The following is a list of the known issues with GateCycle software version 5.40 at the time of its release. 1. If you click Register License, you see a "Network_Bad_Reply" CrypKey® error on Microsoft® Windows NT® or Windows® 2000 operating systems. To correct this problem, please see the support topic on this subject. 2. If you upgrade from version 5.3x, you may see a message indicating the crp32dll.dll file is "Read-only," and ask for permission to overwrite it. On some systems, the version 5.40 install may warn of pre-existing read-only files when an older version of GateCycle software is upgraded to version 5.40. Typically the file involved is crp32dll.dll, but some .bin files may also be affected. To work around this issue, tell the setup program to overwrite the existing files when prompted. 3. Installing Microsoft Outlook® overwrites newer ODBC drivers. If you install Microsoft Outlook after GateCycle software has been installed, the ODBC drivers used by the Optimization feature are overwritten by the Outlook installation program, causing SQL errors when you attempt to use the optimization feature. To work around this issue, you must reinstall GateCycle after you install Outlook. Please see the support topic on this subject. 4. Models that previously converged fail to do so in version 5.40. Version 5.40 introduces some new pressure control behavior that is stricter than that of previous versions. This stricter pressure control may cause previously working models not to converge. To work around this issue, check your pressure control configuration. You may need to check the equalize inlet pressures checkbox in some mixers where it was previously unchecked. 5. Fluidized bed and fossil boiler models using "sorbent" go haywire and fail to converge. A bug causes the heat of the sorbent reaction to become very large, which in turn causes the steam production to skyrocket while fuel and air consumption plummet. The only workaround for this problem is not to use sorbent in either icon. 6. Fluidized bed and fossil boiler models using solid fuel give different results. In versions prior to 5.40, the carbon content of the ash was wrong, so the energy balance around the fossil or fluidized bed boiler was wrong. The margin of error was about one percent for default inputs for solid fuels. Version 5.40 fixes this issue, so its results are correct. Models built and run in an earlier version should be rerun. 7. Fluidized bed and fossil boiler models using gaseous fuel may calculate boiler air flow differently. In versions prior to 5.40, the air flow calculation for fluidized bed or fossil boilers burning gaseous fuel with an H-C ratio other than 4.0 was incorrect. Version 5.40 fixes this issue, so its results are correct. Models built and run in an earlier version should be rerun. 8. Makeup block (automatic or otherwise) does not account for auxiliary boiler (AUXBLR icon) blow down flow. Models using the AUXBLR icon with a non-zero blow down flow rate have mass balance problems. To work around this issue, use a link source (linked to AUXBLR blow down) to make up the lost blow down flow. 9. Model diagrams exported to the Windows clipboard using the command WMF Export to Clipboard have graphical problems not seen in previous versions. Streams have odd shadow effects and stream labels appear even if the hide stream labels checkbox is checked. Similarly, diagrams printed when the hide stream labels checkbox is checked are missing lines on the printout. These issues are caused by the new Provision libraries used in version 5.40. To work around these issues, change your flowsheet color to white by clicking Tools, Options, Colors before printing or exporting a model diagram. 10. The version 5.40 PIPE icon has not been tested thoroughly. Use it with caution. The PIPES Reynolds number calculation appears to be off by a factor of 3,600. When in doubt, model pressure drops using the PIPVLV icon as in previous versions. 11. The PIPE icon is not set to run off-design when the "Set all icons to off design" checkbox is checked in the Save As case dialog box. To work around this issue, manually check the "Run Off Design" checkbox for each PIPE icon in each off-design case. 12. Changes made to the duct's off-design pressure drop correlation exponents on the correlation screen are not saved. To work around this issue, use macros or CycleLink™ to adjust the correlation exponents. 13. An SSI handler or floating point exception (access violation) error appears when you try to open a previously working version 5.40 model. The new ProVision libraries used with version 5.40 can cause this behavior in one of two ways. First, the sink stream may go off to infinity, and the model diagram becomes corrupted if you try to zoom in to see it. Second, adding a component data icon (data cross) when certain stream IDs are present can cause this error. Please send models with this problem to ge-enter.support@ps.ge.com and we will repair them for you. 14. Some models generate the following input error: "*** ERROR - CHKPRT: error in code logic: please save model and case and contact GE Enter Software." This error is caused when the new FPT modifier icon is used in a line that has mass flow control (demand flow) signals. There is no need to contact us. Rather, you should manually check that mass flow signals generated downstream of the FPT modifier are satisfied upstream of the FPT modifier icon. 15. CycleLink's right-click (contextual) menus do not work in Microsoft Excel 2000. To work around this issue, use the CycleLink menu instead. 16. When CycleLink is started in Microsoft Excel 2000, it appears to do nothing. As an unsigned Excel add-in, CycleLink is not loaded if Excel 2000 is configured to use high security. To work around this issue, click Tools, Macro, Security and select the Medium Security radio button. See the support topic for more details. 17. Some disk defragmentation programs move GateCycle licensing files, causing a loss of your license. To avoid this problem please visit this page for tips on configuring common disk defragmentation programs for use with GateCycle software. Note: Many laptops run disk defragmentation programs automatically. If you install GateCycle on a laptop, please check for automatically scheduled defragmentation before registering your license. 18. An incorrect unit of measurement appears on the valve screen when you switch the outlet pressure method to fractional pressure drop for the first time. The next time you open this screen, the behavior is correct. This bug has no influence on calculations. 19. When you use the Help button for the first time in any equipment icon data entry screen, a "gcw-help.hlp help file not found" message may appear, and ask you to find the file yourself. If this occurs, click Yes; then navigate to the gcw-help.hlp file in the Help subdirectory of theGateCycle installation directory. After you have located the gcw-help.hlp file, the problem should not reoccur. See the support topic for more details. 20. After version 5.40, installation warnings about new units of measure (UOM) appear. If you install version 5.40 and migrate settings from a previous installation, you see warnings about two new UOM types: squared packing leakage constant and squared flow conductance. They are used in the new Seal and FPT-modifier icons, respectively. Since these are new, GateCycle software initializes them for all your UOM sets. They are initialized to SI units; to change them, select Tools, Unit Sets, Edit. The new UOMs are at the bottom of the screen. 21. OLE objects, such as bitmaps embedded on the flowsheet, cannot be resized. This is a provision issue and is beyond our control. There is no workaround at this time. 22. New models built in version 5.30 that use the vertical HRSG icon set or the vertical evaporator display trigger an illegal operation when opened with version 5.4x. Please send models with this problem to ge-enter.support@ps.ge.com and we will repair them for you. See the support topic for more details. 23. If you originally installed GateCycle software using the version 5.30 CD, you may see a series of DAO errors when you attempt to generate a grid report. This problem is a result of a bad DAO setup program supplied by Microsoft and included on the version 5.30 CD. Visit the support topic for instructions on correcting the problem. 24. Version 5.40 allows you to select different effectiveness NTU relationships in the heat exchanger (HEATX), superheater (SPHT) and economizer (ECON) icons for new configurations that were previously unsupported. If you use the new configurations, entering an off-design area change fraction on the Area Change screen will have no effect. There is no workaround for this issue at this time. You must use the "Cross-Counter-Current, 1 tube row total, Outer flow mixed, Inner only mixed between passes" configuration if you want to apply an area change fraction in any of these icons. 26. Fraction of tubes blocked input in Condenser does not influence the tube velocity of the circulating water correctly. This bug affects the results of models that use an HEI off-design method and a nonzero value for the fraction of tubes blocked input. There is no workaround for this issue at this time. 27. Off-design cases with an air cooled condenser that refers to a design point case in which the ACC has two fans per bay input on the Geometry window will not converge. This is a bug and the only workaround is to use one fan per bay. 28. The second default (combined cycle) curve for degradation does not work if you do not enter any tabular degradation data. To work around this issue, enter a small dummy table for each of the four degradation curves in which you intend to use the second default curve; then select the second default curve. 29. If you upgrade from a previous version of GateCycle, you may see GTDATA input warnings that were not given prior to version 5.40. The following warnings appear when a model with a GTDATA icon using the GT Curve Set method and a pre 5.40 curve set table is run in version 5.40: ** WARNING - GTD1 GTDATA Base Rating Table Fuel LHV - Input Out of Range Version 5.40 includes new correction curves for Fuel LHV and Relative Speed/Frequency. Prior versions did not have these corrections, so GT curve set tables from prior versions have 0.00 as the rating values for these quantities. To prevent the warning, edit the curve set's rating point. Default rating point values are 21,500 Btu/lb for LHV and 1.0 for Relative Speed/Frequency. 30. Generator losses (System and GENRTR icons) are calculated incorrectly if the model contains a compressor (GTCOMP) icon whose shaft power is matched by an expander (GTTURB) icon. There is no workaround for this issue. Your net results will be incorrect in this situation. Gross results are correct. 31. Tight (less than the default of 0.0001) property tolerances can cause equipment warnings not seen when models were run in previous versions. This situation is most likely to occur in models that use GTCOMP or GTTURB icons. As a workaround, perform one of the following actions:
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