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针对日光温室冬春季育苗温度低且传统加温设备能耗高的特点,设计基于毛细管网的日光温室苗床热水加温系统,并于冬季在河北省永清县对系统的加温效果进行实际测试。以无加温育苗区为对照,研究分析毛细管网加温对空气温度和基质温度的影响,探讨了隔热层在加温苗床中的作用。结果表明:毛细管网苗床加温可使育苗基质夜间温度平均值及最低值提高3.2~3.4℃和0.8~1.4℃;铺设聚苯板可使夜间基质温度平均值提高0.6℃;基质温度的最低值偏离度为0~9.4%,平均值为1.5%~2.5%。基于毛细管网的苗床加温系统可有效提高苗床局部温度环境且加温均匀,对幼苗长势一致提供有力保障。
In view of the characteristics of solar greenhouse seedling temperature in winter and spring is low and the energy consumption of traditional heating equipment is high, the hot water heating system based on capillary network in sunflower greenhouse is designed. In winter, the heating effect of the system is carried out in Yongqing County, Hebei Province test. The effect of capillary network heating on air temperature and matrix temperature was studied by using no-temperature nursery area, and the effect of thermal insulation layer in heating seedbed was discussed. The results showed that the capillary network seedbed heating can increase the mean nighttime temperature and the minimum value of nursery substrate by 3.2 ~ 3.4 ℃ and 0.8 ~ 1.4 ℃; laying polystyrene board can increase the average nighttime substrate temperature by 0.6 ℃; the lowest substrate temperature The deviations ranged from 0 to 9.4% with an average of 1.5% to 2.5%. Capillary network-based seedbed warming system can effectively improve the seedbed temperature and local warming uniform, the growth of seedlings to provide a strong guarantee.