本研究的目的是调查通过组合单个组件（即风扇/电机/控制器、阻尼器和外壳）的模型，可以预测串联风扇供电终端单元（FPTU）的性能。调查了三家制造商生产的八个系列FTPU，它们带有电子换向电机（ECM）。本文第一部分对风机的气流和功率特性进行了实验研究。根据实测数据建立了相应的经验模型。本文的第二部分描述了通过测试阻尼器和外壳开发一次和增压气流模型。主要气流模型预测了通过阻尼器的气流，作为阻尼器角度和阻尼器压差的函数。正压送风系统模型通过使用壳体压差和正压送风系统进气面积来估计引入壳体的空气量。通过系统地组装其组件模型，评估了一系列FPTU的整体性能。 对模型输出和之前研究的实验数据进行了比较。虽然预测的气流与测量结果一致，但基于组件的模型低估了某些机组的风扇功耗。这种差异可能是由风机系统效应引起的，风机系统效应是由壳体内部的气流混合和涡流引起的。这些流动畸变产生的条件与实验室风扇测试中使用的条件不同。引文:ASHRAE交易——第120卷第2部分，华盛顿州西雅图

The goal of this study was to investigate how well the performance of a series fan-powered terminal unit (FPTU) could be predicted by combining the models of its individual components, namely fan/motor/controller, damper, and housing. Eight series FTPUs, from three manufacturers, with electronically commutated motors (ECMs) were investigated. In Part I of this paper, the fan airflow and power performance were experimentally studied. The corresponding empirical models were established fromthe measured data.Part II of this paper described the development of primary and plenum airflow models by testing dampers and housings. The primary airflow model predicted the airflow throughdampers asa function of damper angles and damper differential pressures. The plenum airflow model estimated the amount of air induced into housings by using the housing differential pressures and plenum air inlet areas. The overall performance of a series FPTU was evaluated by systematically assembling its component models.Comparisons were made between model outputs and experimental data from previous studies. While the predicted airflows were in agreement with measurements, the componentbased model underestimated fan-power consumptions for some units. This discrepancy may be caused by fan-system effects that occur as a consequence of flow mixing and swirl inside housings. These flow distortions create a condition that is different from the condition used in the laboratory fan tests.