A statistic method combining principal component analysis (PCA) with joint angle plot is presented to online detect and diagnose fixed bias of temperature and flow rate sensors of air handling unit (AHU).

• 本文针对空调箱的温度、流量等传感器进行固定偏差故障,提出了一种基于统计学的方法进行在线的故障检测和诊断。