【作者】 杨玲；

【导师】 刘应清；

【作者基本信息】 西南交通大学 ， 机械工程， 2005， 硕士

【摘要】 空调水系统作为空调系统的重要组成部分,其设计合理与否与系统运行状况和节能水平息息相关,因此对空调水系统进行优化既产生社会效益又产生经济效益。经过多年的发展,空调水系统在各方面都有了很大的改进,系统运行的灵活性和节能性都有了很大的提高;但是空调水系统尤其是国内空调水系统仍存在一些不足,尤其是对水系统的可调控性和水力平衡重视度不够,导致在实际运行中出现一些问题。 本文在国内外空调水系统研究成果的基础上,并结合实际工程反馈的信息,对强化空调水系统的可调控性和水力平衡上作了进一步的研究。本文深入分析了空调水系统中各类常用阀门的应用,着重分析了各类平衡阀和压差旁通阀在系统中的合理设置,同时对阀门易忽略导致运行出现问题的特性加以强调。本文还应用网络图论的思想将空调水系统模型化,编制了可根据管网结构计算水系统流量分配的程序,得出了异程式管路对中等规模空调水系统运行影响较小的结论;同时还根据空调水系统支路的可调比的量化定义,编制程序计算可调比,从而指导管网设计和阀门选型。针对目前多用的多机组并联空调水系统,分析各种台数控制方法的优劣,并针对部分机组运行水泵易出现过载的现状分析原因,提出选择水泵和管路设计时应合理选择水泵性能曲线和管路性能曲线。更多还原

【Abstract】 As an important part of HVAC systems the chilled water system decide the operation mode and the energy-saving level of HVAC system. So the optimized design of chilled water system bring social benefit and economical benefit. The chilled water system has been developed in operational flexibility and efficiency in recent years. But all the chilled water system, especially in our country, still remains many problems unresolved, such as: regardless of adjustability and hydraulic balance of hydraulic networks leads to some troubles in practical running.In this paper means of enhancing adjustability and hydraulic balance of hydraulic networks were deeply studied based on the existed HVAC systems and actual projects. The research includes: analyzing the application and selection of all kinds of valves in chilled water system, especially balancing valve and differential pressure by-pass valve, applying Network Graph Theory to simulate the chilled water system, writing a program which can educe the flux distribution data in the chilled water system, drawing a conclusion that direct return system is feasible in medium-sized projects, writing a program to calculate the adjustability of branches in hydraulic networks according to the structure of networks, optimizing the design of networks and selection of valves according to the calculated adjustability. Furthermore in this paper several optimizing measures which can ensure the paralleled multi-chillers chilled water system run reliably in part load mode were presented.更多还原