Study on a New Type of Assembled Energy-Saving Sunlight Greenhouse in Winter Temperature Effect

In Heilongjiang province, because of solar greenhouse in winter night temperature is too low, so it is difficult to meet the needs of crop growth. A new assembled energy-saving solar greenhouse was introduced into Daqing city, the heat storage of water circulation system and air-ground heat storage in the heat exchange system were designed in the greenhouse.Taking the common greenhouse in Daqing city as comparison, in the coldest winter period, the indoor temperature change and distribution of new-type and common greenhouse in the east and west, north and south direction were detected, also the soil temperature changes and distribution of different soil layer and north-south direction were directed. The results showed that, the indoor temperature could be kept above 12 ℃ at night, with uniform temperature distribution,compared with the common greenhouse, temperature increased by 2 ~3 ℃. The temperature was higher than the conmmon greenhouse for the new-type greenhouse in region of soil depth above 60 cm, the night mean temperature difference of 10,30 and 60 cm soil depth were 5.7,4.0 and 2.7 ℃, respectively. Therefore, the new type of greenhouse not only can improve the temperature inside the greenhouse, but also boost the soil temperature of crop roots.