Analysis of airflow inside a two-sided wind catcher building

Zaki, Ahmad; Richards, P.J.; Sharma, Rajnish N.

doi:10.1016/j.jweia.2019.04.007

Cited by 36 publications

(20 citation statements)

References 51 publications

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“…Studies found a significant effect of a curved configuration of the capturing unit (Figure 2) in increasing the airflow velocity, which leads to a good natural ventilation with minimum energy consumption (Pearlmutter, Erell, Etzion, Meir, & Di, 1996). Modern designs of wind towers are characterized by their great heights and control systems to reduce dust accumulation, reach levels of high air velocity, and maximize the amount of storage for cooling (Zaki et al, 2019). In order to improve their thermal efficiency, wind towers were equipped with evaporative cooling systems.…”

Section: Evaluation Of Wind Towers Efficiencymentioning

confidence: 99%

CFD Analysis of an Innovative Wind Tower Design with Wind-Inducing Natural Ventilation Technique for Arid Climatic Conditions

Obeidat¹,

Kamal²,

Almalkawi³

2021

J. Ecol. Eng.

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Section: Evaluation Of Wind Towers Efficiencymentioning

confidence: 99%

CFD Analysis of an Innovative Wind Tower Design with Wind-Inducing Natural Ventilation Technique for Arid Climatic Conditions

Obeidat¹,

Kamal²,

Almalkawi³

2021

J. Ecol. Eng.

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“…The position of wind‐catcher against the building must be chosen carefully to maximize natural ventilation efficiency. Zaki et al 25 investigated the relation between the wind‐catcher position against the structure. They concluded that the position of wind‐catcher is crucial in the matter of natural ventilation performance.…”

Section: Related Studiesmentioning

confidence: 99%

New passive thermal comfort system using three renewable energies: Wind catcher, solar chimney and earth to air heat exchanger integrated to real‐scale test room in arid region (Experimental study)

et al. 2020

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Summary Thermal comfort is one of the ancient‐new challenges of the arid region population and responsible for more than 40% of energy end‐use. Renewable energy can be a solution to this problem. In the present paper, the potential of renewable energies to ameliorate thermal comfort and reducing energy consumption in building sectors is experimentally investigated. Three renewable‐based applications are used: wind‐catcher (WC), solar chimney (SC), and earth to air heat exchanger (EAHE). The three techniques are connected to a real‐scale test room and investigated using in‐situ measurement. The contribution of each technique is discussed separately. Temperature, humidity sensors, and anemometer are used to study parameters affecting thermal comfort. Obtained results show that the use of wind‐catcher could provide in the presence of wind an internal airflow of 3.8 m.s−1 which reduces inside room temperature by 6°C. A solar chimney creates a difference between its inlet and outlet air temperature by 5.9°C and increases the kinetic energy of hot air leaving the solar chimney which is replaced by cool air from outside and other devices outlet (EAHE and WC) and increases internal airflow even with the absence of winds. The earth to air heat exchanger increases the outlet air temperature in winter by 8°C and reduces it by 12°C in summer. Inside test room hygrometry is also ameliorated by the use of EAHE. Analyzing the new system (test room + WC + SC + EAHE) shows an important amelioration of inside thermal comfort. A difference between inside and outside test room temperature is found: reduction of 13°C in summer, and a gain of 10°C in winter. The new system leads to better inside test room thermal comfort conditions and to reduce energy consumption by almost 50%. The present study presents the first experimental investigation of using three renewable energies in the same building to improve thermal comfort. Using real scale room and in‐situ measurement gives a realistic idea and results show that green energy could improve the thermal situation and energy saving. This is an original work to motivate building designers, especially in the arid region to use more than one renewable energy to ameliorate thermal comfort in both summer and winter seasons.

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“…Most of the previous studies have been performed for 3D steady RANS for traditional two-sided windcatcher models [4]. Recently, the analysis of the internal flow characteristics of the traditional two-sided windcatcher model has been performed for a better understanding of the external flow condition effects on ventilation performance [5]. e numerical simulation has been carried out using the standard k-ε turbulence model.…”

Section: Introductionmentioning

confidence: 99%

“…However, an estimation of the performance of the proposed model is required. It should be pointed out that the commercial ANSYS software has been applied previously in many important papers that investigated the performance of windcatcher in different flow regimes [5,[8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Towards a Computational Fluid Dynamics-Based Fuzzy Logic Controller of the Optimum Windcatcher Internal Design for Efficient Natural Ventilation in Buildings

Balabel

Faizan

Alzaed

2021

Mathematical Problems in Engineering

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Recently, increased attention has been given to the coupling of computational fluid dynamics (CFD) with the fuzzy logic control system for obtaining the optimum prediction of many complex engineering problems. The data provided to the fuzzy system can be obtained from the accurate computational fluid dynamics of such engineering problems. Windcatcher performance to achieve thermal comfort conditions in buildings, especially in hot climate regions, is considered as one such complex problem. Windcatchers can be used as natural ventilation and passive cooling systems in arid and windy regions in Saudi Arabia. Such systems can be considered as the optimum solution for energy-saving and obtaining thermal comfort in residential buildings in such regions. In the present paper, three-dimensional numerical simulations for a newly-developed windcatcher model have been performed using ANSYS FLUENT-14 software. The adopted numerical algorithm is first validated against previous experimental measurements for pressure coefficient distribution. Different turbulence models have been firstly applied in the numerical simulations, namely, standard k-epsilon model (1st and 2nd order), standard Wilcox k-omega model (1st and 2nd order), and SST k-omega model. In order to assess the accuracy of each turbulence model in obtaining the performance of the proposed model of the windcatcher system, it is found that the second order k-epsilon turbulence model gave the best results when compared with the previous experimental measurements. A new windcatcher internal design is proposed to enhance the ventilation performance. The fluid dynamics characteristics of the proposed model are presented, and the ventilation performance of the present model is estimated. The numerical velocity profiles showed good agreement with the experimental measurements for the turbulence model. The obtained results have shown that the second order k-epsilon turbulence can predict the different important parameters of the windcatcher model. Moreover, the coupling algorithm of CFD and the fuzzy system for obtaining the optimum operating parameters of the windcatcher design are described.

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Analysis of airflow inside a two-sided wind catcher building

Cited by 36 publications

References 51 publications

CFD Analysis of an Innovative Wind Tower Design with Wind-Inducing Natural Ventilation Technique for Arid Climatic Conditions

CFD Analysis of an Innovative Wind Tower Design with Wind-Inducing Natural Ventilation Technique for Arid Climatic Conditions

New passive thermal comfort system using three renewable energies: Wind catcher, solar chimney and earth to air heat exchanger integrated to real‐scale test room in arid region (Experimental study)

Towards a Computational Fluid Dynamics-Based Fuzzy Logic Controller of the Optimum Windcatcher Internal Design for Efficient Natural Ventilation in Buildings

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