Ihe of use porous irsert constituted by a metal matrix of copper Raschig Rings is proposed here for parabolic trough solar collectors. The CFD analysis, based on a well-established numerical model, allows computing a significant increase in the thermal performance of the lube considered in the analysis, when equipped with the porous insert, with respect to a smooth pipe. The useful power grows up to -96 % of the absorbed incident power. A reduction of a factor of 5 in the radiative and convcctivc losses is computed, due to a large drop in the pipe surface temperature. The length of the porous insert, however, should be carefully evaluated in view of the significant additional pressure drop caused by the insert.
Improving the overall thermal performance of parabolic trough solar collectors using porous media
Cammi A.;
2021-01-01
Abstract
Ihe of use porous irsert constituted by a metal matrix of copper Raschig Rings is proposed here for parabolic trough solar collectors. The CFD analysis, based on a well-established numerical model, allows computing a significant increase in the thermal performance of the lube considered in the analysis, when equipped with the porous insert, with respect to a smooth pipe. The useful power grows up to -96 % of the absorbed incident power. A reduction of a factor of 5 in the radiative and convcctivc losses is computed, due to a large drop in the pipe surface temperature. The length of the porous insert, however, should be carefully evaluated in view of the significant additional pressure drop caused by the insert.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
