空调水系统节能控制若干问题试验研究

发布时间：2018-04-19 16:22

本文选题：空调水系统 + 最不利热力环路　；参考：《大连理工大学》2013年硕士论文

【摘要】：随着我国经济社会的高速发展,建筑能耗在社会总能耗的比例越来越大,己由2007年的24.5%增加到2012年的32%,而大型公共建筑能耗占建筑总能耗的22%,中央空调系统的耗电量占大型公共建筑总耗电量的50～60%,中央空调系统必将成为建筑节能的重点。在空调系统的实际运行中,首先,绝大多数的空调水系统末端没有连续型电动调节阀,很难实现对空调水系统末端设备的调节控制,加大了水系统的输送能耗。其次,空调水系统在启动时间和启动方式上相差很大,完全凭运行人员主观经验启停空调系统,缺乏科学的决策。另外,在许多变频控制的空调水系统中,水泵变频控制的依据---水系统压差监测点位置的选择也多种多样,导致空调水系统循环泵能耗大小不一。因此,针对上述问题,根据对实际空调系统检测和诊断结果,以及空调水系统诸多问题的研究要求,建立通用的空调水系统智能控制试验平台。针对上述问题进行研究开发,对降低空调系统运行能耗、建筑节能减排具有重要的学术和实用价值。首先,本文针对某实际空调系统的检测,针对空调水系统控制调节性问题,设计并建设了中央空调系统智能控制试验平台,包括空调水系统、电气系统和网络控制系统。在此基础上对试验台各设备、管路、传感器、执行机构等机电设备系统的特性进行测试分析,为后续的试验研究工作奠定了试验基础。, 其次,本文引入空调水系统最不利水力环路和最不利热力环路的概念,并进行了辨析,针对末端没有阀位反馈的空调水系统,提出了以房间温度和供回水温差为参考量的空调水系统最不利热力环路辨识方法,通过试验验证了该方法的可行性。第三,本文针对空调系统的启动时间和启动方式,试验研究空调水系统并联水泵启动台数和上班前预冷启动时间,分析了空调水系统总体能耗大小,结果表明,针对本试验系统中的两台并联水泵,在预冷阶段同时联合启动要比单独启动一台时能耗要小。最后,本文针对水泵变频控制中压差参考点的选择进行了研究,试验表明,压差参考点设置在空调水系统主干管中间位置时,循环水泵的能耗最低。上述问题为空调水系统在实际运行中普遍存在的共性问题,所研究的调节控制方法对实际空调水系统的运行调试具有较大的参考价值。
[Abstract]:With the rapid development of our country's economy and society, the proportion of building energy consumption in the total energy consumption of society is increasing.It has increased from 24.5% in 2007 to 32% in 2012, while the energy consumption of large public buildings accounts for 22% of the total energy consumption of buildings, and the power consumption of central air conditioning system accounts for 50% of the total energy consumption of large public buildings, so the central air conditioning system will become the focus of building energy saving.In the actual operation of air conditioning system, first of all, most of the air conditioning water system end no continuous electric control valve, it is difficult to achieve the air conditioning water system terminal equipment regulation control, increasing the energy consumption of water system.Secondly, there is a great difference in starting time and starting mode of air conditioning water system. It is completely based on the subjective experience of the operator to start and stop the air conditioning system, so it lacks scientific decision.In addition, in many air conditioning water systems controlled by frequency conversion, the selection of pressure difference monitoring points of water system based on frequency conversion control of water pump is various, which leads to different energy consumption of circulating pump in air conditioning water system.In view of the above problems, according to the test and diagnosis results of actual air conditioning system and the research requirements of many problems of air conditioning water system, a general intelligent control test platform for air conditioning water system is established.Aiming at the above problems, it is of great academic and practical value to reduce the energy consumption of air conditioning system and to save energy and reduce the emission of buildings.Firstly, the intelligent control test platform of central air conditioning system is designed and constructed, which includes air conditioning water system, electric system and network control system.On this basis, the characteristics of each equipment, pipeline, sensor, actuator and other electromechanical equipment system of the test bed are tested and analyzed, which lays the test foundation for the subsequent test research.Secondly, this paper introduces the concepts of the most unfavorable hydraulic loop and the most unfavorable thermal loop of the air conditioning water system, and analyzes it, aiming at the air conditioning water system with no valve feedback at the end.A method for identifying the most unfavorable thermal loop of air conditioning water system using room temperature and temperature difference between supply and return water as reference is proposed. The feasibility of this method is verified by experiments.Thirdly, aiming at the starting time and starting mode of air conditioning system, the paper studies the number of parallel water pump start-up units and pre-cooling start-up time before going to work, and analyzes the total energy consumption of air conditioning water system. The results show that,For the two parallel water pumps in this test system, the energy consumption of the two parallel pumps in the pre-cooling stage is lower than that in the single start-up stage.Finally, this paper studies the choice of reference point of pressure difference in variable frequency control of water pump. The experiment shows that when the reference point of pressure difference is set in the middle of the main pipe of air conditioning water system, the energy consumption of circulating water pump is the lowest.The above problems are the common problems in the practical operation of air conditioning water system, and the methods of regulating and controlling are of great reference value to the operation and debugging of air conditioning water system.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU831

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