Thermal characteristics of dry cooling tower reconstructed from obsolete natural draft wet cooling tower and the relevant thermal system coupling optimization

Ge, Wenjing; Zhao, Yuanbin; Song, Shiwei; Li, Wendong; Gao, Shasha; Chen, Tiefeng

doi:10.1016/j.applthermaleng.2020.115202

Cited by 17 publications

(2 citation statements)

References 32 publications

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“…Cooling towers are classified into three flow patterns: cross-flow, parallel-flow, and counter-flow 20 . In terms of using a fan, cooling systems are divided into natural draft and mechanical draft cooling towers 21 .…”

Section: Introductionmentioning

confidence: 99%

Optimizing the heat transfer characteristics of MWCNTs and TiO2 water-based nanofluids through a novel designed pilot-scale setup

Javadpour

Heris

Mohammadfam

et al. 2022

Sci Rep

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This study aimed to investigate the effect of titanium dioxide (TiO2) nano additives on the thermal performance of a pilot-scale cross-flow cooling tower. Moreover, it is a continuation of our previous study on the effect of using multi-walled carbon nanotubes (MWCNTs) nanofluid, and the results were compared with the results of TiO2 and previous work. An experimental design by response surface methodology (RSM) based on central composite design (CCD) with two factors (concentration and flow rate) was used to study the effectiveness of the setup, Merkel number, and the cooling range. The nanofluids were prepared by the two-step method. The stability tests were performed considering different surfactants such as Gum Arabic, Triton X-100, and sodium dodecyl sulfate, and Gum Arabic was determined as the optimal surfactant. The visual method, dynamic light scattering (DLS), and Zeta potential analyses were used to ensure the stability of the nanofluids and determine the size distribution of the nanoparticles in the nanofluids. The findings revealed that the heat transfer characteristics of the working fluid were improved with the addition of nanoparticles. Moreover, by comparing the effect of nanoparticles, it was found that MWCNTs could enhance the thermal features better than TiO2. The nanofluid containing 0.085 wt% of the MWCNTs improves the Merkel number, effectiveness, and cooling range by 28, 10.2, and 15.8%, respectively, whereas these values for TiO2 containing nanofluids are 5, 4.1, and 7.4%, respectively. MWCNTs nanofluid with a concentration of 0.069 wt% and a flow rate of 2.092 kg/min was proposed for optimal system setup. Under these conditions, the cooling range, effectiveness, and Merkel number were about 23.5, 55.75%, and 0.64, respectively.

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Section: Introductionmentioning

confidence: 99%

Optimizing the heat transfer characteristics of MWCNTs and TiO2 water-based nanofluids through a novel designed pilot-scale setup

Javadpour

Heris

Mohammadfam

et al. 2022

Sci Rep

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“…For a solar thermal power plant with increased capacity, the tower spacing of three short NDDCSs in an in-line layout was studied, then the interaction of the towers from the bottom to the top was identified at different tower spacings and wind speeds [5]. The reconstruction of natural draft wet cooling towers into natural draft dry cooling towers is attractive due to the saving of capital expenditure for some old thermal power plants, but the thermal characteristics of dry cooling towers reconstructed from obsolete wet cooling towers have been of concern [6]. The flue gas from an NDDCS cannot be discharged smoothly under unfavorable working conditions and may cause severe corrosion on the inner shell of the cooling tower, hence the flue gas flow and pollutant diffusion were numerically illustrated.…”

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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Thermo-Flow Performances for the Main-Auxiliary Integrated Natural Draft Dry Cooling System

Zhang,

Hou,

Zhou

et al. 2024

J. Therm. Sci.

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Thermal characteristics of dry cooling tower reconstructed from obsolete natural draft wet cooling tower and the relevant thermal system coupling optimization

Cited by 17 publications

References 32 publications

Optimizing the heat transfer characteristics of MWCNTs and TiO2 water-based nanofluids through a novel designed pilot-scale setup

Optimizing the heat transfer characteristics of MWCNTs and TiO2 water-based nanofluids through a novel designed pilot-scale setup

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

Thermo-Flow Performances for the Main-Auxiliary Integrated Natural Draft Dry Cooling System

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