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Electricity generation will come from three sources: a 219.5 kW ORC plant generator Energies 2022, 15, 6398 turbine, a 46.5 kW hydro turbine, and a 693 kWp photovoltaic installation. The electricity demand of the existing facility will be partly covered by RES (Figure 4). Calculations of the demand and energy coverage from RES were made using 15-minute data from 2018–2019 and computer modeling of PV production, with shadow analysis for unit with a water turbine were made on the basis of the actual heat demand for 2018. Figure 4. Current share of RES in terms of electricity consumption at the existing ChT facility.. Due to the nature of the heat source, which comes from the extraction of geothermal water at a temperature of 88 ◦C, the development of a concept for utilizing this heat requires that attention be paid not only to the need for thermal power but also—and above all—to the temperature range of the individual receivers. It should be noted that the total available thermal output of a geothermal source, calculated as the product of the water mass flow (a maximum of 160 t/h is assumed), the specific heat of the water, and the temperature difference (between the geothermal water temperature of 88 ◦C and the ambient temperature of 0 ◦C) can be presented as: Pgeoterm =44.4kg·4.19 kJ ·(88◦C−0◦C)=16,317kW. (1) s kgK This will not be sufficient to cover the demand at the previously mentioned value if the heat receivers need to be supplied with a medium at a temperature of, e.g., 60 ◦C. In this case, the recoverable heat output will be: Pgeoterm = 44.4kg·4.19 kJ ·(88 ◦C − 60 ◦C) = 5209 kW. (2) s kgK In the case of heat circuits in which the medium with the lowest parameters has a temperature of 30 ◦C, the maximum available thermal power from the geothermal source the location of the parking shelter installation. Simulations of the operation of the ORC 10 of 23 will be: Pgeoterm =44.4kg·4.19 kJ ·(88◦C−30◦C)=10,790kW. (3) s kgK For this reason, in addition to the quantity of available heat, the quality of the heat (tem- perature) was also taken into account for this concept and was the available temperature that was taken into account in the planning phase. On the basis of an analysis of the thermal (as well as cooling and electrical) power requirements of the existing facilities, the supply temperatures of the individual heat re- ceivers, and the planned investments and changes to the facility’s energy installations, a concept for a cascade heat exchanger system was devised, taking into account the required outlet temperatures of the circulating medium (28–36 ◦C for swimming pool systems, 55 ◦C for domestic hot water systems, 60–75 ◦C for central heating and mechanical ventilation). The available heat output and heating medium supply temperatures predispose the system to be equipped with cooling systems (sorption chillers) in the future (for a supply tempera- ture of 65–70 ◦C, among other things, during future expansion or modernization works at the facility, a COP of 0.85–0.90 can be assumed). The following assumptions were made in the presented conceptual solution: - Due to the lack of separation of heat streams between the central heating systems of radiators and underfloor heating, the analyses assumed that the entire power associ-PDF Image | Combined Renewable Energy Resources System Geothermal
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