Effect of plates coating on performance of an indirect evaporative cooling system

“…However, the wetted fiber was pointed out the weak antibacterial ability, causing the extra cost of operating maintenance [14]. With respect to the coating, Guilizzoni et al evaluated the contact angle and water retention ability of the surfaces covering standard epoxy coating (STD) and hydrophilic lacquer (HPHI) [15]. Experimental results showed that the HPHI could exert a lower contact angle than STD, which therefore enhances the hydrophilicity in the secondary air channel and achieves 10% cooling capacity enhancement.…”

Section: Literature Reviewmentioning

confidence: 99%

Numerical Study of Indirect Evaporative Cooler Using Porous Media with Dynamic Time-independent Performance Prediction

Wenchao¹,

Shi²,

Min³

et al. 2022

Preprint

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Air conditioning systems consume a large amount of energy with the rising living standard of human beings. Indirect evaporative cooler, which is increasingly recognized as a promising alternative to partially substitute conventional air-conditioning devices, has been studied extensively to improve the cooling efficiency and save energy in buildings.Using porous media in the indirect evaporative heat exchangers is a critical approach for performance enhancement. This paper established a two-dimensional plate-type counterflow indirect evaporative cooler model with porous media on the secondary air channel surface. On the one hand, the porous structure was incorporated in the model to alter the boundary layer and flow status. On the other hand, the water retention ability of porous media that potentially improves the surface wettability has been proven to enable the intermittent operation of the water pump. The influence of various porous parameters, i.e. porosity and pore diameter, on the time-independent dynamic variation of the outlet primary air temperature have been quantitatively analyzed. This study provided a theoretical foundation for the studies of the porous plate-type indirect evaporative cooling technology.

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“…Antonellis et al [7] indicated that a reticular plate protrusion guaranteed a higher heat transfer rate than the flat plates and formed a more uniform water layer than the complex plates. Guilizzoni et al [8] applied a novel material with hydrophilic characteristics on the surface of the plate, which could promote the wet-bulb effectiveness by up to 10%. However, almost all of these solutions have the drawback of high workload and relatively high cost.…”

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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Effect of plates coating on performance of an indirect evaporative cooling system

Cited by 44 publications

References 28 publications

Indirect evaporative cooling for buildings: A comprehensive patents review

Indirect evaporative cooling for buildings: A comprehensive patents review

Numerical Study of Indirect Evaporative Cooler Using Porous Media with Dynamic Time-independent Performance Prediction

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

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