NESC0831 RO-75.

1. NAME OR DESIGNATION OF PROGRAM:  RO75.

3. DESCRIPTION OF PROBLEM OR FUNCTION

RO75 is a program for the optimization of the design and economics of one- or two-stage seawater reverse osmosis plants.

4. METHOD OF SOLUTION

RO75 evaluates the performance of the applied membrane module (productivity and salt rejection) at assumed operating conditions. These conditions include the site parameters - seawater salinity and temperature, the membrane moduleoperating parameters - pressure and product recovery, and the membrane module  predicted long-term performance parameters - lifetime and long flux  decline. RO75 calculates the number of first and second stage (if applied) membrance modules needed to obtain the required product capacity and quality and evaluates the required pumping units and the power recovery turbine (if applied).

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The program does not optimize or design the membrane properties and the internal structure and flow characteristics of the membrane modules; it assumes operating characteristics defined by the membrane manufacturers.

6. TYPICAL RUNNING TIME

1.5 CPU seconds on an IBM360/91 for an optimized case 0.06 CPU seconds for an unoptimized case. NESC executed the sample problems in 5 CPU seconds on an IBM3033.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS

MSF21 and VTE21 (NESC Abstract 798) perform design and costing calculations for multistage flash evaporator and multieffect vertical tube evaporator desalination plants.

10. REFERENCES

- P. Gluckstern, S.A. Reed, and J.V. Wilson,
  RO-75: A FORTRAN code for Calculation and Design Optimization of
  Reverse Osmosis Seawater Desalination Plants,
  ORNL/TM-5229, November 1976, revised October 1979.
- P. Gluckstern, J.V. Wilson, and S.A. Reed,
  Design and Cost Modifications of ORNL's Computer Programs MSF-21
and VTE-21 for the Evaluation and Rapid Optimization of Multistage    Flash and Vertical Tube Evaporators,
  ORNL/TM-5230 and Errata, June 1976.
- RO75, NESC No. 831.360, Errata to ORNL/TM-5229, NESC Note 80-14,
  December 13, 1979.

11. MACHINE REQUIREMENTS:  150K bytes of memory are needed for execution.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  OS/360.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

Dummy IDAY and ICLOCK routines are provided. These date and time routines return the current date and elapsed CPU time in the local computing environment, and may be replaced with suitable alternative environment routines.

15. NAME AND ESTABLISHMENT OF AUTHOR

             P. Glueckstern, S.A. Reed*, and J.V. Wilson
             Oak Ridge National Laboratory
             P.O. Box X
             Oak Ridge, Tennessee 37830
* Contact

source program   mag tape                                           SRCTP
test-case data   mag tape                                           DATTP
test-case output mag tape                                           OUTTP
report                                                              REPPT