Design of a Steady-State Detector for Fault Detection and Diagnosis of a Residential Air Conditioner.
Design of a Steady-State Detector for Fault Detection
and Diagnosis of a Residential Air Conditioner.
Kim, M.; Yoon, S. H.; Domanski, P. A.; Payne, W. V.
International Journal of Refrigeration, Vol. 31, No. 5,
790-799, August 2008.
detection; steady state; air conditioning; residential
buildings; compressing; tests; methodology; windows;
fault trees; refrigerants
This paper presents a general methodology for developing
a steady-state detector for a vapor compression system
based on a moving window and using standard deviations
of seven measurements selected as features. The feature
thresholds and optimized moving window size were based
upon steady-state no-fault tests and startup transient
tests. The study showed that evaporator superheat and
condenser subcooling were sufficient for determining the
onset of steady-state during the startup transient.
However, they misidentified steady-state during indoor
temperature change tests where evaporator saturation
temperature and air temperature change across the
evaporator were needed for proper steady-state
identification. Hence, the paper recommends including
all fault detection and diagnosis (FDD) features in the
steady-state detector to ensure the robustness of the
detector because different features may play key roles
with different transients.