Two-phase Euler-Lagrange CFD simulation of evaporative cooling in a Wind Tower

Saffari, Hamid; Hosseinnia, Seyed Mojtaba

doi:10.1016/j.enbuild.2009.05.006

Cited by 56 publications

(39 citation statements)

References 7 publications

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“…The use of wetted curtains suspended inside the column implies smaller droplets, therefore the total evaporation surface is greater and this enhances the reduction of the air temperature through the tower (Saffari & Hosseinnia, 2009). Moreover, the exiting air temperature is more sensitive to the inlet air temperature, rather than to its relative humidity (Saffari & Hosseinnia, 2009).…”

Section: Downdraught Cooling and Ventilation Towersmentioning

confidence: 99%

“…Moreover, the exiting air temperature is more sensitive to the inlet air temperature, rather than to its relative humidity (Saffari & Hosseinnia, 2009). Also further studies highlight the effectiveness of wetted surfaces, such as cooling pads, which may lead to a temperature reduction of up to 15 C (Hughes, Calautit, & Ghani, 2012).…”

Section: Downdraught Cooling and Ventilation Towersmentioning

confidence: 99%

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The impact of ventilation cooling towers on plus energy houses in southern Europe

Babich

Cook

Cremers

et al. 2017

International Journal of Ventilation

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Cooling homes is often important to maintain acceptable internal comfort. This can be achieved by both active and passive solutions. This research focused on passive systems and has examined one hypothesis, that evaporative cooling towers are an important element of plus-energy houses in southern Europe. Refinements to the design of the existing ventilation tower of a Solar Decathlon House developed by the Hochschule f€ ur Technik Stuttgart are proposed and tested in eight locations in Greece, Italy, Portugal and Spain using dynamic thermal and computational fluid dynamics simulations in order to predict energy consumption, mean and peak CO 2 levels, temperatures, ventilation rates, cooling potential, fresh air distribution, indoor air quality and water consumption of the evaporative cooling system implemented within the tower. Results show that a 50% reduction of the annual energy demand for space cooling to be satisfied by other systems is achieved without compromising the internal comfort.

show abstract

Section: Downdraught Cooling and Ventilation Towersmentioning

confidence: 99%

Section: Downdraught Cooling and Ventilation Towersmentioning

confidence: 99%

The impact of ventilation cooling towers on plus energy houses in southern Europe

Babich

Cook

Cremers

et al. 2017

International Journal of Ventilation

View full text Add to dashboard Cite

show abstract

“…The review of current literature showed that significant research interest has been focused on a number of areas relating to the development of windcatcher technology [8][9][10][11][12][13][14][27][28][29][30] and its integration with cooling methods [23][24][25][26] such as heat pipes [15][16][17][18]. The research gaps that this study aims to address are the following; (1) There are limited studies on the experimental investigation of commercial windcatchers, particularly using field test method.…”

Section: Figurementioning

confidence: 99%

“…The study introduced new types of systems; Baudgeer with wetted columns (un-glased ceramic conduits, see Figure 1) and with wetted surfaces (series of straws). Saffari and Hosseinnia [23] used CFD modelling to analyse the cooling potential of a wind tower with wetted curtains inside the channel. The results showed that a 10m wetted curtain was capable of reducing the ambient airflow temperature by 12°C.…”

Section: Figurementioning

confidence: 99%

Climatic analysis of a passive cooling technology for the built environment in hot countries

2017

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The aim of this work was to determine the ventilation and cooling potential of a passive cooling windcatcher operating under hot climatic conditions by replicating the monthly wind velocity, wind direction, temperature and relative humidity (RH) observed in a hot-desert city. The city of Ras-Al-Khaimah (RAK), UAE was used as the location of the case-study and available climatic data was used as inlet boundary conditions for the numerical analysis. The study employed the CFD code FLUENT 14.5 with the standard k-model to conduct the steady-state RANS simulation. The windcatcher model was incorporated to a 3 x 3 x 3 m 3 test room model, which was identical to the one used in the field test. Unlike most numerical simulation of windcatchers, the work will simulate wind flows found in sub-urban environment. The numerical model provided detailed analysis of the pressure, airflow and temperature distributions inside the windcatcher and test room model. Temperature and velocity profiles indicated an induced, cooler airflow inside the room; outside air was cooled from 38˚C to 26-28˚C, while the average induced airflow speed was 0.59 m/s (15% lower compared to a windcatcher w/out heat pipes). Field testing measurements were carried out in the Jazira Hamra area of RAK during the month of September. The test demonstrated the positive effect of the integration of heat pipes on the cooling performance but also highlighted several issues. The comparison between the measured and predicted supply temperatures were in good agreement, with an average error of 3.15%.

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“…The results indicated that the tower with wetted column was more effective during high wind conditions while the tower with wetted surfaces was more effective during low wind conditions. Safari and Hosseinnia [12] used CFD modeling to investigate the thermal performance of new designs of wind catchers with wetted columns. The numerical results showed that the wetted columns with the height of 10 meters were able to reduce the air temperature by 12 K.…”

Section: Previous Related Workmentioning

confidence: 99%

Performance Investigation of a Commercial Wind Catcher with Horizontally-arranged Heat Transfer Devices (HHTD)

Calautit¹,

Hughes²,

O’Connor³

et al. 2015

3rd Annual International Conference on Architecture and Civil Engineering (ACE 2015)

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Two-phase Euler-Lagrange CFD simulation of evaporative cooling in a Wind Tower

Cited by 56 publications

References 7 publications

The impact of ventilation cooling towers on plus energy houses in southern Europe

The impact of ventilation cooling towers on plus energy houses in southern Europe

Climatic analysis of a passive cooling technology for the built environment in hot countries

Performance Investigation of a Commercial Wind Catcher with Horizontally-arranged Heat Transfer Devices (HHTD)

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