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7.7.3 Cycle cost model In the previous section (7.7.2) it was seen that different components have different cost variations depending upon the working condition. This section aims at summing all components costs to build the total investment cost (TIC) and the specific investment cost (SIC). The TIC is the sum of various costs: Scroll expander, Evaporator, Condenser, Fluid pump, Pipes, Working fluid charge, Other equipment: water cooling pump (300 €), liquid reservoir (200 €), control system (500 €) and miscellaneous hardware (300 €) for which the costs are neither dependant of fluids nor its thermodynamic state. An assumption is made on the labor cost: 10% of the total equipment cost. i The total investment cost is thus given as: n TIC= C i=1 (7.19) (7.20) The specific system investment cost (SIC) can be deducted: . SIC=TIC/ Wnet On Figure 7.15, the evolution and weight of different components on the TIC are shown for R123. As can be seen, the most expensive components are the expander and the heat exchangers. The share of the expander compared to the total cost is particularly important at pressures below 11 bar, then decreases while the share of heat exchangers increases. This is due to the decrease of heat exchangers cost in narrow ranges. The influence of the working fluids and pipes are almost negligible. The system overall cost i.e. the sum of costs of different components of the Organic Rankine Cycle system decreases as the evaporating pressure increases. Page | 182PDF Image | Low-Grade Heat Conversion into Power Using Small Scale Organic Rankine Cycles
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