PhD Thesis - Energy Systems Research Unit - University of Strathclyde

It is assumed that the three farm vehicles operate for 8 hours per day from
February to mid July, and 15 hours per day from mid July to mid October [5],
and the 4x4 vehicles are assumed to travel 40 km per day, mostly between 9am
and 5pm, all year round. The energy required for grain drying is assumed to be
72500 kWh each year, required throughout each day during the harvest period
(mid July to mid October) [6].
Figure 8.1 represents the estimated yearly electricity demand profile for this
island, showing a large increase in consumption during the tourist season (1 st
April – 20 th October). Figure 8.2 shows the yearly heat demand profile.
Increased heat demand during the tourist season, and the requirement for crop
drying during the harvest period make this profile more level than would
otherwise be the case. As the heat demand is substantial throughout most of the
year, the use of combined heat and power (CHP) should be considered. There is
a reasonable base load that can be met by CHP, but the lack of correlation
between the electricity and heat demand profiles means that the use of CHP on
its own will lead to large losses if suitable storage and/or other electricity and
heat supplies are not used.
Figure 8.1: Overall Yearly Electricity Demand Profile
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