According to the simulation result as shown in Figure , we can collect one input-output data point as shown in Table . Obviously, this data point has much less information than a dynamic simulation result in Dymola, but this data point has contained the essential features for the PSA system regarding the operating condition and the corresponding process output. A sufficient number of such effective data points can be used to train a surrogate for the PSA process. Table . An example of one input-output data point for PSA surrogate.