Tham khảo tài liệu 'wind power 2011 part 20', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Wind-Solar Driven Natural Electric Hybrid Ventilators 551 Ventilator comparison wind speed vs. flow rate various cell voltages Graph 7. Ventilator comparison wind speed vs. volume flow rate Graph 6 shows the relationship between wind speed and volumetric flow rate for a variety of cell voltages. As with Graph 5 the advantage of the Wind-Solar Hybrid ventilator was lost regardless of the cell voltage at wind speeds above 10 m s. The advantage of higher cell voltages was most apparent at zero and low wind speeds which was the most important consideration for the project. Both graphs indicated the performance benefit of the design at zero and low wind speed when a reasonable amount of sunlight was present. Graph 7 reveals the performance of the ventilators under different wind and sun conditions. The first point of interest was the vastly superior performance of the hybrid device compared to the solar ventilator. The performance curve for the solar ventilator was taken under full cell voltage conditions. When compared to the hybrid ventilator under the same power level the hybrid ventilator had much better volume flow rate. Even under zero wind conditions the hybrid ventilator had a higher flow rate than the solar ventilator subjected to 10 m s wind speed. This advantage was enjoyed even when the hybrid ventilator was subjected to less than full power. When compared at 10 m s wind speed the hybrid ventilator had a flow rate more than 5 times greater than the solar ventilator. The performance curves starkly illustrated the higher efficiency of the hybrid ventilator compared to the standard solar ventilator. Such a performance advantage added to the weight behind the feasibility of the hybrid device. The Wind-Solar Hybrid device also compared well with the turbine ventilator. Graphs 7 and 8 showed that the performance advantage of the Solar-Wind Hybrid ventilator under full power was not lost to the turbine ventilator until the wind speed was above m s Graph 7 . .
