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首页> 外文期刊>Solar Energy >Experimental investigation of thermal and moisture behaviors of wet and dry soils with buried capillary heating system
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Experimental investigation of thermal and moisture behaviors of wet and dry soils with buried capillary heating system

机译：埋入式毛细管加热系统对干湿土壤热湿特性的实验研究

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摘要

An experimental study of thermal and moisture behaviors of dry and wet soils heated by buried capillary plaits was done. This study was carried out on a prototype similar to an agricultural tunnel greenhouse. The experimental procedure consisted on three different measuring phases distinguished by three different operational conditions of the capillary plaits: heating at 70℃, heating at 40℃ and without heating in summer. During an experimental run, quantities measured are soil temperature, soil water content at various depths, soil surface heat flux, solar radiation under the plastic cover, internal relative humidity, internal and external air temperature. In unsaturated moist soils, the transport of heat is complicated by the fact that heat and mass transfer is a coupled process. During the daily soil temperature variation, it was found that the surface temperature amplitude was higher in wet soil than in dry soil. The water content increased during daytime and decreased during nighttime. The diurnal variation amplitude of water content was higher without underground heating and decreased with the buried heat source temperature.
机译：进行了通过埋入毛细褶辫加热的干湿土壤的热和湿行为的实验研究。这项研究是在类似于农业隧道温室的原型上进行的。实验程序包括三个不同的测量阶段，以三个不同的毛细管褶皱操作条件为特征：加热70℃，加热40℃和夏天不加热。在实验过程中，测得的量为土壤温度，不同深度的土壤水分，土壤表面热通量，塑料覆盖层下的太阳辐射，内部相对湿度，内部和外部空气温度。在不饱和潮湿的土壤中，传热和传质是一个耦合过程，因此使热量的传输变得复杂。在每天的土壤温度变化过程中，发现湿土壤的表面温度幅度高于干土壤。白天水含量增加，夜间水含量减少。在没有地下加热的情况下，水分的日变化幅度较大，而随着埋藏的热源温度的降低，水分的昼夜变化幅度减小。

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