Abstract
The main challenge for designing a tri-generation system is to fully cover the heating and cooling demand in district heating networks. In this work, a new flexible tri-generation system driven by geothermal brine is proposed and analysed from a thermo-economic point of view. The proposed system covers the demand of a specific district network according to the climate conditions in Germany. The tri-generation system includes the domestic heat exchanger, the Kalina cycle, and the absorption refrigeration cycle to produce heating, electricity, and cooling. The working fluid of the system is an NH3H2O mixture. The off-design calculation is applied to the design of the heat exchangers as well as to perform annual calculation. The sensitive analysis is studied to evaluate the influence of operational parameters on the system performances. The results show that the ambient temperature and geothermal mass flow division ratio play an indispensable role in the system performance. The mean annual exergy efficiency and levelized cost of electricity are calculated as 46.23% and 0.2245 $/kWh, respectively. An interest rate of less than 5% and the heating mean price greater than 0.15 $/kWh result in an LCOE of less than 0.15 $/kWh.
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