A greenhouse is a plastic or glass structure that can provide a suitable micro-climate for various crops and plants, protecting them from severe and variable outdoor weather conditions. During the daytime with intense solar radiation, the greenhouse effect caused by the absorption of solar radiation makes the temperature inside the greenhouse even higher than the ambient temperature; thus, plants and crops may suffer being dried due to high rate of evapotranspiration caused by the excessive heat, and their production may decline. To provide a suitable growing environment, cooling technologies are essential and must be introduced.It plays a vital role in the greenhouse industry especially in hot weather although it is still important in any other climate
conditions. The climate of Shanghai is humid subtropical and features hot, humid summers and chilly, damp winters. Table 1 shows the typical variation in climate conditions in Shanghai. Summer sees high temperature that plants and crops cannot endure; as a result, air cooling technology is urgently required. Over the past decades, many relevant studies and experiments of greenhouse cooling technologies have been conducted throughout the world. The method of computational fluid dynamics
(CFD)and TRNSYS are applied to study the energy