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首页> 外文会议>ASME(American Society of Mechanical Engineers) Energy Sustainability Conference; 20070627-30; Long Beach,CA(US) >Integrated Static Pressure Reset with Fan Airflow Station in Dual-duct VAV System Control
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Integrated Static Pressure Reset with Fan Airflow Station in Dual-duct VAV System Control

机译：双通道VAV系统控制中带有风扇气流站的集成式静压复位

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摘要

Air duct static pressure is usually a control variable maintained by the supply fan for variable air volume (VAV) systems. Typically the air static pressure is set at a constant set point based on design conditions. However, under partial load conditions, terminal box dampers have to be closed more since required airflow is less than the design airflow which directly results in significantly smaller pressure loss. Thus no matter the terminal boxes are pressure dependent or pressure independent, the static pressure set point should be reset to a lower level to reduce the fan energy, the noise in the terminal boxes, and the terminal boxes malfunction. With the static pressure reset, the room condition can also be maintained better at lower fan energy consumption by minimizing simultaneous cooling and heating. This paper proposes to control the static pressure in dual-duct variable air volume systems by using supply fan variable frequency drives (VFDs) and installing hot air dampers in the hot deck. The static pressure set point is reset based on fan airflow measured by fan airflow station (FAS). With regard to affecting factors of space load, availability of terminal box damper position and space cooling demand, this integrated method has advantages over the existing measures such as fixed static pressure, static pressure reset by outside air temperature, static pressure reset by VAV box damper position and static pressure reset by cooling loop output. According to both the model analysis and case building study, it turns out that this method can significantly save fan power.
机译：对于可变风量（VAV）系统，风道静压通常是由送风风扇维持的控制变量。通常，基于设计条件将空气静压设置在恒定的设定点。但是，在部分负载条件下，接线盒风门必须关闭得更多，因为所需的气流小于设计的气流，这直接导致压力损失明显减小。因此，无论接线盒是压力相关的还是压力无关的，静压设定点都应重置为较低的水平，以减少风扇的能量，接线盒中的噪音以及接线盒的故障。通过重置静压，还可以通过最大程度减少同时冷却和加热的情况，在较低的风扇能耗下更好地保持室内条件。本文建议通过使用送风机变频驱动器（VFD）并在热平台中安装热风挡板来控制双通道可变风量系统中的静压。根据风扇气流站（FAS）测得的风扇气流来重置静压设定点。在影响空间载荷，接线盒风门位置的可用性和空间冷却需求等因素方面，该集成方法具有优于现有措施的优势，例如固定静压，外部空气温度复位的静压，VAV盒风阀复位的静压。通过冷却回路输出复位位置和静压。根据模型分析和案例研究，结果表明该方法可以显着节省风扇功率。

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