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Each of the heat rejection systems has its own parasitic power requirements, and the results were adjusted to compensate for these requirements. The cost of water is another variable, and for the study was assumed as a middle-of-the- road $200 an acre-foot. Each type of heat sink was then optimized for lowest net present cost taking into account each of the before mentioned factors. COMPARISON Tables 4.2.1A and B summarize the process data and economic data for the optimum design for each of the three heat sink systems. Two water-cooled cases are shown. The first case is the normal case with water discharged into a sewer. The second case includes the cost of zero liquid discharge that has been imposed on some desert plants. D3 1 20 45 2 92 118 138 3 224 149 244 0 4 355 355 0 0 5 73 0 0 6 12,741 12,517 11,441 10,776 7 12,162 11,940 11,197 10,776 8 569 1645 2310 9 Cond. Pinch (oF) Cond. Temp. (oF) Fan Pwr (kW) Circ. Pump (kW) ZLD Power (kW) ∆ Gross Power (kW ) ∆ Net Power (kW) 153 375 1118 1539 10 CASE Water Cool 3 87 0 Gross Power (kW) Net Power (kW) 345 Water Use (gpm) 313 274 0 0 Water Cool, ZL Air Cool Nat Draft Table 4.2.1A. Heat Sink Process Summary CASE 1 2 3 4 5 6 7 8 9 CT/AC Cost (MM$) Pump Cost (MM$) Cond Cost (MM$) ZLD Cost (MM$) Tot. Cost ($MM) Tot. Inst. Cost ($MM) Cost of Power ($MM) Oper. Cost ($MM) Net Heat Sink Cost ($MM) Water Cool 0.450 0.126 0.460 0.000 1.035 2.795 0.611 0.280 3.686 Water Cool, ZLD 0.300 0.126 0.460 1.346 2.233 6.028 1.498 0.400 7.926 Air Cool 1.089 0.000 0.000 0.000 1.089 2.941 4.473 0.000 7.414 Nat Draft 2.852 0.000 0.000 0.000 2.852 7.699 6.156 0.000 13.856 Table 4.2.1B. Heat Sink Cost Comparison The analysis shows that a water-cooled heat sink is the best option for a solar ORC cycle. assuming that there are no unusually stringent water disposal requirements such as the zero liquid discharge. 12PDF Image | Solar Trough Organic Rankine Electricity System (STORES) Stage 1: Power Plant Optimization and Economics
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