## 3 Results and Discussion  
### Process Model Results  
#### 3.1.1 GTW Process Simulation Results  
For Field Y, the General Electric (GE) 7F combined natural gas cycle (available in two versions 7F.04 and 7F.05) having a power ranging from 305 MW to 769 MW depending  
\begin{table}
\begin{tabular}{c c} \hline
**Item** & **Formula** \\ \hline Fixed Capital Investment (FCI) & FCI Onshore = (5.04 \(\times\) EC) + CCT \\ FCI Offshore = (5.14 \(\times\) EC) + CCT \\ Total Capital Investment (TCI) & TCI = FCI + VVC \\ Depreciation (D) & D = (0.1 \(\times\) FCI) + 0.2 \(\times\) (0.18 \(\times\) EC); \\ Operating Labour Cost (OLC) & OLC = Employee per shift (E) \(\times\) Number of shift (S) \(\times\) salary per year \\ Operating Cost of Transport (OCT) & OCT = CCT \(\times\) 0.03; \\ Direct Production Cost (DPC) & DPC = RC + OLC + U + (0.45 \(\times\) OLC) + (0.07 \(\times\) FCI) \\ Fixed Charges (FC) & FC = 0.31 \(\times\) FCI \\ Manufacturing Cost (MC) & MC = DPC + FC \\ Total Product Cost (TPC) & TPC = MC + (0.9 \(\times\) OLC) \\ Product Cost for Plant (PCP) & PCP = TPC + PC \\ Total Yearly Income (TYI) & TYI = Plant Capacity (PC) \(\times\) Plant Cost of Sale (PCS) \\ Gross Profit (GP) & GP = TYI \(-\) MC \\ Net Profit (NP) & NP = Gross Profit (GP) \(\times\) [1 \(-\) Income Tax Rate (20\%)] = 0.8 \(\times\) GP \\ Cashflow (CF) & CF = Net Profit (NP) + Depreciation (D) \\ Rate of Return on Investment (ROR) & ROR = Net Cashflow (CF) \(\times\) Capital Investment \(\times\) 100\% \\ Payback Period (PBP) & PBP = Capital Investment \(\div\) Net Cashflow (CF) \\ Working Capital (WC) & WC = 0.89 \(\times\) EC + OCT \\ Capital Recovery Factor (CRF) & CRF = rate \(\div\) (1 \(-\) (1 \(+\) rate) \(\div\)-period) \\ Total Annualised Cost (TAC) & TAC = (CRF \(\times\) TCI) + TPC \\ \hline \end{tabular}
\end{table}
Table 6: Calculating and evaluating economic statements.  
on the plant arrangement and the version was selected. The GE 7F was selected because it provides low electricity costs (cost-effective fuel conversion to electricity) and high combined cycle performance (usually greater than 50%), as well as industry-leading 99.3% reliability, and ensures asset availability [33]. This F-class type also ensures low air pollution (of about 5 ppm NOx emissions) [33]. For Field X, the Mitsubishi H-100 series gas turbine combined natural gas cycle (available in 50 Hz) having a power ranging from 150 MW to 350 MW, depending on the plant arrangement, was selected because it has a heavy and highly reliable structure designed to ease maintenance and long-term continuous operation. The Mitsubishi H-100 series guarantees high combined cycle efficiency (usually greater than 50%) and possesses a package type that is easy to carry and install [34]. The H-100 series possess a leading air quality control system that ensures low air emissions (NO\({}_{\text{\tiny{X}}}\), CO\({}_{\text{\tiny{2}}}\)) [34]. The net power outputs for the plants in Fields Y and X are 467 MW and 299 MW, respectively, as shown in Table 7. The average net plant efficiencies (which is equal to the ratio of net power to thermal input multiplied by 100%) for both NGCC plants of Fields Y and X are greater than 50%. The scale factor (0.82 for both Fields Y and X) and load factor (0.60 or 60% for Field Y and 0.85 for Field X) are less than 1. Table 7 shows the overall NGCC plant performance of Fields Y and X.