摘要：The objective of the study is to investigate and optimize the solar flux uniformity of a fixed linear-focus Fresnel lens solar concentrator using a triangle cavity receiver. The effects of receiver parameters including the vertical distance from the cavity opening plane to the Fresnel lens <i>f</i>, receiver internal surface absorptivity <i>α<sub>ab</sub></i>, end reflection plane reflectivity <i>ρ<sub>r</sub></i>, solar declination angle <i>δ</i> and solar angle <i>ω</i> on the uniformity factor (<i>UF</i>) of a triangle cavity receiver were carried out. The effects of receiver parameters are evaluated with a significance test of critical factors. The results showed that the increase in <i>f</i> and <i>δ</i> would result in an increase in the <i>UF</i>. The average <i>UF</i> with <i>f</i> = 600, 625, 650, 675 and 700 mm, respectively, are 0.5030, 0.5858, 0.6337, 0.6576 and 0.6784 for <i>ω</i> in range of 0–60°. Moreover, the <i>UF</i> increases as <i>α<sub>ab</sub></i> decreases when other receiver parameters are constant for the <i>δ</i> of 0–8°. The <i>ρ<sub>r</sub></i> has a limited effect on the <i>UF</i> until <i>δ</i> becomes relatively larger and <i>ω</i> becomes relatively smaller. Furthermore, <i>ω</i> effects are most significant on the <i>UF</i>, followed by <i>δ</i>, <i>f</i> and <i>α<sub>ab</sub></i>. Setting a suitable <i>f</i> is the most economical and effective way to improve the <i>UF</i>.
