Innovative correlation for calculating thermal performance of counterflow wet-cooling tower

Mansour, M. Khamis; Hassab, M.A.

doi:10.1016/j.energy.2014.07.059

Cited by 30 publications

(7 citation statements)

References 5 publications

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“…Therefore, the fill with a VG is better than the one without. The lower the approach value, the better the performance of the cooling tower, as it represents its ability to lower the temperature of the water closer to the wetbulb temperature of the surrounding air [5]. It can thus be concluded that a VG can reduce the approach value in the forced draught fill type of the cooling tower.…”

Section: Resultsmentioning

confidence: 99%

“…Several studies have been conducted to improve the efficiency of cooling towers. Improvement of evaporation can reduce the wet ball by 85-95%, while the filler surface affects the decrease in the ratio of water mass flux to air [4,5]. Interesting results have been obtained using a fill made alternative material such as pebbles, PET strip, and coconut husk and energy loses also reduced using alternative fill [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Performance Improvement of a Forced Draught Cooling Tower Using a Vortex Generator

Mugisidi¹,

Heriyani²,

Gunawan³

et al. 2021

CFDL

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Cooling systems using colling towers are often an important element in a production process and always involve water or energy consumption. Therefore, increasing the efficiency of the colling tower will reduce water and / or energy consumption. In order to increase the efficiency of colling tower energy consumption, the most studied part is the fills, where heat transfer occurs. However, there are no studies on the use of vortex generators in colling tower fills. Hence the aim of this study was to evaluate the performance improvement in a forced draught cooling tower using a vortex generator. It was conducted on a laboratory scale using single fill as a trial medium. The fill was made of 3-mm acrylic with dimensions of 30 × 30 × 1950 mm. A three-unit vortex generator was placed inside the fill. The rectangular vortex generator was made of 0.5-mm thick aluminium and had a size of 50 × 10 mm. Data were retrieved for the fills with and without a vortex generator. Water and air discharge of 1 L/minute and an inlet water temperature of 60°C were maintained. The results indicated that the effectiveness of the fill with a vortex generator was increased by 90.72% compared to the fill without a vortex generator.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance Improvement of a Forced Draught Cooling Tower Using a Vortex Generator

Mugisidi¹,

Heriyani²,

Gunawan³

et al. 2021

CFDL

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show abstract

“…However, since the efficiency and the outlet temperature are unknown, a correlation detailed by Mansour et al is used to calculate the CT efficiency as follows:

ε = \frac{ε^{*}}{ε^{*} + 1},

ε^{*} = \frac{((), Cro) ((), NTU)}{1 - 0.5 italicNTU ((), italicCro - \frac{L}{G})},

italicNTU = c {(\frac{L}{G})}^{n + 1},

italicCro = \frac{b}{C_{p}} .

…”

Section: System Components Modelsmentioning

confidence: 99%

“…The L/G parameter stands for the water‐air mass flow ratio. Liu et al and Khamis et al studied the counter flow cooling tower and obtained an optimal L/G ratio of 0.83, which is used in this study. The constants “ c ” and “ n ” are characteristics of the cooling tower which depend on the geometry of the tower and the roughness of the fill material.…”

Section: System Components Modelsmentioning

confidence: 99%

Effect of storage tanks on solar‐powered absorption chiller cooling system performance

Toprak

Ouedraogo

2020

Int J Energy Res

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Summary Thermal storage, low power tariff at night, and low nocturnal temperature can be used in synergy to reduce the cooling costs of the solar‐powered absorption chiller cooling systems. This study aims to reduce the required cooling capacity of an absorption chiller (ACH) powered by a solar parabolic trough collector (PTC) and a backup fuel boiler by integrating thermal storage tanks. The thermal performance of the system is simulated for a building that is cooled for 14 h/day. The system uses 1000 m2 PTC with 1020 kW ACH. Chilled water storage (CHWS) and cooling water storage (CWS) effects on the system performance for different operation hours per day of the ACH under Izmir (Turkey) and Phoenix (USA) weather conditions are analyzed. When the ACH operates 14 h/day as the load for both systems and both locations, the variations of the solar collector efficiency and the cooling load to heat input ratio remain less than 4% after the modifications. From the addition of CHWS to the reference system, a parametric study consisting of changing the ACH operation hours per day shows that the required cooling capacity of the ACH can be reduced to 34%. The capacity factor of the ACH is improved from its reference value of 41% up to 96%.

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“…In this case, the reflux effect may occur in the cooling tower under the crosswind. This effect must be considered in the thermodynamic simulation and theoretical calculation of the cooling tower [12][13][14][15][16].…”

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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Innovative correlation for calculating thermal performance of counterflow wet-cooling tower

Cited by 30 publications

References 5 publications

Performance Improvement of a Forced Draught Cooling Tower Using a Vortex Generator

Performance Improvement of a Forced Draught Cooling Tower Using a Vortex Generator

Effect of storage tanks on solar‐powered absorption chiller cooling system performance

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

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