Study on water spraying distribution to improve the energy recovery performance of indirect evaporative coolers with nozzle arrangement optimization

Ma, Xiaochen; Shi, Wenchao; Yang, Hongxing

doi:10.1016/j.apenergy.2022.119212

Cited by 31 publications

(2 citation statements)

References 37 publications

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“…Chen et al performed detailed experimental measurements on a large droplet spray nozzle and found that simple modifications to the nozzle (increasing the length of the mixing chamber by 50%) significantly affect its performance [3]. Ma et al analyzed the performance improvement of indirect evaporative coolers from the perspective of nozzle arrangement and determined the optimal arrangement scheme [4]. Jiwen Cui et al investigated the effects of common geometric deviations, such as diameter error, conicality, and inclination, on the internal and jet flow dynamics [5].…”

Section: Introductionmentioning

confidence: 99%

Optimization Design of Nozzle Structure Inside Boiler Based on Orthogonal Design

Ye,

Xu,

Huang

et al. 2023

Processes

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This article adopts an orthogonal experimental design method to establish a four-factor three-level experimental group by varying the structural parameters at the nozzle outlet, including the number of orifices, orifice diameter, distribution circle diameter, and inclination angle of the base. The three-dimensional jet flow field in the jet pipe was numerically simulated. Through the use of the entropy generation method, Q-criteria, range analysis, and significance test, the working characteristics of the jet pipe were thoroughly investigated. The results show that the orifice diameter has a significant impact on the axial force acting on the jet pipe, while the number of orifices has a minor effect. The distribution circle diameter and inclination angle of the base have very little influence. The final confirmed optimal combination of nozzle structure parameters is as follows: the number of spray holes is 40, the diameter of each spray hole is 1.5 mm, the distribution circle diameter is 22 mm, and the inclination angle of the bottom cover is 30 degrees.

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Section: Introductionmentioning

confidence: 99%

Optimization Design of Nozzle Structure Inside Boiler Based on Orthogonal Design

Ye,

Xu,

Huang

et al. 2023

Processes

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“…It is found that a better spray arrangement can produce larger contact areas and less heat transfer resistance between the two airflows. Ma et al [11] tested the performance of optimized nozzle arrangement on IEC based on the proposed numerical model, which proved that a reasonable arrangement scheme could improve wet-bulb efficiency to 16%. However, some issues persist in the actual operation of a popular IEC product, causing major water evaporation concerns, such as: 1) the sprayed water droplets in unfavorable sizes can cause the drift, in which the liquid particles are carried out by the leaving air stream without evaporation; 2) the water membrane on the plate surface will not be ideal because of the water surface tension and different nozzle working conditions; 3) large unwetted dry regions on the plates cut down the effective heat transfer areas for water evaporation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Spray Nozzle Parameters on Surface Wettability and Performance Improvement of Indirect Evaporative Cooler

Xiaochen¹,

Ma*²,

Shi³

et al. 2022

Preprint

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Indirect evaporative cooling (IEC) is a wellknown sustainable cooling technology that can potentially replace mechanical cooling equipment and operate as an efficient energy recovery unit or standalone cooling system. However, the technology relies heavily on water evaporation in the wet channels to cool the fresh air in the adjacent channel. Although many moisture-absorbing materials have been proposed for IEC to improve the surface wettability, the uneven water membrane coverage caused by inappropriate nozzle parameters is still a great problem that degrades the evaporation. Therefore, it is critical to optimize the nozzle parameters in water spray systems and arrange the nozzles reasonably above the IEC for more efficient evaporation performance. In this research, a novel 3D simulation model describing the vapor and liquid phase distribution from the spray system was developed to allow a comprehensive parametric study based on Computational Fluid Dynamics (CFD). A test rig of an open-circuit wind tunnel was built to measure the actual wetted areas on the surface of a single channel pair for model validation. The results based on the verified simulation model showed that the water membrane coverage ratio could achieve the optimal value of 0.21 as the droplet diameter was 0.05 mm. Furthermore, the wet-bulb efficiency of the IEC with a size of 260 × 400 × 400 mm 3 could reach a maximum value of 52%, supported by two spray nozzles 160 mm apart with a droplet size of 0.05 mm.

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Performance assessment and optimization of water spray strategy for indirect evaporative cooler based on artificial neural network modeling and genetic algorithm

Ma,

Shi,

et al. 2024

Applied Energy

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Study on water spraying distribution to improve the energy recovery performance of indirect evaporative coolers with nozzle arrangement optimization

Cited by 31 publications

References 37 publications

Optimization Design of Nozzle Structure Inside Boiler Based on Orthogonal Design

Optimization Design of Nozzle Structure Inside Boiler Based on Orthogonal Design

Effect of Spray Nozzle Parameters on Surface Wettability and Performance Improvement of Indirect Evaporative Cooler

Performance assessment and optimization of water spray strategy for indirect evaporative cooler based on artificial neural network modeling and genetic algorithm

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