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| DOI： |
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| Numerical Simulation of Temperature and Humidity Distributions in a Solar Greenhouse |
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GAO Jie, ZHENG Decong
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Shanxi Agricultural University, Jinzhong 030800, China
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| Abstract: |
| This paper simulated numerically the distributions of temperature and humidity in a solar greenhouse in Jinzhong district, Shanxi province under natural ventilation in sunny days, using a CFD-based model. Plant in the greenhouse was irrigated using furrows and the spatio-temporal distributions of temperature and humidity in it were measured. The results showed that during sunny days in winter, the indoor-humidity and temperature in the greenhouse peaked around 08:00 am and 14:00 pm respectively. The indoor-humidity and temperature were negatively correlated, and when the temperature rose by 1 ℃, the humidity decreased by 3.31%. The discrepancy between the measured and simulated temperatures was within ±3 ℃, and the errors of the simulated humidity was less than 6.8% in comparison with the measurements. The gradients of humidity and temperature in the north-south direction and the east-west direction were similar, while in the vertical direction the heterogeneous effect was significant. The energy of the solar radiation could meet the demands when the greenhouse was insulated by woven straws, and there was no need to heat the greenhouse. However, the humidity in the greenhouse was relatively high in nights, close to saturation, requiring control. |
| Key words: solar greenhouse; humidity; numerical simulation; CFD |
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