CONVECTIVE HEAT TRANSFER IN A DISK- RECEIVER OF A SOLAR CONCENTRATED RADIATIVE FLUX MEASURING SYSTEM

摘要

A parametric study to simulate the thermal performance under various conditions of a disk-type receiver of a concentrated radiative flux measuring system, is presented. The system is currently under construction at the Solar Energy Research Laboratory of the National University of Mexico. One of the proposed heat exchangers to be used in the receiver consists of two parallel, circular disks with an aspect ratio (diameter-to-separation) of 10. An incompressible viscous fluid (a thermal oil) enters at a center hole of one disk, moves radially between both plates, and is heated by means of concentrated solar energy impinging at the outer most plate. Temperature distributions, as a function of space coordinates, are presented for various flow conditions and radiation flux distributions. Plots of the average and maximum fluid temperatures as a function of mass flow rates for different solar concentrations, are also presented. These results, together with other alternatives, are being used for designing purposes of the receiver.