Abstract Natural draft dry cooling tower (NDDCT) are a favourable choice for the cooling system of concentrating solar thermal power (CST) plants located in arid regions with high solar radiation. However, additional cooling towers may be required as the capacity of the CST plants is increased. The geometrical arrangement of the NDDCTs is an influencing parameter on the thermo-flow performance of the entire system. The aim of this study was to investigate the effect of tower spacing and wind speed on the performance of three short NDDCTs in an in-line layout. The simulated tower is representative of an actual steel-membrane cooling tower in a campus of the University of Queensland. The geometry of the cooling tower in this study is a cylindrical shape with a horizontally arranged air-cooled heat exchanger, and is 20 m high with a diameter of 12.5 m. This study investigated the effect of two major parameters: wind speeds (0–8 m/s), wind and tower spacings (1.8D, 2.6D, and 4.2D) on the thermo-flow performance of the cooling towers. The interaction of the towers from the bottom and top of the towers were identified at different tower spacings and wind speeds. At all tower spacings, the windward tower protects the middle and leeward towers by deflecting the upcoming wind. The interaction of the towers happens both from the bottom and top of the towers. Finally, it was concluded that enlarging the towers increase the thermal performance of the towers during windy conditions and this may lead in better protection of the windward tower for the leeward ones.

中文翻译：

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串联布置的三个短自然通风干式冷却塔相互作用的数值研究

摘要 自然通风干式冷却塔（NDDCT）是太阳能热辐射高的干旱地区聚光光热发电厂冷却系统的理想选择。但是，随着 CST 工厂的产能增加，可能需要额外的冷却塔。NDDCT 的几何排列是影响整个系统热流性能的参数。本研究的目的是研究塔间距和风速对串联布局中三个短 NDDCT 性能的影响。模拟塔是昆士兰大学校园内一座实际钢膜冷却塔的代表。本研究中冷却塔的几何形状为圆柱形，带有水平布置的风冷换热器，高 20 m，直径为 12。5米。本研究调查了两个主要参数：风速 (0–8 m/s)、风和塔间距（1.8D、2.6D 和 4.2D）对冷却塔热流性能的影响。在不同的塔间距和风速下，从塔的底部和顶部确定了塔的相互作用。在所有塔间距处，迎风塔通过偏转即将到来的风来保护中间和背风塔。塔的相互作用发生在塔的底部和顶部。最后，得出的结论是，在有风条件下，扩大塔可以提高塔的热性能，这可能会为背风塔更好地保护迎风塔。2D) 关于冷却塔的热流性能。在不同的塔间距和风速下，从塔的底部和顶部确定了塔的相互作用。在所有塔间距处，迎风塔通过偏转即将到来的风来保护中间和背风塔。塔的相互作用发生在塔的底部和顶部。最后，得出的结论是，在有风条件下，扩大塔可以提高塔的热性能，这可能会为背风塔更好地保护迎风塔。2D) 关于冷却塔的热流性能。在不同的塔间距和风速下，从塔的底部和顶部确定了塔的相互作用。在所有塔间距处，迎风塔通过偏转即将到来的风来保护中间和背风塔。塔的相互作用发生在塔的底部和顶部。最后，得出的结论是，在有风条件下，扩大塔可以提高塔的热性能，这可能会为背风塔更好地保护迎风塔。迎风塔通过偏转即将到来的风来保护中间和背风塔。塔的相互作用发生在塔的底部和顶部。最后，得出的结论是，在有风条件下，扩大塔可以提高塔的热性能，这可能会为背风塔更好地保护迎风塔。迎风塔通过偏转即将到来的风来保护中间和背风塔。塔的相互作用发生在塔的底部和顶部。最后，得出的结论是，在有风条件下，扩大塔可以提高塔的热性能，这可能会为背风塔更好地保护迎风塔。