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.
(660 K)
Kim, M.; Yoon, S. H.; Domanski, P. A.; Payne, W. V.
International Journal of Refrigeration, Vol. 31, No. 5,
790-799, August 2008.
Keywords:
detection; steady state; air conditioning; residential
buildings; compressing; tests; methodology; windows;
fault trees; refrigerants
Abstract:
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.
Article Outline
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899