last modified: 06-APR-2001 | catalog | categories | new | search |

ESTS0648 HTRATE.

HTRATE, Power Plant Heat Rate Improvement from Condenser Retubing

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1. NAME OR DESIGNATION OF PROGRAM:  HTRATE.
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2. COMPUTERS
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Program name Package id Status Status date
HTRATE ESTS0648/01 Arrived 06-APR-2001

Machines used:

Package ID Orig. computer Test computer
ESTS0648/01 IBM PC
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3. DESCRIPTION OF PROGRAM OR FUNCTION

A utility will only retube a
condenser with enhanced tubes if the incremental cost of the enhanced tubes can be offset with reduced fuel costs. The reduced fuel cost is obtained for some units because of the higher heat-transfer coefficient of enhanced tubes. They lead to improved condenser performance measured by a lower condenser pressure and therefore a more efficient power plant. However, the higher heat-transfer coefficients do not always guarantee that enhanced tubes will be more cost effective. Other issues must be considered such as the cooling-water flow reduction due to the increased pressure drop, the low-pressure turbine heat-rate variation with backpressure, and the cooling-water pump and system characteristics. These and other parameters must be considered to calculate the efficiency improvement of the power plant as commonly measured by the quantity known as the heat rate. Knowing the heat-rate improvement, the fuel cost, and the incremental increase of the enhanced tubes from the supplier, the payback time can be determined. This program calculates the heat-rate improvement that can be obtained by retubing a power plant condenser with enhanced tubes of a particular type called Korodense LPD made by Wolverine Tube, Inc. The fuel savings are easily established knowing the heat-rate improvement. All electrical utilities are potential users  because a condenser is used as the heat sink for every power plant.
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4. METHOD OF SOLUTION:
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The program is restricted to just one enhanced tube type called Korodense LPD made  by Wolverine Tube, Inc., and all program options have not been thoroughly tested.
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6. TYPICAL RUNNING TIME:  About 10 seconds on 386 type machine.
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7. UNUSUAL FEATURES OF THE PROGRAM

Interactive or file input; single  or two-pass condenser designs; evaluation on a monthly basis; based  on the Heat-Exchange Institute calculation methods; can input known  fouling characteristics.
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8. RELATED AND AUXILIARY PROGRAMS

SUBS.FOR file that contains all the subroutines: fluid properties, HEI material and gauge factors, temperature corrections, etc. INPUT.FOR interactive input file. IPBUG.FOR input file subroutine (file VALUES). OPUT.FOR output file  subroutine (file RESULTS).
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9. STATUS
Package ID Status date Status
ESTS0648/01 06-APR-2001 Masterfiled Arrived
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10. REFERENCES:
ESTS0648/01, included references:
- T. Rabas et al.:
  Heat-Rate Improvements Obtained with the Use of Enhanced Tubes
  in Surface Condensers
  (1990 EPRI Conference)
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11. MACHINE REQUIREMENTS:  PC computer.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
ESTS0648/01 FORTRAN-77
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  MS-DOS.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

A file  called RESULT is used to store dumped data for each run. This file can be examined if the program crashes to determine the source of the problem. The WRITE (6,100) in the source code, HTRATE.FOR is used to write to this file. A file called VALUES is used for data input if the interactive mode is not selected. A sample input form is attached with the program documentation.
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15. NAME AND ESTABLISHMENT OF AUTHORS

   T.J. Rabas
   Argonne National Lab., IL (United States)
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16. MATERIAL AVAILABLE
ESTS0648/01
source program   mag tapeHTRATE.FOR Source file                     SRCTP
load module      mag tapeHTRATE.EXE Executable file                 LODTP
source program   mag tapeINPUT.FOR Interactive input file           SRCTP
source program   mag tapeIPBUG.FOR Input file subroutine (VALUES)   SRCTP
source program   mag tapeOPUT.FOR Output file subroutine (RESULTS)  SRCTP
test-case output mag tapeRESULT File to store dumped data           OUTTP
test-case output mag tapeRESULTS Output file                        OUTTP
test-case data   mag tapeVALUES Data input file                     DATTP
source program   mag tapeSUBS.FOR Contains all the subroutines      SRCTP
object program   mag tapeHTRATE.OBJ Object program                  OBJTP
object program   mag tapeSUBS.OBJ Object program                    OBJTP
object program   mag tapeIPBUG.OBJ Object program                   OBJTP
object program   mag tapeINPUT.OBJ Object program                   OBJTP
object program   mag tapeOPUT.OBJ Object program                    OBJTP
report                   Heat-Rate Improvements... (1990)           REPPT
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17. CATEGORIES
  • H. Heat Transfer and Fluid Flow

Keywords: condensers, heat transfer, life-cycle cost, operating cost, power plants, tubes.