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首页> 外文期刊>ASHRAE Transactions >Identification and Elimination of Hunting Behavior in HVAC Systems
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Identification and Elimination of Hunting Behavior in HVAC Systems

机译：识别和消除HVAC系统中的狩猎行为

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摘要

Undesired oscillations (hunting) in process variables such as fan speeds, and valve and damper openings, in heating, ventilation and air-conditioning (HVAC) systems results not only in suboptimal performance, but also component wear and increased energy costs. This paper first presents a simple algorithm to detect these undesired oscillations in building HVAC systems. The paper then provides the results of a survey done to gauge the magnitude of the problem of hunting in building HVAC systems by implementing the algorithm on data obtained from air-handling units (AHUs) of 10 different buildings on the Texas A&M University campus. Through the survey, it was found that 70% of the chilled-water (CHW) valves hunt for 6% to 78% of the time, and 22% of supply fans exhibited hunting for 6% to 26% of the time. The results of the survey indicate that hunting in building HVAC systems may be a significant problem. To illustrate the cause of this hunting behavior, the paper also presents a simulation model of an AHU that shows that the system gains vary considerably with changing operating conditions. Pi-type control is used to govern most of the operations in building HVAC systems which are designed for a particular operating condition. Due to the nonlinear nature of the HVAC systems, changing operating conditions lead to changing system gains and poor performance of the PI-type controllers. A cascaded control loop architecture is proposed in this paper as a solution to the problem of hunting, and its effectiveness is demonstrated through a simulation example.
机译：在加热，通风和空调（HVAC）系统中，过程变量（例如风扇速度以及阀门和风门的开度）的不希望有的振荡（波动）不仅会导致性能欠佳，还会导致组件磨损和能源成本增加。本文首先提出了一种简单的算法来检测建筑物HVAC系统中的这些不希望的振荡。然后，本文提供了一项调查结果，以通过对从得克萨斯州A＆M大学校园内10个不同建筑物的空气处理单元（AHU）中获得的数据实施算法，来评估建筑物HVAC系统中的狩猎问题的严重程度。通过调查发现，有70％的冷水（CHW）阀门在6％到78％的时间内波动，而22％的送风机在6％到26％的时间内波动。调查结果表明，在建筑HVAC系统中搜寻可能是一个重大问题。为了说明这种振荡行为的原因，本文还提供了一个AHU的仿真模型，该模型表明，系统增益随工作条件的变化而有很大不同。 Pi型控制用于控制建筑物HVAC系统中针对特定运行条件设计的大多数操作。由于HVAC系统的非线性特性，不断变化的运行条件会导致系统增益变化以及PI型控制器的性能下降。本文提出了一种级联控制回路架构作为解决寻线问题的方法，并通过仿真实例验证了其有效性。

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  • 来源
    《ASHRAE Transactions》 |2015年第2期|294-305|共12页
  • 作者

    Rohit Chintala; Christopher Price; Shuangshuang Liang; Bryan Rasmussen;

  • 作者单位

    Department of Mechanical Engineering at Texas A&M University, College Station, TX;

    Department of Mechanical Engineering at Texas A&M University, College Station, TX;

    Department of Mechanical Engineering from Texas A&M University, College Station, TX;

    Department of Mechanical Engineering at Texas A&M University, College Station, TX;

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