既有办公建筑变风量空调系统诊断及改造

VAV System Diagnosis and Transformation of Existing Office Buildings

既有办公建筑的变风量空调系统普遍存在VAVbox入口直管段过短、二次风采用过长或弯折的软管、单独隔间回风不畅等问题。相关自控系统则存在风量传感器不准、风机变频逻辑缺失、楼控系统卡顿等。针对既有办公建筑的变风量空调系统的常见问题,通过实际项目案例介绍了诊断、改造及优化的方法。通过诊断明确问题症结,提出改造建议。改造目标是修补空调系统缺陷、恢复变风量控制功能及满足现有房间的个性化需求。改造完成后,对系统能力、控制逻辑及室内效果进行验证,并基于效果验证进行自控参数优化调适,最终实现变风量空调的自动运行。对既有办公建筑变风量空调系统的诊断及改造提供了清晰的思路。

The VAV air conditioning system of existing office buildings generally has some shortcomings,such as short straight pipe section of VAVbox entrance,long or bent hose used for secondary air flow,and poor return air in separate compartment.In the relevant automatic control system,the air volume sensor is not accurate,the fan frequency conversion logic is missing,and the building control system is stuck.Against the co mmon problems of VAV air-conditioning system in existing office buildings,this paper introduces the methods of diagnosis,transformation and optimization through an actual project.Through diagnosis,the author identifies the cruxes of the problems and puts forward transformation suggestions.The objectives of the transformation are to repair defects,restore VAV control functions and meet the personalized needs.After the transformation,the author verified the system capability,control logic and indoor effect.Then,the automatic control parameters are optimized and adjusted based on the effect verification.Finally the automatic operation of VAV air conditioning is realized.This paper provides a clear idea for the diagnosis and transformation of VAV system of existing office buildings.