WIND TUNNEL INVESTIGATION OF NATURAL VENTILATION INSIDE DOUBLE SKIN FA�ADES

The paper presents a wind tunnel experimental analysis of a small-scale building model (1:30). The objective of the study is to determine the wind influence on the ventilation of a double skin façade channel (DSF) and the cooling effect over integrated photovoltaic panels. The tests were achieved by conceiving and implementation of an experimental program using a wind tunnel with atmospheric boundary layer. The effect of the wind over the ventilation of the horizontal channels of double skin façades is evaluated for different incident velocities. The results are generalized for the average steady state values of the velocities analysed. The experimental results put in evidence the correlation between the reference wind velocity and the dynamics of the air movement inside the double skin façade. These values are used to determine the convective heat transfer and the cooling effect of the air streams inside the channel upon the integrated photovoltaic panels. The decrease of the photovoltaic panels temperature determines a raise of 11% in efficiency and power generated.

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05/02299 Natural ventilation performance of a double-skin façade with a solar chimney

Fuel and Energy Abstracts ◽

10.1016/s0140-6701(05)82308-2 ◽

2005 ◽

Vol 46 (5) ◽

pp. 335

Keyword(s):

Natural Ventilation ◽

Solar Chimney ◽

Double Skin ◽

Ventilation Performance

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Application of compact silencers as a noise barrier to a naturally ventilated double-skin façade

Noise Control Engineering Journal ◽

10.3397/1/376922 ◽

2021 ◽

Vol 69 (3) ◽

pp. 220-228

Author(s):

Jeehwan Lee ◽

Jae D. Chang ◽

Robert Coffeen

Keyword(s):

Noise Reduction ◽

Surface Area ◽

Natural Ventilation ◽

Experimental Investigations ◽

Test Case ◽

Open Surface ◽

Low Frequencies ◽

Noise Barrier ◽

Double Skin ◽

Air Vent

A prior study of the acoustical performance of a double-skin facade (DSF) as a noise barrier was carried out based on the percentage of the air vent open surface area, shading louver configurations, and shading louver surface materials. Earlier research findings led to experimental investigations of the acoustical performance capabilities of compact silencers to replace DSF air vents as both noise barriers and air channels because DSF air cavities, which contribute to natural ventilation performance (e.g., wind-driven or buoyancy-driven performance), are acoustically vulnerable to noise transmitted through the air vents. This experimental investigation aims to explore noise reduction (NR) through compact silencers applied to DSF air vents. Double-skin facade mock-up test cases were designed based on three test scenarios of a ventilation open surface area: (1) a 100%air vent open surface area (open mode), (2) a 0% air vent open surface area (closed mode), and (3) a compact silencer. From a data analysis of DSF mock-up test results, the overall NR values of a DSFmock-up ranged from20 to 37 dB(A) depending on the number of compact silencers and the shading louver orientation used. Configurations of compact silencers and shading louvers helped the DSF mock-up achieve additionalNR values of 5 to 10 dB(A) depending on the test case. Moreover, applying compact silencers to a naturally ventilated DSF mock-up led to significant noise reduction at low frequencies (125Hz).

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Wind and buoyancy driven natural ventilation in double skin façades

International Journal of Ventilation ◽

10.1080/14733315.2016.1214391 ◽

2016 ◽

pp. 1-14

Author(s):

Alessandro Dama ◽

Diego Angeli

Keyword(s):

Natural Ventilation ◽

Double Skin ◽

Double Skin Facades

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Wind-tunnel analysis of natural ventilation in a generic building in sheltered and unsheltered conditions: Impact of Reynolds number and wind direction

Journal of Wind Engineering and Industrial Aerodynamics ◽

10.1016/j.jweia.2020.104388 ◽

2020 ◽

Vol 207 ◽

pp. 104388

Author(s):

Dino Golubić ◽

Walter Meile ◽

Günter Brenn ◽

Hrvoje Kozmar

Keyword(s):

Reynolds Number ◽

Wind Tunnel ◽

Wind Direction ◽

Natural Ventilation ◽

Tunnel Analysis

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Experimental investigation of the wind direction influence on the cooling of photovoltaic panels integrated in double skin façades

E3S Web of Conferences ◽

10.1051/e3sconf/201911103045 ◽

2019 ◽

Vol 111 ◽

pp. 03045

Author(s):

Sebastian Valeriu Hudișteanu ◽

Cătalin George Popovici

Keyword(s):

Experimental Investigation ◽

Wind Tunnel ◽

Wind Direction ◽

Warm Season ◽

Experimental Program ◽

Small Scale ◽

Transfer Coefficients ◽

Photovoltaic Panels ◽

Reference Velocity ◽

Double Skin

The paper presents a wind tunnel experimental investigation of a small-scale building model (1:30). The main objective of the study is to determine the influence of the reference wind direction over the ventilation inside the double skin façade (DSF) channel. The analyzed system consists of a building equipped with photovoltaic panels as the exterior glazing of DSF. The tests were achieved by conceiving and implementation of an experimental program using a wind tunnel with atmospheric boundary layer. The aim is to determine with acceptable probability the velocities that can be reached in the ventilated façade channel during the warm season and to establish a correlation between the external reference velocity magnitude and direction and the velocity field generated inside the channel of the façade. Measurements were carried out for the reference wind speed, total, dynamic and static pressure both in the reference point and inside the façade channel. The results of the investigation highlighted the correlation between the velocity and direction of the reference wind and the dynamics of the air movement inside the double skin façade. The measurements showed that for the analyzed configuration of the double skin façade, there is an optimal wind direction that ensures the best cooling effect to photovoltaic panels. Also, the convective heat transfer coefficients were determined under these conditions. The decrease of the photovoltaic panel’s temperature determines a raise of its efficiency and generated power.

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Wind Tunnel Study on the Pressure Coefficient Performance of Different Venturi Shaped Roof Configurations for Wind Induced Natural Ventilation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.564.287 ◽

2014 ◽

Vol 564 ◽

pp. 287-291

Author(s):

M.M. Boroojerdian ◽

Nor Maria Adam ◽

Azmin Shakrine Mohd Rafie

Keyword(s):

Wind Tunnel ◽

Negative Pressure ◽

Natural Ventilation ◽

Pressure Coefficient ◽

Ventilation Rate ◽

Wind Tunnel Study

Wind catchers are structures used for natural ventilation using wind induced into buildings. Recently this has attracted attention for green buolding features There is limited studies on the different venturi shapes and their effects on inducing wind into buildingss.. This study considered three configurations ie. the shallow ellipse, the ellipse and the hemisphere in a wind tunnel with different speeds ranging from 8 m/s to 20 m/s. The negative pressure coefficient at the lower center of the roof is considered as the criteria for higher ventilation rate. The shallow ellipse performed the best but due to construction limitations other alternatives are recommended.

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