Analysis of windbreaker combinations on steam power plant natural draft dry cooling towers

Zavaragh, Hadi Ghasemi; Ceviz, Mehmet Akif; Shervani-Tabar, Mohammad T.

doi:10.1016/j.applthermaleng.2016.01.103

Cited by 28 publications

(6 citation statements)

References 13 publications

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“…Cooling towers are classified based on different characteristics, although the following are the major ones: o Combination of wet-dry (hybrid) (Figure 3) (Zavaragh et al, 2016).…”

Section: Cooling Towers Typesmentioning

confidence: 99%

Advancing Water Conservation in Cooling Towers through Energy-Water Nexus

Ghoddousi

Anderson

Rezaie

2021

EUR J SUSTAIN DEV RES

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Life without water is not possible on the earth, while modern humans need water not only for drinking, sanitization, and agriculture but also for industrial activities including electricity and cooling generations. Hence, emphasis on water sustainability through different sectors including thermoelectric and cooling plants is an intelligent strategy while the tight connections of water and energy guide study towards energy-water nexus investigations. Cooling towers are equipment for dissipating the excess heat by water evaporation or they hidden gates for wasting water. The objective of the present study is to elaborate on the role of cooling towers in improving environment sustainability by presenting various methods of energy and water modeling, categorizing various methods for modifying water and energy consumptions through past studies and mapping future studies. regarding cooling towers. Presenting a history of energy-water modeling methods of cooling towers, the Markel, the Poppe, and the effectiveness-Number of Transfer Unit (NTU) models, has followed by assessing the environmental impact of cooling towers in the form of excess water consumption, plume, and energy usage. Summarizing and organizing the past efforts for upgrading water management in cooling towers have been in two directions either providing more water supply, or modifications of the cooling tower to use less water. Then the different methodologies for each direction are introduced for further elaborations. This study's practical outcome is proposing the methods of improving water sustainability for any cooling towers from past studies to assist engineers in the industry in modifying cooling towers water consumption. Showing the roadmap for the planning future investigations on the cooling towers based on the past efforts is another outcome of the present study to provide an insight for academia with research interest on cooling towers.

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“…Cooling towers are classified based on different characteristics, although the following are the major ones: o Combination of wet-dry (hybrid) (Figure 3) (Zavaragh et al, 2016).…”

Section: Cooling Towers Typesmentioning

confidence: 99%

Advancing Water Conservation in Cooling Towers through Energy-Water Nexus

Ghoddousi

Anderson

Rezaie

2021

EUR J SUSTAIN DEV RES

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“…One approach is to improve the distribution of the internal aerodynamic field by installing windbreak walls at the bottom of the NDDCT. The common types are three-leaf and cross-windbreak walls [7], and their mechanism is to eliminate the vortex in the tower generated by the crosswind [8]. And this effect is more obvious as the wind velocity increases.…”

Section: Introductionmentioning

confidence: 99%

Air Equalizing Mechanism in Cooling Performance Improvement of Vertical Delta-Type Radiators

Chen,

Zhao,

Zhang

et al. 2024

Energies

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Based on the design and measured data of one actual tower, a three-dimensional numerical model for a natural draft dry cooling tower (NDDCT) was created and validated under constant heat load. This enabled the performance improvement mechanism of air equalizing on vertical delta-type radiators (VDRs) to be clarified by detailed analysis of key parameters, such as the exit water temperature, heat transfer coefficient, and mass airflow. Under the impact of typical ambient crosswind, all VDRs were retrofitted with air-side-equalizing devices. It was found that the exit water temperatures of the whole NDDCT decreased by 0.865 °C, 0.593 °C and 0.186 °C under the studied ambient crosswind speeds of 2.5 m/s, 4 m/s and 12 m/s, respectively. The performance improvement mechanism of air-side equalizing was investigated for three VDRs, which were located on the upwind, tower lateral, and downwind sides under crosswind impacts. Besides the studied VDRs, the performance of the neighboring VDRs behind them was also improved by the optimized aerodynamic field and the reduced hot wind recirculation around them. In addition, the average heat transfer coefficients of the VDRs were enhanced, which could lay the foundation for improving the cooling performance of thermodynamic devices with VDRs.

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“…As with the traditional windbreaker first recommended by Preez and Kröger [11], Chen et al [12] subsequently presented the interior and exterior windbreaker configurations with a numerical simulation, showing that the exterior windbreakers were superior to the interior ones, especially at high wind speeds. Furthermore, Zavaragh et al [13] numerically proposed the internal flat and the combination of internal flat-external rounded windbreakers, which can move axially around the cooling tower, leading to the air mass flow rate increase from the wind momentum effect. Moreover, Gu et al [14] investigated the optimization of different wind-break structures, as the cross walls, wind-break walls, cross line-screen, and the louvers, concluding the most optimal structure is the wind-break wall, and the optimal louver opening as the second option, owing to its flexible adjustment.…”

Section: Introductionmentioning

confidence: 99%

Influencing Mechanisms of a Crosswind on the Thermo-Hydraulic Characteristics of a Large-Scale Air-Cooled Heat Exchanger

et al. 2019

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For the large scale air-cooled heat exchanger of a natural draft dry cooling system (NDDCS) in power plants, its thermo-flow characteristics are basically dominated by crosswinds. Unfortunately however, the detailed mechanisms of the crosswind effects have yet to be fully uncovered. Therefore, in this research, the local flow and heat transfer performances of the cooling deltas, which are also termed as the fundamental cells of the large-scale air-cooled heat exchanger, are specifically investigated with full consideration for the cell structure and the water-side temperature distribution at various wind speeds. A 3D CFD method with a realizable k-ε turbulence model, heat exchanger model, and porous media model is developed, and the accuracy and credibility of the numerical model are experimentally validated. With the numerical simulation, the overall 3D outlet air temperature of the large-scale air-cooled heat exchanger, and the corresponding local air velocity and temperature fields of the cooling deltas are qualitatively analyzed. Furthermore, the air-mass flow rate and heat rejection are also quantitatively studied at both the global and local views. The results depict that with an increase in the wind speed, the air mass flow rate and heat rejection will increase greatly for the frontal deltas; however, they will drop dramatically for the middle-front deltas. As for the middle- as well as the middle-rear deltas, the thermo-flow performances vary markedly at various wind speeds, which behave in the most deteriorated manner at a wind speed of 12 m/s. The rear deltas show the best thermo-flow performances at a wind speed of 12 m/s, but the worst at 16 m/s. A detailed analysis of the variable fields for each cooling delta may contribute to the performance improvement of the large-scale air-cooled heat exchanger of NDDCS.

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Analysis of windbreaker combinations on steam power plant natural draft dry cooling towers

Cited by 28 publications

References 13 publications

Advancing Water Conservation in Cooling Towers through Energy-Water Nexus

Advancing Water Conservation in Cooling Towers through Energy-Water Nexus

Air Equalizing Mechanism in Cooling Performance Improvement of Vertical Delta-Type Radiators

Influencing Mechanisms of a Crosswind on the Thermo-Hydraulic Characteristics of a Large-Scale Air-Cooled Heat Exchanger

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