PhD Thesis - Energy Systems Research Unit - University of Strathclyde

Having discussed the effect that changes in demand have on the present worth of aproject, Figure 5.14 shows the effect the different plant configurations used to modelScenarios 3 High (additional chilled water tank) and 4 High (additional SWH) have on thePW of the project. For comparative purposes, also shown are the PW plots for thecurrent and high electrical efficiency scenarios of the 6 household building with highefficiency fabric (Scenario 2 High/Current efficiency and Scenario 2 High/High efficiency ). Thenegligible difference in PW between the different scenarios suggests that that at theseconditions (and for the selected financial parameters) the physical modificationseffected in the plant configuration do not substantially affect the financialperformance of the system. In real terms this means that, for the given conditions andthe level of physical modifications effected, the financial aspect is not an importantconsideration when selecting the type of plant configuration.Multiple of current electricity tariffFig. 5.14 - PW for scenarios with different plant configurations for varyingelectricity tariffsFinally, whereas changing the plant configuration has no effect on the financialperformance of the system, comparing the PW plots of the scenarios in Scenario 5 Highwith the corresponding ones in Scenario 2 High shows that the way the cogeneratedelectricity is used substantially alters the PW of a project. In Figure 5.15 the currentand high efficiency scenarios of both Scenario groups 2 High and 5 High are shown.215