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An improved part-load airflow and power model for fan-powered terminal units with electronically commutated motors

机译：具有电子换向电动机的风扇动力终端单元的改进的部分负载气流和功率模型

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摘要

Part-load performance models for fans driven by electronically commutated motors in fan-powered terminal units were developed based on the analysis of data from 36 series and parallel units provided by four manufacturers. Fan motors ranged from 0.33 to 1 hp (249 to 746 W) and maximum external static pressures from 0.5 to 0.75 in. w.g. (125 to 188 Pa). Part-load performance was estimated from the intersection of the duct system and fan curves. The intersection of the two curves determined the external static pressure for estimating both fan airflow and power. Part-load airflow and power fractions were then estimated by using the airflow and power at the maximum airflow controller setting as the reference. The part-load curve tracked close to the fan law curve at airflow fractions above 0.4. The deviation between the two curves was 18.8% at an airflow fraction of 0.4 and increased at lower airflow fractions. The power consumption of motor controller may contribute to the deviation from the fan law curve at airflow fractions below 0.4. The model can estimate the part-load performance for fan-powered terminal units with electronically commutated motors in building simulation programs considering the wide range in fan motor sizes and maximum static pressures in the dataset.
机译：根据来自四个制造商提供的36系列和并行单元的数据分析，开发了由风扇供电终端单元中的电子换向电动机驱动的扇形换档性能模型。风扇电机的范围为0.33至1 HP（249至746 W），最大外部静压从0.5至0.75英寸。 （125到188 PA）。从管道系统和风扇曲线的交叉点估计部分负荷性能。两条曲线的交叉点确定了用于估计风扇气流和功率的外部静压。然后通过使用最大气流控制器设置为参考的气流和功率来估计部分负载气流和功率级分。在气流级分以上0.4的气流级分靠近风扇法曲线跟踪的部分负荷曲线。在0.4的气流分数下，两条曲线之间的偏差为18.8％，并且在较低的气流级分时增加。电动机控制器的功耗可能有助于在0.4以下的气流馏分下与风扇律曲线的偏差。该模型可以估计风扇供电终端单元的部分负载性能，在考虑风扇电机尺寸的宽范围和数据集中的最大静电压力方面，建立模拟程序中的电子换向电动机。

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