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作 者:佟国红[1] 李保明[1] David M.Christopher 山口智治[3]
机构地区:[1]中国农业大学农业部设施农业生物环境工程重点开放实验室 [2]清华大学热能工程系,北京100084 [3]日本筑波大学农林工学系
出 处:《农业工程学报》2007年第7期178-185,共8页Transactions of the Chinese Society of Agricultural Engineering
基 金:北京市教育委员会共建项目建设计划资助(XK100190550)
摘 要:日光温室温度环境为一动态变化过程,该文建立了求解晴天室内温度环境的计算模型。将室外的水平面太阳辐照度、天空辐射温度、室外空气相对湿度、空气温度、风速及室内1.0m深土壤温度作为边界条件,采用计算流体动力学技术(CFD)中的非稳态方法求解控制方程,模拟了晴天室内温度随外界气候条件的变化,结果显示模拟得到的室内空气温度及土壤温度变化规律与实测值变化规律相同,盖帘后室内空气温度及土壤0.2 m深土层的温度模拟值与实测值相差约在1℃以内;探讨了边界条件中冷风渗透、土壤表面太阳能转换显热份额及1.0 m深土壤温度的取值变化对室内温度的影响。日光温室内温度动态变化模拟模型的建立对优化温室设计参数和预测不同天气情况下室内的温度环境变化具有参考意义。Temperatures inside a solar greenhouse vary dynamically throughout the day. A calculation model for temperatures inside greenhouses during a clear day was established in this paper. The boundary conditions were based on solar radiation, sky radiative temperature, external air temperatures, relative humidity, wind velocities and soil temperature at 1.0 m deep inside. Conservation equations were solved using unsteady simulations by Computational Fluid Dynamics technique(CFD) and temperatures inside a solar greenhouse during a clear day were simulated in time and in space. The results show that the simulated air and soil temperatures have the same pattern with the measured ones with the differences between the simulated air temperatures during the night and soil temperatures at 0.2 m deep and the measured values being no more than 1.0℃. The influence of the cold air infiltration, the heat source on the soil surface due to the solar radiation, and the soil temperatures at a depth of 1.0 m on interior temperatures were also discussed in this paper. The model can help to select suitable solar greenhouse design before the construction and to predict inner temperatures for different climatic conditions outside.
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