scholarly journals Noise reduction of a double-skin façade considering opening for natural ventilation

2012 ◽  
Vol 131 (4) ◽  
pp. 3320-3320 ◽  
Author(s):  
Jean-Philippe Migneron ◽  
André Potvin
Keyword(s):  
Noise Reduction ◽  
Natural Ventilation ◽  
Double Skin

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

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).

Noise reduction of enhanced acoustic balconies on a high-rise building block

2021 ◽  
Vol 263 (1) ◽  
pp. 5327-5334
Author(s):  
SK Tang ◽  
Rudolf YC Lee
Keyword(s):  
Noise Reduction ◽  
Natural Ventilation ◽  
Traffic Noise ◽  
Elevation Angle ◽  
Noise Levels ◽  
Indoor Space ◽  
New Device ◽  
Air Inlet ◽  
The Difference ◽  
The Impact

A new device called 'enhanced acoustic balcony' is installed in a new housing estate in Hong Kong. It is intended to help reduce the impact of traffic noise on the residents. This balcony is basically an enlarged form of a plenum window and with three openings. Apart from the outdoor air inlet, there is the balcony door and a side-hung window on the interior balcony wall for natural ventilation of the indoor space. Sound absorption of NRC 0.7 is installed on the balcony ceiling and its sidewall facing the incoming traffic noise and an inclined panel is installed outside the balcony to provide noise screening. A site measurement of its noise reduction is carried out in the present study in a newly completed housing block. A 28 m long loudspeaker array is used as the sound source. The indoor noise levels are measured according to ISO standard. The results show that the difference between indoor and outdoor noise levels in the presence of this balcony form varies over a relatively narrow range between 10 to 13 dBA for an elevation angle from 25 to 60 deg. There is a weak increase of the noise level difference with elevation angle.

Effects of double skin envelopes on natural ventilation and heating loads in office buildings

2011 ◽  
Vol 43 (9) ◽  
pp. 2118-2126 ◽  
Author(s):  
Yu-Min Kim ◽  
Ji-Hyun Lee ◽  
Sang-Min Kim ◽  
Sooyoung Kim
Keyword(s):  
Natural Ventilation ◽  
Office Buildings ◽  
Double Skin ◽  
Heating Loads

scholarly journals Wind tunnel study of natural ventilation of building integrated photovoltaics double skin façade

2018 ◽  
Vol 32 ◽  
pp. 01020 ◽  
Author(s):  
Sebastian Valeriu Hudişteanu ◽  
Cătălin George Popovici ◽  
Nelu-Cristian Cherecheş
Keyword(s):  
Wind Tunnel ◽  
Natural Ventilation ◽  
Cooling Effect ◽  
Experimental Program ◽  
Small Scale ◽  
Photovoltaic Panels ◽  
Building Integrated Photovoltaics ◽  
Building Model ◽  
Double Skin ◽  
Wind Influence

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.

Soundproof Window - Natural Ventilation

2021 ◽  
Vol 263 (3) ◽  
pp. 3294-3304
Author(s):  
Vinícius Ávila Ferreira
Keyword(s):  
Noise Reduction ◽  
Air Conditioning ◽  
Natural Ventilation ◽  
Noise Pollution ◽  
Air Conditioning System ◽  
Domestic Environment ◽  
Frequent Use ◽  
Air Supply ◽  
Acoustic Comfort ◽  
Surrounding Areas

Expansion of brasilians cities worsen noise pollution in these places, forcing people to maintain their doors and windows closed. Domestic environment enclosing lead to necessity of air conditioning system, however the frequent use of the equipment may cause many health problems, such as respiratory difficulties and spread of diseases , not to mention high costs with energy. Considering these facts, there is the need of soundproofing windows with air supply , that allows passage of air without noise passage, guarantee a well-ventilated environment, with thermic and acoustic comfort without the use of acclimatisation systems . we have developed two prototypes with significant opening that allows air supply (passage) (0,35m2) and noise reduction (Rw+Ctr) reaching 8 to 10 dB. In the first study, we considered people inhabiting really noisy surrounding areas, who has already installed a regular window. In this particular case, we developed a soundproofing window air supply that can be installed over the existing one. A second study considered new constructions to focus the environment where the person sleeps and then elaborate a soundproofing window air supply for bedrooms.

Double Skin Facades with Natural Ventilation Capability: A Case Study of Acoustical Enhancement via Passive and Active (Noise Cancelling) Methods

2016 ◽  
Vol 861 ◽  
pp. 537-544 ◽  
Author(s):  
Christian Tauber ◽  
Egzon Bajraktari ◽  
Josef Lechleitner ◽  
Ulrich Pont ◽  
Ardeshir Mahdavi
Keyword(s):  
Natural Ventilation ◽  
Low Cost ◽  
Noise Cancellation ◽  
Destructive Interference ◽  
Active Noise ◽  
Noise Cancelling ◽  
Double Skin ◽  
Double Skin Facades ◽  
Cost Components

Within an ongoing project, we explore the potential of double skin facades to provide both noise control and natural ventilation capability. Three strategies are investigated: i) Manipulation of sound paths via offset of the openings in the two shells of the façade; ii) Application of absorbing materials in the interstitial space of the façade; iii) Active noise cancelling methods utilizing wave-destructive interference. This contribution describes the overall project but focuses primarily on the active noise cancellation approach. Aside from a comprehensive background research on existing technology, we undertook the design of an actual setting for noise cancellation testing with suitable low-cost components as a proof-of-concept. Results of the experiments are expected to inform subsequent efforts to include noise-cancelling technology in double skin facades.

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