Comparison between evaporative cooling and a heat pipe assisted thermal loop for a commercial wind tower in hot and dry climatic conditions

Calautit, John Kaiser; Chaudhry, Hassam Nasarullah; Hughes, Ben Richard; Ghаni, Sаud

doi:10.1016/j.apenergy.2012.07.034

Cited by 86 publications

(49 citation statements)

References 15 publications

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“…The heat pipe system is based on the continuous cycle of evaporation and condensation process. When heat is applied to the external surface of the heat pipe, the liquid inside the tube boils and vaporises into a gas that moves through the tube seeking a cooler location where it condenses, giving off its latent heat [16]. This will maintain the operating conditions and repeat the cyclic operation of the heat pipe.…”

Section: Introductionmentioning

confidence: 99%

“…During night-time, the wind tower can also provide cooling by "night-flushing" or removing the stored heat in the building fabric. Recently, several studies [15][16][17] have proposed the addition of heat pipes in windcatchers to enhance its cooling operation and address the issues associated with evaporative cooling method which are detailed in [16]. Figure 2 shows a schematic of the windcatcher with horizontally-arranged heat pipes inside its channel.…”

Section: Introductionmentioning

confidence: 99%

“…The heated air is supplied to the room below the channel via the ceiling diffusers. Dampers located downstream of the windcatcher controls the delivery rate of airflow, as fluctuations in outdoor wind greatly influence the supply airflow velocity and temperature [15][16]. The cooled air is supplied to the room beneath the channel via the ceiling diffusers.…”

Section: Introductionmentioning

confidence: 99%

“…The objective of this work are two-folds: first, to determine the ventilation and cooling potential of the 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 such as Ras-Al-Khaimah (RAK), UAE. In our earlier works [15,16,18], we've assessed the performance of the windcatcher system based on extreme outdoor conditions (i.e. very high outdoor temperature), therefore this study aims to investigate its operation in response to various outdoor conditions.…”

Section: Introductionmentioning

confidence: 99%

“…In [15], the authors compared the ventilation and thermal performance of several types of cooling windcatchers; one-sided and multi-directional using CFD modelling. In [16], the ventilation and thermal performance of evaporative cooling and heat pipe-assisted thermal loop for a wind tower in hot conditions were compared using CFD analysis. In addition, two types of heat pipe fluids (ethanol and water) were also compared using multi-phase CFD modelling.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%