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<br />Table 12 <br /> <br />BASIS.OF CALCULATION OF VAPOR COMPRESSION-- <br />VERTICAL TUBE EVAPORATOR--MULTISTAGE FLASH DISTILLATION PROCESS <br /> <br />.... <br />CJ:) <br />-l <br />~ <br /> <br />General Fact ors <br /> <br />Plant size, fresh water production <br />Plant capacity factor <br />Feed wa ter <br />Scale control <br /> <br />8 mgd <br />90% or 330 d/ yr <br />Seawater, 3.5% 1OS, 750F <br />Concentration-t.emperature limit for sulfate <br />control. Sulfuric acid carbonate control, <br />120 ppm of feed water <br />Slug chlorination <br /> <br />Algae control <br /> <br />. <br /> <br />Evaporator factors <br /> <br />Number of VTE effects <br />Number 0f MSF stages <br />Fuel cost <br />Maximum brine temperature <br />Concentration factor <br />Performance ratlo <br /> <br />4 <br />24 <br />23</106 Beu <br />2500 F <br />2.26 <br />19 lb product water/l03 Btu total heat input <br /> <br />Overall Ueat Transfer Goefficient <br /> <br />MSF + VTE prehe:aters <br />VTE <br />VTE tubes <br /> <br />560 <br /> <br />1460 <br /> <br />0.0312 ft2/gpd, double fluted, 90/10 CuNi, <br />3 in 00-20 g X 12.5 ft <br /> <br />0,00225 ft2/gpd, smooth 90/10 CuNi, <br />7/8 in 00- 20g X 18 ft <br /> <br />0.0112 ft2/gpd, smooth, 90/10 CuNi, <br />5/8 in 00- 20g X 55 ft <br /> <br />WE preheat tubes <br /> <br />MSF tubes <br /> <br />Tube costs $/ft2 <br /> <br />VfE, MSF preheaters <br />VTE (double fluted) <br /> <br />3.00 <br />3.75 <br /> <br />Vapor compressor inlet temperature <br /> <br />2250F <br /> <br />Total heat input Btu/kgal <br /> <br />18,000 <br /> <br />Heat to steam Btu/kgal <br /> <br />7,312 <br /> <br />Heat to shaft power Btu/kgal <br /> <br />4,650 <br /> <br />Vapor compressor pressure ratio <br /> <br />1. 75 <br /> <br />Vapor compressor inlet vol. (8 mgd) <br /> <br />208,000 cfm atm. <br /> <br />6T per VTE effect, <br /> <br />6-70F <br /> <br />45 <br /> <br />.i,; , <br /> <br />