Deviation of pressure differential from design under static conditions and delayed convergency of pressure fluctuation after dynamic disturbances are widely reported problems associated with pressure differential control in non-isobaric buildings. This study performed field measurements to investigate the pressure differential mechanisms under static and dynamic disturbance in several non-isobaric pharmaceutical factory zones served by either constant air volume or variable air volume (VAV) ventilation systems. Four typical dynamic disturbances including door motion (the process of door opening or closing for 1 s, 2 s, and 3 s), personnel entry and exit, indoor personnel movement, and continuous door opening were considered. The results showed that static pressure differentials deviated significantly from the design requirements, and some of the pressure differentials were even reversed in direction. Depending on the location of the sensor, it took 3–13 s and 3–10 s to detect and stabilize the pressure differential within the zone during door openings and door closings, respectively. Personnel entry and exit induced inevitable brief but intense disturbances in the pressure differential evolution. Ceiling-mounted pressure sensors could not detect fluctuations caused by indoor personnel movement, thus preventing erroneous responses from proportional-integral-derivative (PID)-based VAV valves. However, the VAV valve exhibited slow response and ineffectiveness during door motion and continuous door opening due to unsuitable PID parameters and low-accuracy pressure sensors. To improve the control strategy, exponential models based on the pressure differential evolution during door motion were proposed. The findings provide useful information for real-time and accurate pressure differential monitoring and for developing effective VAV ventilation strategies.

中文翻译：

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非等压建筑区静动态扰动下压差机理的野外研究


静态条件下压差与设计的偏差和动态扰动后压力波动的延迟收敛是与非等压建筑物压差控制相关的广泛报道的问题。本研究进行了现场测量，以研究由恒定风量或可变风量 （VAV） 通风系统服务的几个非等压制药厂区在静态和动态干扰下的压差机制。考虑了门运动（开门或关门过程 1 s、2 s、3 s）、人员进出、室内人员移动和连续开门 4 种典型动态扰动。结果表明，静压差与设计要求明显偏差，部分压差甚至方向相反。根据传感器的位置，在开门和关门期间，分别需要 3-13 秒和 3-10 秒来检测和稳定区域内的压差。人员进出在压差演化中不可避免地引起了短暂但强烈的干扰。安装在天花板上的压力传感器无法检测室内人员移动引起的波动，从而防止基于比例积分微分 （PID） 的 VAV 阀的错误响应。然而，由于 PID 参数不合适和压力传感器精度低，VAV 阀在门运动和连续开门过程中表现出响应缓慢和无效。为了改进控制策略，提出了基于门运动过程中压差演变的指数模型。 研究结果为实时和准确的压差监测以及制定有效的 VAV 通风策略提供了有用的信息。