近年来，人们越来越重视风机和系统的评级、编目和测试，以确保其正常运行，并将能源消耗降至最低。因此，系统设计中的安全系数降低了，因此，无论是计算的系统阻力还是风扇性能，误差都很小。因此，至关重要的是，那些可能影响风扇性能和影响程度的项目必须成为我们常识的重要组成部分。多年来，人们已经知道，在实验室测试的风机一旦安装在现场，可能不会执行相同的操作。已经有几篇文章描述了这些现象。“启动该项目是为了更详细地解决实验室风机额定值与现场条件下获得的实际性能之间的差异问题。现场安装条件，包括管道系统组件的具体位置和设计，可能会影响风机的性能。 这些因素不仅影响流量和风扇静压，还影响风扇制动功率。ASHRAE和空气运动与控制协会（AMCA）利用AMCA测试实验室的设施和工作人员启动了A实验室测试项目。编制了测试计划，并将项目分为几个阶段，以便重点关注范围中概述的各种测试参数。重点放在实现现实的目标上。本报告描述了第一阶段的结果。第一阶段代表了两种相同尺寸的风机类型在不同入口和/或出口风管配置的选定风机速度下运行的400多个单独测试的结果。本报告提供了基本信息，并为该领域的未来项目奠定了基础。仍然需要为设计师开发准确的安装风扇额定值信息。提出了系统效应和系统效应因子的概念，作为解决这一问题的可行途径。 系统效应是指由于风机入口或出口处的各种流动条件而导致风机性能的变化。在选择风机时，系统影响系数应与系统阻力特性结合使用，并应用于现场试验结果的计算中。这个概念有助于将现场测试和实验室风扇额定值测试的结果关联起来。引文:新墨西哥州阿尔伯克基市阿什雷学报第84卷第2部分

In recent years there has been increased emphasis placed upon the rating, cataloging, and testing of fans and systems to assure their proper operation and to minimize the consumption of energy. As a result, safety factors in system design have been reduced so that there is very little allowance for error either in the calculated system resistance or the fan performance. It is, therefore, essential that those items which can affect fan performance and the magnitude of that effect become an important part of our general knowledge.It has been known for many years that a fan tested in the laboratory may not perform the same once it is installed in the field. Several articles have been written which describe these phenomena. "This project was initiated to address the problem, in much greater detail, of variations between laboratory fan ratings and the actual performance obtained under field conditions. Field installation conditions, including the specific location and design of ductwork components, can affect a fan's performance. These elements influence not only the flow rate and fan static pressure, but also the fan brake horsepower. A-laboratory test program was initiated between ASHRAE and the Air Movement and Control Association (AMCA) utilizing the facilities of the AMCA testing laboratory and staff. A test schedule was prepared and the program was divided into phases, in order to focus on the various testing parameters, as outlined in the Scope. Emphasis was placed on achieving realistic goals. This report describes the results of Phase I. Phase I represents the results of over 400 individual tests on two fan types of identical size operated at selected fan speeds with various inlet and/or outlet duct configurations. This report provides basic information and develops a basis for future projects in this field. There remains a need to develop accurate installed fan rating information for designers. The concept of system effect and system effect factors is offered as a viable approach to resolving this problem. System effect is defined as the change in performance of a fan due to various flow conditions at the fan inlet or outlet. System effect factors are intended to be used in conjunction wi th th·e system resistance characteristics in the selection of fans, and also applied in the calculations of the results of field tests. This concept helps to correlate results offield tests and laboratory fan rating tests.