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Design of a Steady-State Detector for Fault Detection and Diagnosis of a Residential Air Conditioner.


pdf icon 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