跟踪式复合抛物面聚光太阳能集热器光学性能模拟  

Simulation on optical performance of tracking compound parabolic concentrator solar collector

作　　者：王银峰[1] 张鑫[2] 陈海军[1] 朱跃钊[1] 

机构地区：[1]南京工业大学机械与动力工程学院,江苏省过程强化与新能源装备技术重点实验室,江苏南京211800 [2]浙江大学化学工程与生物工程学系,浙江杭州310000

出　　处：《南京工业大学学报（自然科学版）》2015年第5期53-60,共8页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家科技支撑计划(2014BAJ01B06);国家自然科学基金(51276086);江苏省“六大人才高峰”计划;江苏省普通高校研究生科研创新计划(CXLX13_410)

摘　　要：构建了聚光比为2.3的曲柄连杆跟踪式复合抛物面聚光（CPC）太阳能集热器。改进了太阳入射角模型,推导了太阳入射角公式,并建立了集热器的光学效率模型。分析了不同太阳入射角下CPC集热器的聚光行为,考察了春分、夏至、秋分和冬至日的太阳入射角变化规律,比较了不同放置方式和跟踪模式下CPC集热器的光学性能。模拟得到横向投影角（θt）是影响CPC集热器光学性能的主要因素,θt为-23.5°～23.5°时,入射角修正因子（IAM）达到0.95～1.14;跟踪可有效缩小θt,使CPC集热器均处于高效聚光状态。采用间歇跟踪即可获得较高的光学性能。对于该CPC集热器在南京地区采用南北放置三点间歇跟踪模式光学性能最佳,日均能量密度最大值约为1.122 k W/m^2,不同节气下的日均能量密度比南北放置连续跟踪时高5%,达到固定模式的1.86～2.37倍。A crank rod tracking compound parabolic concentrator（ TCPC） solar collector,with a concentration ratio of 2. 3,was developed. The solar incident angle model was improved and formulas for the solar incident angles were derived. The optical efficiency model of the compound parabolic concentrator（ CPC） collector was built as well. Concentration behaviors of the TCPC collector at different solar incident angles were analyzed. Change laws of the solar incident angles on the typical four solar terms were investigated. Optical performances of the TCPC collector in different ways of placement and tracking modes were compared. Results showed that the transversal projection angle（ θt） was the vital factor affecting the optical performance. When θtwas within the range of- 23. 5° and 23. 5°,the incident angle modifier（ IAM） with 0. 95-1. 14 was effectively lowered by the tracking method,thus providing ahigher concentration mode. Better optical performance was obtained only by the intermittent tracking mode. For the TCPC collector located in Nanjing region,the optimized optical performance occured in the south-north aligned three positions intermittent tracking mode,with a maximum value of daily average energy density of 1. 122 k W / m^2. The daily average energy density in different solar terms in this tracking mode was5% higher than that in continuous tracking mode,and was 1. 86-2. 37 times as that in the fixed mode.

关 键 词：跟踪式CPC 光学性能模拟 入射角修正因子 能流密度 间歇跟踪 

分 类 号：TK513[动力工程及工程热物理—热能工程]