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<br /> <br />.... <br /><D <br />en <br />o <br /> <br />Table 9 <br />BASIS OF CALCULATION OF VERTICAL TUBE EVAPORATOR-MSF ProCESS <br /> <br />General Factors <br /> <br />Plant size, fresh water production <br />Plant capacity factor <br />Feed water <br />Scale control method <br /> <br />Evaporator Factors <br /> <br />Steam cost <br />Number of effects VTE <br />Number of stages MSF <br />Maximum brine temperature OF <br />Concentration ratio <br />Performance ratio Ib product/103 Btu <br />Electric power required kwh/kgal <br />WE tubes <br /> <br />\tSF tubes <br /> <br />Tube costa S/ ft2 <br /> <br />VfE <br />MSF <br /> <br />Overall heat transfer coefficien~ <br /> <br />VfE <br />MSF <br /> <br />Financial Factors <br /> <br />Equipment <br />Life <br />y' <br /> <br />Equipment <br />Land and Working Capital <br />Insurance <br /> <br />30 <br />Infini te <br /> <br />0.25% of plant investment <br /> <br />4,63 <br />4,63 <br /> <br />10 and 50 mgd <br />90% or 330 days/yr <br />Seawater, 3,5% TDS~ 650F <br />Slug chlorination, sulfuric acid, <br />120 ppm of makeup water <br /> <br />300/106 Btn <br />15 <br />50 <br />260 <br />2,5 <br />13 <br />4 <br />0,035 ft2~d, double fluted, <br />90/10 CuNI, 3 in 00-18g X 10 ft <br />0,014 ft2/gpd, smooth wall, <br />90/10 CuNi, 0.75 (J[).. 20g X 370 ft <br />10 mgd 50 mgd <br /> <br /> 3,75 3,50 <br /> 3,00 2.75 <br /> Brine Temp, OF <br />100 150 200 250 <br />660 982 1193 1369 <br />470 550 605 650 <br /> <br />Interest <br />% <br /> <br />Sinking <br />Fund <br />Factor <br />% <br />1. 60 <br /> <br />Carry~ng <br />Charge <br />Multiplier <br />% <br />6,23 <br />4,63 <br /> <br />30 <br />