近年来,以空气作为换热介质的太阳能集热器越来越受到重视。本文以微热管阵列为核心传热元件,设计并搭建了改进型微热管平板太阳能空气集热器性能测试系统。通过实验研究了不同空气流量和不同进口温度对集热器集热性能的影响,获得相应参量对集热器的出口空气温度、集热效率和微热管阵列蒸发段温度的影响特性,分析对比了改进前后集热器的集热性能,得到了集热器效率的归一化曲线。实验结果表明,改进型微热管平板太阳能空气集热器在夏季240 m3/h空气流量时集热性能最佳,改进后的集热器相比原集热器在夏季的平均集热效率最高同比提升13.8%;在240 m3/h风量下的平均集热效率最高达到了74%,对应集热器的压降为9.2 Pa。
In recent years, solar collectors which adopt air as a heat transfer fluid have received increasing attention. A new type of flat plate solar air collector was designed and constructed by taking micro-heat pipe array as the core heat transfer element in this work. The effects of different air flow rates and different inlet temperatures on the heat collecting performance of the collector were analyzed through experimental methods. Then, the influence characteristics of the corresponding parameters on the outlet temperature, the heat collection efficiency and the temperature of the evaporation section of the micro-heat pipe array were obtained, and the normalized curve of the collector efficiency was obtained according to the experimental data. The results showed that a best heat collecting performance of the improved micro heat pipe flat solar air collector was reached at 240 m3/h air flow in summer, and the average collector efficiency of the improved collector was 13.8% higher than that of the original collector in summer. The average heat collection efficiency at 240 m3/h was up to 74%, and the pressure drop corresponding to the collector was 9.2 Pa.
[1] GHOSAL M K, TIWARI G N, DAS D K, et al.Modeling and comparative thermal performance of ground air collector and earth air heat exchanger for heating of greenhouse[J]. Energy and buildings, 2005, 37(6): 613-621. DOI: 10.1016/j.enbuild.2004.09.004.
[2] 胡灯运, 何伟, 张世超, 等. 太阳能-空气源热泵联合干燥系统设计及干燥枸杞的实验研究[J]. 新能源进展, 2018, 6(2): 83-89. DOI: 10.3969/j.issn.2095-560X.2018. 02.001.
[3] 姚远, 廉永旺, 王显龙, 等. 太阳能-热泵联合茶叶烘焙装置的创新设计与实验研究[J]. 新能源进展, 2017, 5(1): 47-55. DOI: 10.3969/j.issn.2095-560X.2017.01.007.
[4] 李洪勇, 鹿刘新, 芦莉, 等. 太阳能空气集热器在海水淡化中的应用[J]. 太阳能, 2010(1): 32-33. DOI: 10.3969/j.issn.1003-0417.2010.01.010.
[5] 孙峙峰, 曲世琳. 太阳能空气集热器热性能测试方法研究[J]. 太阳能学报, 2011, 32(11): 1657-1661.
[6] AKPINAR E K, KOÇYIğIT F. Energy and exergy analysis of a new flat-plate solar air heater having different obstacles on absorber plates[J]. Applied energy, 2010, 87(11): 3438-3450. DOI: 10.1016/j.apenergy.2010.05.017.
[7] TANDA G.Performance of solar air heater ducts with different types of ribs on the absorber plate[J]. Energy, 2011, 36(11): 6651-6660. DOI: 10.1016/j.energy.2011.08.043.
[8] EL-SEBAII A A, ABOUL-ENEIN S, RAMADAN M R I, et al. Thermal performance investigation of double pass-finned plate solar air heater[J]. Applied energy, 2011, 88(5): 1727-1739. DOI: 10.1016/j.apenergy.2010.11.017.
[9] 程友良, 杨国宁, 王月坤. 太阳能空气集热器吸热板结构优化及其数值模拟[J]. 可再生能源, 2016, 34(7): 949-954. DOI: 10.13941/j.cnki.21-1469/tk.2016.07.001.
[10] 颜军, 刘晓娟, 吕坤. 圆柱阵列太阳能空气集热器的实验研究[J]. 能源技术, 2004, 25(5): 191-193. DOI: 10.3969/j.issn.1005-7439.2004.05.003.
[11] 王林军, 高章维, 张东, 等. 平板型双流道太阳能空气集热器热性能研究[J]. 太阳能学报, 2016, 37(10): 2562-2568. DOI: 10.3969/j.issn.0254-0096.2016.10.017.
[12] 朱婷婷, 刁彦华, 赵耀华, 等. 微热管阵列式太阳能平板空气集热器集热性能[J]. 农业工程学报, 2016, 32(11): 250-257.
[13] 刘亚柯. 平板型太阳能集热器空气夹层对流换热数值模拟与实测分析[D]. 西安: 西安建筑科技大学, 2011. DOI: 10.7666/d.d191893.
[14] ROMDHANE B S.The air solar collectors: comparative study, introduction of baffles to favor the heat transfer[J]. Solar energy, 2007, 81(1): 139-149. DOI: 10.1016/j. solener.2006.05.002.
[15] 中华人民共和国住房和城乡建设部. 太阳能供热采暖工程技术规范: GB 50495-2009[M]. 北京: 中国建筑工业出版社, 2009.
