Is the first correlation valid for a long time or should we tune SmartCEM PEMS each year?
The validity of the SmartCEM PEMS model is entirely dependent on the training dataset and the quality assurance program in place at the site. If a comprehensive model is developed initially, there would be no reason to limit the range of time that it would be valid. An initial model that includes all normal operations, startups, shutdowns, and transitional operating states is deemed ‘robust’ and will provide valid predictions for compliance purpose for many years. The model can easily be retrained if required for any extreme ambient or other operating conditions not encountered during the initial training data collection. The system keeps track of when the model is valid for a given set of process data in real-time and provides alarms for tracking excurstions from the established model envelope and records the status of the model prediction automatically. Requirements for a periodic or annual recertification test would be dependent on the local regulatory requirements and the facility
