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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2021, Vol. 55 Issue (12): 2260-2266    DOI: 10.3785/j.issn.1008-973X.2021.12.005
    
Enhancing solar chimney ventilation efficiency by insertion of transparent panel
Guo-qing HE(),Da LV
College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
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Abstract  

To enhance the thermal efficiency of solar chimneys, this work was conducted to investigate the enhancing effect of adding thermal boundary layers on the ventilation efficiency by inserting a glazing panel in the chimney channel. A 1.2 m tall, 0.4 m wide and 0.5 m deep solar chimney laboratory model was constructed. The ventilation enhancement was studied by comparing the stack flow rate before and after the insertion of a glazing panel in the chimney channel. The experiment was conducted in a relatively closed hall. The ambient wind influence was minimized with the use of a wind shield in front of the chimney inlet. Totally 7 tests were conducted and the ventilation flow was measured. The results showed that the flow rate was mainly affected by the heat absorbed by the absorbing plate. With the solar radiation almost same, the insertion of a common glazing panel in the chimney channel increased the stack flow rate by 5% to 9%. The results confirm that increasing the number thermal boundary layers is beneficial to the thermal efficiency of the chimney.

Key words： solar chimney      thermal boundary layers      transparent insertion panel      solar radiation      ventilation     
Received: 25 January 2021      Published: 31 December 2021
CLC:  TU 18  
Fund:  国家自然科学基金资助项目（51678518）
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Guo-qing HE
Da LV
Cite this article:

Guo-qing HE,Da LV. Enhancing solar chimney ventilation efficiency by insertion of transparent panel. Journal of ZheJiang University (Engineering Science), 2021, 55(12): 2260-2266.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2021.12.005     OR     https://www.zjujournals.com/eng/Y2021/V55/I12/2260


透明插板对太阳能烟囱通风的增强效应

为了提高太阳能烟囱的热效率，通过在烟囱内部增设构件，探究增加热边界层数量对烟囱通风的增强效应. 在高1.2 m 宽0.4 m 深0.5 m 的太阳能烟囱实验模型中，插入玻璃板，通过测量烟囱入口段流速的变化，研究透明插板对太阳能烟囱通风量的提高效果. 实验在相对封闭的大厅中进行，并在烟囱入口处布置挡风板以排除环境风速的干扰. 从10月到12月间，共获得7组实际太阳辐射下烟囱的通风量，包括内部有无插板的对比实验. 结果表明，烟囱流量主要与吸热板的得热量有关. 在太阳辐射强度几乎不变的情况下，插入1块普通玻璃板可使得烟囱通风量增加5%~9%. 实验结果证实，在烟囱通道内增加热边界层可以提高烟囱热效率.


关键词： 太阳能烟囱,  热边界层,  透明插板,  太阳辐射,  通风量 
Fig.1 Sketches of solar chimney model and measuring locations
Fig.2 Photos of solar chimney experiments to enhance ventilation efficiency using inserted panels
实验组 日期 插板情况 天气状况 ta/oC 风速仪
A 2019-10-03 过程中间插入预热玻璃板 晴，无云，少霾 22~32 Swema 03+
B 2019-10-31 过程中间插入预热玻璃板 晴，无云，少霾 11~24 TSI 9545
C 2019-11-14 无玻璃板 晴，无云，少霾 14~18 TSI 9545
D 2019-11-11 始终有玻璃板 晴，无云，少霾 12~22 TSI 9545
E 2019-11-19 始终有玻璃板 晴，无云，少霾 7~14 TSI 9545
F 2019-10-16 无玻璃板 多云 15~21 Swema 03+
G 2019-12-03 无玻璃板 晴，无云，少霾 1~11 TSI 9545
Tab.1 Experimental conditions for enhancing solar chimney effect by insertion of glazing panel
Fig.3 Temporal variations of solar irradiation, flow speed and temperature before and after insertion of glazing panel for A and B cases
Fig.4 Temporal variations of solar irradiation and flow speed for C, D, and E cases
时间段 实验组 热边界层
数目 		$\overline Q_{ {\rm{in} } }/W$ $\overline Q_{ {\rm{out} } }/W$ $\overline Q_{ {\rm{all} } }/W$ $\overline E$/
(W·m?2) 		$\overline V_{ {\rm{in} } }$/
(m·s?1) 		$R_{Q_{ {\rm{in} } } }^{\rm{C}}$/% $R_{ {{E} } }^{\rm{C} }$/% $R_{v_{ {\rm{in} } } }^{\rm{C} }$/% P
14:39—17:00 C 2 76.5 42.2 118.7 187.8 0.34 0 0 0 ?
D 4 72.0 32.9 104.9 166.0 0.34 ?5.8 ?11.6 1.6 <0.001
E 4 76.8 37.8 114.7 181.5 0.36 0.5 ?3.4 5.1 <0.001
14:39—15:20 C 2 121.5 72.5 193.9 306.9 0.34 0 0 0 ?
D 4 121.9 59.6 181.5 287.2 0.33 0.3 ?6.4 ?0.9 0.009
E 4 127.4 67.6 194.9 308.4 0.34 4.8 0.5 2.5 <0.001
15:20—16:20 C 2 96.4 50.0 146.4 231.7 0.37 0 0 0 ?
D 4 85.6 36.8 122.4 193.7 0.38 ?11.2 ?16.4 1.8 <0.001
E 4 95.4 43.9 139.3 220.4 0.39 ?1.1 ?4.9 4.1 <0.001
16:20—17:00 C 2 7.9 3.8 11.8 18.6 0.30 0 0 0 ?
D 4 7.6 3.0 10.6 16.8 0.31 ?4.6 ?9.6 3.7 <0.001
E 4 4.9 2.1 7.0 11.0 0.33 ?38.5 ?40.8 9.2 <0.001
Tab.2 Averaged heat absorption, vertical irradiation, and flow speed for each time period in cases C, D, and E
Fig.5 Comparison between heat fluxes inside channel and airflow velocity in case D with insertion
Fig.6 Temporal variations of irradiation, flow speed and temperature for F case
Fig.7 Temporal variations of temperature and flow speed for case G
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