Video | Agriculture | Confidence | Economy | Energy | Employment | Finance | Media | Property | RBNZ | Science | SOEs | Tax | Technology | Telecoms | Tourism | Transport | Search

 

Windflow turbine receives go-ahead

8 October, 2004

Windflow turbine receives go-ahead from District Council

Windflow Technology has received provisional confirmation from the Banks Peninsula District Council that the company’s wind turbine at Gebbies Pass (near Christchurch) is operating within the sound level of its Resource Consent. The turbine will now resume 24-hour operation.

Measurements taken over a two week period recently show that the machine has been below its allowable level. However the majority of measurements were dominated by higher ambient levels.

Late last year, the company suspended the unit’s operation when the sound level exceeded its allowable level by 1 dBA, to which a further 5 dBA was added because of a strong tone coming through from a gearmesh frequency. The wind turbine, with a modified gearbox was reinstalled early in July, and calculations based on the Company’s sound emission readings near the machine showed that it was operating satisfactorily, with no tonal component and measured levels reduced by a remarkable 7 dBA.

“The exciting thing is that we now have one of the world’s quietest wind turbines,” said Windflow Chief Executive Officer Geoff Henderson. “We can now focus on the exciting developments we have been planning for the next few years and talk about some of the unique positive attributes of our design, to which can now be added ‘very quiet gearbox’!”

While calculations based on the ‘near-field’ sound measurements showed compliance, the Company and the Council wanted to measure the actual level in McQueens Valley. A meeting of residents in July asked the Council to approve 24 hour operation for two weeks to allow sound monitoring.

“The problem the Council has had is that on only two days have other sounds been low enough to be anywhere near the predicted sound level in the Valley,” said Mr Henderson.

“The measured sound levels then were below 30 dBA while the windmill was running which shows we are compliant. On other occasions either the windmill wasn’t running or wind speeds were high enough to generate ambient sound levels well above 30 dBA. This is consistent with our predictions that there would be few occasions when ambient levels would be low enough for the turbine sound levels to be measurable.”

Further sound monitoring will take place to obtained refined measurements of the wind turbine’s sound level.

ENDS


© Scoop Media

 
 
 
Business Headlines | Sci-Tech Headlines

 


MPI: Dry Autumn In Waikato And South Auckland Leads To Drought Classification Drought conditions affecting the primary sector in the Waikato and South Auckland were today classified as a medium-scale adverse event, enabling a package of support for farmers and growers... More>>



Commerce Commission: Invites Feedback On Its Initial Views Of Wellington Airport’s Pricing Decisions

The Commerce Commission is inviting feedback on its initial views, released today, about Wellington Airport’s pricing decisions for specified airport services, such as aircraft parking or airfield and passenger terminal charges, for the period 1 April 2019 to 31 March 2024... More>>



Government: Lower Card Fees On Way For Business, Consumers

A Bill to help lower the fees charged when credit and debit transactions are made, will save New Zealand businesses around $74 million a year... More>>



Barfoot & Thompson: Rents Up By Around 3% In Most Areas

The average weekly rent paid for homes in most areas of Auckland has risen by around 3 percent year-on-year. The figures for end March from more than 16,000 properties... More>>


DoC: Smeagol The ‘Gravel Maggot’ Leaves Its Rare Mark On The Remote West Coast
An extremely rare species of sea slug or ‘gravel maggot’ has been detected for the first time on a remote beach in South Westland... More>>



Immigration: Annual Net Migration Loss Of 7,300

The provisional net loss of 7,300 people in the year ended March 2022 was the lowest net migration for a March year since 2012, Stats NZ said today... More>>