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NC+O&M+FEN E LEC= n n n/ n O&Mn and FEn stand for operation and maintenance costs and fuel energy costs for year n, respectively. It should be noted that in case of waste heat recovery, the energy is free and therefore there is no cost for fuel. En represents the energy production of year n. 7.6.3 Economic evaluation Typical steps of an economic evaluation of a project as described below will be followed for the evaluation of the small scale ORC-WHR. These steps are (Biezma and Christobal, 2006): 1. Project/system definition. 2. Choice of the economic lifetime of the system. 3. Estimation of the cash flow profile for the project. 4. Specify the cost of capital, k, and other inflation rates, j. 5. Economic assessment through investment criteria. 6. Acceptance/rejection or study of the economic conditions for the economic n n=0 (1+k) n=1 (1+k) viability of the project. Items Equipments Hermetic scroll expander Evaporator Condenser Fluid pump Working fluid Piping system Liquid reservoir Water pump Control system Misc. hardware Total Equipment cost (TEC) Labor cost (10% TEC) Total installed cost (TIC) Specific installed cost Annual cost Operation and Maint. (5% TIC) Insurance (0.3% TIC) Total annual cost n (7.11) Table 7.4 - System cost data Cost (€) (%) 2,300 19.91 2,700 23.38 2,700 23.38 900 7.79 400 3.46 200 1.73 200 1.73 300 2.60 500 4.33 300 2.60 10,500 90.91 1,050 9.09 11,550 100 5,775 - 577.50 - 34.65 - 612.15 - Page | 175PDF Image | Low-Grade Heat Conversion into Power Using Small Scale Organic Rankine Cycles
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