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isobaric heat exchange was assumed). For the thermal water intake and discharge, the Energies 2022, 15, 6398 12 of 23 values have been referred, using a temperature of 0 °C. Geothermal water with a temperature of 88 °C and a pressure of 1600 kPa, moving at a rate of 160 m3/h will be drawn from the source. Its potential is 16,436.5 kW of heat when the water is cooled to 0 °C. Assuming that the water injected back into the ground will be 12.8 °C, the maximum heat output to be received from the geothermal water will, therefore, be 16,436.5 kW − 2395.6 kW ≈ 14 MW. FFiiggurree5. TeecchnoolologgicicaallscshcehmemeeofothfethgeogtheeortmhearlmheaaltihnegatpinlagntpalnadntOaRnCdpOowRCerploawnte,rwpitlhanspt,ecwifiitehd spaercaifmieedteprasrfaomr netoemrsinfoarl pnowmeinraolppeorawtieorno.peration. The highest-parameter circuits (70/50 ◦C)—central heating and ventilation—are sup- plied in heating stage I. The geothermal water cools down to 67.2 ◦C, giving off a heat flow of 2015 kW. Domestic hot water (DHW) is then heated in heating stage II. DHW is heated in two stages: first in heating stage V, initially rising to 30 ◦C (312 kW), before being reheated in stage II to the required 60 ◦C (with the remaining 468 kW). This procedure is an example of exergetic rationalization (the quality of the available energy) of the circuit and maximization of the heat output at the set parameters of the individual heating circuits. After heating stage II, the geothermal water is at 64.7 ◦C. Heating stage III feeds the heating and mechanical ventilation circuits in the new buildings (60/40 ◦C), giving off a total of 1844 kW of thermal power and reducing the temperature of the geothermal water to 54.8 ◦C.PDF Image | Combined Renewable Energy Resources System Geothermal
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