空调系统动态能耗分析与仿真

发布时间：2018-09-17 18:21

【摘要】：空调系统是建筑耗能的主要部分，大约占建筑总能耗的60%，在日益注重节能的今天，建筑节能受到越来越多的重视。然而现在部分空调系统的运行存在很大的问题，，空调系统大部分时间都处于部分负荷下运行，而部分负荷下空调系统的运行状态并没有达到最优，造成了严重的浪费。本文通过模拟动态负荷下空调系统的运行，找到动态负荷下使空调系统处于最节能状态的控制策略，从而保证空调系统能以比较合理的状态运行。本文主要从空调系统动态运行的角度对空调系统的能耗进行研究。用MATLAB/Simulink工具箱对空调系统的各组成部分建立仿真模型，然后将这些部件的仿真模型组合构成整个空调系统的仿真模型。文中选取影响空调系统能耗的关键参数冷冻水出口温度、冷冻水流量、冷却水进口温度、冷却水流量为模型变量，通过空调系统模型的运行数据拟合得出空调系统能耗与四个变量的函数关系式，然后得出定负荷下使空调系统能耗最小的四个变量的值，进而得出动态负荷下空调系统最优运行状态下四个变量随负荷变化的输入曲线。在此基础上，对空调系统的动态能耗进行仿真，得到空调系统节能的最优运行状态。通过以上的研究可以得出，动态负荷下空调系统处于最优运行时最大节能率可达30%，冷水机组、冷冻水泵、冷却水泵节能效果比较显著。本文的研究结果对实际中空调系统的优化运行具有一定的参考价值。
[Abstract]:Air conditioning system is the main part of building energy consumption, which accounts for about 60% of total building energy consumption. Nowadays, more and more attention is paid to building energy efficiency. However, there are a lot of problems in the operation of some air conditioning systems. Most of the time the air conditioning system is running under partial load, but the operating state of the air conditioning system under partial load is not optimal, which has caused a serious waste. By simulating the operation of air conditioning system under dynamic load, the control strategy of making air conditioning system in the state of most energy saving under dynamic load is found in this paper, so as to ensure that the air conditioning system can run in a more reasonable state. In this paper, the energy consumption of air conditioning system is studied from the point of view of dynamic operation of air conditioning system. The simulation model of each component of air conditioning system is established with MATLAB/Simulink toolbox, and then the simulation model of these components is combined to form the simulation model of the whole air conditioning system. The key parameters affecting the energy consumption of air conditioning system, such as the outlet temperature of refrigerated water, the flow rate of frozen water, the inlet temperature of cooling water and the flow rate of cooling water, are selected as model variables. By fitting the operating data of the air conditioning system model, the functional relationship between the energy consumption of the air conditioning system and the four variables is obtained, and then the value of the four variables that make the energy consumption of the air conditioning system minimum under the constant load is obtained. Then the input curves of four variables with load are obtained under the optimal operating condition of air conditioning system under dynamic load. On this basis, the dynamic energy consumption of the air conditioning system is simulated, and the optimal operation state of the air conditioning system is obtained. Through the above research, it can be concluded that under the dynamic load, the maximum energy saving rate of the air conditioning system in the optimal operation can reach 30%, and the energy saving effect of the chillers, chilled water pumps and cooling pumps is quite remarkable. The results of this paper have certain reference value for the optimization operation of air conditioning system in practice.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU831

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