Passive downdraught evaporative cooling: principles and practice

Ford, Brian

doi:10.1017/s1359135501001312

Cited by 28 publications

(27 citation statements)

References 1 publication

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“…The height of PDEC tower has also been identified as an important design parameter which affects the performance of the system significantly [6,7,11,13,25]. While some studies show that the relationship between the PDEC tower height and the performance is not linear, it is true that it has a significant impact on the performance [18,25].…”

Section: Tower Heightmentioning

confidence: 99%

“…Different types of evaporative devices such as wetted pads and water sprays are attached to wind towers in order to improve their performance, accelerating the direct evaporative cooling process by expanding direct contact between the incoming outdoor air and water added to the air stream via evaporation. The addition of evaporative devices to wind towers has been proven to significantly improve the cooling performance of the advanced forms of wind towers [8,[12][13][14][15]. To date, these types of PDEC towers have been integrated into the built environment in a number of buildings, but the technology has not seen widespread implementation.…”

Section: Introductionmentioning

confidence: 99%

“…PDEC towers have been reported to achieve considerable energy savings and improved indoor environmental quality [8,[13][14][15][16][17]. On the other hand, some http researchers have reported that, due to their climatic dependency, PDEC towers struggle to maintain a comfortable indoor environment in comparison to conventional mechanical cooling systems [9,11,13,18,19]. Additionally, previous studies focused mostly on the quantification of energy savings even though PDEC towers affect extensively the indoor thermal environment and indoor air quality.…”

Section: Introductionmentioning

confidence: 99%

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Significance of parameters affecting the performance of a passive down-draft evaporative cooling (PDEC) tower with a spray system

Kang

Strand

2016

Applied Energy

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h i g h l i g h t sIt demonstrates the significance of main parameters including those have not been well treated in the literature. It presents practical design guidelines for main parameters so as to significantly improve the performance of the system. It ensures that the performance of the system varies with many factors, rather than one dominant factor. It formulates two mathematical models that predict outlet air temperature and velocity. a b s t r a c t PDEC towers with spray systems are known to achieve substantial energy savings. Various parameters such as the wet-bulb depression, the tower height, and the wind speed have been known to be key factors affecting the performance of the system. To date, the significance of these parameters and other important factors have not been adequately treated in the literature. There also has been a lack of models that can successfully investigate potential benefits of the system under various conditions where this particular system could be applicable. To address these critical issues, this study performed a parametric analysis by using a FLUENT model validated against experimental data. It demonstrated the significance of individual parameters including water droplet sizes. As a result, practical design guidelines for important system parameters were presented. A statistical analysis was then used to formulate analytic models that account for all of the relationships found in this study between the parameters and the supply air conditions of the system. Two regression equations were formulated for predicting supply air temperature and velocity.

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Section: Tower Heightmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Significance of parameters affecting the performance of a passive down-draft evaporative cooling (PDEC) tower with a spray system

Kang

Strand

2016

Applied Energy

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“…For an overview of select projects and their effectiveness, see Ford (2001). Indoor temperatures can be ten degrees cooler than outdoor temperatures, depending on the context, but PDEC has yet to reach mainstream anywhere in the world.…”

Section: Contemporary Buildings Designed With Pdec Have Been Construcmentioning

confidence: 99%

Keeping Cool in Southeast Asia

Sahakian¹

2014

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“…1 We are now at a stage where a substantial technical knowledge has been generated on pdec and a few pioneering buildings effectively showcase the use of such system and design approach, as an alternative to mechanical cooling. Two previous arq articles by Professor Brian Ford report on various aspects of pdec design.…”

Section: Environmental Retrofit: Building Integrated Passive Cooling mentioning

confidence: 99%

Environmental retrofit: building integrated passive cooling in housing

Schiano-Phan¹

2010

Arq

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As the existing housing stock ages throughout Europe, retrofitting offers many opportunities for the substantial improvement of the energy performance of residential buildings and the provision of sustainable alternatives to conventional heating and cooling. The effect of global warming is leading to a widespread use of air conditioning in existing and new residential buildings. This potentially implies an increase in cooling energy and adverse environmental effects on an unprecedented scale. In the hot and dry climate of many south European cities, this could be avoided with the use of an innovative wall integrated passive evaporative cooling system, which harnesses air, water and porous ceramic to provide comfortable indoor conditions. Dr Rosa Schiano-Phan discusses the applicability of such a system to the urban context of Seville in the light of the current Spanish regulatory framework and recent developments of European energy performance standards.

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Passive downdraught evaporative cooling: principles and practice

Cited by 28 publications

References 1 publication

Significance of parameters affecting the performance of a passive down-draft evaporative cooling (PDEC) tower with a spray system

Significance of parameters affecting the performance of a passive down-draft evaporative cooling (PDEC) tower with a spray system

Keeping Cool in Southeast Asia

Environmental retrofit: building integrated passive cooling in housing

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