Complex scenarios

Some industrial processes are such that their levels of activity cannot be measured by the volume throughput of product processed. For example, energy-intensive discontinuous batch processes have energy demands which are dominated by idle and transient operation, not to mention the fact that the product itself may embody very little energy (as is the case with pharmaceuticals) making it nonsensical to consider the energy used per unit of production.

In such circumstances, different kinds of data (specified operating temperatures, batch duration, charge weights, number of starts and stops, etc.) may need to be recorded and fed into a mathematical model to arrive at a theoretical energy requirement given the pattern of production activity. This is another manifestation of an expected-consumption formula (ECF).

The model used as an ECF need not be complex, although indeed it may be so. The only requirement, from an M&T standpoint, is that the model yields a single number representing expected energy demand. Note that there will be a different model for each energy source feeding a monitored process: one for steam, one for electricity, and so on as the case may be.

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