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In a heating, ventilation, and air conditioning system, an air-handling system is a key module. Its components (e.g., air handling unit, air-mixing box, and fans), linked through airflows, condition air to a desired temperature and/or humidity based on comfort or controlled environment requirements. Identifying failure modes and estimating their severities allow maintenance crews to know which faults...
As major modules of Heating, Ventilation and Air Conditioning (HVAC) systems, Air Handling Units (AHUs) and Variable Air Volume (VAV) boxes are used to condition and circulate air to rooms. To save energy and satisfy human comfort and ventilation requirements, accurately and timely diagnosing their faults is critical. The problem, however, is challenging since (1) Hidden Markov Models (HMMs) can capture...
As a major subsystem of Heating, Ventilation and Air Conditioning systems (HVACs), a chiller plant provides chilled water to remove heat from buildings. Faults in a chiller plant can result in high energy consumption, and their early diagnoses, including failure modes and fault severities, will lead to significant energy savings. Fault diagnosis, however, is challenging since (1) measured variables...
As one of the major modules of Heating, Ventilation and Air Conditioning systems (HVACs), the Air Handling Unit (AHU) conditions the air and delivers it to rooms to satisfy occupants' comfort requirements. Fault diagnosis for AHUs is challenging because the interactions among components are complex. A fault may cause variations in variables of different constituent components, thus making it difficult...
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