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PhD Thesis - Energy Systems Research Unit - University of Strathclyde

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dividing the production rate at each timestep by the number <strong>of</strong> timesteps per<br />

hour.<br />

Figure 4.8 Derived Fuel Supply Selection<br />

When considering the use <strong>of</strong> energy crops or fuel production from energy crops,<br />

the possible production times are <strong>of</strong>ten highly seasonal. If an analysis were to<br />

be carried out for a year, there may be a number <strong>of</strong> months being analysed<br />

before the production can start, which would be without fuel. This, however, is<br />

not likely to be the case in reality, as excess fuel would probably have been<br />

stored from the previous year. In order to obtain realistic results when<br />

considering such seasonally stored supplies, the simulation is run for two<br />

consecutive years with the same demands, allowing any fuel remaining in<br />

storage to be used at the beginning <strong>of</strong> the next year. Using the second <strong>of</strong> these<br />

years gives the required results, and will also allow the user to see if there was<br />

any substantial over or under-production. When looking at this type <strong>of</strong> supply,<br />

the simulation period should not be less than a year.<br />

4.3.2 Multiple Load Following Supplies<br />

The matching procedure has been changed to allow the use <strong>of</strong> multiple load<br />

following supplies, and where more than one supply is chosen, these are applied<br />

in the order in which they are selected. This is important, as the residual<br />

95

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