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Heat flow model for building fault detection and diagnosis

  • US 8,606,554 B2
  • Filed: 10/18/2010
  • Issued: 12/10/2013
  • Est. Priority Date: 10/19/2009
  • Status: Active Grant
First Claim
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1. A method of using a Heat Flow Model (HFM) graph for detecting HVAC system faults for a building comprising:

  • translating formal HVAC system descriptions from a Building Information Model (BIM) for the building as HFM nodes;

    retrieving HVAC component attributes from the BIM for each HFM node;

    retrieving predefined HFM nodes from an HFM node library that correspond to the BIM for each HVAC equipment type respectively;

    creating connectivity among the retrieved HFM nodes from BIM connectivity data;

    compiling the HFM nodes into an HFM graph;

    inputting real-time data from the building HVAC control system to the HFM graph for fault detection;

    detecting building HVAC system faults using node rules which are conditioned inequalities based on node specific configuration data that defines the functionality of a physical HVAC component; and

    mapping rule violations from the HFM nodes to the building HVAC control system failures.

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