A novel study on spectral division and photothermal regulation in Chinese solar greenhouse derive from nanofluid

Xiaosong Qu, Hao Liang, Gang Wu, Chaoqing Feng, Yi Zhang, Zhikang Liu, Guanghao Yuan and Yunrui Hai

Energy, 2024, vol. 313, issue C

Abstract: Chinese Solar Greenhouse (CSG) is a unique greenhouse structure mainly in northern China. Due to the obstruction of crops and CSG structures, as well as the heat storage characteristics of the north wall of the CSG, the light intensity in the north crop area is lower than that on the south side during the day, and the indoor temperature is lower at night. To improve the above phenomenon, this study proposes an Active Heat Storage and Release System (AHS) composed of Frequency Division Complement Structure (FDCS) suspended on the surface of the north wall that can directly absorb infrared light. At room temperature, when selecting an ATO-WO3/H2O nanofluid with an optical path of 10 mm and a volume fraction of 0.005 %, the average absorption rate of the structure for NIR is 85.4 %, and the average reflectivity for VIS is 75.7 %. It has been verified that on clear winter days, the northern wall area can be illuminated by direct sunlight in the height direction. During the experiment, the heat collection area of the structure was approximately 7.2 m2. FDCS provides reflective supplementary light for crops in the greenhouse; The average cultivation area covered by morning light is 19.6 m2 and the maximum accumulated energy on the ground increased by more than 4 MJ throughout the day. Compared with the control area, the Photosynthetic Photon Flux Density (PPFD) of crops in the experimental area increased by an average of 99.1 and 72.8 μmol m−2 s−1 for red and blue light, respectively. The average increase in plant growth factors was 21.5 %, and the uneven distribution of light in the canopy of crops in the north and south was improved and tended to remain stable. After FDCS was turned on, the average nighttime greenhouse temperature increased by 1.4–1.9 °C, with a daily average heat collection of 16.31 MJ and a nighttime average heat release of 10.42 MJ. The average optical efficiency was 40.4 %, and the daily average heat collection efficiency was 26.7 %.

Keywords: Chinese solar greenhouse; Spectral division; Solar collectors; Nanofluid; Plant (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:313:y:2024:i:c:s0360544224035825

DOI: 10.1016/j.energy.2024.133804

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