基于毛细管网的日光温室苗床加温系统研究
Design and test of seedbed heating system based on capillary network in solar greenhouse

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。
Aiming at the problems of low local temperature of seedbed and high energy consumption of traditional heating system in winter and spring in solar greenhouse,a novel seedbed heating system based on capillary network was put forwarded.The experiment was carried out to test the seedbed heating system effect in the solar greenhouse during the winter of Hebei Province.Taking the seeding area without heating as the control,the effects of heating on air temperature and substrate temperature were analyzed and the heating energy-saving effect of insulation layer was investigated.The results showed that the average and the minimum of night substrate temperature in heating area were 3.2-3.4℃ and 0.8-1.4℃ higher than in the compared area without heating,respectively.The insulation layer raised the average of night substrate temperature by 0.6℃.Meanwhile,the minimum deviation degree of substrate temperature was 0-9.4%,and the average was 1.5%-2.5%.In conclusion,the seedbed heating system based on capillary network can significantly raise the seedbed local temperature and has good heating uniformity,which guarantees the consistent growth of seedling.