The Experts below are selected from a list of 66228 Experts worldwide ranked by ideXlab platform
Aristide F Massardo - One of the best experts on this subject based on the ideXlab platform.
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optimal design of compact recuperators for microturbine application
Applied Thermal Engineering, 2005Co-Authors: Alberto Traverso, Aristide F MassardoAbstract:Abstract This paper presents a new approach for the optimization of microturbine recuperators from the technical and economic standpoints. The procedure proposed has been implemented in the software called CHEOPE (compact heat exchanger optimization and performance evaluation), which considers two types of recuperator concept, which have proved to be the most promising for microturbine applications: the furnace-brazed plate-fin type and the welded primary surface type. The general design rules for performance evaluation of gas–gas heat exchangers are summarized and specifically applied to these two types of recuperator. Moreover, the Cost Equation, employed to estimate the capital Cost of these types of heat exchanger, is discussed. With regard to the sizing procedure, a special optimization procedure of the recuperator matrix has been developed, which takes into account several targets in a single multi-objective function: the compactness, the pressure drops and the expected Cost of the device. The tests performed for the validation are presented, and three case studies are illustrated for three different microturbine sizes, for a 50 kW, 100 kW and 500 kW machine, respectively.
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optimal design of compact recuperators for microturbine application
Applied Thermal Engineering, 2005Co-Authors: Alberto Traverso, Aristide F MassardoAbstract:Abstract This paper presents a new approach for the optimization of microturbine recuperators from the technical and economic standpoints. The procedure proposed has been implemented in the software called CHEOPE (compact heat exchanger optimization and performance evaluation), which considers two types of recuperator concept, which have proved to be the most promising for microturbine applications: the furnace-brazed plate-fin type and the welded primary surface type. The general design rules for performance evaluation of gas–gas heat exchangers are summarized and specifically applied to these two types of recuperator. Moreover, the Cost Equation, employed to estimate the capital Cost of these types of heat exchanger, is discussed. With regard to the sizing procedure, a special optimization procedure of the recuperator matrix has been developed, which takes into account several targets in a single multi-objective function: the compactness, the pressure drops and the expected Cost of the device. The tests performed for the validation are presented, and three case studies are illustrated for three different microturbine sizes, for a 50 kW, 100 kW and 500 kW machine, respectively.
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cheope a tool for the optimal design of compact recuperators
ASME Turbo Expo 2004: Power for Land Sea and Air, 2004Co-Authors: Alberto Traverso, Federico Zanzarsi, Aristide F MassardoAbstract:This paper presents the organization, theoretical background and application of a new software tool for the optimization of the technical and economical design of microturbine recuperators. The code called CHEOPE (Compact Heat Exchanger Optimization and Performance Evaluation) considered two types of recuperator concept, which proved to be the most promising for microturbine applications: the furnace-brazed plate-fin type and the welded primary surface type. The general design rules for performance evaluation of gas-gas heat exchangers are summarized and specifically applied to these two types of recuperator. Moreover, the Cost Equation, employed to estimate the capital Cost of these types of heat exchanger, is discussed. CHEOPE can be used both for solving the sizing problem and the rating problem. With regard to the former, the code is capable of a special optimization of the recuperator matrix, which takes into account the compactness, the pressure drops and the expected Cost of the device. The objective function can be customized according to the designer’s priorities. The tests performed for the validation are presented, and three case studies are illustrated for three different microturbine sizes, for a 50kW, a 100kW and a 500kW machine.Copyright © 2004 by ASME
Alberto Traverso - One of the best experts on this subject based on the ideXlab platform.
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optimal design of compact recuperators for microturbine application
Applied Thermal Engineering, 2005Co-Authors: Alberto Traverso, Aristide F MassardoAbstract:Abstract This paper presents a new approach for the optimization of microturbine recuperators from the technical and economic standpoints. The procedure proposed has been implemented in the software called CHEOPE (compact heat exchanger optimization and performance evaluation), which considers two types of recuperator concept, which have proved to be the most promising for microturbine applications: the furnace-brazed plate-fin type and the welded primary surface type. The general design rules for performance evaluation of gas–gas heat exchangers are summarized and specifically applied to these two types of recuperator. Moreover, the Cost Equation, employed to estimate the capital Cost of these types of heat exchanger, is discussed. With regard to the sizing procedure, a special optimization procedure of the recuperator matrix has been developed, which takes into account several targets in a single multi-objective function: the compactness, the pressure drops and the expected Cost of the device. The tests performed for the validation are presented, and three case studies are illustrated for three different microturbine sizes, for a 50 kW, 100 kW and 500 kW machine, respectively.
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optimal design of compact recuperators for microturbine application
Applied Thermal Engineering, 2005Co-Authors: Alberto Traverso, Aristide F MassardoAbstract:Abstract This paper presents a new approach for the optimization of microturbine recuperators from the technical and economic standpoints. The procedure proposed has been implemented in the software called CHEOPE (compact heat exchanger optimization and performance evaluation), which considers two types of recuperator concept, which have proved to be the most promising for microturbine applications: the furnace-brazed plate-fin type and the welded primary surface type. The general design rules for performance evaluation of gas–gas heat exchangers are summarized and specifically applied to these two types of recuperator. Moreover, the Cost Equation, employed to estimate the capital Cost of these types of heat exchanger, is discussed. With regard to the sizing procedure, a special optimization procedure of the recuperator matrix has been developed, which takes into account several targets in a single multi-objective function: the compactness, the pressure drops and the expected Cost of the device. The tests performed for the validation are presented, and three case studies are illustrated for three different microturbine sizes, for a 50 kW, 100 kW and 500 kW machine, respectively.
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cheope a tool for the optimal design of compact recuperators
ASME Turbo Expo 2004: Power for Land Sea and Air, 2004Co-Authors: Alberto Traverso, Federico Zanzarsi, Aristide F MassardoAbstract:This paper presents the organization, theoretical background and application of a new software tool for the optimization of the technical and economical design of microturbine recuperators. The code called CHEOPE (Compact Heat Exchanger Optimization and Performance Evaluation) considered two types of recuperator concept, which proved to be the most promising for microturbine applications: the furnace-brazed plate-fin type and the welded primary surface type. The general design rules for performance evaluation of gas-gas heat exchangers are summarized and specifically applied to these two types of recuperator. Moreover, the Cost Equation, employed to estimate the capital Cost of these types of heat exchanger, is discussed. CHEOPE can be used both for solving the sizing problem and the rating problem. With regard to the former, the code is capable of a special optimization of the recuperator matrix, which takes into account the compactness, the pressure drops and the expected Cost of the device. The objective function can be customized according to the designer’s priorities. The tests performed for the validation are presented, and three case studies are illustrated for three different microturbine sizes, for a 50kW, a 100kW and a 500kW machine.Copyright © 2004 by ASME
Qingzhi Liu - One of the best experts on this subject based on the ideXlab platform.
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optimum design of reverse osmosis system under different feed concentration and product specification
Journal of Membrane Science, 2007Co-Authors: Xiuling Zhang, Qingzhi LiuAbstract:The design of various multistage RO systems under different feed concentration and product specification is presented in this work. An optimization method using the process synthesis approach to design an RO system has been developed. First, a simplified superstructure that contains all the feasible design in present desalination process has been presented. It offers extensive flexibility towards optimizing various types of RO system and thus may be used for the selection of the optimal structural and operating schemes. A pressure vessel model that takes into account the pressure drop and concentration changes in the membrane channel has also been given to simulate multi-element performance in the pressure vessel. Then the Cost Equation relating the capital and operating Cost to the design variables, as well as the structural variables of the designed system have been introduced in the objective function. Finally the optimum design problem can be formulated as a mixed-integer nonlinear programming (MINLP) problem, which minimizes the total annualized Cost. The solution to the problem includes optimal arrangement of the RO modules, pumps, energy recovery devices, the optimal operating conditions, and the optimal selection of types and number of membrane elements. The effectiveness of this design methodology has been demonstrated by solving several seawater desalination cases. Some of the trends of the optimum RO system design have been presented.
D E Lankford - One of the best experts on this subject based on the ideXlab platform.
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development and validation of a steep incline and decline metabolic Cost Equation for steady state walking
European Journal of Applied Physiology, 2020Co-Authors: D E Lankford, Jake T Bartschi, John E Hathaway, A D GidleyAbstract:The purpose of this study was to develop and validate a data-supported prediction Equation (Lankford Equation) for walking metabolic Cost ( $$C_{\text{W}}$$ ), and to compare this Equation to the ACSM, Pandolf, Minetti, and LCDA Equations. The current study also investigated how kinematics of incline walking relates to mechanical efficiency and metabolic Cost. Subjects consisted of 145 recreationally fit individuals. Walking speeds were between 1 AND 3 mph with grades ranging from − 18 to 40%. The Lankford Equation was then compared to four other reference Equations using adjusted R-squared (R2) and Root Mean Square Error (RMSE) as primary metrics to determine correlation with measured CW. Kinematics data collected from reflective markers placed on bony landmarks were compared to CW, incline, and metabolic efficiency to determine the interrelationship between these variables. The Lankford Equation for estimating $$C_{\text{W}}$$ was validated with an adjusted R2 = 0.89 and a RMSE of 5.92 Kj min−1, shown to have the highest accuracy among all Equations tested. A 0.21 efficiency plateau was observed above 15% incline, and hip, knee, HAT, thigh, and shank angles at foot touch down were found to be highly correlated with $$C_{\text{W}}$$ (r > 0.980). The Lankford Equation is a validated and highly accurate prediction Equation for steady-state walking across a wide range of inclines and speeds and is applicable to the general public. Altered leg swing observed above 15% incline was found to account for the mechanical efficiency plateau and the rectilinear increase in $$C_{\text{W}}$$ with increasing incline.
Xiuling Zhang - One of the best experts on this subject based on the ideXlab platform.
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optimum design of reverse osmosis system under different feed concentration and product specification
Journal of Membrane Science, 2007Co-Authors: Xiuling Zhang, Qingzhi LiuAbstract:The design of various multistage RO systems under different feed concentration and product specification is presented in this work. An optimization method using the process synthesis approach to design an RO system has been developed. First, a simplified superstructure that contains all the feasible design in present desalination process has been presented. It offers extensive flexibility towards optimizing various types of RO system and thus may be used for the selection of the optimal structural and operating schemes. A pressure vessel model that takes into account the pressure drop and concentration changes in the membrane channel has also been given to simulate multi-element performance in the pressure vessel. Then the Cost Equation relating the capital and operating Cost to the design variables, as well as the structural variables of the designed system have been introduced in the objective function. Finally the optimum design problem can be formulated as a mixed-integer nonlinear programming (MINLP) problem, which minimizes the total annualized Cost. The solution to the problem includes optimal arrangement of the RO modules, pumps, energy recovery devices, the optimal operating conditions, and the optimal selection of types and number of membrane elements. The effectiveness of this design methodology has been demonstrated by solving several seawater desalination cases. Some of the trends of the optimum RO system design have been presented.
