本文讨论了住宅用商用气流罩的精度。实验室和现场试验的结果表明，这些通风罩不足以测量住宅系统中的气流，不同流量通风罩之间的测量差异可能很大。这些误差是由于校准不良、发动机罩对格栅气流不均匀性的敏感性，以及增加的流动阻力导致的流量变化造成的。如果仔细进行现场试验，格栅合适，并且格栅位置不限制导流罩的放置，则使用一些导流罩可以获得合理的结果。我们还评估了几种用于测量格栅气流的简单流量捕捉技术，这些技术可被暖通空调行业和房主用作简单诊断。 这些简单的技术可以像商用设备一样精确。我们的测试结果还表明，目前的流罩校准程序没有考虑现场应用问题。因此，各机构需要制定一个新的流量罩校准标准，以及一个新的测量标准，以解决流量捕捉技术的现场使用问题。单位:双引文:研讨会，ASHRAE交易，第109卷，第。堪萨斯城，2003年

This paper discusses the accuracy of commercially available flow hoods for residential applications. Results of laboratory and field tests indicate these hoods can be inadequate to measure airflows in residential systems, and there can be large measurement discrepancies between different flow hoods. The errors are due to poor calibrations, sensitivity of the hoods to grille airflow non-uniformities, and flow changes from added flow resistance. It is possible to obtain reasonable results using some flow hoods if the field tests are carefully done, the grilles are appropriate, and grille location does not restrict flow hood placement. We also evaluated several simple flow capture techniques for measuring grille airflows that could be adopted by the HVAC industry and homeowners as simple diagnostics. These simple techniques can be as accurate as commercially available devices. Our test results also show that current calibration procedures for flow hoods do not account for field application problems. As a result, agencies need to develop a new standard for flow hood calibration, along with a new measurement standard to address field use of flow capture techniques.Units: Dual