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Sustainability 2019, 11, 1881 15 of 20 Table 3. Heat transfer and net power output comparison of water-cooled and air-cooled condenser stages 1–4 of WHWRS. Heat transfer rate Q (kW): Evaporator/s (in) Condenser (out) Power (kW): Turbine (out) Pump (in) Compressor (in) Net power for water-cooled system Power consumption for air-cooled condenser Net power for air-cooled system 4. Economic Analysis Stage 1 Stage 2 77,445 187,322 −71,049 −180,953 7625 7625 −1228 −1255 - - 6396 6369 959 2441 5437 3928 Stage 3 233,017 −229,267 7625 −1255 −2618 3751 3093 658 Stage 4 266,012 −254,333 7625 −1255 −6493 −124 3591 −3715 Although a detailed economic analysis is beyond the scope of this work, a simple estimation of the potential cost of the system could be helpful to evaluate its usefulness. An economic model of the ORC system presented by Usman et al. [31] was used to estimate the cost of the WHWRS. In the case of a previous two-stage WHWRS represented by configuration A, applied to a 600 MW coal-fired power plant with condensation temperature of 30 ◦C at 20 ◦C ambient temperature, the component cost of the ORC unit and pumped HPC unit are presented in Tables 4 and 5, respectively. The cost of cooling fans for the air-cooled system is estimated using correlations in [32]. Table 4. Cost of ORC unit. Component Turbine Pump Evaporator Condenser Generator Water-cooled: Cooling tower Total Air-cooled: Cooling fan Total W, Q (kW) 7625 1228 77,445 71,048 7625 71,048 959 Cost ($) 1,946,583 695,155 1,745,552 1,901,733 312,645 2,570,129 9,171,798 197,859 6,799,528 Table 5. Cost of pumped HPC unit. Component Pump Evaporator Condenser Water-cooled: Cooling tower Total Air-cooled: Cooling fan Total W, Q (kW) 27 106,739 106,766 106,766 1482 Cost ($) 85,167 2,220,395 2,508,585 3,860,663 8,674,810 275,435 5,089,581PDF Image | Waste Heat and Water Recovery System Optimization for Flue Gas
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