Abstract：The air conditioning equipment and sensors in heating, ventilation and air conditioning (HVAC) systems can fail which is one of the main causes of building energy waste and risks to the safe operation of the HVAC system. A fault detection method based on energy balances was developed based on an HVAC energy network model. Energy conservation is then used to detect faults. The method analyzes the energy transfers for the air flows, the waterflows and the measured data in the distribution system in a global correlation across multiple systems. The method can simultaneously detect air conditioning equipment failures, sensor failures, and cross-system failures involving the power distribution. An example shows that the method is simple and easy to implement.
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