## 4 Conclusions  
In this study, a novel directly combined Organic Rankine Cycle and a dual-evaporator vapor compression refrigeration cycle system (ORC-VCC) has been analyzed. The working fluids considered have been R290, R600a, R601 and R1234 ze(E). Various parameters, including heat source temperature, heat source mass flow rate, cooling capacities, condenser temperature, ORC evaporator temperature, pinch point temperature difference and isentropic efficiencies, have been examined for their effect on net power produced by the proposed novel cycle. The results are given in comparison to a reference cycle. Based on the results within the research range of this study for the proposed novel ORC-VCC, the following conclusions can be drawn:  
* Higher geothermal heat source temperature and higher mass flow rate increase net power produced by proposed novel cycle. * Cooling capacities, condenser temperature, and pinch point temperature difference should be minimized to achieve higher net power. * At 110 \({}^{\circ}\)C heat source temperature; the optimum ORC evaporator temperature which maximizes net power is 70 \({}^{\circ}\)C for all working fluids. At 155 \({}^{\circ}\)C heat source temperature; the optimum ORC evaporator temperatures are 100 \({}^{\circ}\)C for R600a and 95 \({}^{\circ}\)C for R601. * R290 provides the highest net power production but the critical point temperature of the fluids limits the operating range. * R290 cannot be used at condenser temperatures higher than 30 \({}^{\circ}\)C due to the temperature difference between the refrigerant inlet and heat source outlet at ORC evaporator becomes lower than the determined pinch point temperature difference of 5 \({}^{\circ}\)C.
* When the heat source temperature is 155 \({}^{\circ}\)C, R290 and R1234 ze(E) cannot be used at higher ORC evaporator temperatures than 65 \({}^{\circ}\)C and 100 \({}^{\circ}\)C, respectively, since the temperature difference between the inlet of the refrigerant and the outlet of the geothermal heat source at the ORC evaporator drops below the defined pinch point limit of 5 \({}^{\circ}\)C.
* Over the reference cycle, the proposed novel cycle's improvement of net power becomes more significant at: \(\bigcirc\) Lower geothermal heat source temperatures (\(\dot{W}_{net,i}\) from 8.7% to 57.8%). \(\bigcirc\) Lower geothermal heat source mass flow rates (\(\dot{W}_{net,i}\) from 4.0% to 50.8%). Higher LT evaporator cooling capacities (\(\dot{W}_{net,i}\) from 8.5% to 10.7%). Higher MT evaporator cooling capacities (\(\dot{W}_{net,i}\) from 4.3% to 26.8%). Higher condenser temperatures (\(\dot{W}_{net,i}\) from 9.2% to 44.7%). Higher pinch point temperature differences (\(\dot{W}_{net,i}\) from 9.2% to 11.9%). Lower compressor isentropic efficiencies (\(\dot{W}_{net,i}\) from 6.6% to 11.2%). Lower turbine isentropic efficiencies (\(\dot{W}_{net,i}\) from 6.8% to 12.4%). \(\bigcirc\) Lower pump isentropic efficiencies (\(\dot{W}_{net,i}\) from 9.0% to 10.3%). * The proposed novel cycle includes additional components, one more compressor and a heat exchanger, resulting in higher initial investment and installation costs compared to the reference system. Compressor costs are estimated to be approximately 8% higher than reference system, while the added heat exchanger is expected to account for around 1% of the total investment. Despite these increased investment expenses, the enhanced energy production capability of the novel cycle offers the potential for long-term economic benefits. Therefore, a comprehensive economic analysis is recommended as future work to evaluate the overall cost-effectiveness of the proposed configuration. **Author Contributions:** Conceptualization, N.B.S. and M.I. ; methodology, N.B.S. and M.I. ; software, M.I. ; validation, N.B.S. and M.I. ; formal analysis, M.I. ; investigation, N.B.S. and M.I. ; resources, M.I. ; data curation, M.I. ; writing--original draft preparation, N.B.S. and M.I. ; writing--review and editing, N.B.S. ; visualization, M.I. ; supervision, N.B.S. ; project administration, N.B.S.