GUO Jianxuan,YANG Huijun,GUAN Yong,et al.The Structural Optimization and Its Application of the Double-tube Multi-curved Trough Air Collector for Solar Greenhouse in Lanzhou[J].Northern Horticulture,2020,44(07):65-72.[doi:10.11937/bfyy.20193257]
兰州地区日光温室用双管多曲面槽式空气集热器结构优化及其应用
- Title:
- The Structural Optimization and Its Application of the Double-tube Multi-curved Trough Air Collector for Solar Greenhouse in Lanzhou
- 关键词:
- 日光温室; 双管多曲面槽式集热器; 结构优化; 正交实验; 工程应用
- Keywords:
- solar greenhouse; double-tube multi-curved trough collector; structural optimization; orthogonal experiment; engineering application
- 文献标志码:
- A
- 摘要:
- 以双管多曲面槽式空气集热器为试验对象，采用蒙特卡罗光线追踪法对不同结构参数的集热器进行光线追踪，结合信噪比分析得到较优结构的集热器，以期达到最大的光线汇聚率，并与兰州地区的日光温室太阳能主被动协同蓄热供热墙体相结合构成主动集〖JP+2〗热系统，考查其应用效果。结果表明：当集热器在进光口宽度为670 mm，出光口宽度为210 mm，集热器总高度为545 mm，二次反射平面镜高度为40 mm时，光线汇聚率在太阳入射角为0°~7°时可达到100%。工程试验结果显示，若日累计太阳辐射强度为19 MJ·m-2，室外平均环境温度为1.8 ℃时，总长10 m且管内空气流速为1.67 m·s-1的集热系统可获得2 115 W的瞬时集热量和35.7%的最大瞬时集热效率。并统计出该集热系统在冬季晴天实测的28 d里累计集热量为633 MJ。该研究结果可为双管多曲面槽式空气集热器优化设计及其实际应用提供参考依据。
- Abstract:
- In order to achieve the maximum light convergence rate of the double-tube multi-curved trough air collector,the Monte Carlo ray tracing method was used to ray trace the collectors with different structural parameters,and the signal-to-noise ratio analysis was also used to obtain the optimal structured collector,meanwhile,its heat collecting performances combined with the solar energy active-passive heat storage heating wall of the solar greenhouse in Lanzhou to form an active heat collecting system were examined.The results showed that when the width of the light collector was 670 mm,the width of the light outlet was 210 mm,the total height of the collector was 545 mm,and the height of the secondary reflecting plane mirror was 40 mm,the heat source convergence rate of the double-tube multi-curved trough air collector could reach 100% at the solar incident angle of 0° to 7°.The engineering test results showed that if the cumulative solar radiation intensity was 19 MJ·m-2 and its average outdoor temperature was 1.8 ℃,the collector system with the total length of 10 m and the air velocity of 1.67 m·s-1 in the double tube could obtain 2 115 W for the instantaneous heat collection capacity,and the instantaneous heat collection efficiency was 35.7%,and it was calculated that the accumulated heat collected by the heat collection system in 28 days of winter sunny days was 633 MJ.The results could provide a reference for the optimal design of double-tube multi-curved trough air collector and its practical application.
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备注/Memo
第一作者简介：郭建璇(1994-)，女，硕士研究生，研究方向为太阳能热利用技术。E-mail：609426087@qq.com.责任作者：管勇(1976-)，男，博士，副教授，硕士生导师，现主要从事建筑节能及设施农业热湿环境调控技术等研究工作。E-mail：guany2004@mail.lzjtu.cn.基金项目：国家自然科学基金资助项目(51866006,51868035,51468028)；甘肃省科技计划资助项目(18JR3RA121)；兰州交通大学百名青年优秀人才培养计划基金资助项目。收稿日期：2019-11-18