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Sustainability 2022, 14, 10125 27 of 39 i.e., the optimizer suggests selling less electricity in order to feed not only more HPs, but also more CCs. Regarding MGTs, as the ECS scenario is not provided with sharing electricity, the optimization found a better solution where two 200 kW MGTs each are placed in building 7 (hospital). However, none of the other scenarios comprise MGTs. One of the reasons for this fact is the higher purchasing price of MGTs, which are between 12% and 43% more expensive if compared with ICEs. Moreover, it is more economically advantageous when using the electricity received from other users rather than installing more CHP components (whether they are ICEs or MGTs). Table 9. Total annual energy magnitudes for electricity, heat, cooling, and fuel of the ECS (without sharing electricity) and SES (with sharing electricity) scenarios, as well as the six scenarios for the sensitive analysis. All values in MWh. ECS SES SE30a SE60a SE30b SE60b SE30c SE60c 15,903.2 16,027.6 13,995.6 13,960.6 12,993.7 12,715.8 12,577.2 12,695.7 MGT 1431.9 0 0 0 0 0 0 0 Produced electricity ICE PV Electricity bought Total electricity IN Required electricity CC HP Electricity sold Total electricity OUT Electricity demand BOI HP STp Required heat ABS Wasted heat Heat demand Produced cooling CC ABS HP Wasted cooling Cooling demand 435.6 231.5 18,002.2 35.5 631.0 5622.5 6289.0 11,713.2 421.2 35.6 16,484.4 50.7 916.5 3804.0 4771.2 11,713.2 0 15.1 14,010.8 46.2 2124.5 126.9 2297.6 11,713.2 0 34.4 13,995.0 57.9 2224.0 0 2281.8 11,713.2 1108.0 56.4 14,158.1 50.3 2039.2 355.4 2444.9 11,713.2 1122.8 53.7 13,892.3 49.9 2066.3 62.9 2179.1 11,713.2 1153.1 135.4 13,865.6 67.0 2012.0 73.4 2152.4 11,713.2 1153.1 48.1 13,896.8 48.7 2134.1 0.9 2183.7 11,713.2 Produced heat ICE 23,913.9 MGT 1598.8 0 0 0 0 0 0 0 Required fuel ICE 43,855.2 267.2 112.6 169.7 98.7 135.8 537.8 77.6 The installed capacity of BOIs is defined so that it can cover the heat gap (between heat produced by other components and the heat demand) when it is economically viable. In order to have an idea, BOIs cover the total heat demand in the CS scenario. For this one, the installed capacity of BOIs was 9460 kW (Table 4) while the average between all the other scenarios is around 360 kW (Table 9). Comparing the reference scenarios (ECS and SES) and the six sensitive ones (Figure 12), the installed capacity of BOIs varies up to an increment of about 55%. However, by analysing the amount of heat produced by BOIs (Table 9), it is possible to see that, for the same comparison, the heat produced decreases in the range of 37–70%, except for scenario SE30c, where the optimal size of the ICEs is the minimum. 187.1 895.9 16,038.1 2159.1 6950.1 31,998.9 106.5 1512.6 857.6 17.8 2446.1 253.9 1670.3 18,461.6 2333.2 8443.3 31,998.9 152.1 1631.6 677.0 6.0 2446.1 107.0 4548.2 24,319.9 2408.0 13,795.5 31,998.9 138.5 1685.9 631.7 7.3 2446.1 161.3 4632.1 24,358.9 2049.0 14,198.5 31,998.9 173.6 1435.1 846.8 8.3 2446.1 93.8 4339.3 27,569.2 2359.8 15,039.2 31,998.9 150.8 1651.9 656.3 9.1 2446.1 129.0 4490.5 28,612.5 2548.2 15,627.0 31,998.9 149.7 1784.2 521.0 8.0 2446.1 510.9 4322.3 29,458.0 2400.4 16,393.8 31,998.9 200.9 1678.6 589.8 14.8 2446.1 23,859.2 21,018.8 20,789.3 19,221.7 18,880.0 18,562.0 18,877.8 73.8 4545.2 28,778.3 2367.0 15,965.1 31,998.9 146.0 1655.2 672.3 18.5 2446.1 43,823.4 MGT 4348.5 0 0 0 0 0 0 0 BOI 196.9 38,518.0 38,229.6 35,421.6 34,731.5 34,236.8 34,706.0PDF Image | Optimal Sharing Electricity and Thermal Energy
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