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3.8 Scenario Analysis A few possible future scenarios which are of interest are analysed. However the profitability as a function of certain economic variables, e.g. the electricity price, is also evaluated but is not seen as a different scenario all together. Aggregating the boiler powers A scenario that is evaluated is the possibility of connecting the ORC evaporator to the HWCs of all three boiler such that the avaialable thermal power for the ORC is increased. To evaluate this scenario, the developed model of S ̈avelundsverket, shown in figure 4.15, is adjusted. The adjusted code is presented in appendix A.13. Reducing the supply and return temperatures The effect of lowering the return och supply temperature is also explored. The key benefit of a decreased supply temperature is a resulting decrease in return temperature and a subsequent increase in the thermal efficiency of the ORC. However, while it is true that reducing the supply temperature decreases the received ∆T of the HXs of the DHS load consumers this should not be a major issue for a minor change in ∆T. Therefore a sub-scenario in which the supply- and return is decreased slightly, by 10°C, is evaluated. A future trend towards very low temperature DHS, named 4th generation, is shown to be plausible [57][58][59]. The lowest possible mean supply and return temperatures for such a scenario is around 50 and 20 °C [58] [59]. However, it is quite uncertain exactly how the temperature would vary over the year. In order to simulate this scenario the return temperature profile is set to be constant throughout the year and the supply temperature is set to vary between 50-65°C; 50°C during the summer and 65°C during the winter. 53PDF Image | Analysis of Organic Rankine Cycles for a Boiler Station
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