带直接数字控制器（DDC）的变风量（VAV）系统由于能提供更好的能效和居住舒适性，已被广泛应用于商业、工业和大型住宅建筑的暖通空调系统中。通常情况下，VAV终端装置定义了最小气流速率，以满足空间通风要求和/或终端加热盘管的正常运行（如果配备）。然而，如果嵌入式气流传感器变得不准确，且设计的最小气流速率小于最小可控气流速率，则可能会发生一系列问题，例如通风不足、气流控制不均匀、风门和操作员寿命缩短，以及能源浪费。本研究旨在确定气流传感器（e。 g、 通过系统设计的实验室和现场试验，提供VAV箱的流量探头、控制器（如VAV箱控制器中的差压传感器、控制器中的数据采集和控制算法）和终端单元系统（如流量探头加传感器/数据采集加控制算法）。

Variable air volume (VAV) systems with direct digital controllers (DDC) have been widely adopted in HVAC systems of commercial, industrial, and large residential buildings, because they provide better energy efficiency and occupant comfort. Normally, a VAV terminal unit defines a minimum airflow rate to satisfy the space ventilation requirement and/or the proper operation of a terminal heating coil, if so equipped. However, if the embedded airflow sensor becomes inaccurate, and the designed minimum airflow rate is less than the minimum controllable airflow rate, then a series of problems could happen, such as a lack of ventilation, uneven control of airflow, reduced damper and operator life, and energy waste. This study aims at identifying the strong factors and the relationship between the strong factors and the performance of the airflow sensor (e.g. flow probe provided with the VAV box), controller (e.g. differential pressure transducer included in a VAV box controller, and the data acquisition and control algorithms included in the controller), and terminal unit system (e.g. flow probe plus transducer/data acquisition plus control algorithm) through systematically designed laboratory and field tests.