摘要
目的研究用户供暖系统水力工况变化对集中供热管网影响,找出用户系统调节供热量对热网水力和热力的影响规律.方法将用户与热网连接形式分为直接连接和间接连接两类,依据供热调节基本原理,建立供暖用户自主用热调节供热量后对热网影响的数学表达式,利用Excel软件拟合函数.结果当用户直接连接时,热网的热力和水力工况的变化规律与用户相同,此时热网的流量处于变化中;当用户间接连接时,用户系统的流量逐渐调小时,热网回水温度逐渐升高,供回水温差逐渐减小,供热量逐渐减小,但热网的流量不受影响.结论不论供暖用户与热网采用何种连接形式,用户供暖系统水力工况变化对供热管网都将产生影响,用户直接连接时,热源应采用变速泵,以适应由于用户调节流量而造成的变流量系统;用户间接连接时,热网流量不变,热源可以采用恒速泵.
In order to understand the influence of heating hydraulic changes upon heating network, based on the theoretical analysis, this paper aims to find out laws of the influence of indoor heating regulation upon heating network. The connected systems can be divided into two parts：direct and indirect. The research is to establish the mathematical expression to show the influence of automatic changes of heating supplying for each unit on the heating network, by applying the fitting function of software Excel. The paper reaches the result that when indoor heating system is directly connected to heating network, the consistency being kept between heating network and indoor heating system with the variable heating supply and variable-speed pumps, meanwhile its flow in heating network is changing;when the indoor system is indirectly connected to heating network, and the volume of indoor heating system is regulated smaller, correspondingly, the return water temperature of indoor heating system changes higher, the difference in temperatures between supply and return water become smaller, and the heating supply of the indoor heating system is reduced, while the flow of the heating network is stable. In conclusion, whatever connected systems are adopted, the influence of pumps of heating system is produced. When system directly connected, variable-speed pumps should be ap- plied in order to adjust to the variable flow system based on the indoor adjustment;while, when system indirectly connected and flow keeping stable, the consistent-speed pumps can be adopted.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2010年第2期360-364,共5页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(50878133)
辽宁省建筑节能与室内环境控制重点实验室2009年度开放基金项目(JN-200904)
关键词
供暖
供热调节
变速泵
恒速泵
heating
heating adjustment
variable-speed pump
constant-speed pump
