Experimental investigation on thermal performance of natural draft wet cooling towers employing an innovative wind-creator setup

Alavi, Seyed Rashid; Rahmati, Mehdi

doi:10.1016/j.enconman.2016.06.016

Cited by 63 publications

(14 citation statements)

References 27 publications

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“…In order to assess the accuracy of the present work, comparison was made with data from literature. Figure 6 compares the experimental and numerical data with those obtained by Avari [8]. Regardless the effectiveness value for volume flow rate less than 5 L/min.…”

Section: Resultsmentioning

confidence: 79%

“…Yet, increasing cross wind shows that a knee point is found at critical cross wind velocity at bottom of the tower equals to (0.6) m/s. Alavi et al [8] investigated the performance of heat transfer in counter-flow NDWCT, under cross-wind and windless conditions by wind-creator setup to implement actual characteristics of the natural wind speed profile. This research studied the influence of water volume flow rate, cross-wind velocity, fill thickness and inlet water temperature on the water temperature variation and effectiveness.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of thermal performance for natural and forced draft wet cooling tower

Al-Dulaimi¹,

Kareem²,

Hamad³

2019

JMES

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This paper presents an experimental and numerical investigation of the thermal performance of natural draft wet cooling tower (NDWCT). The experimental investigation is carried out under natural draft condition and forced draft condition created by an axial fan. The operational parameters considered in this study are the thickness of the fill (10 and 20 cm), inlet water temperature (40, 45, and 50 °C) and inlet water volume flow rate (5.68, 7.75, and 9.46 L/min). The experimental results showed that the thermal performance is improved when the fans are used with the NDWCT. The temperature difference between inlet and outlet and effectiveness increase by 35% and 37.2%, respectively at fill thickness of 20 cm and water volume flow rate of 11.35 L/min. The temperature distribution of the air and the relative humidity were numerically simulated for both cases of natural and forced draft by employing the commercial CFD software ANSYS Fluent 15. The experimental and numerical results were validated with results from a previous work and showed a good agreement. The experimental results showed that the effectiveness increase by 22% and 30% for NDWCT and FDWCT respectively when in case of fill thickness 20 cm.

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Section: Resultsmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Evaluation of thermal performance for natural and forced draft wet cooling tower

Al-Dulaimi¹,

Kareem²,

Hamad³

2019

JMES

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“…Natural draft wet cooling towers are one of the most widely-used types of wet cooling towers in large-scale power plants [1]. As a major device for water saving and environmental protection, a water collector is usually installed above the water shower.…”

Section: Introductionmentioning

confidence: 99%

Water saving performance and macro fluid analysis of a new cyclonic water collector

Qiu

Chen

2019

THERM SCI

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Power and chemical plants entail serious water loss during their operation. In order to save water by alleviating the loss of the circulating water in the cooling tower, a FLUENT simulation is performed to design and analyze a cyclonic water collector. The geometrical structure of the collector was such designed that the trajectory of the steam is optimized. The turbulence caused by the collector increases the possibility for collisions between water molecules, and the accumulation of tiny drops could be recycled. The results of the numerical simulation and the experiment verification demonstrate the ability of the proposed device to save much water. Furthermore, the mechanisms for water recycling and water saving are elucidated clearly through the gas-liquid coupling of the circulating water and cooling water. The present theory gives deep insights into the optimization of water-saving facilities and improvement of water-saving efficiency.

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“…In addition, other scholars mainly analysed the influence of various thermodynamic parameters (e.g. outlet water temperature, gas temperature, ventilation rate and ventilation resistance) over the overall design and heat transfer properties of the cooling tower [22][23][24]. However, there is a huge deviation of the simulated results from the actual results in the above studies, which fail to consider the gas reflux, drifting, ambient temperature, ambient humidity, etc.…”

Section: Introductionmentioning

confidence: 99%

Analysis on thermodynamic performance of ancient pagodas considering flow heat transfer properties

Liu¹,

Wang²,

Yang³

et al. 2018

IJHT

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The optimization of cooling and ventilation systems is essential to the protection of ancient pagodas, which boast profound historical, cultural and tourism values. This calls for thorough investigation into the thermodynamic and flow heat transfer properties of the central airconditioning system (CACS) in the pagoda. In this paper, a thermodynamic model of the cooling tower is established in the principle of differential calculation, and verified through field test. On this basis, the author further discussed the impacts of drifting and reflux effect on the working performance of the cooling tower. The results show that: without considering the drifting effect, there is only a slight error between the measured inlet air enthalpy, inlet air temperature and inlet air relative humidity and the values simulated by the proposed model; in actual operation, the drifting of water vapour away from the cooling tower carries away some heat, leading to reduced temperature and increased relative humidity at the air inlet; the reflux ratio within the cooling tower is positively correlated with the water temperature, dry-bulb temperature and relative humidity at the outlet of the cooling tower, but negatively with the heat exchange amount of the tower, under different atmospheric dry-bulb temperatures, atmospheric relative humidities and gas-water ratios; the reflux of water vapour has a significant impact on the cooling performance of the cooling tower, and the impact is positively correlated to the reflux ratio. The research findings provide theoretical support for engineering applications like heating, cooling and ventilation in ancient pagodas.

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Experimental investigation on thermal performance of natural draft wet cooling towers employing an innovative wind-creator setup

Cited by 63 publications

References 27 publications

Evaluation of thermal performance for natural and forced draft wet cooling tower

Evaluation of thermal performance for natural and forced draft wet cooling tower

Water saving performance and macro fluid analysis of a new cyclonic water collector

Analysis on thermodynamic performance of ancient pagodas considering flow heat transfer properties

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