CONTINUOUS COMMISIONING BASED ON EXTENDED FAULT DETECTION AND DIAGNOSIS
Gerhard Zimmermann, Yan Lu, George Lo
Buildings seldom perform as intended, resulting in energy use much higher than predicted from design. State-of-the-art HVAC fault detection and diagnosis (FDD) systems report component failures that may corrupt energy efficiency, however FDD does not detect component performance degradation and energy waste from poor designed control sequences. This paper introduces energy related extensions to our pre- vious HFM-FDD system, with which energy consump- tion/production is modeled and simulated in HFM (Heat Flow Model) nodes. The inconsistency between simulated energy data and measured data indicates component performance degradation. In addition, al- ternative control strategies (control algorithms, set- points, etc.) are modeled in the HFM simulation engine to test energy optimization opportunities. All energy calculations can be averaged with short term real data histories. Full year energy evaluations can be produced using standard or local weather files. These extensions that include air and water flow nodes support continu- ous commissioning® (CCx) with operation optimiza- tion. The HFM-FDD with energy and control modeling extension is designed as generic as possible, and re- quires minimal engineering efforts because of model based software generation techniques. Results using structure and data from a complex HVAC system of a real building are included.
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