基于TRNSYS的中央空调冷源系统运行优化研究

发布时间：2019-04-15 14:32

【摘要】：随着我国建筑能耗占社会总能耗比例的增大,建筑节能,特别是大型公共建筑的节能越来越受重视。中央空调系统是大型公共建筑的能耗大户,运行过程中存在许多能源浪费的现象,需要加强管理,合理设置运行参数。冷源系统能耗占中央空调系统总能耗的比例超过60%,其运行参数的优化对整个系统的经济运行具有重要意义。本文以广州市某大型公共建筑中央空调冷源系统为研究对象。利用中央空调监控管理系统采集到的冷源系统实际运行数据建立冷水机组、水泵、冷却塔的数学模型,并对各模型的准确性进行了验证。利用TRNSYS软件建立自定义模块的功能,将这些设备的数学模型编程后经过编译、链接生成TRNSYS可以直接调用的模块。建立Matlab控制模块和添加其他必要辅助模块,最终组建成中央空调冷源系统TRNSYS仿真平台。利用TRNSYS仿真平台分析冷源系统各设备运行效率的影响因素。在此基础上,分别分析了冷冻水变流量和冷却水变流量对冷冻水系统和冷却水系统运行能效的影响。结果表明,在一定条件下,存在使冷冻水系统运行能效最高的冷冻水流量,同样也存在使冷却水系统运行能效最高的冷却水流量。通过选取优化变量、确立目标函数、确定和处理约束条件,建立了冷源系统运行参数优化模型,并利用遗传算法对其进行了求解。利用仿真平台,以某天建筑实际的冷负荷和室外温湿度作为已知条件,对冷源系统的运行参数进行了优化,得到使冷源系统运行能效EERr最高的冷冻水供水温度、冷冻水流量、冷却水流量、冷却塔风量。通过与实际运行参数对比,优化后系统总能耗降低了7.07%,验证了该优化方法的可行性。
[Abstract]:With the increase of building energy consumption to the total energy consumption, building energy efficiency, especially the energy conservation of large-scale public buildings, has been paid more and more attention. The central air conditioning system is a large energy consumption household in large public buildings. There are many phenomena of energy waste in the operation process. It is necessary to strengthen the management and set the operating parameters reasonably. The energy consumption of the cold source system accounts for more than 60% of the total energy consumption of the central air conditioning system. The optimization of the operation parameters is of great significance to the economic operation of the whole system. This paper takes the central air conditioning cold source system of a large public building in Guangzhou as the research object. The mathematical models of water chiller, water pump and cooling tower are established by using the actual operation data of the cold source system collected by the central air conditioning monitoring and management system, and the veracity of each model is verified. The function of custom modules is established by using TRNSYS software. The mathematical models of these devices are programmed and compiled, and the modules which can be directly invoked by TRNSYS are generated by linking. The Matlab control module and other necessary auxiliary modules are added, and finally the TRNSYS simulation platform of the central air conditioning cold source system is established. The TRNSYS simulation platform is used to analyze the influencing factors of the operation efficiency of each equipment in the cold source system. On this basis, the effects of variable flow rate of frozen water and variable flow rate of cooling water on the energy efficiency of refrigerated water system and cooling water system are analyzed respectively. The results show that, under certain conditions, there is the flow rate of frozen water which makes the refrigerated water system operate the most energy-efficient, and the cooling water flow rate which makes the cooling water system run the most energy-efficient. The optimization model of operation parameters of cold source system is established by selecting optimization variables, establishing objective function, determining and dealing with constraint conditions, and solving the optimization model by genetic algorithm. By using the simulation platform and taking the actual cooling load and outdoor temperature and humidity of the building as the known conditions, the operating parameters of the cold source system are optimized, and the water supply temperature and the flow rate of the frozen water with the highest energy efficiency of EERr for the operation of the cold source system are obtained. Cooling water flow, cooling tower air volume. Compared with the actual operation parameters, the total energy consumption of the optimized system has been reduced by 7.07%, and the feasibility of the optimization method has been verified.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU831

【共引文献】