The Numerical Simulation of Thermal Environment of Strawberry Greenhouse in Natural Ventilation

Abstract

The method of numerical simulation was adopted in this study to explore the size of the natural ventilation inlet opening, outdoor temperature and ambient wind speed and other environmental parameters to effect of the varied rules of thermal environment of the strawberry solar greenhouse. The variation of outdoor air temperature effected greatly to the indoor thermal environment, the average air velocity in the strawberry growing zoon within the greenhouse was rose initially and dropped tend to the steady with increasing outdoor air temperature. The average temperature in the strawberry growing zoon was decreased with increasing the outside wind speed. The average air velocity was increased gradually in the strawberry growing zoon within the greenhouse with increasing outdoor wind speed. The average velocity was reduced gradually toward to constant.

CFD Simulation Study on the Cooling Characteristics of Shading and Natural Ventilation in Greenhouse of a Botanical Garden in Shanghai

“…Meanwhile, when the outdoor comprehensive temperature is high, the excessive solar radiation heat must be controlled to ensure that the growing environment is not overheated. Natural ventilation is an effective way to eliminate overheating in greenhouses [2][3][4][5], but with the increase in outdoor temperature and solar radiation intensity, when the natural ventilation cannot eliminate the excessive heat gain from solar radiation, shading is the most commonly used cooling method in a greenhouse to further cool down the greenhouse [6][7][8]. Considering that plants usually need sunlight for photosynthesis, shading is usually the second option for cooling a greenhouse, except for some shade-loving plants, and the first option when the greenhouse overheat occurs is to employ opening on the envelope to bring outdoor air in.…”