- 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