Results
In running simulations, the inlet temperature of geothermal fluid (GEO_in branch in Fig. 1) is fixed at value 120
°C. Therefore, the evaporation pressure corresponds to value 888 kPa (T=110.2 °C) for the isopentane and 2390 kPa
(T=109.9 °C) for the isobutane. The cooling water temperature at the condenser (WATER_in branch in Fig. 1) is
set at 18 °C for winter season and 27 °C for summer one. Mass flow rate considered in computations for geothermal
fluid (Q GEO) is 110 kg/s for both working fluids. Mass flow rate of working fluid (Q WF) is otherwise 27 kg/s for
the isobutane and 18 kg/s for the isopentane. Simulations are carried-out for working conditions listed in Table 1.
Figures 2-3 report an extract of thermodynamic results (Simulation #3) obtained for both working fluids.
Thermodynamic cycles are plotted in the T-s diagram also.