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    Constructal Design of Energy Systems

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    Date
    2016
    Author
    Alalaimi, Mohammad Ali
    Advisors
    Bejan, Adrian
    Lorente, Sylvie
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    Abstract

    This dissertation shows the use of Constructal law to find the relation between the morphing of the system configuration and the improvements in the global performance of the complex flow system. It shows that the better features of both flow and heat transfer architecture can be found and predicted by using the constructal law in energy systems. Chapter 2 shows the effect of flow configuration on the heat transfer performance of a spiral shaped pipe embedded in a cylindrical conducting volume. Several configurations were considered. The optimal spacings between the spiral turns and spire planes exist, such that the volumetric heat transfer rate is maximal. The optimized features of the heat transfer architecture are robust. Chapter 3 shows the heat transfer performance of a helically shaped pipe embedded in a cylindrical conducting volume. It shows that the optimized features of the heat transfer architecture are robust with respect to changes in several physical parameters. Chapter 4 reports analytically the formulas for effective permeability in several configurations of fissured systems, using the closed-form description of tree networks designed to provide flow access. The permeability formulas do not vary much from one tree design to the next, suggesting that similar formulas may apply to naturally fissured porous media with unknown precise details, which occur in natural reservoirs. Chapter 5 illustrates a counterflow heat exchanger consists of two plenums with a core. The results show that the overall flow and thermal resistance are lowest when the core is absent. Overall, the constructal design governs the evolution of flow configuration in nature and energy systems.

    Type
    Dissertation
    Department
    Mechanical Engineering and Materials Science
    Subject
    Mechanical engineering
    Alternative energy
    Constructal
    Design
    Energy
    Fluid
    Heat transfer
    Renewable Energy
    Permalink
    https://hdl.handle.net/10161/12112
    Citation
    Alalaimi, Mohammad Ali (2016). Constructal Design of Energy Systems. Dissertation, Duke University. Retrieved from https://hdl.handle.net/10161/12112.
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    Creative Commons License
    This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.

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