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Daniel Favrat - One of the best experts on this subject based on the ideXlab platform.
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energy integration of industrial processes based on the pinch analysis method extended to include exergy Factors
Applied Thermal Engineering, 1996Co-Authors: Frederic Staine, Daniel FavratAbstract:The energy integration of industrial processes is becoming increasingly more effective thanks to new methodological developments such as pinch technology. This paper aims at extending the number of Factors considered in pinch analysis towards a life-cycle optimisation and proposes new synthesis representation schemes. The original pinch method centres primarily on maximizing the internal heat transfer with the choice of appropriate ΔTmins. The proposed extension takes into account the complete heat transfer exergy losses, the pressure drop exergy losses and the exergy associated with the fabrication of the heat exchangers. The extended composite curves graphically represent the above-mentioned losses on a Carnot Factor versus heat rate diagram. In a similar way, other high exergy inputs and outputs linked, for example, to the introduction of heat pumps and cogeneration units, are represented on a topping electricity versus Carnot Factor diagram. Such an extended exergy synthesis results in an improved and more coherent exergy balance for comparing energy recovery schemes. It offers a new insight and permits the identification of solutions which are more stable in time and fairly independent of changing economic conditions. The proposed approach is suitable for future extension to include pollution and resource scarcity Factors.
Frederic Staine - One of the best experts on this subject based on the ideXlab platform.
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energy integration of industrial processes based on the pinch analysis method extended to include exergy Factors
Applied Thermal Engineering, 1996Co-Authors: Frederic Staine, Daniel FavratAbstract:The energy integration of industrial processes is becoming increasingly more effective thanks to new methodological developments such as pinch technology. This paper aims at extending the number of Factors considered in pinch analysis towards a life-cycle optimisation and proposes new synthesis representation schemes. The original pinch method centres primarily on maximizing the internal heat transfer with the choice of appropriate ΔTmins. The proposed extension takes into account the complete heat transfer exergy losses, the pressure drop exergy losses and the exergy associated with the fabrication of the heat exchangers. The extended composite curves graphically represent the above-mentioned losses on a Carnot Factor versus heat rate diagram. In a similar way, other high exergy inputs and outputs linked, for example, to the introduction of heat pumps and cogeneration units, are represented on a topping electricity versus Carnot Factor diagram. Such an extended exergy synthesis results in an improved and more coherent exergy balance for comparing energy recovery schemes. It offers a new insight and permits the identification of solutions which are more stable in time and fairly independent of changing economic conditions. The proposed approach is suitable for future extension to include pollution and resource scarcity Factors.
Favrat Daniel - One of the best experts on this subject based on the ideXlab platform.
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Energy Integration of Industrial Processes Based on a Graphic Representation of Exergy Factors.
2005Co-Authors: Staine Frédéric, Favrat DanielAbstract:The energy integration of industrial processes is becoming increasingly more effective thanks to new methodological developments such as a pinch tecnology. The original method centers primarly on a consideration of the heat transfer exergy losses represented by the area between the composite curves on a Carnot Factor versus heat rate diagram. the present paper proposes an extension of this approach to account for pressure drop exergy losses as well as for the gray exergy associated with the fabrication of the heat exchangers. It is proposed to graphically represent on the same Carnot Factor versus heat rate diagram the above mentioned losses as well as other high exergy inputs and outputs linked, for example, to the introduction of heat pumps and cogeneration units. Such an extended exergy syntheses results in an improved and more coherent exergy balance for comparing energy recovery schemes. The proposed approach is suitable for future extension to include pollution and resource scarcity Factors
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Intégration énergétique de procédés industriels par la méthode du pincement étendue aux facteurs exergétiques.
2005Co-Authors: Staine Frédéric, Favrat DanielAbstract:The pinch analysis method is a useful tool for the energy integration of industrial processes (structuring and simplification using simple guidelines). The pinch analysis method, extended to include exergy Factors, falls within the framework of a global multidisciplinary analysis which considers in light of a sustainable development, economic, energetic, exergetic, and environmental Factors. One of the essential themes of such a global framework is the system’s life cycle analysis. This analysis considers the manufacture, the exploitation and the recycling of components (from cradle to grave). Such considerations as well as pressure drops in heat exchangers were not included in the original pinch method, which centered primarly on economic and heat transfer aspects. The extension of the pinch analysis method to include exergy Factors related to some of the considerations mentioned above, leads to a global exergy balance which includes irreversibility considerations due to heat transfer, dissipation and the manufacture of components. The thermodynamic optimisation of heat exchangers based on an optimal distibution of exergy losses is realized, and the grey exergy assiociated with the manufacture of shell and tube heat exchangers is calculated as an example. Further extension of the pinch method to include an electrical energy balance was also realized. Such a balance is particularly useful when intoducing heat pumps or power units. The extended composite curves which result from the extension above offer a graphic representation of all the exergy losses of the process using a Carnot Factor versus heat rate diagram and an electric power versus Carnot Factor diagram. With such diagrams, the choice of the optimal pinch value (Tmin) will be determined for the minimum total exergy loss of the process. The heat exchanger network design is also based on an exergetic criterion (the difference of global Carnot Factor) which allows an exergetic optimisation of the position of the heat exchanger. A procedure for selecting the different heat exchanger alternatives is included in the proposed design method. This procedure limits the number of network designs having the best chances to arrive at the optimal network (network with the minimum global exergy losses). The extended pinch analysis method proposed here has been applied to typical industrial processes with acceptable, consistent and sometimes differents results from those obtained with the original pinch method. This enrichment of the method will lead to better designs
Staine Frédéric - One of the best experts on this subject based on the ideXlab platform.
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Energy Integration of Industrial Processes Based on a Graphic Representation of Exergy Factors.
2005Co-Authors: Staine Frédéric, Favrat DanielAbstract:The energy integration of industrial processes is becoming increasingly more effective thanks to new methodological developments such as a pinch tecnology. The original method centers primarly on a consideration of the heat transfer exergy losses represented by the area between the composite curves on a Carnot Factor versus heat rate diagram. the present paper proposes an extension of this approach to account for pressure drop exergy losses as well as for the gray exergy associated with the fabrication of the heat exchangers. It is proposed to graphically represent on the same Carnot Factor versus heat rate diagram the above mentioned losses as well as other high exergy inputs and outputs linked, for example, to the introduction of heat pumps and cogeneration units. Such an extended exergy syntheses results in an improved and more coherent exergy balance for comparing energy recovery schemes. The proposed approach is suitable for future extension to include pollution and resource scarcity Factors
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Intégration énergétique de procédés industriels par la méthode du pincement étendue aux facteurs exergétiques.
2005Co-Authors: Staine Frédéric, Favrat DanielAbstract:The pinch analysis method is a useful tool for the energy integration of industrial processes (structuring and simplification using simple guidelines). The pinch analysis method, extended to include exergy Factors, falls within the framework of a global multidisciplinary analysis which considers in light of a sustainable development, economic, energetic, exergetic, and environmental Factors. One of the essential themes of such a global framework is the system’s life cycle analysis. This analysis considers the manufacture, the exploitation and the recycling of components (from cradle to grave). Such considerations as well as pressure drops in heat exchangers were not included in the original pinch method, which centered primarly on economic and heat transfer aspects. The extension of the pinch analysis method to include exergy Factors related to some of the considerations mentioned above, leads to a global exergy balance which includes irreversibility considerations due to heat transfer, dissipation and the manufacture of components. The thermodynamic optimisation of heat exchangers based on an optimal distibution of exergy losses is realized, and the grey exergy assiociated with the manufacture of shell and tube heat exchangers is calculated as an example. Further extension of the pinch method to include an electrical energy balance was also realized. Such a balance is particularly useful when intoducing heat pumps or power units. The extended composite curves which result from the extension above offer a graphic representation of all the exergy losses of the process using a Carnot Factor versus heat rate diagram and an electric power versus Carnot Factor diagram. With such diagrams, the choice of the optimal pinch value (Tmin) will be determined for the minimum total exergy loss of the process. The heat exchanger network design is also based on an exergetic criterion (the difference of global Carnot Factor) which allows an exergetic optimisation of the position of the heat exchanger. A procedure for selecting the different heat exchanger alternatives is included in the proposed design method. This procedure limits the number of network designs having the best chances to arrive at the optimal network (network with the minimum global exergy losses). The extended pinch analysis method proposed here has been applied to typical industrial processes with acceptable, consistent and sometimes differents results from those obtained with the original pinch method. This enrichment of the method will lead to better designs
Jose Carbia Carril - One of the best experts on this subject based on the ideXlab platform.
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combined cycle consisting of closed processes based cycle powered by a reversible heat pump that exceed Carnot Factor
Journal of Advances in Physics, 2019Co-Authors: Ramon Ferreiro Garcia, Jose Carbia CarrilAbstract:This article deals with the task of analysing a feasible reversible combined cycle composed of a heat pump as the primary cycle and a non-condensing mode thermal engine characterized by operating under a closed processes based cycle that work by adding and releasing heat, as the secondary cycle. Two case studies are analysed and compared. According to the results, the case study based on the combination of a heat pump cycle with an organic Rankine cycle, is the paradigm of a reversible 100% efficient combined cycle. The case study based on a heat pump cycle and a reversible heating-cooling based cycle is the paradigm of a super-efficient combined cycle that yields a 1.486 power ratio (PR) or 148.6% efficiency. Further, the case based on a heat pump cycle with a regenerative irreversible heating-cooling based cycle, is the paradigm of energy conversion and energy generation that yields a 1.29 PR or 129% efficiency assuming limited irreversibilities.
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low grade heat based thermal cycles unconstrained by the Carnot Factor doing work by cooling
Energy, 2017Co-Authors: Ramon Ferreiro Garcia, Jose Carbia Carril, Steven Iglesias GarciaAbstract:The objective of the research is to convert heating and cooling energy into mechanical work capable of yielding high thermal efficiency while surpassing the Carnot Factor (CF), even when using low grade heat sources. To achieve the proposed objectives, a closed process-based thermal cycle composed of two isochoric and two adiabatic path functions is studied, where one of the isochoric transformations is dedicated to heat absorption, and the other is dedicated to heat release. The analysis is carried out on the basis of double-acting cylinder-based engine types, operating according to a closed process-based thermal cycle with air, helium and hydrogen as the working fluids, characterised by performing mechanical work both in the expansion phase due to heat addition, and in the contraction phase due to heat extraction. The proposed thermal cycles yield acceptable performance, even at medium and low temperatures (that is, for an exceptionally low ratio of the high to the low temperatures of the heat source and heat sink, respectively). The main results derived from a case study operating between 300 and 340 (K) with air, helium and hydrogen, give an efficiency of 56.32 (%), 78.64 (%) and 56.54 (%) respectively, and while the specific work amounts 12.78 (kJ/kg), 71.24 (kJ/kg) and 182.90 (kJ/kg) respectively.