Experiment of temperature rising effect by heat release and storage with shallow water in solar greenhouse

In this study, the solar energy was used as heat source, the water was used as heat storage medium and the shallow soil in greenhouse was used for heat storage. The heat was collected and stored in shallow soil through water circulation during daytime, and the greenhouse temperature increased at night due to the soil heat releasing. The results showed that this method could increase the heat storage of greenhouse. The temperature difference of the experiment greenhouse and normal greenhouse began to increase after covered the insulation. The average air temperature in experiment greenhouse is 4.0℃ higher than in normal greenhouse. The soil temperature at 0, 30, 60 cm in the experiment greenhouse was 3.0℃, 3.0℃, 5.0℃ higher than in the normal greenhouse respectively. Therefore the method can not only increase the air temperature, but also increase the temperature of soil around crops.