Estimating the performance of natural draft evaporative coolers

Thompson, Thomas L.; Chalfoun, Nader; Yoklic, Martin

doi:10.1016/0196-8904(94)90022-1

Cited by 10 publications

(8 citation statements)

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“…For the wind tower with wetted surfaces, DP e includes the pressure losses due to the flow of air through the evaporative cooling pads. The energy equations written for various sections of each wind tower, along with the equations determining the air flow, were solved simultaneously, employing appropriate relations given for various terms in these equations [7][8][9][10][11][12][13][14][15].…”

Section: Article In Pressmentioning

confidence: 99%

Experimental investigation of new designs of wind towers

2008

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Two new designs of wind towers were tested side by side with a conventional wind tower in the city of Yazd, Iran. All the towers were of identical dimensions. The two new designs were one with wetted column, consisting of wetted curtains hung in the tower column, and the other one with wetted surfaces, consisting of wetted evaporative cooling pads mounted at its entrance. The air temperature leaving the wind towers with evaporative cooling provisions were much lower than the air temperature leaving the conventional design, and its relative humidity much higher. The air-flow rate was reduced slightly in these new towers. It was found that the wind tower with wetted column performs better with high wind speeds whereas the tower with wetted surfaces performs better with low wind speeds. It is recommended that these new designs of wind towers should be manufactured in different sizes and incorporated in the designs of new buildings. They can replace the evaporative coolers currently employed in Iran, and other hot arid regions, with considerable saving in electrical energy consumption. r

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Section: Article In Pressmentioning

confidence: 99%

Experimental investigation of new designs of wind towers

2008

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“…The design source book also introduced a case study in Federal Courthouse, Phoenix, AZ, USA in 2007 [5]. The building is a six-story building with the floor area of 46,500m 2 . It uses a spray PDEC system to control a large open atrium and ventilates the air through a bottom and top outlets.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The EnergyPlus program has been extensively validated and widely used in that it is capable of modeling various physical phenomena simultaneously taking place in buildings and their surroundings [36][37][38][39]. The authors implemented the analytical models (equation 1and (2)) that predict the supply air temperature and velocity in the EnergyPlus program [25]. The implementation of the analytical models enabled the prediction of the cooling performance of a spray PDEC system and also the predictions of all physical phenomena in buildings and their surroundings.…”

Section: Simulation Descriptionmentioning

confidence: 99%

“…A spray passive down-draft evaporative cooling (PDEC) system is a component that is designed to capture the wind at the top of a tower and cools the outdoor air using water evaporation [1]. It is often described as a reverse thermal chimney as the air flows downward through chimney-like tower rather than upward as in a thermal chimney [2]. The air flow through the PDEC tower is natural as the momentum of the inflows through a wind catcher pressurizes in conjunction with an increase in the density of the inflows during the down-draft evaporative cooling process.…”

Section: Introductionmentioning

confidence: 99%

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Performance control of a spray passive down-draft evaporative cooling system

Kang

Strand

2018

Applied Energy

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A spray passive down-draft evaporative cooling system has been regarded as a low-energy cooling system that leads significant energy savings in the cooling of buildings. While the energy saving capability of the system has been proven, the ability to control a comfortable indoor environment is still inadequate due to strong climatic dependency. This study seeks viable solutions to advance the control competence of the system by mitigating critical problems of the system to be a reliable cooling application in the cooling of buildings. It proposes potential control strategies for the system and alternative operations. It develops a control algorithm for the proposed control strategies and implements the algorithm in EnergyPlus. A simulation analysis follows to examine the functionality of each proposed control strategy and alternative operations. The results of the simulations ascertain that a spray PDEC system with a water flow control performs better. In addition, a spray PDEC system contributes most when it operates as a secondary cooling system to abate space cooling loads and to maintain a steady thermal environment by reducing 62.1% electricity for space cooling and 47.9% water consumption in a warm-moderate climate.

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“…While the column of warm air rises in a chimney, in this case the column of cool air falls. The air flow rate depends on the efficiency of the evaporative cooling device, tower height and cross section, as well as the resistance to air flow in the cooling device, tower and structure (if any) into which it discharges [7].…”

Section: Contemporary Applications Of Passive Downdraft Evaporativmentioning

confidence: 99%

Assessment of Passive Downdraft Evaporative Cooling Technique for Environmental Sustainability in Buildings

2016

IJRCMCE

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There has been a drastic increase in the use of air conditioning system for cooling the buildings all around the world. Interest on reducing emission of greenhouse gases, caused by fossil fuels to power the cooling requirements of the buildings has stimulated the interest towards adoption of passive cooling techniques for buildings. Passive downdraught evaporative cooling (PDEC) is a passive cooling technique which involves spraying of controlled volumes of microscopic water droplets into hot, dry ambient air, thereby causing it to cool and descend into a required capture zone within a building. This paper provides a study of Passive Downdraught Evaporative Cooling (PDEC) as a passive cooling technique for providing thermal comfort and its significance in energy conservation in buildings has been done. The interrelationship between sustainability and cooling needs of buildings has also been discussed. Further two applications of PDEC in contemporary architecture (Torrent Research Centre, Ahmedabad, India and New office building at Catania, Italy) have also been analyzed. Finally a critical analysis of using PDEC system in the buildings has also been done.

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Estimating the performance of natural draft evaporative coolers

Cited by 10 publications

References 1 publication

Experimental investigation of new designs of wind towers

Experimental investigation of new designs of wind towers

Performance control of a spray passive down-draft evaporative cooling system

Assessment of Passive Downdraft Evaporative Cooling Technique for Environmental Sustainability in Buildings

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