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Characteristics of the regulating object of the chiller regulating system
The regulating object of the chiller regulating system is the most basic link in the regulating system, and all regulating equipment serves it. The regulating system is designed and adjusted according to the characteristics of the regulating object. The quality of the regulating system is not only related to the dynamic characteristics of the regulator, but also to the dynamic characteristics of the regulating object.
In fact, the dynamic characteristics of the regulating object to a certain extent determine the regulating process and regulating quality. The regulator only improves the quality index of the regulating process as much as possible based on the characteristics of the regulating object, and the degree of improvement is also limited by the properties of the regulating object and the regulator. Studying the characteristics of the regulating object is the basis for designing a good regulating system. The quality of adjusting the dynamic characteristics of an object determines its adjustability. The concept of "adjustability of objects" is used to indicate the difficulty level of adjustability of objects. Under the same regulator (or manual adjustment), objects with good adjustability can obtain better adjustability discs.
The characteristics of the object chiller system include two parts: static characteristics and dynamic characteristics. Delay, time constant, and amplification factor (transfer coefficient) are commonly used in automatic adjustment technology to comprehensively represent object characteristics. The dynamic characteristics of an object depend on its dynamic structure, including the properties, number, and connection methods of its constituent elements.
The method of studying the characteristics of the chiller system is to investigate the dynamic and static relationship between the input and output signals of the research object. For the regulated object, the input signal refers to the change in inflow or outflow caused by interference or regulation, which is the reason for the change in the regulated parameters of the object. The output signal is the change in the regulated parameters. When an object is subjected to a step action input signal, the response curve of the object's response signal - the curve of the adjusted parameter changing over time - is called the response curve.
Interference forms are often diverse. When targeting a specific object, based on its actual operation and identifying its main interference form, we can apply a similar interference form to the object. The typical forms of interference commonly used include step changes, constant velocity changes, pulse forms, and periodic fluctuations.
The typical form of interference for a typical object chiller system is step interference, as step interference is equivalent to a sudden change in object load. For fixed value regulation systems, step interference is the most unfavorable form of interference. If an automatic regulation system can overcome step interference, then other forms of interference are not difficult to overcome. Therefore, step interference is taken as a typical interference characteristic of the research object in this book.
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