暖通空调工程师使用的标准气象数据通常高估了零风速和低风速的发生，因为使用了坚固的旋转杯风速计。因此，这些数据将大大低估风力驱动的自然通风和污染扩散（健康和安全方面的利益）。本文提出的测量方法，采用标准气象旋转杯风速计（由英国气象局使用）与超声波风速计一起，表明由于惯性和摩擦，旋转杯风速计可以在一天中的许多小时内指示零风速，事实上，速度可以达到1.5米/秒（4.9英尺/秒）。 当风速降至3米/秒（9.8英尺/秒）以下时，旋转杯风速计显示出越来越不准确。本文描述了如何使用weibull非线性最小二乘法拟合高速数据，从旋转杯测量中提取更精确的低风数据。图1德蒙福特女王大厦的通风漏斗或烟囱（CIBSE 1997；Bunn 1993）。单元:双引文:研讨会，ASHRAE交易，第107卷，第。2.

Standard meteorological data for use by HVAC engineers commonly overestimate zero and low wind speed occurrences due to the use of the robust, rotating cup anemometers. These data will, therefore, significantly underestimate wind-driven natural ventilation and also pollution dispersal (of interest in health and safety respects). Measurements presented in this paper, taken with a standard meteorological rotating cup anemometer (as used by the U.K. Met Office) alongside an ultrasonic anemometer, show that due to inertia and friction, the rotating cup anemometer can indicate zero wind speed over many hours in a day when, in fact, speeds of up to 1.5 m/s (4.9 ft/s) can be present. The rotating cup anemometer is shown to be increasingly inaccurate as the wind speed drops below 3 m/s (9.8 ft/s). The paper describes how more accurate low wind data can be extracted from rotating cup measurements using a weibull nonlinear least squares fit to higher speed data. Figure 1 Ventilation funnels or chimneys at the DeMontfort Queen's building (CIBSE 1997; Bunn 1993).Units: Dual