冷水机组建模及其在空调系统优化控制中的应用研究

发布时间：2018-11-06 13:27

【摘要】：随着社会经济的快速发展,中央空调系统在生活中得到了广泛应用,空调系统的节能问题已成为建筑节能领域的研究热点。由于水系统约占空调总能耗的60%-80%,因此,水系统节能优化研究成为空调系统节能的重要内容。在空调系统中,水系统主要包含两部分:冷冻水系统及冷却水系统。截止目前,针对冷冻水系统的节能技术研究已经较为成熟,而在冷却水系统中由于冷却水泵、冷却塔及冷机能耗之间存在着耦合关系,因此可以通过各设备的运行状况确定最佳的运行状态。但是基于冷却水系统的研究较多是在多次实验的基础上得出的结论,较少抽象到理论分析高度的研究。本文结合西安建筑科技大学变风量中央空调实验平台提出了一种基于冷水机组建模的空调系统优化控制策略,该研究方法是在空调系统稳定运行的情况下,通过建立某一负荷率下冷水机组及冷却塔风机的能耗数学模型寻找冷却水系统的最优运行点,并通过实验验证了模型的准确性。也解决了冷却水系统在不同工况下需经过多次实验确定最优点的问题,在实现上既简单又较为精确。为了实现上述研究,本文分别建立了供回水压差控制模型、送风温度控制模型和冷却塔出水温度控制模型,同时设计了增量式控制PID控制器和单神经元自适应PID控制器,以达到良好的控制效果。此外,本文将冷机建模的方法应用在西安环普产业园的实际系统中,并根据产业园空调系统的实际运行工况寻找了最佳的冷却塔台数切换点以达到系统能耗的降低。
[Abstract]:With the rapid development of social economy, central air conditioning system has been widely used in daily life. The energy saving problem of air conditioning system has become the research hotspot in the field of building energy conservation. Since water system accounts for about 60 to 80 percent of the total energy consumption of air conditioning, energy saving optimization of water system has become an important part of energy saving of air conditioning system. In air conditioning system, water system consists of two parts: chilled water system and cooling water system. Up to now, the research on energy saving technology of chilled water system has been more mature, but in the cooling water system, there is a coupling relationship between cooling water pump, cooling tower and cooling machine energy consumption. Therefore, the best operation state can be determined by the operation condition of each equipment. However, the research based on cooling water system is based on many experiments, less abstract to theoretical analysis. Based on the experimental platform of VAV central air conditioning in Xi'an University of Architectural Science and Technology, this paper presents an optimal control strategy for air conditioning system based on the modeling of chillers. The research method is based on the stable operation of the air conditioning system. The optimal operating point of cooling water system is found by establishing the mathematical model of energy consumption of chiller and cooling tower fan under a certain load rate, and the veracity of the model is verified by experiments. It also solves the problem that the cooling water system needs many experiments to determine the most advantages under different working conditions, and it is simple and accurate in realization. In order to realize the above research, the control models of the pressure difference between supply and return water, the temperature control model of the air supply and the outlet temperature of the cooling tower are established respectively, and the incremental control PID controller and the single neuron adaptive PID controller are designed at the same time. To achieve good control effect. In addition, this paper applies the modeling method of cooling machine to the practical system of Xi'an Huanpu Industrial Park, and according to the actual operating conditions of the air conditioning system in the Industrial Park, the best switching point of cooling tower number is found to reduce the energy consumption of the system.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU83;TP273

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