A CFD-Based Parametric Thermal Performance Analysis of Supply Air Ventilated Windows

Khosravi, Shiva Najaf; Mahdavi, Ardeshir

doi:10.3390/en14092420

Cited by 18 publications

(11 citation statements)

References 53 publications

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“…Compared to the centralized ventilation systems, the higher efficiency and the significantly compacter design of decentralized ventilation systems due to the less pressure loss through the short tubing, make them a proper choice for renovation and reconstruction projects in buildings. Among various solutions using the window cavity [5] [6], the use of window frames to house a decentralized ventilation system has been recently shown as a promising idea to provide fresh air into indoor space. The compact integration of a decentralized ventilation system in a space-limited window cavity offers a convenient installation and prevents additional brickwork.…”

Section: Introductionmentioning

confidence: 99%

Optimization of a ventilation system integrated into a window frame using CFD simulations

Karolin,

Rahiminejad

2023

J. Phys.: Conf. Ser.

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A decentralized ventilation system has the potential to decrease the pressure drop in a ventilation system and consequently, increase the efficiency of the system and building skin. Including a decentralized ventilation system in a window cavity allows independent regulation of the fresh air quality in each room and can be easily installed without any additional brickwork. In this study, a novel ventilation system integrated into a window-frame is examined and the most critical region regarding pressure drop is identified using computational fluid dynamic (CFD) simulations. The entire fresh air channel including the optimized section is compared with the original volume regarding system resistance and satisfaction of the required airflow according to Swiss standards. The results suggest a relocation of the restricting control unit and an increased cross-section to decrease the air velocity and the pressure drop. The simulations predicted that the required airflow for sufficient indoor air quality is exceeded using the optimized geometry.

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Section: Introductionmentioning

confidence: 99%

Optimization of a ventilation system integrated into a window frame using CFD simulations

Karolin,

Rahiminejad

2023

J. Phys.: Conf. Ser.

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“…Khosravi et al [24] conducted a study on a ventilated window in winter mode. The aim herein was to analyze the preheated fresh air passing through the window along with its performance.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Thermo-Aeraulic Behavior of a Heated Supply Air Window in Forced Convection: Numerical and Experimental Approaches

2023

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This paper presents work intended to characterize air flow and convective heat transfers within a ventilated window. This window is a device that allows for the entry of fresh air into a building while simultaneously preheating it in order to satisfy requirements in terms of air quality and thermal comfort in inhabited spaces. Therefore, this essential component of the building envelope functions herein as a heat exchanger with its own geometric characteristics and exchange conditions. In this research, a dual numerical and experimental approach has been implemented in order to highlight the temperatures, velocities and heat flux fields both at the glazing surfaces and in the ventilated air gaps. Several turbulence models were tested using CFD software (ANSYS-FLUENT®); their results were compared with each other as well as with the experimental results. This study shows that the air gap geometry in the window induces flow disturbances, recirculation phenomena and non-uniform heat exchanges, all of which prove to be important in terms of overall component performance. With regard to modeling and, in particular, at the level of turbulence models, the results obtained indicate that the model GEKO is best suited to the configuration under study when the phenomena of turbulent forced convection dominate the dynamics of the transfers. The k-ε models reveal a tremendous weakness in precisely estimating the problem’s characteristic quantities. From an experimental point of view, local measurements of thermal fluxes and temperatures demonstrate high efficiency with regard to experimental technique, which in turn could be extended to many different configurations for the local evaluation of convection heat transfer.

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“…Supply-air windows are a variation of multiple-pane windows in which air is drawn in from the outside and heated within the cavity by convection, conduction, and radiation [11]. Carlos et al [4] studied experimentally the thermal performance of a naturally ventilated double window with one airflow layer during the heating season.…”

Section: Introductionmentioning

confidence: 99%

New Supply-Air Solar Wall with Thermal Storage Designed to Preheat Fresh Air: Development of a Numerical Model Adapted to Building Energy Simulation

et al. 2022

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Façades built with integrated passive solar systems hold great promise for improving the energy performance of buildings and achieving indoor comfort conditions. Among these techniques, solar air preheating systems with different configurations have proven their ability to reduce the energy consumption of buildings during the heating season. In this study, we propose a ventilated solar wall (VSW) with a thermal storage unit intended for preheating ventilation air. The final aim of this study is to determine the thermal performance of the studied VSW over a significant time period (during the heating season) under various climatic conditions when it is integrated into the building envelope. Therefore, for this purpose, a simplified model was developed to be coupled to a building energy simulation (BES) code. The results from the detailed steady-state 2D computational fluid dynamics (CFD) model show that the thermal efficiency of the VSW ranged from 55% to 70% as the air mass flow rate increased from 0.008 kg/s to 0.02 kg/s for a surface of 2.15 m2. These results were used to evaluate the convective heat transfer coefficients in the two air cavities and to validate the simplified model. The results indicate good agreement between the two models.

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A CFD-Based Parametric Thermal Performance Analysis of Supply Air Ventilated Windows

Cited by 18 publications

References 53 publications

Optimization of a ventilation system integrated into a window frame using CFD simulations

Optimization of a ventilation system integrated into a window frame using CFD simulations

Analysis of the Thermo-Aeraulic Behavior of a Heated Supply Air Window in Forced Convection: Numerical and Experimental Approaches

New Supply-Air Solar Wall with Thermal Storage Designed to Preheat Fresh Air: Development of a Numerical Model Adapted to Building Energy Simulation

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