区域供热间接连接二次网供暖系统仿真  

Simulation for Heating System Indirectly Connected to the Secondary Heating System

作　　者：王宏伟[1] 刘智超[1] 郝红[1] 

机构地区：[1]沈阳建筑大学市政与环境工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2015年第3期516-523,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家科技支撑计划项目(2011BAJ05B01-04);辽宁省教育厅科学技术研究项目(L2013228)

摘　　要：目的研究区域供热系统的热滞后性,为降低采暖系统能耗并达到按需供热提供理论支持.方法基于质量和能量守恒定律及传热学原理,创建间接连接集中供热系统二次系统各个环节的数学模型,并运用MATLAB/Simulink建立相应的仿真模型,以沈阳某住宅小区为研究对象,仿真分析该供热系统的温度响应,观察系统的动态特性.结果在时间为15 h时,室外温度从-16.8℃阶跃到-5℃,室内温度达到稳定时间约为4 h,换热器回水温度达到稳定时间约为5.5 h,供水温度达到稳定时间约为6.5 h,供热量超出500 k W.结论区域供热系统存在较大的热滞后性,热源部分不能根据室外温度的改变而及时的改变供热量.这就需要对供热系统及时进行准确的负荷预测,然后利用预测的结果来指导供热系统的调节,实现热源的供热量随时与用户的需热量保持一致,从而达到按需供热.The aim of this paper is to study the large thermal hysteresis of district heating systems, so as to provide some theoretical supports for demand heating. Taking a residential district in Shenyang as the research object, based on the principle of heat transferring and the law of conservation of mass and energy, a mathematical model for the secondary network of indirectly connected dis- trict heating system was built and temperature responses were simulated and dynamical characters were also observed using MATLAB/Simulink. It is found that at the time of 15 h ,the outdoor tem- perature rapidly increases form - 16.8 ℃ to - 5 ℃. The indoor temperature reaches stability a- bout in 4 hours. The return water temperature of the heat exchanger is in stability about in 5.5 hours and the supply water temperature reaches stability about in 6.5 h. The supplying heat exceeds 500 kW. Conclusion is that the district heating system has a large thermal hysteresis. It cannot adjust heating load according to the outdoor temperature. In order to achieve heat requirements of users, it requires timely and accurately forecast load for heating system to guide adjustment of heating system, so as to realize demand heating.

关 键 词：热滞后性 数学模型 仿真 负荷预测 按需供热 

分 类 号：TU995.3[建筑科学—供热、供燃气、通风及空调工程]