Solar greenhouse local cooling system and cooling method based thereon

The invention belongs to the field of greenhouse environment facilities and particularly relates to a solar greenhouse local cooling system and a cooling method based thereon. The system comprises an air cooler, a pipeline system and a lifting system; the air cooler is mounted on the outer side of a rear wall of a greenhouse, and the pipeline system and the lifting system are arranged in the solar greenhouse; a main pipeline of the pipeline system is connected to an air outlet of the air cooler, and a plurality of horizontal branch pipelines of the pipeline system are connected to the main pipeline through vertical telescopic pipes; the lifting system drives the horizontal branch pipelines to lift vertically; the horizontal branch pipelines are provided with air ports. When greenhouse internal proper temperature cannot maintained through the normal ventilation, the air cooler and pipeline parameters are determined according to the cooling requirements; the air cooler operates, the heights of the horizontal branch pipelines are adjusted according to those of plants, and the optimal cooling effect is maintained. The system has the advantages that plant canopy upper local environmental temperature can be decreased effectively, the temperature gradient is small, the energy consumption is small, and the production time of the greenhouse in summer can be prolonged.