- Author
- Kim, M. | Yoon, S. H. | Domanski, P. A. | Payne, W. V.
- Title
- Design of a Steady-State Detector for Fault Detection and Diagnosis of a Residential Air Conditioner.
- Coporate
- Korea Institute of Energy Research, Daejeon 305-343, Korea National Institute of Standards and Technology, Gaithersburg, MD
- Journal
- 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
- Identifiers
- air conditioner; compression system; Fault Detection and Diagnositc (FDD) methodologies; moving window for steady-state detection; development of the steady-state detector; types and conditions of no-fault tests; establishing the moving window size using startup transient tests; setting feature thresholds based on steady-state data; variations of selected features during steady-state; verification of the steady-state detector using an indoor load change test; test with a 20% refrigerant undercharge fault
- 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