It was indicated that the covering with low diffusion coefficient, small porosity and bad permeability was suitable to cover the pile.

扩散系数小、孔隙度低、渗透性差的材料适于做覆盖材料。

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Theoretical analysis using the method of energy equilibrium in covering layer and validation of the overall heat transfer coefficient of greenhouse covering materials;

进一步研究了在结霜过程中空气冷却器的传热面积、传热系数以及空气侧压降与霜层生长的变化关系。

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