Author
Cheng Shi
Bio: Cheng Shi is an academic researcher. The author has contributed to research in topics: Tower & Cooling tower. The author has an hindex of 1, co-authored 1 publications receiving 10 citations.
Topics: Tower, Cooling tower, Heat transfer
Papers
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TL;DR: In this paper, a three-dimensional numerical model is established and validated for cooling performance optimization between a high-level water collecting natural draft wet cooling tower (HNDWCT) and a usual NVDWCT under the actual operation condition at Wanzhou power plant, Chongqing, China.
Abstract: A three-dimensional (3D) numerical model is established and validated for cooling performance optimization between a high-level water collecting natural draft wet cooling tower (HNDWCT) and a usual natural draft wet cooling tower (UNDWCT) under the actual operation condition at Wanzhou power plant, Chongqing, China. User defined functions (UDFs) of source terms are composed and loaded into the spray, fill and rain zones. Considering the conditions of impact on three kinds of corrugated fills (Double-oblique wave, Two-way wave and S wave) and four kinds of fill height (1.25 m, 1.5 m, 1.75 m and 2 m), numerical simulation of cooling performance are analysed. The results demonstrate that the S wave has the highest cooling efficiency in three fills for both towers, indicating that fill characteristics are crucial to cooling performance. Moreover, the cooling performance of the HNDWCT is far superior to that of the UNDWCT with fill height increases of 1.75 m and above, because the air mass flow rate in the fill zone of the HNDWCT improves more than that in the UNDWCT, as a result of the rain zone resistance declining sharply for the HNDWCT. In addition, the mass and heat transfer capacity of the HNDWCT is better in the tower centre zone than in the outer zone near the tower wall under a uniform fill layout. This behaviour is inverted for the UNDWCT, perhaps because the high-level collection devices play the role of flow guiding in the inner zone. Therefore, when non-uniform fill layout optimization is applied to the HNDWCT, the inner zone increases in height from 1.75 m to 2 m, the outer zone reduces in height from 1.75 m to 1.5 m, and the outlet water temperature declines approximately 0.4 K compared to that of the uniform layout.
10 citations
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TL;DR: In this article, the air-side flow resistance of high-level water collecting cooling towers (HWCCTs) has been investigated in a wind tunnel to simulate the airflow across different designs of WCDs.
17 citations
TL;DR: In this paper, three parameters αs, αf and αr, which represent the cooling capacity of water-spraying zone, fillings zone and rain zone, respectively, are introduced to evaluate the crosswind influence on different zones.
16 citations
TL;DR: In this article, the aerodynamic field around high-level water collecting natural draft wet cooling tower (HNDWCT), especially that below its special HWCDs, strongly affects the tower efficiency, thus the air distribution in heat and mass transfer zones and air mass flow rate through tower, resulting in degradation of tower cooling performance.
14 citations
TL;DR: In this paper, a numerical simulation was conducted on one real wet cooling tower equipped for a 600MW unit to study the relatively optimal combination of 26mm and 30mm spacing fillings.
12 citations
TL;DR: In this article, a new natural draft wet cooling tower (NNDWCT) with different water collecting modes at its periphery and center has been proposed, which shows the elimination of vortex and the improvement of its peripheral heat dissipation capacity.
7 citations