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| Analysis of Winter Temperature Traits in Common Solar Greenhouse in Beijing Areas |
| LIU Si-ying，DAI Xi-nan，HUANG Long，XIE Xiao-lu，GAO Li-hong，QU Mei |
| College of Agronomy and Biotechnology，China Agricultural University，Beijing 100193，China |
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Abstract This experiment used 4 common types of solar greenhouse as targets．Their back wall materials from the inside to outside are 37 cm brick+10 cm polyphony board+24 cm brick，20 cm ceramic brick+10 cm perlite+20 cm ceramic brick，Shouguang type loam wall，37 cm brick+12 cm polyphony board，respectively．According to the structure parameters and building materials of these 4 types solar greenhouses，we analyzed their lighting angle and heat preservation functions，and measured the indoor and outdoor temperatures of the solar greenhouses in winter of 2010-2011．The results showed that the temperature of Beijing in winter of 2010-2011 is normal but leaning to cold．Thermal resistance of the greenhouse with 37 cm brick+10 cm polyphony board+24 cm brick back wall is 3.41 m2 K W-1．The average indoor temperature is 14.4 ℃．The average night temperature is above 10 ℃．The lowest temperature is above 6 ℃．The average temperature inside of Shouguang type greenhouse is 12.4 ℃．The average temperature at night is above 8.4 ℃．The lowest temperature is above 4.6 ℃．These 2 types of solar greenhouses can ensure the fruit vegetables production in winter．Greenhouses with 20 cm ceramic brick+10 cm perlite+20 cm ceramic brick and 37 cm brick+12 cm polyphony have lower indoor temperatures．The lowest temperature is around 0 ℃．The average temperature at night is between 5-7 ℃．They are only good for cultivating cold-tolerant leaf vegetables in winter.
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Received: 03 August 2011
Published: 11 October 2011
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