CFD Analysis of Solar Greenhouse Thermal and Humidity Environment Considering Soil–Crop–Back Wall Interactions

Changqing Si, Fei Qi, Xiaoming Ding, Fen He (), Zhenjun Gao (), Qian Feng and Liang Zheng
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Changqing Si: College of Mechanical and Power Engineering, China Three Gorges University, Yichang 443002, China
Fei Qi: Key Laboratory of Farm Building in Structure and Intelligent Construction, Ministry of Agriculture Rural Affairs, Beijing 100125, China
Xiaoming Ding: Key Laboratory of Farm Building in Structure and Intelligent Construction, Ministry of Agriculture Rural Affairs, Beijing 100125, China
Fen He: Key Laboratory of Farm Building in Structure and Intelligent Construction, Ministry of Agriculture Rural Affairs, Beijing 100125, China
Zhenjun Gao: College of Mechanical and Power Engineering, China Three Gorges University, Yichang 443002, China
Qian Feng: Key Laboratory of Farm Building in Structure and Intelligent Construction, Ministry of Agriculture Rural Affairs, Beijing 100125, China
Liang Zheng: College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China

Energies, 2023, vol. 16, issue 5, 1-20

Abstract: In the study of solar greenhouses, microclimate, soil, and back walls have an important influence on the greenhouse thermal environment because of their good heat storage and release characteristics. The transpiration of crops makes indoor humidity increase sharply, which is the main factor affecting indoor humidity distribution. Therefore, it is of great significance to grasp the microclimate change law of solar greenhouses and study the coupling effect of thermal and humidity environment. In this paper, based on computational fluid dynamics (CFD), a three-dimensional model of the thermal and humidity environment of a solar greenhouse is established, and the indoor temperature and humidity distribution under the influence of soil, crops, and back walls are considered. The CFD model initialization uses binary fitting functions to fit the temperature distribution of soil, back wall, and air. The distribution law of the temperature field and relative humidity field of the solar greenhouse under three different working conditions is simulated, that is, the insulation is uncovered and the ventilation window is closed during the day (G1), the insulation is uncovered and the ventilation window is opened during the day (G2), and the insulation is put down and the ventilation window is closed at night. (G3). The results show that the simulation results are in good agreement with the actual results under the three working conditions, and this paper can provide a reference for the improvement of the greenhouse structure and environmental regulation.

Keywords: solar greenhouse; thermal and humidity environment; CFD; microclimate (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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