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IEC 61400-11:2012+AMD1:2018 CSV Acoustic noise measurement techniques (Consolidated Version) IEC TS 61400-11-2:2024 Acoustic noise measurement techniques - Measurement of wind turbine sound characteristics in receptor position; IEC 61400-12:2022 Power performance measurements of electricity producing wind turbines - Overview
A roof turbine ventilator, colloquially known as a 'Whirly Bird' is an application of wind driven ventilation. Passive ventilation is the process of supplying air to and removing air from an indoor space without using mechanical systems.
Vestas engineers checked and repaired the wind turbine brake on the morning of 22 February 2008. At the last routine inspection it was noted that the main gear of the turbine was also making unusual noises and a sophisticated endoscopic inspection of the gear was planned, but as result of its high cost it was not undertaken immediately.
An attic fan installed underneath a roof. A powered attic ventilator, or attic fan, is a ventilation fan that regulates the heat level of a building's attic by exhausting hot air. A thermostat is used to automatically turn the fan off and on, while sometimes a manual switch is used. An attic fan can be gable mounted or roof mounted. Additional ...
The new turbine has better electrical and hydrodynamic characteristics and a 40-year working life. [53] On 6 July 2011, a ship loaded with new parts for the turbines left Saint Petersburg. [54] On 8 July 2011, turbines 3, 4 and 5 were working under full load and turbine 6 was in reserve. [55]
These regulations also set a minimum distance of 550 metres (1,800 ft) for a group of up to five relatively quiet [102 dB(A)] turbines within a 3-kilometre (1.9 mi) radius, rising to 1,500 metres (4,900 ft) for a group of 11 to 25 noisier (106–107 dB(A)) turbines. Larger facilities and noisier turbines would require a noise study. [19] [21]
Noise, static or snow screen captured from a blank VHS tape. Noise, commonly known as static, white noise, static noise, or snow, in analog video, CRTs and television, is a random dot pixel pattern of static displayed when no transmission signal is obtained by the antenna receiver of television sets and other display devices.
Wind turbines also generate noise. At a distance of 300 metres (980 ft) this may be around 45 dB, which is slightly louder than a refrigerator. At 1.5 km (1 mi) distance they become inaudible. [27] [28] There are anecdotal reports of negative health effects on people who live very close to wind turbines. [29]