Tesis doctoral de Ivette María Rodriguez Perez
Thermal storage devices are widely used in many thermal systems and applications that are characterised by the delay between energy production and consumption, such as thermal solar systems. The improvement in their design and optimisation is a key aspect in the thermal optimisation of the system, where a good preformance of the storage tank can represent a considerable increase in the overall efficiency of the installation. In the subject of optimisation of thermal equipment, computational fluid dynamics have been consolidated as an indispensable tool providing researchers and engineers with a method to test virtually their prototypes with low effort in time, personnel and resources. This thesis is focused in the numerical simulation of unsteady laminar convection in cylindrical domains and its application to the study of the heat transfer and fluid flow that take place in stratified storage tanks. The first part of this document is devoted to present the methodology followed for the numerical resolution of the governing equation of heat and fluid flow in cylindrical coordinates. The main particularities of the discretisation of the equations in these geometries, as well as the solution procedure for incompressible and transient flow problems are also presented. Special emphasis is given to the verification of the code, the ppropriateness of the discretisation adopted and the verification of the numerical solution obtained. The second part of this thesis is focused on the study of the heat transfer and fluid flow phenomena that take place in stratified storage tanks, including the performance measures and modeling efforts of these devices. The quality of the energy stored is determined by the degree of the thermal stratification of the storage tank, which is affected by several factors such as the mixing due to the inlet streams during load and unload, the heat losses to the environment, among others. In this sense, thermal stratification analysis is carried out b
Datos académicos de la tesis doctoral «Unsteady laminar convection in cylindrical domains: numerical studies and application to solar water storage tanks«
- Título de la tesis: Unsteady laminar convection in cylindrical domains: numerical studies and application to solar water storage tanks
- Autor: Ivette María Rodriguez Perez
- Universidad: Politécnica de catalunya
- Fecha de lectura de la tesis: 19/12/2006
Dirección y tribunal
- Director de la tesis
- Assensi Oliva Llena
- Tribunal
- Presidente del tribunal: carles david Pérez segarra
- José Fernández seara (vocal)
- Antonio Lecuona neumann (vocal)
- esteban Codina macia (vocal)