基于性能试验的实验室排风柜变风量控制系统研究
Research on variable air volume control systems of laboratory fume hoods based on performance test
摘要：
通过试验的方法，对目前3种最常用的排风柜变风量控制方式的面风速、响应时间、稳态时间及示踪气体泄漏率等性能进行研究，并对试验数据进行对比和分析，结果表明，3种不同控制方式均能很好地控制排风柜面风速，但在响应时间、稳态时间及示踪气体泄漏率方面存在明显差异。“位移传感器与文丘里阀”组合变风量控制系统的综合性能较“位移传感器与文丘里蝶阀”组合变风量控制系统更优，柜内污染物泄漏浓度更低。“面风速传感器与蝶阀”组合变风量控制系统的响应时间和稳态时间最长，柜内污染物泄漏风险最高。
Abstract：
In this paper, the performance of the three most commonly used variable air volume (VAV) control methods for fume hoods, such as face velocity control, response time, steady time and tracer gas containment, is studied through test methods, and the test data is compared and analysed. The results show that the three different control methods can effectively control the face velocity of the fume hood, but there are obvious differences in response time, steady time and tracer gas containment. The comprehensive performance of the VAV control system with the combination of the displacement sensor and Venturi valve is better than that of the VAV control system with the combination of the displacement sensor and Venturi butterfly damper, and the leakage concentration of pollutants in the hood is lower. The VAV control system with the combination of face velocity sensor and butterfly damper has the longest response time and steady time, and the highest risk of pollutant leakage in the hood.
Keywords:fumehood;laboratory;variableairvolume(VAV)controlsystem;performancetest;closed-loopcontrol;open-loopcontrol;compoundcontrol