Abstract
Solar concentrator technology has been researches in different fields in order to enhancement efficiency and energy storage of these systems. Some changes in fluid and numerous components of the collectors has been proposed in recent years. In this context, this paper present results associates to the modeling and thermal analysis of a concentrating system based on parabolic through collector with receiver piper, designed with fractal geometry with the aim of improve system heat transfer. Founded on thermal modeling of heat transfer phenomena as radiation, convection and conduction, physical and mathematical relations between fractal geometrical parameters and transfer heat coefficient were established to find the influence of a chaotic structure on thermal behavior. Proposed designs were simulated through Solid works ® Flow Simulation tool. Was possible obtain maximum temperatures in air with fractal and cylindrical pipes of de 89°C, 86°C y 81°C respectively. The gap between fractal geometry results and cylindrical geometry is 10°C around.
Highlights
Within technology with high development in solar energy, we found first of all, photovoltaic and concentrating collectors
Different geometries for pipe receiver of a parabolic cylindrical collector were studied in this work
Heptagonal pipe and iteration of lineal fractal, general heat transfer coefficient or convection coefficient, vary according to hydraulic diameter and transfer area, which are related with Nusselt and Reynolds number, by reducing in each fractal iteration the geometry diameter is increase the transfer heat
Summary
Within technology with high development in solar energy, we found first of all, photovoltaic and concentrating collectors. Some studies and researches globally, about solar collection systems by parabolic cylindrical collectors, are related with heat transfer enhancement in receiver pipe under different guidelines, [8]–[10]. Nano-fluids and Nano-particles concepts are involves in collector thermal efficiency, [11]–[13] Presently this kind of fluids are not applied in CCP stations, use of them involve specific requirements in hydraulic elements as pumps, valves, connection pipes, among others, [14]. Nano-fluids potential has been experimented in [15], where heat transfer with forced convection was studied, inside the receiver of a parabolic cylindrical collector. Was possible identify a 28% increase of thermal coefficient with Al2O3 – H2O combination and a 35% increase with CuO- H2O combination regard to pure water
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