| Description |
xvi, 78 leaves : illustrations ; 28 cm. |
| Summary |
"The object of this investigation was to study desalination using evaporation through porous membranes and to estimate the economic potential of the method. The major factors affecting the economics were: 1. The saline water temperature into the evaporator, t[subscript sl]; 2. the temperature driving force in the evaporator, DF; 3. the temperature driving force in the heat exchanger, DTEX; and 4. the saline water temperature leaving the evaporator, t[subscript s2]. The optimum conditions based on cost of water product were studied by calculating water costs under a wide range of conditions. for any given set of variables t[subscript sl], DT, and t[subscript s2], the optimum value of DTEX can be found by setting the partial derivative of water cost with respect to DTEX equal to zero. The optimum values of DT and t[subscript s2] are found by using a numerical integration process from the hot end of the evaporator-condenser to the cold end. Computer calculations were used to study process economics under a number of possible conditions. The optimum conditions could be determined by inspection of the computer print out. Calculations were also made to determine the effect of a number of cost factors on the optimum water cost. Under conditions believed to be attainable, the cost of water is estimated to be as low as 0.46 $/1000 gallons using this method of evaporation"--Abstract, leaf ii. |
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