematic basis for its solution. Then, dynamic programming Techniques are employed to derive the mathematical conditions and characteristics of an optimal solution strategy. These conditions and characteristics are transformed into a Graphical form that can be readily used to identify rig...
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process design and control rigorous Graphical targeting for resource conservation via material recycle reuse networks
2003Co-Authors: Mahmoud M Elhalwagi, F Gabriel, D HarellAbstract:Material recycle/reuse is one of the key strategies in reducing the consumption of fresh resources in the process industries. Over the past decade, several Techniques have been developed to reduce the consumption of specific material utilities such as water and hydrogen. To date, none of the published Techniques provides a noniterative, systematic, and Graphical Technique for identifying a target for minimum usage of the fresh resources ahead of detailed design of the recycle/reuse network. In this paper, we present a rigorous Graphical targeting approach to minimize the use of fresh resources by using segregation, mixing, and direct recycle/reuse strategies. First, the problem is formulated mathematically to provide a systematic basis for its solution. Then, dynamic programming Techniques are employed to derive the mathematical conditions and characteristics of an optimal solution strategy. These conditions and characteristics are transformed into a Graphical form that can be readily used to identify rigorous targets for minimum usage of fresh resources. The Graphical Technique is also useful in locating a material recycle/reuse pinch point, which provides insightful information on the use of fresh resources, the discharge of unused materials, and the relationships between process streams (sources) and units (sinks). Several test problems are solved to illustrate the ease, rigor, and applicability of the developed targeting Technique.
Mamdouh A. Gadalla - One of the best experts on this subject based on the ideXlab platform.
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Analysis and revamping of heat exchanger networks for crude oil refineries using temperature driving force Graphical Technique
Clean Technologies and Environmental Policy, 2018Co-Authors: Dina A. Kamel, Mamdouh A. Gadalla, Fatma H. AshourAbstract:The refining industry is an energy-intensive industry; most of the energy is consumed in heating and cooling requirements. Revamping or retrofitting of existing chemical engineering plants is an appropriate opportunity for improving and enhancing the existing heat exchanger network’s (HEN) design and performance. Revamping is commonly used to modify the existing process for many objectives, such as saving energy, reducing the environmental emissions and increasing the productivity of the plant. This paper presents a new Graphical approach for the analysis and revamping of existing HENs based on pinch analysis rules. The HEN is represented on a simple graph, where the cold stream temperatures are plotted on the X-axis, while the temperature driving forces for each exchanger are plotted on the Y-axis. This Graphical Technique describes the energy analysis problems in terms of temperature driving force (TDF) inside the heat exchanger, which is an important factor in the revamping process as the difference in that temperature driving force is involved in the calculation of the area of heat exchangers, consequently affecting the cost. Also, each exchanger is represented in this graph as a straight line whose slope is related to the heat capacities and length is related to the heat flow. The TDF Graphical approach is applied to an existing HEN in an Egyptian crude oil refinery. The detailed steps for the Graphical analysis and revamping are applied on the HEN for the objective of energy savings, and obtained results showed savings of approximately 10.5% in the energy demand with minor structural modifications and equivalent energy cost savings of 360,000 $/year.
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a new Graphical Technique for energy efficient design of heat recovery system in chemical refining industries
International Journal of Recent Contributions from Engineering Science & IT, 2016Co-Authors: Dina A. Kamel, Mamdouh A. Gadalla, Fatma H. AshourAbstract:Chemical processes are energy intensive industries; the majority of energy consumed in industrial processes is mainly used for heating and cooling requirements. This results in increasing the interest in obtaining the optimum design of the heat exchanger networks to reduce the energy consumption and face the growing energy crises. Most of the published literature over the last fifty years promotes the process integration technology as a main part of the process system engineering science. Graphical Pinch Analysis method normally includes two key steps, firstly obtaining the energy targets which include the minimum energy required for the HEN design, then designing the heat exchanger network (HEN). This paper introduces a new Graphical approach for the design of new heat exchanger networks (HENs) based on pinch analysis rules. The HEN is represented on a simple graph, where the cold stream temperatures are plotted on the X-axis while the driving forces for each exchanger are plotted on the Y-axis. This Graphical Technique can describe the energy analysis problems in term of temperature driving force inside the heat exchanger, which is an important factor in the design process as the differences in these driving forces are involved in calculating the area of heat exchangers, and consequently affecting the cost.
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a novel Graphical Technique for pinch analysis applications energy targets and grassroots design
Energy Conversion and Management, 2015Co-Authors: Mamdouh A. GadallaAbstract:Abstract Pinch Analysis is for decades a leading tool to energy integration for retrofit and design. This paper presents a new Graphical Technique, based on Pinch Analysis, for the grassroots design of heat exchanger networks. In the new graph, the temperatures of hot streams are plotted versus those of the cold streams. The temperature–temperature based graph is constructed to include temperatures of hot and cold streams as straight lines, horizontal lines for hot streams, and vertical lines for cold streams. The graph is applied to determine the pinch temperatures and Energy Targets. It is then used to synthesise Graphically a complete exchanger network, achieving the Energy Targets. Within the new graph, exchangers are represented by inclined straight lines, whose slopes are proportional to the ratio of heat capacities and flows. Pinch Analysis principles for design are easily interpreted using this new Graphical Technique to design a complete exchanger network. Network designs achieved by the new Technique can guarantee maximum heat recovery. The new Technique can also be employed to simulate basic designs of heat exchanger networks. The strengths of the new tool are that it is simply applied using computers, requires no commercial software, and can be used for academic purposes/engineering education.
Somenath Sarkar - One of the best experts on this subject based on the ideXlab platform.
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characterisation of a single mode trapezoidal index fiber by splice loss Technique using lateral offset
Optik, 2019Co-Authors: Anirban Roy Chowdhury, Dharmadas Kumbhakar, Somenath SarkarAbstract:Abstract A simple and straight-forward method is presented for prediction of unknown aspect ratio of a given single mode trapezoidal index fiber, using splice loss Technique in presence of lateral offset at the splice between them. First, we propose a simple Technique to evaluate the modal spot size of trapezoidal index fiber with normalised lateral offset between two such identical fibers taken from same pool. Using this fiber spot size as a test case in splice loss between two perfectly aligned step index and trapezoidal index fiber, we predict the unknown aspect ratio and justify it using a recently available empirical relation and a Graphical Technique.
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prediction of unknown aspect ratio of a single mode trapezoidal index fiber using splice loss Technique considering angular misalignment
Optik, 2018Co-Authors: Ivy Dutta, Dharmadas Kumbhakar, Somenath SarkarAbstract:Abstract We use the splice loss measurement Technique in absence and presence of angular misalignment and report a simple and accurate method to predict the unknown aspect ratio of a supplied circular core trapezoidal index single mode fiber. We, first, propose to determine the spot size of the unknown fiber from splice between two such fibers with angular misalignment. Then using a known empirical relation of power transmission coefficient and a Graphical Technique, we employ this spot size in splice loss between a step index and trapezoidal index fiber in absence of angular misalignment to predict the unknown aspect ratio. The method should find wide use by system developers and system users.
Dharmadas Kumbhakar - One of the best experts on this subject based on the ideXlab platform.
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characterisation of a single mode trapezoidal index fiber by splice loss Technique using lateral offset
Optik, 2019Co-Authors: Anirban Roy Chowdhury, Dharmadas Kumbhakar, Somenath SarkarAbstract:Abstract A simple and straight-forward method is presented for prediction of unknown aspect ratio of a given single mode trapezoidal index fiber, using splice loss Technique in presence of lateral offset at the splice between them. First, we propose a simple Technique to evaluate the modal spot size of trapezoidal index fiber with normalised lateral offset between two such identical fibers taken from same pool. Using this fiber spot size as a test case in splice loss between two perfectly aligned step index and trapezoidal index fiber, we predict the unknown aspect ratio and justify it using a recently available empirical relation and a Graphical Technique.
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prediction of unknown aspect ratio of a single mode trapezoidal index fiber using splice loss Technique considering angular misalignment
Optik, 2018Co-Authors: Ivy Dutta, Dharmadas Kumbhakar, Somenath SarkarAbstract:Abstract We use the splice loss measurement Technique in absence and presence of angular misalignment and report a simple and accurate method to predict the unknown aspect ratio of a supplied circular core trapezoidal index single mode fiber. We, first, propose to determine the spot size of the unknown fiber from splice between two such fibers with angular misalignment. Then using a known empirical relation of power transmission coefficient and a Graphical Technique, we employ this spot size in splice loss between a step index and trapezoidal index fiber in absence of angular misalignment to predict the unknown aspect ratio. The method should find wide use by system developers and system users.
