Thermal Performance for Wet Cooling Tower with Different Layout Patterns of Fillings under Typical Crosswind Conditions

Abstract

Abstract:A thermal-state model experimental study was performed in lab to investigate the thermal performance of a wet cooling tower with different kinds of filling layout patterns under windless and 0.4 m/s crosswind conditions. In this paper, the contrast analysis was focused on comparing a uniform layout pattern and one kind of optimal non-uniform layout pattern when the environmental crosswind speed is 0 m/s and 0.4 m/s. The experimental results proved that under windless conditions, the heat transfer coefficient and total heat rejection of circulating water for the optimal non-uniform layout pattern can enhance by approximately 40% and 28%, respectively, compared with the uniform layout pattern. It was also discovered that the optimal non-uniform pattern can dramatically relieve the influence of crosswind on the thermal performance of the tower when the crosswind speed is equal to 0.4 m/s. For the uniform layout pattern, the heat transfer coefficient under 0.4 m/s crosswind conditions decreased by 9.5% compared with the windless conditions, while that value lowered only by 2.0% for the optimal non-uniform layout pattern. It has been demonstrated that the optimal non-uniform layout pattern has the better thermal performance under 0.4 m/s crosswind condition.

Recent Progress in Fill Media Technology for Wet Cooling Towers

“…Furthermore, the inclusion of experiments conducted after 201 sures that the table reflects the most recent advancements in cooling tower technology. Gao et al [20] Lu et al [21] Counterflow cooling tower Film-type fill Commercial corrugated packing with 98% porosity and dimensions: 5000 × 3300 × 2900 mm 3 ---Rahmati et al [22] Forced draft wet cooling tower Film-type fill, VGA (vertical grid apparatus), height of 95 cm PVC ---Singla et al [23] Counterflow forced draft cooling tower Expanded wire meshed fill ---…”

Comparative Study on the Cooling Characteristics of Different Fill Layout Patterns on a Single Air Inlet Induced Draft Cooling Tower

“…For fully expressing the cooling capacity of tower, the Merkel number can be introduced, which has been widely applied in previous studies. The Merkel number is defined by Equation (26).…”

“…The water surface temperature reduced by a maximum of 0.68 • C compared with no air duct. For making full use of the cooling capacity of the fill in a natural draft wet cooling tower, Zhou et al [25] and Gao et al [26] presented a non-uniform fill so that the height of the fill is higher in the air inlet, while lower in the center of the tower, and found that non-uniform fill improved thermal performance and decreased outlet water temperature, compared to uniform fill. Lye et al [27] also researched non-uniform fill in the wet cooling tower with high-level water-collecting devices, where the height of fill is higher in the center of the tower region and the height is lower in the air inlet.…”

Entransy-based optimization on the energy-saving potentials of thermal power generation

“…Gao等人 [69] 对于涉及热湿迁移现象的空间非均匀 分布优化已经有了初步尝试, 布置方法示意图见图20, Figure 20 The ununiform layout of packing fills [69].…”