导流板对穿孔式太阳能空气集热器性能的影响OA

In order to study the influence of perforated heat absorber plate and guide plate on heat transfer performance of solar air collector in single channel structure,a heat transfer enhancement structure with guide plate under the opening of heat absorber plate is designed in this paper.The effects of the height of the guide plate under the heat absorber plate,the opening ratio of the guide plate,the transverse arrangement spacing,the longitudinal arrangement spacing and the transverse and longitudinal ratio of the perforation on the heat transfer and flow characteristics of the collector are numerically analyzed.The optimal structural parameters of the comprehensive heat transfer coefficient were obtained by single factor analysis(h=1.0 mm,g=0.50,X/D=3.25,Y/D=2.60,e2/e1=0.32).In the flow range studied,the average Nusselt number on the surface of the heat absorbing plate with the optimal structure is 37.6％higher than that without the deflector structure,the friction coefficient is increased by 31.6％,and the average comprehensive heat transfer coefficient is increased by 20.3％.The maximum heat collection efficiency and effective efficiency are 80.1％and 75.6％,respectively,which are 6.8％and 51.3％higher than those of the solar air collector with perforated plate structure in the literature.Therefore,the installation of the guide plate on the perforated heat absorbing plate can effectively improve the comprehensive performance of the solar air collector.