CFD analysis of the impact of physical parameters on evaporative cooling by a mist spray system

Montazeri, Hamid; Blocken, Bje Bert; Hensen, Jlm Jan

doi:10.1016/j.applthermaleng.2014.09.078

Cited by 118 publications

(56 citation statements)

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“…In similar research work, the research group led by Blocken presented excellent comparisons [59][60][61][62][63][64]. However, if the experimental data is not easily obtainable due to difficulty in experiments or incomplete experiments, a commonly used method is to perform sub-configuration validation whose actual configuration consists of a number of generic sub-configurations, each of which contains one or several salient flow features in the actual configuration [58,65,66].…”

Section: Validation Proceduresmentioning

confidence: 99%

“…However, if the experimental data is not easily obtainable due to difficulty in experiments or incomplete experiments, a commonly used method is to perform sub-configuration validation whose actual configuration consists of a number of generic sub-configurations, each of which contains one or several salient flow features in the actual configuration [58,65,66]. Here, the authors of this article used the similar mathematical models and boundary conditions as shown in [59][60][61]65,66] where the CFD method verified in previous work has been also verified to be acceptable for the numerical analysis of the present research work. [41,42].…”

Section: Validation Proceduresmentioning

confidence: 99%

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Improvement of Air Quality and Thermal Environment in an Old City District by Constructing Wind Passages

et al. 2015

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A case study in an old city district with hot-humid climatic conditions in Wuhan, China was conducted to explore the potential renewal strategies favorable to the local residents and pedestrians. For this purpose, a comprehensive mathematical model considering the parameters such as ambient crosswind, solar radiation, natural convection, and a previously established heat transfer mechanism was employed to analyze the fluid flow and heat transfer characteristics of the study area. In addition, in the urban renewal process, five alternative renewal strategies, namely, Central Demolition (CD) Plan, Edge Demolition (ED) Plan, Wedge Shape Demolition (WSD) Plan, "L" Shape Demolition (LSD) Plan, and Cross Shape Demolition (CSD) Plan, were adopted to improve the thermal and ventilation environment of Wuhan old city district. Through simulation analysis, the temperature and velocity distributions of the original urban layout and five alternative renewal strategies were compared. It is found that the construction of an air passage within the old city district can improve the local air quality, air ventilation, and thermal environment to some extent. Among the five alternative strategies to construct air passages, CSD Plan is much better than the others. Accordingly, corresponding suggestions and strategies for urban renewal were presented. OPEN ACCESSSustainability 2015, 7 12673

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Section: Validation Proceduresmentioning

confidence: 99%

Section: Validation Proceduresmentioning

confidence: 99%

Improvement of Air Quality and Thermal Environment in an Old City District by Constructing Wind Passages

et al. 2015

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“…A number of experimental studies [15,19,33,37] and computational fluid dynamics models [5,33,38,42,43,45,118] have been carried out on spray cooling performance. Spray is a two-phase flow phenomenon and experience several actions when injected into air including heat, mass and momentum transfer.…”

Section: Spray Simulationsmentioning

confidence: 99%

“…A numerical investigation on evaporating sprayed airflow was conducted by Tissot et al [43] A recent parametric study conducted by Montazeri et al [45] using three-dimensional CFD simulation to investigate the influence of different spray characteristics parameters on spray cooling performance under different inlet air conditions. The effect of droplet size distribution, droplet temperature, air temperature, air humidity and air velocity on spray cooling performance was investigated.…”

Section: Air Conditioning and Refrigerationmentioning

confidence: 99%

“…It is evident that spray characteristics plays a significant role in droplet transport and evaporation, and air cooling effectiveness [40,45]. It is essential to obtain detailed information of spray characteristics (droplet size, droplet velocity, cone angle and pattern) for better understanding of droplet transport and evaporation, and spray cooling efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Modelling and experimental study of spray cooling systems for inlet air pre-cooling in natural draft dry cooling towers

Alkhedhair¹

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Geothermal energy is a promising renewable energy to be used for baseload electricity. Most potential sites with high geothermal temperature are mostly located in remote areas where water is limited. This is besides water scarcity and environmental protection, which made dry cooling systems a better alternative solution for heat rejection of power plants. Furthermore, natural draft cooling towers have the advantage of avoiding parasitic losses introduced by the fans at mechanical draft cooling towers. However, power plants utilizing dry cooling technologies experience a significant reduction in power generation during high ambient temperature periods. This reduction often goes along with the peak power demand which results in a great loss for the power plant owners. In certain instances, dry cooling tower performance can be enhanced during these periods by pre cooling of the inlet air by spraying atomized water into the inlet air.The present study introduces the use of spray cooling for inlet air pre-cooling in natural draft cooling towers. Spray cooling is investigated in this study due to its simplicity, low capital cost, ease of operation and maintenance, and capability of increasing power plant efficiency while consuming only a small amount of water compared to wet cooling towers or other evaporative cooling methods. Although spray cooling has found successful applications in process coolers and gas turbine inlet air cooling, the large scale applications in power industry have been limited.Several issues limit the application in power industry. The main one is the incomplete evaporation of water droplets which can cause corrosion and scaling of heat exchanger surface. Incomplete evaporation also increases operational cost due to water consumption. To the best of our knowledge, a detailed investigation of the spray cooling performance in natural draft dry cooling towers operating environment has not yet been performed. The aim of the current work is to optimise a spray cooling system for inlet air pre-cooling in natural draft dry cooling towers.In the present study, an Eulerian-Lagrangian 3-D numerical model was developed which is capable of simulating evaporating water sprays produced by real nozzles. In order to reproduce real nozzle characteristics in the simulation, a new adaptable method for hollow-cone spray representation in Eulerian-Lagrangian numerical models was developed. This allows real nozzles characterised during experiments to be included in the simulation, thereby correctly accounting for radial evolution of droplet size distribution and air/droplets momentum exchange. The CFD model was applied to calculate local droplet transport and evaporation, and spray cooling efficiency at different operating conditions for spray cooling systems optimisation under typical Natural Draft Dry Cooling Tower conditions.iii Experimental measurements from a wind tunnel test rig simulating Natural Draft Dry Cooling Tower inlet flow conditions have been performed in order to investigate droplet transport...

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Analysis of the performance of direct contact heat exchange systems for application in mine waste heat recovery

Kalantari

Amiri

Ghoreishi‐Madiseh

2021

Intl J of Energy Research

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Due to their relatively high thermal effectiveness and ease-of-use, direct contact heat exchange units are a favorable choice in heat recovery applications. Today, spray-based direct heat exchangers are commonly used for a variety of applications, including evaporative cooling and heat recovery. Yet in spite of their versatility, these heat exchangers are not well-understood, mainly due to their complex liquid/gas interactions, which may deem poorly-designed systems as undesirable and infeasible. Spray nozzle height and type (hollow and full cone), droplet diameter distribution, inlet air velocity and humidity, and water spray velocity are key parameters required to establish a clear understanding of direct heat exchange performance. To better understand such a multivariable phenomenon, this article offers a comprehensive study of the impact of these key factors. The main purpose of this study is to evaluate the validity of two different methods proposed for evaluating the performance of heat and mass transfer in large-scale direct contact heat exchangers, namely one-dimensional and threedimensional approaches. The results of the present study show that while the one-dimensional approach is able to capture the experimental data within 10% of agreement with experiment, the three-dimensional approach reduces this error to 5%. In addition, this study aims to provide a framework to conduct future parametric studies with the goal of highlighting key performance factors understanding of which are a necessity for improved design of direct contact heat exchangers used in mine waste heat recovery applications.

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CFD analysis of the impact of physical parameters on evaporative cooling by a mist spray system

Cited by 118 publications

References 59 publications

Improvement of Air Quality and Thermal Environment in an Old City District by Constructing Wind Passages

Improvement of Air Quality and Thermal Environment in an Old City District by Constructing Wind Passages

Modelling and experimental study of spray cooling systems for inlet air pre-cooling in natural draft dry cooling towers

Analysis of the performance of direct contact heat exchange systems for application in mine waste heat recovery

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