Modelación y simulación del comportamiento térmico de un receptor de media temperatura tipo Fresnel de geometría trapezoidal.

Abstract

The present work proposes the development of a simplified model, programmed in Matlab language, that describes the thermal behavior of a Fresnel system receiver, of trapezoidal geometry, that uses as the absorber surface as a flat plate and a set of transport heat transfer fluid (HTF) pipelines. This receiver can be applied to replace traditional generating heat equipment in the food industry. The simplified model has been validated by comparing results with a numerical model developed in FLUENT (ANSYS). Finally, parametric studies were done regarding the geometric configuration of the receiver, the mass flow of the HTF and available heat in the absorbing surface. The results showed that 1.5% of the heat, in the receiver, loses due to radiation and convection effects, however, the majority heat losses are due to radiation effects on the absorber surface. Based on all the conditions that were taken, it was deduced that less than 34 meters of Fresnel receiver to obtain a thermal jump of 45 °C in the HTF, distance from which the fluid begins an evaporation process. The parametric studies showed that the parameter of major influence in the thermal behavior of these solar receivers is the mass flow rate of HTF into the transport pipelines, due to the heat transfer has exponential behavior