Experimental study of radiation absorption by microchannels of varying aspect ratios

被引：5

作者：

Horvath, Julie A. ^{[1
]}

Webb, Rebecca N. ^{[1
]}

机构：

[1] Univ Colorado, Dept Mech & Aerosp Engn, Colorado Springs, CO 80918 USA

来源：

SOLAR ENERGY | 2011年 / 85卷 / 05期

关键词：

Concentrated solar collection; Heat collection element; Microchannels; Radiative heat transfer;

D O I：

10.1016/j.solener.2011.02.021

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

A linear solar concentrator produces electricity by using a mirror to focus sunlight on a fluid filled tube known as a heat collection element. The fluid inside the element is then used as a heat source for steam generation in a conventional steam turbine power plant. This study examined the effect of adding microstructures to the surface of a heat collection element to improve system efficiency. Four test pieces, one with a smooth surface and three with a microstructured surface were compared experimentally for a given energy input and five different flow rates ranging from 0.84 cm(3)/s to 2.5 cm(3)/s. Over the entire range of flow rates the microchannel test piece absorbed no less than 1.29 times the energy of the smooth test piece. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：1035 / 1040

页数：6

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