## 3 Results and Discussion
The SRC provides power at a unit cost of 0.01592 $/kWh.  
The SRC's condenser generates heat that is meant to be recovered via the CO\({}_{2}\) cycle as cascade heat. The CO\({}_{2}\) is saturated liquid (x = 0) and at CO\({}_{2}\) condenser with an outlet pressure of 10 bar. Values from the literature review were used to get the CO\({}_{2}\) cycle pressure value. Similar to the SRC, the pump work and condenser outlet enthalpy in the CO\({}_{2}\) cycle were used to compute the pump outlet enthalpy. The literature states that the turbine output power was computed using input parameters and the CO\({}_{2}\) cycle TIT. The combined system has a net output power of 429.83 kW. The suggested devices' ability to transfer heat from the FG depends critically on the mass flow rate.  
Mass flow rate in a cycle is an important parameter during designing cycles, as it will directly affect the size and the cost of the components. In addition, since the heat transferred to the working fluid in the evaporator is directly related to the temperature, the relationship between temperature and mass flow gives important ideas about the power that can be obtained from the cycle. Therefore, when Figures 6 and 7 are examined together, it is seen that the curves of the mass flow rate and the heat transferred to the system are compatible with each other.  
Since the quality of the heat depends on the temperature, it is an easier method to work with SRC at high temperatures and to study the mass flow rate parametrically depending on the work output in the SRC to achieve maximum power generation. Thus, the total power generation continued to increase linearly, although the temperature increases in the SRC evaporator decreased the power generation in the ORC and KC as depicted Figure 8. The power generation of the CO\({}_{2}\) cycle increases due to the increase in the amount of heat removed from the SRC. However, the power generation in ORC and KC decreases linearly due to the transfer of heat at high temperatures to the SRC and CO\({}_{2}\) cycle.  
Figure 6: Change in mass flow rate with temperature difference.  
Figure 9 gives the electrical energy cost of the entire system according to the change in SRC inlet temperature. Accordingly, electricity generation cost reaches its minimum value when the temperature change is 221.6 K and then rises again rapidly. Thus, the cost of electricity production at 221.6 K is $0.1972 per kWh. Considering that amount of energy is produced from waste heat, the competitive potential of this value in the market is quite high. For instance household electricity prices in 2023 changed by 0.32 and 0.52 $/kWh across Europe [31].  
Figure 8: Change in net powers obtained with varying temperature difference.  
Figure 7: Heat distribution in the cycles according to the changing temperatures.  
The efficiency of the system determines how much CO\({}_{2}\) is released when fuel is utilized to generate energy. For example, 23.16 tons of CO\({}_{2}\) emissions per day would have been discharged into the atmosphere if electricity from a 30% efficient SRC had been received from a coal power station. Therefore, we also avoid the large quantity of CO\({}_{2}\) emissions discharged into the environment and help to safeguard the climate by transferring waste energy using multiple heat recovery options to other integrated systems.  
Figure 10 shows the PEC distributions within the cycle's total investment cost. Accordingly, PEC values of SRC, CO\({}_{2}\) Cycle, ORC, and KC are observed to be $312,866, $50,971, $189,961, and $140,994 respectively. Here we clearly observe that the maximum expense is SRC, and the minimum one is CO\({}_{2}\) cycle. Figures 9 and 10 together show that the increasing inlet temperature difference in SRC directly affects the cost of SRC and that the cost of electricity production is inversely proportional. Figure 10: PEC distribution of the cycles. Figure 9: Electricity cost according to SRC inlet temperatures.