There are numerous methods for evaluating process energy efficiency. They involve representations of the process system to varying degrees of complexity in the search for lost Btus. Many of these methods often try to maximize heat recovery for a single process while ignoring effects in downstream units. Thus, decreased energy use in one unit may result in increased energy use in another. Several other methods attempt detailed studies to find savings without first establishing a target energy consumption against which to measure progress. A method exists which can be used to easily establish targets and compare current operation to these targets. Process units do not need to be considered in isolation and effects of heat recovery on subsequent units can be accounted for. Included in this method is a systematic analysis which allows quick identification of specific areas where energy efficiency improvements are most likely to be realized. This results in subsequent evaluations being focussed on items with the highest heat recovery potential.
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