A quasi-three-dimensional model was developed to simulate earth-to-air heat exchange process in undergroundduct system(UDS), which ignores heat transfer in the earth in the direction of air flow.
提出准三维土壤—空气传热传质模型，对地道通风系统内空气与土壤之间的热物理过程进行数值模拟。
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Presents the design of a no-duct inductive ventilation system for an underground park. Compares the advantages and disadvantages of this system to the conventional system.
Two other cables from the receiving equipment drop in trunking in the central service duct of the tower block and then continue underground in 25 mm polythene conduit.