As air distributor in a variable air volume system , the performance of slot diffuser is the best one , but the type of diffuser is too expensive , so at home many firms try to choose square diffuser 条缝形散流器作为变风量系统的空气分布器其性能是最好的，但这种条缝形散流器过于昂贵，故国内许多公司选择采用方形散流器。
To stand out the usage of the study , this paper selects some typical or idiographic objects to study , including building construction type , weather conditions , hvac system type and its operating procedures 其中气象条件为长沙地区2002年全年的气象资料，建筑类型为办公室建筑，研究的空调系统为单风道定风量系统和变风量系统，运行方式为间隙运行。
Through thorough analysis , we finally drew that on condition of experiment , square diffuser could ensure good air distribution when air supply volumes ranged from 40 to 50 percent or 80 to 100 percent of the maximum air supply volumes . when air supply volumes ranged from 50 to 80 percent of the maximum air supply volumes , square diffuser could not be very ideal with a variable air volume in a cooling mode 经过全面分析，最后得出主要结论：在实验条件下，当送风量处于最大送风量的40 50或80 100范围内时，方形散流器可满足室内气流分布的要求；当送风量处于最大送风量的50 80范围内时，方形散流器用于变风量系统供冷工况不理想。
Abstract : based on an investigation of some projects involving vav air conditioning systems in shanghai , describes the general status of these projects , system modes , air distribution , indoor air quality , noise control , duct design and automatic control , and predicts the future prospect of vav system application 文摘:介绍了对上海地区采用变风量空调系统的部分工程的调研情况，分析总结了工程概况、变风量系统的方式、气流组织、室内空气品质、噪声控制、风道设计、自动控制等，对其应用前景作了展望。
