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Energies 2022, 15, 6398 20 of 23 missing 5759 kW, give a value of 14,374.5 kW. Adding the de-icing heat demand of 555 kW gives a value of 14,909.5 kW, which is in line with the demand (as shown in Table 2). Table 6. Characteristics of the equipment selected. Name of Heat Receiver acc. to Figure 7 ORC Surplus/buffer I stage II stage III stage IV stage Supplementing water in the pool V stage VI stage TOTAL Heat Load Capacity (kW) 1864.8 Heat Receiver Capacity, kW 1864.8 5759 2015 468 1844 3700 276.5 312 3688 18,062.5 Description of the Receiver Heat from the ORC to maintain the water temperature in pool B15 (13–15 ◦C) Use of a buffer (thermal energy store) to stabilize operation during peak times of the district heating section Central heating 329 kW (existing facilities) and ventilation 1686 kW (existing facilities) DHW—II stage 288 kW (existing facilities), DHW—II stage 180 kW (new facilities) Central heating 256 kW (new facilities) and ventilation 1588 kW (new facilities) Pool technology up to 8392 kW (existing facilities), pool technology up to 1067 kW (new facilities). Water discharge at 35 ◦C and flow rate of 1.44 kg/s for supplementing swimming pools DHW—I stage 192 kW (existing facilities) DHW—I stage 120 kW (new facilities) Reheating of other streams, pool water control, pool water exchange, car park heating, pool temperature maintenance of B15 Table 7. Heat flux balance for the proposed process line and comparison with demand. Total Demand (kW) 18,062.5 Heat Load Used at Nominal Conditions (kW) 12,303.5 Heat Load Withdrawn from Source, Including ORC (kW) 14,168.3 Demand from Receivers with Temperature > 30 ◦C (kW) 14,374.5 4.7. Environmental Indicators of the Proposed Solution The ecological indicators were calculated from the value of the energy withdrawn as heat for further use. For this reason, the balance takes into account the value of the heat extracted in the evaporator of the ORC circuit (and not the electrical power generated in this circuit). Also included in the balance sheet are: I, II, III, IV, and V heating stages and the pool water make-up. In the case of heating stage VI, which has a temperature of less than 30 ◦C, only the car park heating data, i.e., 555 kW, was taken into account for the calculation of the index value. Obviously, with a larger heat outlet, at such a low temperature (<30 ◦C), the installed capacity could be higher (max 3672 kW), as shown in the diagram. Nevertheless, a safe variant, i.e., 555 kW, has been adopted as the indicator value at this point. Considering the above, the indicator value consists of the following values from the scheme: 1864.8kW+2015kW+468kW+1844kW+3700kW+256.9kW+312kW+555kW(relating to the heating of the car park, with a safe value assumed) = 11,015.7 kW, i.e., 11 MW. The indicator value does not take into account the value of 5759 kW, which can be provided if the surplus is stored. The value of the second indicator relates to the production of thermal energy in relation to the newly created infrastructure, as this is an indicator of the increase in energy production from renewable sources. Therefore, in this case, only the newly built part of ChT (the leisure and recreation building) has been taken into account. This indicator is presented in Table 8.PDF Image | Combined Renewable Energy Resources System Geothermal
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