Known Problems

•	The pictures on the toolbar may sometimes disappear. If this happens it's because you have an old version of Windows 95/NT (or more precisely an old version of the system file ComCtl32.dll). Download and install the following update from Microsoft: ftp://ftp.microsoft.com/softlib/mslfiles/40comupd.exe.

Future changes

This section lists the changes that I hope to implement in the nearest future - suggestions, comments etc. are welcome - but as Refrigeration Utilities is a spare time project these changes are not guarantied to ever take place (if somebody feels like sponsoring some of the changes, that is sponsoring my time at the Technical University of Denmark - they are very welcome) 

•	Implement complete RefProp equation set - including mixtures. And add possibility to draw diagrams for user defined refrigerants.
•	Add more cycles – this will probably end up with implementing a tight connection to EESCoolTools (www.et.dtu.dk/coolpack)
•	Draw cycles in T-s and h-s diagrams
•	Change cycle handling so that users can keep a library of cycles they can select into log(p)-h, T-s and h-s diagrams
•	Possibility to use English units
•	Make the program an OLE document server
•	Include pressure drop calculation for pipes and heat exchangers
•	Drawing circles, squares and other geometries in plots
•	Changing the file format so that backward compatibility is insured
•	…

Changes from version 2.83 to 2.84
•	Fixed bug in interface to RefProp equations (bug only concerned thermophysical property equations)
•	Updated equations for thermophysical porperties of R134a
•	Changed Refrigerant Calculator and Heat transfer fluid calculator so that the icon in the taskbar is optional.

Changes from version 2.82 to 2.83
•	Fixed bug in Refrigerant calculator (conductivity of liquid was calculated using the viscosity function)

Changes from version 2.81 to 2.82
•	ftp possibility is removed from the program (Help|Download latest version menu removed). We have changed server, ip numbers and the program is available from www.et.dtu.dk/Coolpack, so there was no reason to keep the ftp.
•	Heat transfer fluid calculator has got a new fluid, and it is possible to shift between concentrations in mass% and volume% for some fluids
•	Heat transfer fluid calculator and Refrigerant calculator now has their own version numbers - starting at 2.0. 

Changes from version 2.80 to 2.81
•	Because of respons on the new toolbar design, the old toolbar design (version 2.73) is now selected by default. The new design can be selected by changing toolbar images in the Preferences dialog.
•	The coordinates display (on the statusbar at the bottom) will now display both v and x in the twophase area. The coordinate display is also changed, so that it is possible to change the number of decimals a value is displayed with. The number of decimals are changed by right-clicking on the coordinate.
•	Preferences file format changed to make update easier.
•	Preferences are now saved in seperate files for each user of RefUtil. This means you can run RefUtil on the network, and still have seperate preferences for each user. The preferences are saved in files called Pref_username.cfg where username is the Windows username.
•	Preferences can now be saved and loaded from the Preferences dialog, i.e. you can work with several different preferences files.

Changes from version 2.73 to 2.80
•	Changed icons and toolbar appearence (makes updates easier)
•	Added volumetric efficiency input in Show cycle info dialog (i.e. enables calculation of compressor displacement)
•	Corrected error which occured when you tried to draw a cycle for a refrigerant with critical temperature below 0°C.

Changes from version 2.72 to 2.73
•	Corrected bug in IX-diagram (curves now have correct values)
•	Data from SpreadSheet can be pasted into the "Input cycle data" dialog.

Changes from version 2.71 to 2.72
•	Changed zoom-function

Changes from version 2.70 to 2.71
•	Fixed bug when saving/loading log(p)-h diagram with reference different from default.
•	Changed/improved saving diagrams as images.
•	Changed the Page setup dialog box.

Changes from version 2.60 to 2.70

Changes from version 2.63 to 2.70
•	Log(p)-h diagram, saturation tables and tables can now be used with RefProp version 6.0. Only part of the RefProp refrigerants can currently be used in the program (I couldn't get the others to work…). You need to have RefProp 6.0 installed to enable this feature. Select the File Preferences menu and select the Equation set tab. Then you have to specify a path to the "fluids" directory, which is a subdirectory to the directory where you installed RefProp. You can press the Find button and the program will try to find the directory itself. When you thereafter try to draw a log(p)-h diagram you will see a checkbox labeled RefProp equations - check it and the refrigerants will appear in thew listbox. Note that RefProp equations are considerabely slower than the built-in equations. I haven't investigated the difference between RefProp and the built-in equations (but it seems to be very small).
•	This document is now part of the program - hopefully this will force me to keep a better version control…
•	Cycles can be set on/off so that you can have several cycles without drawing all of them. Select Options - Input cycle menu and check/uncheck the Draw cycle checkbox 
•	Cycles can be copied between log(p)-h diagrams. Select Options - Input cycle menu and press the Copy/Paste buttons.
•	Holding down <Shift> button when you draw a polyline or when you measure the distance between two points will fix the x-coordinate. Holding <Ctrl> will fix the y-coordinate
•	An Update button has been added to the Cycle info dialog
•	The caption of a plot has been fixed - this ensures correct drawing when switching between wysiwyg and normal mode.
•	Preferences now available at all times - select File - Preferences menu.
•	New shortcuts added - see online help
•	Now coordinates in the liquid area are displayed in the status line (for log(p)-h diagrams). Not all of the built-in equation of state's support the liquid area - in this case the T and s coordinates are calculated as saturation values at the current enthalpy (i.e. it is assumed that isotherms and isentrops are parallel to isenthalps in the liquid area). This will be shown in the statusline by replacing "=" with "~".
•	The program will now prevent you from drawing isotherms and isenthalps in the liquid area if the equation of state for the refrigerant isn't valid in the liquid area.
•	You can make the background of labels on curves invisible. This can be done for all the labeled curves in the plot by selecting the Format - Plot menu, or you can do it for individual curves (try selecting a curve, doubbleclick and check the Label background invisible checkbox).
•	Every time you click in a plot, the coordinates of the mouse will be logged. You can print, save or copy these coordinates if you select the Options - Show log menu.

Changes from version 2.62 to 2.63
•	Fixed a bug that occurred when selecting pressure unit in Saturation tables

Changes from version 2.61 to 2.62
•	All curves can now be printed in black - select the File - Page setup menu
•	The width of all curves can be changed when printing - select the File - Page setup menu
•	Names on cycles are now printed when you select the Options - Show cycle info and press the Print button
•	Width of labeled lines can be changed. Select for example Format - Gas area - Isentrops menu and change the value in the Add to width of labeled lines spin-box.

Changes from version 2.60 to 2.61
•	Changed so that the number of copies in the print dialog agrees with the number of copies actually printed (before you got 400 copies if you specified 20… oops).

Changes in version 2.60
•	Drawing of isotherms and isentrops in the liquid area in log(p)-h diagrams - this is accessed through the Plot specific tab in the dialog where you select the refrigerant.
•	Measure feature in plots - accessed by using the measure button in the toolbar. Click the button and click two different places in the plot and the difference between the to clicks in thermodynamic coordinates is displayed.
•	Changed error-handling when drawing log(p)-h diagrams. Now the program continues to draw diagrams even if an error occurs. You can inspect the errors (if any) by selecting the Options - Show errors menu.
•	Now text on curves inside plots can be different from angular - you can also set it to horizontal or vertical.
•	Selection of pressure/temperature units in tables
•	A name can be specified for cycles in log(p)-h diagrams
•	Refrigeration Utilities can now act as a DDE-server, where you can poke cycle data from another program - see online help.