Investigation of heat transfer characteristics of deflected elliptical-tube heat exchanger in closed-circuit cooling towers

Zhou, Chengman; Hu, Yiyang; Zhang, Lin; Fang, Jiamei; Xi, Ying; Hu, Jiuru; Li, Yong; Liu, Lei; Zhao, Youchang; Yang, Lu; Wu, Jiayong

doi:10.1016/j.applthermaleng.2023.121860

Cited by 8 publications

(2 citation statements)

References 29 publications

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“…Zhao et al [14] observed reduced workability and f cu when preparing ultra-high-performance concrete (UHPC) with 100% iron ore tailings sand substitution. Ma et al [15] prepared full iron tailings concrete (FITC) beams using iron tailings powder, iron tailings gravel, and sand and investigated the flexural behavior and found that the current design code in China effectively determines the load-carrying capacity of FITC beams. However, modifications are necessary for the deflection calculation formula.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Sulfate Freeze–Thaw Resistance of Calcium Carbonate Whisker-Reinforced Iron Ore Tailings Concrete

Wang,

Gao,

Liu

2024

Buildings

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Iron ore tailings from iron ore mines pose environmental challenges. However, their reuse could provide significant environmental benefits. This study focused on producing clean concrete using iron ore tailings as crushed stone aggregate (IOTA) and calcium carbonate whiskers (CWs) as reinforcement. Five mixture groups were prepared: normal concrete (NAC) with natural crushed stone aggregate (NA), iron ore tailings concrete (TAC) with IOTA, and CW (10%, 20%, and 30%)-reinforced TAC (TAC-CW). Mechanical properties like the compressive strength (fcu) and splitting tensile strength (fst), as well as sulfate freeze–thaw (F-T) cycle resistance, were thoroughly investigated. Additionally, pore structure and microstructure were characterized using nuclear magnetic resonance (NMR) and scanning electron microscopy (SEM) techniques. The results showed that IOTA’s complete replacement of NA decreased concrete mechanical properties and frost resistance, but incorporating CWs effectively compensated for these losses. Specifically, the fcu and fst of TAC-CW20 with 20% CWs increased by 23.26% and 49.6% compared to TAC and were higher than those of NAC. With increasing F-T cycles, concrete internal pore structure significantly deteriorated, and corrosive products increased significantly, which was further confirmed by SEM. TAC-CW20 significantly optimized pore structure. Overall, the successful application of iron ore tailings as eco-friendly materials enhanced concrete performance and reduced the environmental impact of construction activities.

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Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Sulfate Freeze–Thaw Resistance of Calcium Carbonate Whisker-Reinforced Iron Ore Tailings Concrete

Wang,

Gao,

Liu

2024

Buildings

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“…Evaporative cooling systems currently available can be categorised into direct-contact (DC) evaporative cooling as well as ICESs. In evaporative cooling through DC, the air in need of cooling is brought into DC with the LWF and the need can be met through a heat transfer (HT) between the WA and the LWF [15]. Evaporative cooling through DC is suitable for usage primarily in arid, hot environmental conditions, or in spaces that necessitate both cooling and humidification [16].…”

Section: Introductionmentioning

confidence: 99%

Contemporary Evaporative Cooling System with Indirect Interaction in Construction Implementations: A Theoretical Exploration

Cuce,

Riffat

2024

Buildings

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The construction sector, including in developed countries, plays a notable part in the overall energy consumption worldwide, being responsible for 40% of it. In addition to this, heating, ventilating and air-conditioning (HVAC) systems constitute the largest share in this sector, accounting for 40% of energy usage in construction and 16% globally. To address this, stringent rules and performance measures are essential to reduce energy consumption. This study focuses on mathematical optimisation modelling to enhance the performance of indirect-contact evaporative cooling systems (ICESs), a topic with a significant gap in the literature. This modelling is highly comprehensive, covering various aspects: (1) analysing the impact of the water-spraying unit (WSU) size, working air (WA) velocity and hydraulic diameter (Dh) on the evaporated water vapour (EWV) amount; (2) evaluating temperature and humidity distribution for a range of temperatures without considering humidity at the outlet of the WSU, (3) presenting theoretical calculations of outdoor temperature (Tout) and humidity with a constant WSU size and air mass flow rate (MFR), (4) examining the combined effect of the WA MFR and relative humidity (ϕ) on Tout and (5) investigating how Tout influences the indoor environment’s humidity. The study incorporates an extensive optimisation analysis. The findings indicate that the model could contribute to the development of future low-carbon houses, considering factors such as the impact of Tout on indoor ϕ, the importance of low air velocity for achieving a low air temperature, the positive effects of Dh on outdoor air and the necessity of a WSU with a size of at least 8 m for adiabatic saturation.

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Cooling tower modeling based on machine learning approaches: Application to Zero Liquid Discharge in desalination processes

Bueso,

de Nicolás,

Vera-García

et al. 2024

Applied Thermal Engineering

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Investigation of heat transfer characteristics of deflected elliptical-tube heat exchanger in closed-circuit cooling towers

Cited by 8 publications

References 29 publications

Mechanical Properties and Sulfate Freeze–Thaw Resistance of Calcium Carbonate Whisker-Reinforced Iron Ore Tailings Concrete

Mechanical Properties and Sulfate Freeze–Thaw Resistance of Calcium Carbonate Whisker-Reinforced Iron Ore Tailings Concrete

Contemporary Evaporative Cooling System with Indirect Interaction in Construction Implementations: A Theoretical Exploration

Cooling tower modeling based on machine learning approaches: Application to Zero Liquid Discharge in desalination processes

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