CFD investigation of airflow pattern, temperature distribution and thermal comfort of UFAD system for theater buildings applications

Nada, S.A.; El-Batsh, Hesham M.; Elattar, H.F.; Ali, Nor Merlisa

doi:10.1016/j.jobe.2016.04.008

Cited by 62 publications

(30 citation statements)

References 16 publications

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“…During the simulation, a turbulent model k-ε was used: a model of two equations in which the turbulent viscosity depends on kinetic energy "k" and turbulent dispersion "ε" [21]. Additionally, the program has already been used to study strictly air terminal devices [22,23], and the impact of ventilation and air-conditioning systems on air quality and thermal comfort for many years [24,25].…”

Section: Cfd Simulation Set-upmentioning

confidence: 99%

PIV measurement and CFD simulations of an air terminal device with a dynamically adapting geometry

2019

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Air quality is an important factor for human well-being, and it is crucial that when using mechanical ventilation system, air is properly distributed so it reaches every user of a ventilated zone. To improve ventilation systems, and in consequence the air quality, this paper focuses on studying the impact of an air terminal device (ATD) with a dynamically changing geometry on the effectiveness of a variable air volume (VAV) ventilation system. VAV system characterizes a change in the airflow magnitude through the system when the heat gains lower, which may be a risk for human health as air may not reach the furthest parts of a zone. To combat this threat, an ATD with a dynamically changing geometry was installed. As a ventilation quality indicator, the air throw was taken under consideration. Thanks to the new ATD, the steady air throw should be maintained despite the changes in flow in the ventilation system. To achieve this, the research was divided into two stages. The first stage included a series of computational fluid dynamics simulations that considered the alteration of the airflow and the air terminal device diameter. Afterwards, verifying laboratory measurements were conducted on a laboratory stand using a particle image velocimetry (PIV) system that included an air terminal device with a changing geometry. The results of the simulations and the PIV measurements showed that the changes in the geometry of the air terminal device improve the ventilation effectiveness of a VAV system, allowing the system to maintain a constant air throw despite the changing airflow magnitude through the system.

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Section: Cfd Simulation Set-upmentioning

confidence: 99%

PIV measurement and CFD simulations of an air terminal device with a dynamically adapting geometry

2019

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“…Additionally, CFD simulations are a powerful tool for estimating the airflow patterns and thermal environment of various HVAC (heating, ventilation, and air conditioning) systems. They were used for the estimation and control of indoor environment and space ventilation when using a VAV system by Sun and Wang [39], Du et al [40], Gangisetti et al [41], and Nada et al [42], among others. Furthermore, they were used to analyze the influence of structures on airflow, for example, by Mu et al [43].…”

Section: Introductionmentioning

confidence: 99%

An Air Terminal Device with a Changing Geometry to Improve Indoor Air Quality for VAV Ventilation Systems

Szczepanik-Ścisło

Schnotale

2020

Energies

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This study aimed to develop a new concept for an air terminal device for a VAV (variable air volume) ventilation system that would improve overall ventilation efficiency under a varying air supply volume. In VAV systems, air volume is modified according to the thermal load in each ventilated zone. However, lowering the airflow may cause a lack of proper air distribution and lead to the degradation of hygienic conditions. To combat this phenomenon, an air terminal device with an adapting geometry to stabilize the air throw, such that it remains constant despite the changing air volume supplied through the ventilation system, was designed and studied. Simulations that were performed using the RNG k–ε model in the ANSYS Fluent application were later validated on a laboratory stand. The results of the study show that, when using the newly proposed terminal device with an adaptive geometry, it is possible to stabilize the air throw. The thermal comfort parameters such as the PMV (predicted mean vote) and PPD (predicted percentage of dissatisfied) proved that thermal comfort was maintained in a person-occupied area regardless of changing airflow though the ventilation system.

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“…Nada et al investigated thermal comfort, temperature distribution, and air flow pattern using CFD in a theater building, which yielded optimal performance temperature, proper temperature, and velocity of inlet air [14].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Energy Consumption in Net-Zero Energy Buildings with Increasing Thermal Comfort of Occupants

Adeli

Farahat

Sarhaddi

2020

International Journal of Photoenergy

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Residential and commercial buildings consume approximately 60% of the world’s electricity. It is almost impossible to provide a general definition of thermal comfort, because the feeling of thermal comfort is affected by varying preferences and specific traits of the population living in different climate zones. Considering that no studies have been conducted on thermal satisfaction of net-zero energy buildings prior to this date, one of the objectives of the present study is to draw a comparison between the thermal parameters for evaluation of thermal comfort of a net-zero energy building occupants. In so doing, the given building for this study is first optimized for the target parameters of thermal comfort and energy consumption, and, hence, a net-zero energy building is formed. Subsequent to obtaining the acceptable thermal comfort range, the computational analyses required to determine the temperature for thermal comfort are carried out using the Computational Fluid Dynamics (CFD) model. The findings of this study demonstrate that to reach net-zero energy buildings, solar energy alone is not able to supply the energy consumption of buildings and other types of energy should also be used. Furthermore, it is observed that optimum thermal comfort is achieved in moderate seasons.

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CFD investigation of airflow pattern, temperature distribution and thermal comfort of UFAD system for theater buildings applications

Cited by 62 publications

References 16 publications

PIV measurement and CFD simulations of an air terminal device with a dynamically adapting geometry

PIV measurement and CFD simulations of an air terminal device with a dynamically adapting geometry

An Air Terminal Device with a Changing Geometry to Improve Indoor Air Quality for VAV Ventilation Systems

Optimization of Energy Consumption in Net-Zero Energy Buildings with Increasing Thermal Comfort of Occupants

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