Tham khảo tài liệu 'insight into ielts part 4', ngoại ngữ, toefl - ielts - toeic phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Reading UNIT 4 D The wind farm is connected to the power station by a 3 3-kilovolt powerline and a radio link between the two allows operators to monitor and control each wind turbine. The nine 225-kilowatt Vestas wind turbines produce a total generating capacity of two megawatts and provide around 12 per cent of the energy requirements of Esperance and its surrounding districts. E The power produced by a wind turbine depends on the size and efficiency of the machine and of course on the energy in the wind. The energy in the wind available to the wind turbines is proportional to wind speed cubed. Thus the greater the wind speed the greater the output of the turbine. In order to achieve optimum wind speeds the right location is imperative. You have to accept the nature of the beast Mr Rosser Western Power s physicist said. As surface dwellers our perceptions of wind speeds are bad. As you go higher wind speed increases significantly. F The most favourable wind sites are on gently sloping hills away from obstructions like trees and buildings J and where the prevailing winds are not blocked. Computer modelling was used to select the best site for Esperance s wind farm. Scientists were concerned not only with efficiency but also with protecting the coastal health environment which is rich in plant life and home to tiny pygmy and honeypossums and a host of bird species. In addition the wind farm is adjacent to Esperance s popular scenic tourist drive. G Strict erosion controls have been implemented and access to the wind farm is limited to selected viewing areas. The wind turbine towers are painted white and devoid of corporate logos or signage. According to Mr Rosser there is something of a worldwide backlash against wind farms with regard to their visual impact But because wind turbines perform best in the most exposed positions they will always be visible. There is a very real need to balance environmental and technical requirements. I think the Ten Mile Lagoon Wind
