日光温室保温板外置复合墙体的温度特性

Temperature Characteristics of North Wall Covered by Polystyrene Plate Outside Solar Greenhouse

为了研究日光温室墙体的保温性能,试验设置了四种复合墙体,墙体的结构从内到外分别为：24 cm红砖（W1）、24 cm红砖＋3.3 cm聚苯烯板（W2）、12 cm红砖＋22 cm粘土＋2 cm聚苯烯板＋12 cm红砖（W3）、12 cm红砖＋24 cm粘土＋12 cm红砖（W4）。通过观测墙体内部温度和墙体表面以及距墙表15 cm处的气温,发现不同复合墙体的保温性能不同。在冬季12月份,墙体内部5-20 cm夜间平均温度W2比W1高3.5℃,墙体表面夜间温度W2比W1高1.5℃,不同层次的最高、最低温度以及不同时刻的温度,W2均明显高于W1,说明24 cm红砖＋3.3 cm聚苯烯板墙体的保温性明显好于24 cm红砖墙。W2与W3和W4相比,最高温度、最低温度、平均温度以及不同时刻的温度变化差异不太明显,说明24 cm红砖＋3.3 cm聚苯烯板墙体的保温效果与50 cm墙体的保温效果接近。

In order to understand the heat-retaining properties of north wall in a solar greenhouse, the experiments were carried out with four different walls. They were constructed from internal to external： 24 cm red brick wall （W1）, 24 cm red brick wall plus 3.3 cm polystyrene plate wall （W2）, 12 cm red brick ＋ 22 cm clay ＋ 2 cm polystyrene plate ＋ 12 cm red brick wall （W3）, and 12 cm red brick ＋ 24 cm clay ＋ 12 em red brick wall （W4）. The results showed that the average wall temperature within 5-20 cm of W2 was 3.5 ℃ higher than that of W1. The surface temperature of W2 inside the greenhouse was 1.5 ℃ higher than that of W1. Furthermore, the maximum and minimum temperature, the temperature at any time in different depths of W2 was also higher thafi that of Wl. The results sug- gested that the heat-retaining properties of the wall with 24 cm red brick covered by 3.3 cm polystyrene plate was much better than that of 24 cm red brick wall. Compared W2 with W3 and W4, it was found that the temperature discrepancy was not too great. The heat-retaining properties of wall with 24 cm red brick wall ＋ 3.3 cm polystyrene plate was nearly the same as the wall with 50 cm thickness.