Cooling performance of cylinder-frustum natural draft dry cooling tower

Song, Guoqing; Zhi, Xu; Fan, Feng; Wang, Wei; Wang, Peng

doi:10.1016/j.applthermaleng.2020.115797

Cited by 12 publications

(2 citation statements)

References 30 publications

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“…Recently, a steel tower with the cylinder/frustum configuration was proposed and taken as the study object of the experiment and numerical simulation. For this steel-tower configuration, a geometric parameter of the proportion of the frustum section height to the entire tower height was recommended with a range from 0.3 to 0.5 [8]. This research can actually provide some guidelines for the cooling performance design of the steel-truss NDDCS; however, it is worth pointing out that a systematic study on clarifying thermal and flow behaviors of steel-truss natural draft dry cooling systems with various engineering tower configurations is quite necessary to promote thermal design to a further extent.…”

Section: Introductionmentioning

confidence: 99%

Tower Configuration Impacts on the Thermal and Flow Performance of Steel-Truss Natural Draft Dry Cooling System

et al. 2021

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In recent years, the steel-truss natural draft dry cooling technique has received attention owing to its advantages in better aseismic capability, shorter construction period, and preferable recycling. For cooling towers generating the draft force of air flow, its configuration may impact the thermal and flow performance of the steel-truss natural draft dry cooling system. With regard to the issue, this work explored the thermal and flow characteristics for the steel-truss natural draft dry cooling systems with four typical engineering tower configurations. By numerical simulation, the pressure, flow, and temperature contours were analyzed, then air mass flow rates and heat rejections were calculated and compared for the local air-cooled sectors and overall steel-truss natural draft dry cooling systems with those four tower configurations. The results present that tower 2 with the conical/cylindrical configuration had slightly lower heat rejection compared with tower 1 with the traditional hyperbolic configuration. Tower 3 with the hyperbolic/cylindrical configuration showed better thermo-flow performances than tower 1 at high crosswinds, while tower 4 with the completely cylindrical configuration appeared to have much reduced cooling capability under various crosswind conditions, along with strongly deteriorated thermal and flow behaviors. As for engineering application of the steel-truss natural draft dry cooling system, the traditional hyperbolic tower configuration is recommended for local regions with gentle wind, while for those areas with gale wind yearly, the hyperbolic/cylindrical integrated cooling tower is preferred.

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Section: Introductionmentioning

confidence: 99%

Tower Configuration Impacts on the Thermal and Flow Performance of Steel-Truss Natural Draft Dry Cooling System

et al. 2021

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“…In addition, increasing the height of the flue gas outlet was recommended [7]. For NDDCSs with steel cooling towers, the cooling performance with the cylinder-frustum tower shell was explored and compared with the traditional hyperbolic tower shell [8]. Other cooling systems, such as wind towers installed on the rooftops of buildings [9], as well as aero-dynamic devices, such as the indoor air decontamination [10] and spilt-type air conditioner, were also studied [11].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Thermo-Flow Characteristics of Natural Draft Dry Cooling Systems Designed with Only One Tower in 2 × 660 MW Power Plants

Liu¹,

Chen²,

Jiang³

et al. 2021

Energies

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In recent years, natural draft dry cooling systems with only one tower have been adopted in some 2 × 660 MW power-generating units owing to the advantage of lower construction costs. The operating cases of two power-generating units and one power-generating unit will both appear based on the power load requirement, which may lead to very different flow and heat transfer performances of this typical cooling system. Therefore, this research explores the local thermo-flow characteristics of air-cooled heat exchangers and sectors, and then analyzes the overall cooling performance of the above two operating cases under various wind conditions. Using the numerical modeling method, the results indicate that the flow and heat transfer performance of this cooling system decreases significantly in the case of one unit with half sectors dismissed. At wind speeds lower than 8 m/s, the difference in turbine back pressure between two units and one unit appears obviously higher than in other wind conditions, even reaching 4.37 kPa. Furthermore, the air-cooled heat exchanger in the lower layer always has better cooling capability than that in the upper layer, especially in conditions where there is an absence of wind and under low wind speeds. The operating case of one unit is not recommended for this dry cooling system because of the highly decreased energy efficiency. In conclusion, this research could provide theoretical support for the engineering operation of this typical natural draft dry cooling system in 2 × 660 MW power plants.

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Thermal performance and structural behaviour of steel hyperbolic cooling tower with holes

Song

Zhi

et al. 2023

Applied Thermal Engineering

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Cooling performance of cylinder-frustum natural draft dry cooling tower

Cited by 12 publications

References 30 publications

Tower Configuration Impacts on the Thermal and Flow Performance of Steel-Truss Natural Draft Dry Cooling System

Tower Configuration Impacts on the Thermal and Flow Performance of Steel-Truss Natural Draft Dry Cooling System

Investigation of Thermo-Flow Characteristics of Natural Draft Dry Cooling Systems Designed with Only One Tower in 2 × 660 MW Power Plants

Thermal performance and structural behaviour of steel hyperbolic cooling tower with holes

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