The Experts below are selected from a list of 87 Experts worldwide ranked by ideXlab platform
Debangsu Bhattacharyya - One of the best experts on this subject based on the ideXlab platform.
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Design and dynamic modeling of printed circuit heat exchangers for supercritical carbon dioxide Brayton power cycles
Applied Energy, 2018Co-Authors: Yuan Jiang, Eric Liese, Stephen E. Zitney, Debangsu BhattacharyyaAbstract:Abstract Due to the unique geometries and hydraulics of printed circuit heat exchangers and rapidly changing properties of supercritical carbon dioxide, the effective design and rating of printed circuit heat exchangers is an essential requirement for their use in supercritical carbon dioxide power cycles. In this study, one-dimensional design and dynamic models have been developed in Aspen Custom Modeler for printed circuit heat exchangers utilized in printed circuit heat exchangers Brayton power cycles. The design model is used to determine the optimal geometry parameters by minimizing the metal mass. The dynamic model is used to predict transient behavior and can be easily implemented into system-level models developed in Aspen Plus Dynamics for cycle performance evaluations. In these models, the heat transfer coefficient and friction factor are calculated using data reported by Heatric, a prominent printed circuit heat exchanger manufacturer. Both models are validated by comparing with the data from a small-scale exchanger used in the 100 kWe facility operated by the Naval Nuclear Laboratory, and then applied to design and simulate low- and high-temperature recuperators for a 10 MWe supercritical carbon dioxide indirect recompression closed Brayton cycle, which is of interest to the U.S. Department of Energy. The designs and dynamic responses of the printed circuit heat exchangers are compared with conventional shell-and-tube exchangers and microtube shell-and-tube exchangers for the same applications. The simulation results indicate that the proposed printed circuit heat exchangers have fast dynamic responses due to their small metal masses and high heat transfer coefficients compared with the conventional shell-and-tube exchangers. Even though the metal masses of the designed PCHEs are slightly higher than those of the microtube shell-and-tube exchangers, the printed circuit heat exchangers are still promising candidates for heat recuperation because of their mature manufacturing procedures and abundant laboratory and industrial operating experience.
Brian S. Haynes - One of the best experts on this subject based on the ideXlab platform.
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scaleable microstructured plant for steam reforming of methane
Chemical Engineering Journal, 2008Co-Authors: Elc Seris, G. Abramowitz, Anthony Matthew Johnston, Brian S. HaynesAbstract:We report results obtained in a demonstration plant for hydrogen production at 5 Nm 3 h −1 in a microchannel system constructed using techniques proven in Heatric printed-circuit heat exchangers (PCHE). The manufacturing technique allows great complexity in the design to be achieved with little incremental cost and our plant takes advantage of this to carry out the combustion and reforming reactions in highly integrated multiple adiabatic beds (MAB). The PCHE manufacturing technique is scaleable and the results from this small-scale plant demonstrate not only a practical miniplant for distributed manufacture of hydrogen but also provide the design basis for much larger plant (for example for transport fuelling and industrial applications) based on replication of the plate structures. The system operated at 2 bar to produce hydrogen for a notional PEM fuel cell, with essentially complete conversion of natural gas in the reformer to equilibrium yields of CO, CO2 and H2 (∼80%). The plant showed excellent turn-down characteristics to 30% of design capacity. © 2007 Elsevier B.V. All rights reserved.
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Pilot plant for distributed production of hydrogen from steam methane reforming
2004Co-Authors: Elc Seris, G. Abramowitz, Anthony Matthew Johnston, Brian S. HaynesAbstract:A pilot plant producing hydrogen by steam reforming of natural gas is presented. The steam reforming unit utilises Heatric Printed Circuit Heat Exchanger (PCHE) technology together with a high degree of process integration. Modular and easy to manufacture, the system produces syngas and hydrogen with high energy efficiency. The passive control of the temperatures is achieved through the use of multiple-adiabatic beds, distributed addition of fresh reactants, and by using a combination of counter- and co-current heat exchangers. The steam reforming reaction is heated by catalytic combustion of a mixture of hydrogen and carbon dioxide. The plant is heavily instrumented with monitoring and operations controlled through a commercial PLC. This project demonstrates a technology platform for distributed manufacture of chemicals in miniaturised plant. The potential advantages of such distributed production include lower costs, increased safety, and improved reliability of supply.
Yuan Jiang - One of the best experts on this subject based on the ideXlab platform.
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Design and dynamic modeling of printed circuit heat exchangers for supercritical carbon dioxide Brayton power cycles
Applied Energy, 2018Co-Authors: Yuan Jiang, Eric Liese, Stephen E. Zitney, Debangsu BhattacharyyaAbstract:Abstract Due to the unique geometries and hydraulics of printed circuit heat exchangers and rapidly changing properties of supercritical carbon dioxide, the effective design and rating of printed circuit heat exchangers is an essential requirement for their use in supercritical carbon dioxide power cycles. In this study, one-dimensional design and dynamic models have been developed in Aspen Custom Modeler for printed circuit heat exchangers utilized in printed circuit heat exchangers Brayton power cycles. The design model is used to determine the optimal geometry parameters by minimizing the metal mass. The dynamic model is used to predict transient behavior and can be easily implemented into system-level models developed in Aspen Plus Dynamics for cycle performance evaluations. In these models, the heat transfer coefficient and friction factor are calculated using data reported by Heatric, a prominent printed circuit heat exchanger manufacturer. Both models are validated by comparing with the data from a small-scale exchanger used in the 100 kWe facility operated by the Naval Nuclear Laboratory, and then applied to design and simulate low- and high-temperature recuperators for a 10 MWe supercritical carbon dioxide indirect recompression closed Brayton cycle, which is of interest to the U.S. Department of Energy. The designs and dynamic responses of the printed circuit heat exchangers are compared with conventional shell-and-tube exchangers and microtube shell-and-tube exchangers for the same applications. The simulation results indicate that the proposed printed circuit heat exchangers have fast dynamic responses due to their small metal masses and high heat transfer coefficients compared with the conventional shell-and-tube exchangers. Even though the metal masses of the designed PCHEs are slightly higher than those of the microtube shell-and-tube exchangers, the printed circuit heat exchangers are still promising candidates for heat recuperation because of their mature manufacturing procedures and abundant laboratory and industrial operating experience.
Elc Seris - One of the best experts on this subject based on the ideXlab platform.
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scaleable microstructured plant for steam reforming of methane
Chemical Engineering Journal, 2008Co-Authors: Elc Seris, G. Abramowitz, Anthony Matthew Johnston, Brian S. HaynesAbstract:We report results obtained in a demonstration plant for hydrogen production at 5 Nm 3 h −1 in a microchannel system constructed using techniques proven in Heatric printed-circuit heat exchangers (PCHE). The manufacturing technique allows great complexity in the design to be achieved with little incremental cost and our plant takes advantage of this to carry out the combustion and reforming reactions in highly integrated multiple adiabatic beds (MAB). The PCHE manufacturing technique is scaleable and the results from this small-scale plant demonstrate not only a practical miniplant for distributed manufacture of hydrogen but also provide the design basis for much larger plant (for example for transport fuelling and industrial applications) based on replication of the plate structures. The system operated at 2 bar to produce hydrogen for a notional PEM fuel cell, with essentially complete conversion of natural gas in the reformer to equilibrium yields of CO, CO2 and H2 (∼80%). The plant showed excellent turn-down characteristics to 30% of design capacity. © 2007 Elsevier B.V. All rights reserved.
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Pilot plant for distributed production of hydrogen from steam methane reforming
2004Co-Authors: Elc Seris, G. Abramowitz, Anthony Matthew Johnston, Brian S. HaynesAbstract:A pilot plant producing hydrogen by steam reforming of natural gas is presented. The steam reforming unit utilises Heatric Printed Circuit Heat Exchanger (PCHE) technology together with a high degree of process integration. Modular and easy to manufacture, the system produces syngas and hydrogen with high energy efficiency. The passive control of the temperatures is achieved through the use of multiple-adiabatic beds, distributed addition of fresh reactants, and by using a combination of counter- and co-current heat exchangers. The steam reforming reaction is heated by catalytic combustion of a mixture of hydrogen and carbon dioxide. The plant is heavily instrumented with monitoring and operations controlled through a commercial PLC. This project demonstrates a technology platform for distributed manufacture of chemicals in miniaturised plant. The potential advantages of such distributed production include lower costs, increased safety, and improved reliability of supply.
Eric Liese - One of the best experts on this subject based on the ideXlab platform.
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Design and dynamic modeling of printed circuit heat exchangers for supercritical carbon dioxide Brayton power cycles
Applied Energy, 2018Co-Authors: Yuan Jiang, Eric Liese, Stephen E. Zitney, Debangsu BhattacharyyaAbstract:Abstract Due to the unique geometries and hydraulics of printed circuit heat exchangers and rapidly changing properties of supercritical carbon dioxide, the effective design and rating of printed circuit heat exchangers is an essential requirement for their use in supercritical carbon dioxide power cycles. In this study, one-dimensional design and dynamic models have been developed in Aspen Custom Modeler for printed circuit heat exchangers utilized in printed circuit heat exchangers Brayton power cycles. The design model is used to determine the optimal geometry parameters by minimizing the metal mass. The dynamic model is used to predict transient behavior and can be easily implemented into system-level models developed in Aspen Plus Dynamics for cycle performance evaluations. In these models, the heat transfer coefficient and friction factor are calculated using data reported by Heatric, a prominent printed circuit heat exchanger manufacturer. Both models are validated by comparing with the data from a small-scale exchanger used in the 100 kWe facility operated by the Naval Nuclear Laboratory, and then applied to design and simulate low- and high-temperature recuperators for a 10 MWe supercritical carbon dioxide indirect recompression closed Brayton cycle, which is of interest to the U.S. Department of Energy. The designs and dynamic responses of the printed circuit heat exchangers are compared with conventional shell-and-tube exchangers and microtube shell-and-tube exchangers for the same applications. The simulation results indicate that the proposed printed circuit heat exchangers have fast dynamic responses due to their small metal masses and high heat transfer coefficients compared with the conventional shell-and-tube exchangers. Even though the metal masses of the designed PCHEs are slightly higher than those of the microtube shell-and-tube exchangers, the printed circuit heat exchangers are still promising candidates for heat recuperation because of their mature manufacturing procedures and abundant laboratory and industrial operating experience.