Temperature Contrast Test of Various Types of Solar Greenhouses in Suburbs of Beijing City

In order to further optimize structure of solar greenhouse in Miyun District of Beijing and improve temperature of facility shed，based on three existing solar greenhouses in Miyun District，including active heat storage solar greenhouse（G1），sunken solar greenhouse（G2）and local traditional solar greenhouse（G3），using temperature data of microclimate comprehensive observer，temperature changes of three kinds of solar greenhouses in growing season under different weather conditions were compared and analyzed.Results showed that：undet condition of long cycle，nighttime average temperatures of G1，G2 and G3 were 14.66，10.21 and 8.37 ℃ respectively; under condition of short cycle，nighttime average temperatures of G1，G2 and G3 were 15.84，11.08 and 9.49 ℃ respectively; under extreme low temperature conditions，nighttime average temperatures of G1，G2 and G3 were 10.63，7.54 and 6.24 ℃ respectively; under typical sunny conditions，average night temperatures of three greenhouses were 17.83，11.48 and 9.16 ℃ respectively; under typical cloudy conditions，nighttime average temperatures of three greenhouses were 9.64，7.03 and 6.04 ℃ respectively.G1 solar greenhouse was better than G2 and G3 solar greenhouse as a whole.It showed good thermal insulation and temperature storage performance under extreme low temperature and typical cloudy conditions，and could meet growth of indoor crops at low temperature.Therefore，active heat storage solar greenhouse has good popularization value in Miyun District of Beijing.