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为了改善节能温室冬天植物栽培生产地温低 ,严重影响植物生长发育 ,影响温室生产产量和品质的问题。以数学模拟和回归实验相结合的方法 ,研究了温室土壤的太阳能蓄热加温系统。研究结果表明 :系统能有效的提高地温 ,减少地温的变化幅度 ;在以加热管形成的浅层土壤温度层和以蓄热管形成的深层土壤温度层之间具有一个过渡层 ,和其它层不一样 ,这个过渡层的温度是不随时间变化的 ;以 SAS软件拟合的非线性方程为基础的土壤温度场的数学模型的模拟结果与实验结果吻合较好 ;选用差分法计算的土壤热扩散率精确度高 ,符合实验及生产实际要求 ;由温室热平衡方程确定的太阳能集热器面积与温室种植面积的优化比例为 1∶ 5 ,经试验验证 ,在目前技术状态下 ,该比例能满足作物冬季生长对土壤温度的要求。总之 ,研究的太阳能蓄热系统实现了太阳能夏天贮冬天用、日间贮夜间用、晴天贮阴天用的目的 ,从而在不消耗任何二次能源的条件下 ,能满足温室作物的正常生长要求。
In order to improve the energy saving winter greenhouse plant cultivation and production of low temperature, seriously affecting the plant growth and development, affecting greenhouse production yield and quality issues. By combining the mathematical simulation and regression experiments, the solar thermal storage and warming system in greenhouse soil was studied. The results show that the system can effectively increase the ground temperature and reduce the variation of the ground temperature. There is a transition layer between the shallow soil temperature layer formed by the heating pipe and the deep soil temperature layer formed by the heat storage pipe, which is different from other layers , The temperature of this transitional layer does not change with time; the simulation results of the mathematical model of the soil temperature field based on the nonlinear equation fitted by SAS software are in good agreement with the experimental results; the accuracy of the soil thermal diffusivity calculated by the difference method is accurate High, in line with the experimental and production of the actual requirements; determined by the greenhouse heat balance equation solar collector area and the greenhouse acreage optimization ratio of 1: 5, the experimental verification, under the current state of technology, the proportion of crops to meet the winter growth Soil temperature requirements. In summary, the solar thermal storage system has been used to achieve the purpose of solar energy storage in summer, storage in the daytime and storage in cloudy days, and cloud storage in sunny days, so as to meet the requirement of normal growth of greenhouse crops without consuming any secondary energy .