In order to adjust the balance of solar radiant energy utilization in greenhouse, In this paper, vertical heat exchange tubes are used as heat exchange devices to transfer the surplus solar radiant energy in the daytime to underground soil for storage, and release part of energy stored in underground soil through heat exchange tube to raise air temperature in greenhouse at night, and the rest of energy is stored in underground soil. The experiment was carried out in the new energy experimental demonstration base in Inner Mongolia, and two greenhouses with the same size were constructed, which were recorded as the experimental group and the control group, respectively, without crops. The experimental results showed that during the nine-day experiment, compared with the control group, the temperature of the experimental group at different positions in the night shed increased to varying degrees, and the maximum air temperature in the shed increased by 3.2 ℃. the maximum increase of surface temperature was 4.4 ℃; The maximum temperature at 10 cm underground increased by 3.3 ℃, the maximum temperature at 30 cm underground increased by 1.2 ℃, and the maximum temperature at 50 cm underground increased by 1.0 ℃. The experiment achieved the expected effect of reasonable distribution and application of solar radiation energy by using heat exchange tubes, strengthened the day energy storage and night energy release of soil, and stored the solar radiation energy rich in underground soil to improve soil temperature, which provided a new way for the regulation of thermal environment in greenhouses.
Key words
heat exchangers-tubes /
greenhouse /
temperature distribution /
soil heat storage /
solar energy
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