Numerical investigation on the heat and mass transfer in a direct evaporative cooler

Wu, Jiangbo; Huang, Xiang; Zhang, H.

doi:10.1016/j.applthermaleng.2008.02.018

Cited by 102 publications

(46 citation statements)

References 12 publications

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“…The performance and efficiency of evaporative coolers has been the object of investigation of numerous scientific groups during the past decades and the exported results are quite interesting• most recently, papers were published by Fouda & Melikyan (2011), Kachhwaha & Prabhakar (2010), Lazzarin (2007), Wu, Huang & Zhang, (2009), Finlay & Harris (1984. The approaches adopted in these papers are based on analyzing heat and mass transfer phenomena or on the balance between sensible and latent energy load.…”

Section: Mathematical Model Of Direct Evaporative Coolers and Assumptionsmentioning

confidence: 99%

Estimation of the Water Temperature Influence on Direct Evaporative Cooler Operation

Tertipis¹,

Rogdakis²,

Koronaki³

2013

Int. J. Thermo

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In the present paper a study is conducted of the mass and heat transfer phenomena which rule the function of a direct evaporative cooler. A comprehensive mathematical model is developed, which is based on the latent and sensible heat transfer and can predict the efficiency of such a cooler under any circumstances of operation and water supply. As a development of the existing simulation models of direct evaporative coolers, the model presented here is general, as far as the temperature of the supply water is concerned as an independent parameter. In addition, direct evaporative cooling is evaluated according to its efficiency, the quality of produced air and the specific consumption of water while working in Mediterranean climates.

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Section: Mathematical Model Of Direct Evaporative Coolers and Assumptionsmentioning

confidence: 99%

Estimation of the Water Temperature Influence on Direct Evaporative Cooler Operation

Tertipis¹,

Rogdakis²,

Koronaki³

2013

Int. J. Thermo

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“…The latent heat follows the water vapor and diffuses into the air. The minimum temperature that can be obtained is the wetbulb temperature of the entering air [6][7][8]. Furthermore, due to growing environmental concerns and stringent environmental regulations enforced worldwide on particulate emissions from various sources, attention was driven into alternative technologies that are simple, cost effective and exhibit a high performance when removing particulate matter from industrial effluents.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Cooling Effect of an Electrostatic Wet Scrubber

Almuhanna¹

2016

IOSR

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“…Wu et al's model is able to predict the temperature and humidity ratio distributions for air flow in the wetted medium zone and thus is helpful for the design and operation of direct evaporative cooler in engineering applications. Fouda et al [107] simplified Wu et al's model [106] to 1-D but unsteady-flow. A program composed in FORTRAN language was developed to solve the governing equations and to determine the parametrical values of direct evaporative cooler.…”

Section: Mathematical Modelsmentioning

confidence: 99%

“…Wu et al [106] developed a 2-D steady-flow model to describe the heat and mass transfer between water and air in a direct evaporative cooler. The evaporated water was treated as a mass source of air flow, and the related latent heat of water evaporation was taken as a heat source in energy equation.…”

Section: Mathematical Modelsmentioning

confidence: 99%

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Performance improvement of natural draft dry cooling towers using wetted-medium evaporative pre-cooling

He¹

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A cooling tower is a heat rejection device which extracts waste heat to the atmosphere. A Natural Draft Dry Cooling Tower (NDDCT) is an alternative cooling method when large quantities of water are not available. Examples of the proposed applications are the enhanced geothermal and concentrated solar thermal (CST) power plants in Australia and the rest of the world, most of which are expected to be constructed in dry climates. Unfortunately, the performance of a NDDCT is severely reduced when the ambient air is hot, which is because the NDDCT is driven by buoyancy effect and relies solely on air to cool the working fluid.Reduced cooling tower performance lowers the efficiency of the thermal power stations they are serving. The conventional solution is to use wet cooling towers but this solution consumes large quantities of water. The present project introduces inlet air pre-cooling using wetted media, which limits water consumption only to the periods when the system is used at high ambient temperatures. However, wetted-medium cooling introduces extra pressure drop which reduces the air flow passing through the tower and thus impairs the tower heat rejection. To this end, this project takes into account the trade-off between the wettedmedium cooling and the extra pressure drop, aiming to optimize the performance of a proposed NDDCT when evaporatively pre-cooled using different types of wetted media.An extensive literature review was conducted and the promising wetted media were selected for further study. Four wetted media, i.e., two film media (Cellulose7060 and PVC1200) and two trickle media (Trickle125 and Trickle100), were selected and were experimentally studied in UQ Gatton wind tunnel under different working conditions that represented NDDCT's operation. The medium performance correlations, i.e., the cooling efficiency, heat transfer coefficient and pressure drop, were obtained based on the experimental study. The test results were then used to simulate the operations of pre-cooled NDDCTs to investigate the alterations of tower performance (A MATLAB program was developed to fulfil this task).Finally, the most promising wetted medium together with its performance characteristics were recommended for future pre-cooling application.The main findings of the thesis are:(1) Choosing a suitable wetted medium for a specific application requires knowledge of different working parameters. Not only the balance between the cooling potential and the extra pressure drop, but also the consideration of medium cost, service life, type of process to be cooled, environmental conditions, water quality, space availability, locations and economic requirements are absolutely necessary, and some trade-offs have to be made.(2) The experimental studies of the four selected media found that: (a). Film media (e.g., Cellulose7060 and PVC1200) offer higher cooling efficiencies and pressure drops when compared with trickle media (e.g., Trickle125 and Trickle100). Cellulose7060 is found no water entrainment, however, care must b...

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Numerical investigation on the heat and mass transfer in a direct evaporative cooler

Cited by 102 publications

References 12 publications

Estimation of the Water Temperature Influence on Direct Evaporative Cooler Operation

Estimation of the Water Temperature Influence on Direct Evaporative Cooler Operation

Enhancing the Cooling Effect of an Electrostatic Wet Scrubber

Performance improvement of natural draft dry cooling towers using wetted-medium evaporative pre-cooling

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