Numerical optimization of small-scale thermo-acoustic refrigerators considering maximum cooling
- Authors: Tartibu, L. K.
- Date: 2018
- Subjects: hermo-acoustic , Cooling , Optimization
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/280975 , uj:30220 , Citation: Tartibu, L.K. 2018. Numerical optimization of small-scale thermo-acoustic refrigerators considering maximum cooling.
- Description: Abstract: The use of sound wave to remove heat could potentially contribute significantly to the development of a more affordable, sustainable search of an effective solution for electronics coolers. This work provides details of the implementation of a lexicographic optimization scheme in order to address the issue of dimensional optimization of a small-scale standing-wave thermo-acoustic refrigerator system. The cooling load has been considered as main criteria in the formulation and the measurement of the performance of the system. The dimensional parameters describing the heart of the device, namely the porous media (or the stack), where the heat pumping takes place are the variables to optimize. The problem has been formulated as a non-linear programming problem with discontinuous derivatives and implemented in the General Algebraic Modelling Systems (GAMS). The main contributions of the work are the detailed GAMS model and the clarity about the most preferred position and length of the stack considering prior knowledge of its porosity. This work reveals that shorter stack perform relatively better with respect to the cooling load performance. In addition, it appears that the position of the stack within the resonator tube is closely related to its length for maximum performance of the device.
- Full Text:
- Authors: Tartibu, L. K.
- Date: 2018
- Subjects: hermo-acoustic , Cooling , Optimization
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/280975 , uj:30220 , Citation: Tartibu, L.K. 2018. Numerical optimization of small-scale thermo-acoustic refrigerators considering maximum cooling.
- Description: Abstract: The use of sound wave to remove heat could potentially contribute significantly to the development of a more affordable, sustainable search of an effective solution for electronics coolers. This work provides details of the implementation of a lexicographic optimization scheme in order to address the issue of dimensional optimization of a small-scale standing-wave thermo-acoustic refrigerator system. The cooling load has been considered as main criteria in the formulation and the measurement of the performance of the system. The dimensional parameters describing the heart of the device, namely the porous media (or the stack), where the heat pumping takes place are the variables to optimize. The problem has been formulated as a non-linear programming problem with discontinuous derivatives and implemented in the General Algebraic Modelling Systems (GAMS). The main contributions of the work are the detailed GAMS model and the clarity about the most preferred position and length of the stack considering prior knowledge of its porosity. This work reveals that shorter stack perform relatively better with respect to the cooling load performance. In addition, it appears that the position of the stack within the resonator tube is closely related to its length for maximum performance of the device.
- Full Text:
Optimal design of a standing wave thermoacoustic refrigerator using GAMS
- Tartibu, L.K., Sun, B., Kaunda, M.A.E.
- Authors: Tartibu, L.K. , Sun, B. , Kaunda, M.A.E.
- Date: 2015
- Subjects: Thermoacoustic refrigerator , Coefficient of Performance , Cooling , Multi-objective optimization , GAMS
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/17707 , uj:15915 , Citation: Tartibu, L.K., Sun, B. & Kaunda M.A.E. 2015. Optimal design of a standing wave thermoacoustic refrigerator using GAMS. Procedia Computer Science, 62, 611-618. The 2015 International Conference on Soft Computing and Software Engineering, 5-6 March, 2015, University of California, Berkeley.
- Description: Abstract: This work proposes a multi-objective optimization approach to model and optimize small scale standing wave thermoacoustic refrigerator (TAR). This study aims to optimize the geometric variables namely the stack position, the stack length, the blockage ratio and the plate spacing involved in designing thermoacoustic refrigerators. Unlike most previous studies, these variables are considered interdependent. System parameters and constraints that capture the underlying thermoacoustic dynamics have been used to define the models. The cooling load, the coefficient of performance and the acoustic power loss have been used to measure the performance of the device. The optimization task is formulated as a three-criterion nonlinear programming problem with discontinuous derivatives (DNLP). A practical example considering three different gases is given to illustrate the approach. This approach has been implemented in the software GAMS (General Algebraic modelling System) and Pareto optimal solutions describing the most preferred geometry for maximum performance of the device are computed using the augmented -constraint method.
- Full Text:
- Authors: Tartibu, L.K. , Sun, B. , Kaunda, M.A.E.
- Date: 2015
- Subjects: Thermoacoustic refrigerator , Coefficient of Performance , Cooling , Multi-objective optimization , GAMS
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/17707 , uj:15915 , Citation: Tartibu, L.K., Sun, B. & Kaunda M.A.E. 2015. Optimal design of a standing wave thermoacoustic refrigerator using GAMS. Procedia Computer Science, 62, 611-618. The 2015 International Conference on Soft Computing and Software Engineering, 5-6 March, 2015, University of California, Berkeley.
- Description: Abstract: This work proposes a multi-objective optimization approach to model and optimize small scale standing wave thermoacoustic refrigerator (TAR). This study aims to optimize the geometric variables namely the stack position, the stack length, the blockage ratio and the plate spacing involved in designing thermoacoustic refrigerators. Unlike most previous studies, these variables are considered interdependent. System parameters and constraints that capture the underlying thermoacoustic dynamics have been used to define the models. The cooling load, the coefficient of performance and the acoustic power loss have been used to measure the performance of the device. The optimization task is formulated as a three-criterion nonlinear programming problem with discontinuous derivatives (DNLP). A practical example considering three different gases is given to illustrate the approach. This approach has been implemented in the software GAMS (General Algebraic modelling System) and Pareto optimal solutions describing the most preferred geometry for maximum performance of the device are computed using the augmented -constraint method.
- Full Text:
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