All potential measures for saving energy and reducing CO2 emissions were documented during the idea generation phase in a list shown as an example in Figure 4.11. Some of them go into the idea evaluation phase after Milestone 2. The task during this phase is to assess the ideas regarding two different dimensions: the technical feasibility and the financial profitability of the ideas. This evaluation eventually leads to a prioritization of the potential measures and an implementation plan, which documents the planned actions for the next years on the plant or the site.
The technical feasibility is a soft or qualitative measure. Nevertheless we try to indicate a mark that describes the feasibility of an idea. This mark which lies between 1 (unfeasible) and 10 (feasible) expresses the result of a discussion between consultant, plant manager or operator and experts in unit operations. There are three general outcomes from this discussion in the project team: an idea can be feasible or not feasible or a further evaluation may be necessary. Some questions discussed in the team are:
• Is there a proven technology to implement the measure?
• Are there any reference cases where the measure was implemented successfully?
• Is the feasibility of the measure supported by appropriate calculations based on a simulation model of the plant?
• Will the operators be able to operate the plant after implementation of the measure?
• Are any additional studies required before the implementation?
• Does the effect of the measure justify the risk of implementation?
• Can offline experiments (for instance in the lab) minimize the risk of implementation?
• Are there any side effects that have to be considered?
Depending on the answers to these questions the team will rank a measure with a feasibility parameter between 1 and 10. This parameter will be used for a graphical comparison of all measures in the savings portfolio (see Section 4.5.3). If we need further investigations to determine the feasibility of a measure, then this will be documented accordingly.
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