Abstract

A new tool for performing fault detection and diagnostics for variable air volume (VAV) terminal units has been successfully developed and tested. The Model-Independent Fault Detection and Diagnostics tool was developed without the use of a traditional modelbased preprocessor. Instead, the FDD analysis is performed using performance indices that can be evaluated using only design information and measured values. This eliminates the need to “train” the tool for each individual system and should expedite real-world implementation of the tool. Appropriate fault threshold values have been determined through a combination of simulation and laboratory testing. To date, the tool is capable of detecting and diagnosing nearly 40 different failure modes for pressure-independent VAV terminal units. Detection of numerous other failure modes is possible, including simultaneous multiple failure modes, although the tool cannot currently diagnose these cases.

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Panel 1. Residential Buildings: Technologies, Design, and Performance Analysis

Panel 2. Residential Buildings: Program Design, Implementation, and Evaluation

Panel 3. Commercial Buildings: Technologies, Design, and Performance Analysis

Panel 4. Commercial Buildings: Program Design, Implementation, and Evaluation

Panel 5. Deregulation of the Utility Industry and Role of Energy Services Companies (ESCOs)

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Panel 7. Information and Electronic Technologies

Panel 8. Consumer Behavior and Non-Energy Effects

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Panel 10. Building Industry Trends