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Relevant bibliographies by topics / Passive Downdraft Evaporative Cooling Tower

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Academic literature on the topic 'Passive Downdraft Evaporative Cooling Tower'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Passive Downdraft Evaporative Cooling Tower"

1

Kang, Daeho, and Richard K. Strand. "Analysis of the system response of a spray passive downdraft evaporative cooling system." Building and Environment 157 (June 2019): 101–11. http://dx.doi.org/10.1016/j.buildenv.2019.04.037.

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Leo Samuel, D. G., S. M. Shiva Nagendra, and M. P. Maiya. "Simulation of indoor comfort level in a building cooled by a cooling tower–concrete core cooling system under hot–semiarid climatic conditions." Indoor and Built Environment 26, no. 5 (March 2, 2016): 680–93. http://dx.doi.org/10.1177/1420326x16635260.

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Concrete core cooling system is an energy efficient alternative to the conventional mechanical cooling system. It provides better comfort due to direct absorption of radiation load, low indoor air velocity, apt vertical temperature gradient and absence of noise. It can be operated at relatively higher water temperature, which facilitates the use of passive cooling strategies. In this study, a cooling tower, which is an ‘evaporative cooling system’, is preferred over other passive cooling options due to its better cooling performance in dry regions and its ability to operate all through the day. This paper presents the results of computational fluid dynamic analysis of a room cooled by concrete core cooling system supported by a cooling tower. The study reveals that for a typical hot–semiarid summer climatic condition in India, the system reduces the average indoor air temperature to a comfortable range of 23.5 to 28℃ from an uncomfortable range of 35.3 to 41℃ in a building without cooling. The average predicted percentage of dissatisfied falls from 99.7% in a building without cooling, to 37.3% if roof and floor of a building are cooled with concrete core cooling system and further to 6.3% if all surfaces are cooled with concrete core cooling system.

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Leo Samuel, DG, SM Shiva Nagendra, and MP Maiya. "A study of pipe parameters on the performance of cooling tower-based thermally activated building system." Indoor and Built Environment 27, no. 2 (September 27, 2016): 219–32. http://dx.doi.org/10.1177/1420326x16670202.

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Passive cooling systems are energy efficient and eco-friendly alternatives to mechanical cooling systems. In this paper, the cooling tower-based thermally activated building system, which acts as an indirect evaporative cooling system, has been investigated using a computational fluid dynamics tool for the hot semi-arid climate of New Delhi. Three design parameters namely spacing, vertical position and arrangement of pipes embedded in the roof and floor were analysed for their influence on the cooling performance of the system. The results indicate that reducing pipe spacing from 0.3 to 0.1 m and moving the pipes closer to the inner surface from 0.135 to 0.015 m could reduce the operative temperatures by 1.6 and 2.7℃, respectively. For the same total water flow rate, a change in pipe arrangement from serpentine to parallel showed insignificant influence on the indoor comfort indices. The best combination of these three parameters can achieve an average operative temperature of 29℃, which is comfortable for the hot semi-arid climate of New Delhi where the adaptive neutral temperature was found to be 29.4℃. This study will contribute to heating, ventilating, air-conditioning designers’ understanding of the importance of these parameters for achieving the required comfort in buildings in India.

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Kang, Daeho, and Richard K. Strand. "Significance of parameters affecting the performance of a passive down-draft evaporative cooling (PDEC) tower with a spray system." Applied Energy 178 (September 2016): 269–80. http://dx.doi.org/10.1016/j.apenergy.2016.06.055.

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5

"Wind Catcher and Trans-evaporative Cooling Residential Integration in Arid Region." International Journal of Thermal and Environmental Engineering 14, no. 1 (2017). http://dx.doi.org/10.5383/ijtee.14.01.001.

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The wind catcher potential for providing occupants comfort conditions is been investigated under trans-evaporative cooling for two-level simple dwelling in arid region. The wind catcher runs on the reverse chimney concept in which the upper wind is captured (by means of passive or active louvers) and is impregnated with moisture that consequently reducing its temperature and increasing its density. This results in a cold downdraft stream in the tower which is used to the conditioning of the dwelling space. This work uses a high fidelity computational fluid dynamics (CFD) of multiple species and two-phase flow to examine the performance of the wind catcher subjected to water injection in the form of mist of 10micron droplet size. The air flow is governed by the none-isothermal Navies-stokes equations which are coupled with energy equation in a conjugated heat transfer in accounting to the inner building walls and the convective conditions for the rest of the building. The water droplet is governed by the discrete phase that also in direct coupling with the continuous phase representing the wind. Flow parameters including velocity, temperature, relative humidity and droplets dispersion are evaluated and their distribution is presented. The setup is tested at different regional conditions manifested in the incoming wind speed, present relative humidity level and temperature sensitivity. Results show that in the average UAE summer conditions (42o C and 50% R. humidity) the role of wind catcher in evaporative cooling was deemed unimportant. However under pre-dehumidification near 25% R. humidity a significant temperature drop of 10 o C and reasonable R. humidity of near 60% can be obtained when integrating wind catcher to isolated dwellings.

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"Assessment of Passive Downdraft Evaporative Cooling Technique for Environmental Sustainability in Buildings." International Journal of Research in Chemical, Metallurgical and Civil Engineering 3, no. 2 (October 9, 2016). http://dx.doi.org/10.15242/ijrcmce.u1016309.

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7

Alaidroos, Alaa, and Moncef Krarti. "Evaluation of Passive Cooling Systems for Residential Buildings in the Kingdom of Saudi Arabia." Journal of Solar Energy Engineering 138, no. 3 (April 5, 2016). http://dx.doi.org/10.1115/1.4033112.

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In this paper, passive cooling strategies have been investigated to evaluate their effectiveness in reducing cooling thermal loads and air conditioning energy consumption for residential buildings in Kingdom of Saudi Arabia (KSA). Specifically, three passive cooling techniques have been evaluated including natural ventilation, downdraft evaporative cooling, and earth tube cooling. These passive cooling systems are applied to a prototypical KSA residential villa model with an improved building envelope. The analysis has been carried using detailed simulation tool for several cities representing different climate conditions throughout KSA. The impact of the passive cooling systems is evaluated on both energy consumption and electrical peak demand for residential villas with and without improved building envelope for five cities, representatives of various climate conditions in KSA. It is found that both natural ventilation and evaporative cooling provide a significant reduction in cooling energy use and electrical peak demand for the prototypical villa located in dry KSA climates such as that of Riyadh and Tabuk. Natural ventilation alone has reduced the cooling energy end-use by 22%, while the evaporative cooling system has resulted in 64% savings in cooling energy end-use. Moreover, the natural ventilation is found to have a high potential in all KSA climates, while evaporative cooling can be suitable only in hot and dry climates such as Riyadh and Tabuk. Finally, the analysis showed that natural ventilation provided the lowest electrical peak demand when applied into the improved envelope residential buildings in all five cities in KSA.

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Dissertations / Theses on the topic "Passive Downdraft Evaporative Cooling Tower"

1

"Advancing Performance of Passive Downdraft Cooling Towers." Doctoral diss., 2017. http://hdl.handle.net/2286/R.I.46229.

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abstract: Passive cooling techniques, specifically passive downdraft cooling (PDC), have proven to be a solution that can address issues associated with air conditioning (AC). Globally, over 100 buildings have integrated PDC in its different forms, most of which use direct evaporative cooling. Even though all surveyed buildings were energy efficient and cost-effective and most surveyed buildings were thermally comfortable, application of PDC remains limited. This study aims to advance performance of the single stage passive downdraft evaporative cooling tower (PDECT), and expand its applicability beyond the hot dry conditions where it is typically used, by designing and testing a multi-stage passive and hybrid downdraft cooling tower (PHDCT). Experimental evaluation on half-scale prototypes of these towers was conducted in Tempe, Arizona, during the hot dry and hot humid days of Summer, 2017. Ambient air dry-bulb temperatures ranged between 73.0°F with 82.9 percent coincident relative humidity, and 123.4°F with 7.8 percent coincident relative humidity. Cooling systems in both towers were operated simultaneously to evaluate performance under identical conditions. Results indicated that the hybrid tower outperformed the single stage tower under all ambient conditions and that towers site water consumption was at least 2 times lower than source water required by electric powered AC. Under hot dry conditions, the single stage tower produced average temperature drops of 35°F (5°F higher than what was reported in the literature), average air velocities of 200 fpm, and average cooling capacities of 4 tons. Furthermore, the hybrid tower produced average temperature drops of 45°F (50°F in certain operation modes), average air velocities of 160 fpm, and average cooling capacities exceeding 4 tons. Under hot humid conditions, temperature drops from the single stage tower were limited to the ambient air wet-bulb temperatures whereas drops continued beyond the wet-bulb in the hybrid tower, resulting in 60 percent decline in the former’s cooling capacity while maintaining the capacity of the latter. The outcomes from this study will act as an incentive for designers to consider incorporating PDC into their designs as a viable replacement/supplement to AC; thus, reducing the impact of the built environment on the natural environment.
Dissertation/Thesis
Doctoral Dissertation Architecture 2017

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Conference papers on the topic "Passive Downdraft Evaporative Cooling Tower"

1

Alaidroos, Alaa, and Moncef Krarti. "Impact of Passive Cooling Strategies on Energy Consumption Reduction of Residential Buildings in the Kingdom of Saudi Arabia." In ASME 2015 9th International Conference on Energy Sustainability collocated with the ASME 2015 Power Conference, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/es2015-49128.

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In this paper, passive cooling strategies have been investigated to evaluate their effectiveness in reducing cooling thermal loads and air conditioning energy consumption for residential buildings in Kingdom of Saudi Arabia (KSA). Specifically, three passive cooling techniques have been evaluated including: natural ventilation, downdraft evaporative cooling, and earth tube cooling. These passive cooling systems are applied to a prototypical KSA residential villa model with an improved building envelope. The analysis has been carried using detailed simulation tool for several cities representing different climate conditions throughout KSA. It is found that both natural ventilation and evaporative cooling provide a significant reduction in cooling energy for the prototypical villa located in Riyadh. Natural ventilation alone has reduced the cooling energy end-use by 22% and the total villa energy consumption by 10%, while the evaporative cooling system has resulted in 64% savings in cooling energy end-use and 32% in the total villa energy consumption. When applying both passive cooling systems together to the villa, the cooling energy end-use is significantly reduced by about 84.2% and the total villa energy savings by 62.3% relative to the un-insulated basecase residential building model. Moreover, natural ventilation is found to have a high potential in all KSA climates, while evaporative cooling can be suitable only in hot and dry climates such as Riyadh and Tabuk.

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2

Bahadori, Mehdi N., and Amir R. Pakzad. "Performance Evaluation of New Designs of Wind Towers." In ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/fedsm2002-31247.

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Wind towers are architectural designs employed for natural ventilation and passive cooling of buildings. In this study, it is shown that the performance of these towers can be improved appreciably by incorporating evaporative cooling in them. Two designs, called wetted columns and wetted surfaces, were employed, and their performances were evaluated and compared with those of the conventional towers. It is found that both designs can deliver air to the building they serve at higher flow rates and at temperatures very near the ambient air wet-bulb temperatures. In general, the wind tower with wetted columns performs better in areas with relatively high wind speeds, whereas the designs with wetted surfaces performs better in areas with no winds, or with very low wind speeds.

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Reports on the topic "Passive Downdraft Evaporative Cooling Tower"

1

Mignon, G. V., W. A. Cunningham, and T. L. Thompson. Passive cooling with solar updraft and evaporative downdraft chimneys. Office of Scientific and Technical Information (OSTI), January 1985. http://dx.doi.org/10.2172/6983633.

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Cunningham, W. A., and G. V. Mignon. Establishing feasibility for providing passive cooling with solar updraft and evaporative downdraft chimneys. Office of Scientific and Technical Information (OSTI), January 1986. http://dx.doi.org/10.2172/7105343.

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Cunningham, W. A., G. V. Mignon, and T. L. Thompson. Establish feasibility for providing passive cooling with solar updraft and evaporative downdraft chimneys. Office of Scientific and Technical Information (OSTI), January 1987. http://dx.doi.org/10.2172/6967287.

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Cunningham, W. A., and G. V. Migon. Establishing feasibility for providing passive cooling with solar updraft and evaporative downdraft chimneys. Office of Scientific and Technical Information (OSTI), January 1985. http://dx.doi.org/10.2172/7244469.

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Mignon, G. V., W. A. Cunningham, and T. L. Thompson. Passive cooling with solar updraft and evaporative downdraft chimneys. Interim report, June 15, 1984--March 1, 1985. Office of Scientific and Technical Information (OSTI), December 1985. http://dx.doi.org/10.2172/10184131.

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Cunningham, W. A., and G. V. Mignon. Establishing feasibility for providing passive cooling with solar updraft and evaporative downdraft chimneys. Progress report, October 1985--February 1986. Office of Scientific and Technical Information (OSTI), December 1986. http://dx.doi.org/10.2172/10184654.

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7

Cunningham, W. A., and G. V. Migon. Establishing feasibility for providing passive cooling with solar updraft and evaporative downdraft chimneys. Progress report, March 1985--September 1985. Office of Scientific and Technical Information (OSTI), December 1985. http://dx.doi.org/10.2172/10184758.

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8

Cunningham, W. A., G. V. Mignon, and T. L. Thompson. Establish feasibility for providing passive cooling with solar updraft and evaporative downdraft chimneys. Final report, June 15, 1984--December 31, 1987. Office of Scientific and Technical Information (OSTI), December 1987. http://dx.doi.org/10.2172/10184763.

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