Discussion
Put the steps of establishing a plant's energy performance in order.
1. Regress consumption against output 2. Collect twelve months of consumption and production data 3. Track the residuals cumulatively 4. Separate the fixed and variable components
Answer: A
Correct answer: 2, 1, 4, 3
The data must exist before anything can be regressed, and the regression is what separates the fixed from the variable component. Only then is there an expected consumption against which residuals can be computed, and tracking those cumulatively is the last step - and the one that reveals when performance changed.
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