| The topic of this dissertation is to find optimum design parameters for maximum exergy storage and extraction. This search is done theoretically in the sense of thermodynamic and heat transfer optimization.;The first chapter discusses the importance of the new assess of energy resources based on the Second Law of Thermodynamics. It suggests several theoretical approaches for maximum energy storage and extraction.;The second chapter describes the advantage of using more than two elements for energy storage in a phase-change material (PCM). Also it shows that during the process of melting followed by solidification of PCM in unmixed stream, the optimum melting temperature (T;The third chapter presents the most basic thermodynamic aspects (First and Second Law) of hot dry rock (HDR) energy extraction process. It shows which parameters influence the most the amount of useful energy (exergy) extracted from the HDR reservoir over a fixed time interval. And optimum flow rate for maximum exergy delivery over the lifetime of the HDR system is found.;Thc fourth chapter analyzes the phenomenon of natural convection with radiation heat transfer in a cavity with open top end. As a conclusion, it presents the relationship of several parameters which influence the most amount of heat transfer from the cavity.;The fifth chapter documents the conjugate heat transfer through a wall with nonuniform thickness, which is lined on one side by a boundary layer. Both the analytical and numerical solutions show that total heat transfer rate through a wall decreases, or insulation effect increases, when the wall profile is tampered so that the wall thickness decreases in the direction of flow.;The sixth chapter presents a correlation for the heat transfer of melting dominated by natural convection. This laminar-flow correlation holds for Pr values higher than approximately Ra/10... |
