Field test study on thermal and ventilation performance for natural draft wet cooling tower after structural improvement

Zhang, Zhengqing; Gao, Ming; Wang, Mingyong; Guan, Hongjun; Dang, Zhigang; He, Suoying; Sun, Fengzhong

doi:10.1016/j.applthermaleng.2019.04.015

Cited by 22 publications

(5 citation statements)

References 19 publications

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“…where N wd represents the number of water droplets per unit volume; A wd stands for the surface area of one droplet, m 2 ; the Sc a means the Schmidt number of moist air; Pr a represents the Prandtl number of moist air. In the fill zone, according to fill experiment, K a and K h can be expressed as Equations ( 18) and (19).…”

Section: Heat and Mass Transfer From Water To Airmentioning

confidence: 99%

“…Based on the MDCT, Guo et al [14] developed a parallel hybrid model to optimize and evaluate the cooling ability of the tower. In past years, the influence of crosswind on the Merkel number [15], water droplet diameter distribution [16], cooling capacity [17], ventilation efficiency [18], and air intake uniformity coefficient [19] of towers have been researched substantially, with research aimed at natural draft cooling towers and not mechanical draft cooling towers.…”

Section: Introductionmentioning

confidence: 99%

“…To intensify ventilation rate and decrease water temperature of the tower under crosswind conditions, Zhang et al [19,20] presented a dry-wet hybrid rain zone, which can classify an existing rain zone into the dry parts and wet parts. Their finding was that the dry-wet hybrid rain zone can increase ventilation rate and eliminate the high temperature zone of center of the tower.…”

Section: Introductionmentioning

confidence: 99%

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

Deng

Sun

2021

Energies

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To enhance the cooling capacity of a single air inlet induced draft cooling tower (SIDCT), the stepped fill layout pattern is proposed in this paper. A three-dimensional numerical model is established and validated by field measurement data. The cooling capacity of towers equipped with uniform fill and stepped fill is compared under various crosswind velocities (0 m/s–12 m/s) and crosswind angles (0°–180°). The results showed that the ventilation rate of the total tower with stepped fill is increased. Under the studied crosswind velocity and angle, the cooling capacity of the stepped fill tower is superior to the uniform fill tower. After using stepped fill, the mean drop of outlet water temperature rises by 0.29 °C, 0.27 °C, 0.17 °C, 0.10 °C, and 0.19 °C, corresponding to crosswind angles from 0° to 180°. The increment of cooling capacity is the maximum under the crosswind angles of 0° and 45° and is the minimum under the crosswind angles of 90° and 135°. The maximum increased value of N is 0.65 under the crosswind velocity of 4 m/s, 0.85 under 8 m/s, and 0.95 under 12 m/s.

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Section: Heat and Mass Transfer From Water To Airmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Deng

Sun

2021

Energies

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“…Chen et al [6,7] suggested that installing air ducts in the rain area could improve the aerodynamic field of the tower and alleviate the adverse crosswind effect, so as to significantly improve the performance of TWCTs. Structural improvement measures-including adding air deflectors, using non-uniform fillings, and adding air ducts-were also implemented in one large-scale TWCT in order to weaken the adverse influence of crosswind [8]. However, the outlet water temperature of TWCTs remained limited by the inlet air's wet-bulb temperature, which is a major disadvantage, despite many useful methods having been proposed [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of a Maisotsenko Cycle Cooling Tower with Uneven Length of Dry and Wet Channels in Hot and Humid Conditions

Fan

Wang

et al. 2021

Energies

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The use of the Maisotsenko cycle (M-Cycle) in traditional wet cooling towers (TWCTs) has the potential to reduce the costs of electricity generation by cooling water below the inlet air’s wet-bulb temperature. TWCTs cannot provide sufficient cooling capacity for the increasing demand for cooling energy in the power and industrial sectors—especially in hot and wet climates. Due to this fact, an experimental system of an M-Cycle cooling tower (MCT) with parallel counter-flow arrangement fills was constructed in order to provide perspective on the optimal length of dry channels (ldry), thermal performance under different conditions, and pressure drops of the MCT. Results showed that the optimal value of ldry was 2.4 m, and the maximum wet-bulb effectiveness was up to 180%. In addition, the impact of air velocity in wet channels on the pressure drops of the novel fills was also summarized. This study confirms the great potential of using the M-Cycle in TWCTs, and provides a guideline for the industrial application and performance improvement of MCTs.

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“…It was found that in the range of the tested wind velocities up to 4 m/s, wind negatively affected water cooling by reducing ∆T w by a maximum of 1.75 • C, which constituted a 15% temperature drop. Paper [16] presents the results of repeated tests when air-deflectors were introduced at the air inlet of the cooling tower. Their role was to reduce the effect of wind on the heat exchange process in the cooling tower.…”

Section: Introductionmentioning

confidence: 99%

Impact of Weather Conditions on the Operation of Power Unit Cooling Towers 905 MWe

et al. 2021

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The paper presents the results of measurements and calculations concerning the influence of weather conditions on the operation of wet cooling towers of 905 MWe units of the Opole Power Plant (Poland). The research concerned the influence of temperature and relative humidity of air, wind and power unit load on the water temperature at the outlet from the cooling tower, the level of water cooling, cooling efficiency and cooling water losses. In the cooling water loss, the evaporation loss stream and the drift loss stream were distinguished. In the analyzed operating conditions of the power unit, for example, an increase in Tamb air by 5 °C (from 20–22˚C to 25-27˚C) causes an increase in temperature at the outlet of the cooling tower by 3-4˚C. The influence of air temperature and humidity on the level of water cooling ΔTw and cooling efficiency ε were also found. In the case of ΔTw, the effect is in the order of 0.1-0.2˚C and results from the change in cooling water temperature and the heat exchange in the condenser. The ε value is influenced by air temperature and humidity, which determine the wet bulb temperature value. Within the range of power changes of the unit from 400 to 900 MWe, the evaporated water stream mev, depending on the environmental conditions, increases from 400-600 tons/h to the value of 1000-1400 tons/h. It was determined that in the case of the average power of the unit at the level of 576.6 MWe, the average values of the evaporation and drift streams were respectively 0.78% and 0.15% of the cooling water stream. Using statistical methods, it was found that the influence of wind on the level of water cooling, cooling efficiency and cooling water losses was statistically significant.

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Field test study on thermal and ventilation performance for natural draft wet cooling tower after structural improvement

Cited by 22 publications

References 19 publications

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

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

Performance Evaluation of a Maisotsenko Cycle Cooling Tower with Uneven Length of Dry and Wet Channels in Hot and Humid Conditions

Impact of Weather Conditions on the Operation of Power Unit Cooling Towers 905 MWe

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