基于三角形腔体的菲涅尔线聚焦集热系统研究

RESEARCH ON FRESNEL LINE CONCERNTRATING HEAT COLLECTION SYSTEM BASED ON TRIANGULAR CAVITY RECEIVER

该文设计一种基于三角形腔体的菲涅尔线聚焦集热系统,通过搭建测试平台,在实际天气条件下测试腔体有无盖板、腔体内铜管表面有无覆盖黑漆和太阳直射辐照度等因素对腔体出口温度及系统集热效率的影响。研究结果表明:光洁铜管腔体增加盖板后,集热效率由22.10%增加至25.82%;而黑漆铜管腔体增加盖板后,系统集热效率由30.40%下降至29.50%。光洁铜管表面覆盖黑漆后,腔体无盖板情况下的系统集热效率由21.94%增加至34.57%;腔体有盖板情况下的系统集热效率由25.26%增加至29.91%。太阳直射辐照度对腔体出口温度波动影响显著,但对系统集热效率的影响不明显。

This article designs a Fresnel line concentrating heat collection system based on a triangular cavity receiver,by building a testing platform,the impact of several factors such as with or without a transparent cover on the cavity,the presence or absence of black paint on the surface of the copper tube inside the cavity,and direct solar irradiance on the outlet temperature of the cavity and the heat collection efficiency of system under actual weather conditions are tested.The research results show that after adding a transparent cover to the smooth copper tube cavity,the heat collection efficiency of system increases from 22.10%to 25.82%.After adding a transparent cover to the black-painted copper tube cavity,the heat collection efficiency of system decreased from 30.40%to 29.50%.After covering the surface of the smooth copper tube with black paint,the system’s heat collection efficiency without a transparent cover in the cavity increases from 21.94%to 34.57%.The heat collection efficiency of the system with a transparent cover in the cavity increased from 25.26%to 29.91%.The direct solar irradiance has a significant impact on the temperature fluctuation at the outlet of the cavity,but its impact on the heat collection efficiency of system is not significant.