Commercially available wind-turbines are optimized to operate at certain wind velocity, known as rated wind velocity. For other values of wind velocity, it has different output which is lower than the rated output of ...Commercially available wind-turbines are optimized to operate at certain wind velocity, known as rated wind velocity. For other values of wind velocity, it has different output which is lower than the rated output of the wind plant. Wind mill can be designed to provide maximum power output at different wind velocities through modification of swept area to match with the wind speed available at the moment. This can result in higher power output at all the velocities except that at rated wind speed because of limitation of generator. This results in increased utilization of generation capacity of wind mill compared to its commercially designed counterpart. A theoretical simulation has been done to prove a new concept about swept area of wind turbine blade which results in a significant increase in the power output through the year. Simulation results of power extracted through normal wind blade design and new concept are studied and compared. The findings of the study are presented in graphical and tabular form. Study establishes that there can be a significant gain in the power output with the new concept.展开更多
灌溉农业是世界上常见的生产活动之一,但失衡的农业生产会造成周边湿地退化和生态系统服务功能降低。本文通过建立农田生产和湿地保护综合模型,模拟内蒙古河套灌区农田-乌梁素海湿地生态系统价值的变化规律,以寻求实现农业和湿地生态系...灌溉农业是世界上常见的生产活动之一,但失衡的农业生产会造成周边湿地退化和生态系统服务功能降低。本文通过建立农田生产和湿地保护综合模型,模拟内蒙古河套灌区农田-乌梁素海湿地生态系统价值的变化规律,以寻求实现农业和湿地生态系统价值最大化的措施。以2002年的数据作为基准,控制其他因素不变的情况下,模型分析得到当施肥量为252.3 kg N/hm2时,系统的总价值量达到最大,为24.40×108元。此外,湿地子系统价值和河套灌区的引水量成正比,和农田灌溉配额成反比。将农田灌溉配额减少60%,系统总价值将增加70%。因此,在目前灌区可供水量有限的情况下,控制农田施肥量和降低灌溉配额是保持河套灌区农业生产和乌梁素海服务价值最优化的有效措施。展开更多
文摘Commercially available wind-turbines are optimized to operate at certain wind velocity, known as rated wind velocity. For other values of wind velocity, it has different output which is lower than the rated output of the wind plant. Wind mill can be designed to provide maximum power output at different wind velocities through modification of swept area to match with the wind speed available at the moment. This can result in higher power output at all the velocities except that at rated wind speed because of limitation of generator. This results in increased utilization of generation capacity of wind mill compared to its commercially designed counterpart. A theoretical simulation has been done to prove a new concept about swept area of wind turbine blade which results in a significant increase in the power output through the year. Simulation results of power extracted through normal wind blade design and new concept are studied and compared. The findings of the study are presented in graphical and tabular form. Study establishes that there can be a significant gain in the power output with the new concept.
文摘灌溉农业是世界上常见的生产活动之一,但失衡的农业生产会造成周边湿地退化和生态系统服务功能降低。本文通过建立农田生产和湿地保护综合模型,模拟内蒙古河套灌区农田-乌梁素海湿地生态系统价值的变化规律,以寻求实现农业和湿地生态系统价值最大化的措施。以2002年的数据作为基准,控制其他因素不变的情况下,模型分析得到当施肥量为252.3 kg N/hm2时,系统的总价值量达到最大,为24.40×108元。此外,湿地子系统价值和河套灌区的引水量成正比,和农田灌溉配额成反比。将农田灌溉配额减少60%,系统总价值将增加70%。因此,在目前灌区可供水量有限的情况下,控制农田施肥量和降低灌溉配额是保持河套灌区农业生产和乌梁素海服务价值最优化的有效措施。
