Psychrometric Chart
This psychrometric chart use IFC-67 equation for water property calculating, and treat air as ideal gas. So this chart can be used in more large range and are more precise.

1. Metric units(SI) and english units(I/P) support.
2. Eastern style and western style chart support.
3. Angle reference of process line ratio for enthalpy-humidity and sensible-total heat.
4. Zoom in, zoom out chart by rolling mouse wheel, and pan chart by pressing middle mouse button and moving mouse.
5. Chart toolbar for easily processing chart copy, export, print, pan, zoom, redraw and style selection.
6. Save and load data function for each data input grid, this is convenient and not need to input data every time restart program.
7. Option for saving all input data to disk before exit and load them when restarted next time.
8. English and Simplified Chinese language support.
9. Export chart to disk file as Jpeg, bitmap, wmf(Windows Metafile Format) or emf(Enhanced Windows Metafile Format) format.
10. Copy chart to clipboard as wmf or bitmap format.
11. Print function, aspect ratio can be adjust by moving chart boder.
12. Moist and bulb temperature axis range can be changed.
13. Ambient altitude range from 0 to 40km, ambient pressure 0~25bar.
14. Illustrate dry bulb temperature, humidity ratio(or absolute humidity, moist content), constant relative humidity, constant enthalpy, constant specific volume, and constant wet bulb temperature.
15. Mouse point catch and calculate, output point information as dry bulb temperature, humidity ratio(or absolute humidity, moist content), wet bulb temperature, dew point, relative humidity, enthalpy, steam vapor partial pressure, steam saturation pressure, and air physical properties as specific heat, density, viscosity, kine viscosity and conductivity.
16. Calculate once and twice recycle air flow, both summer and winter state, process line shown in chart, press UpDown button to see process changing.
17. Many kinds of processing point manipulation, include point input grid, point definition select, point add, insert, reduce, delete, move up and down, open and save point list.
18. Point defined by dry bulb temperature and another quantity which can be selected.
19. The selected quantity can be changed and automatically transformed from original quantity.
20. Point is optional to pick by mouse clicking on chart.
21. Process lines are optional to be visual on psychrometric chart.
22. Calculate process parameter by selecting point numbers of point definition grid.
23. Calculate process parameter of enthalpy humidity ratio, heating or cooling load, sensible and latent heat.
24. Calculate mix point by mix ratio, and output other info of mix point.
25. Psychrometric point definition transform from any combination to another, and give warning and error information if point is uncertain, if point state is OK then output point information.
26. Point to be transformed can be drawn on chart.
27. Optional chart ploting setup.
28. Colors, line types, line width and font display configeration of chart elements.
29. Preset and user defined chart display configeration groups select, change, add and delete.
30. Precise and large internal drawing for smooth line appearance and print effect.

Duct Calculator
1. Calculate air and liquid duct.
2. Calculate round and rectangle cross section duct.
3. Calculate duct flow resistance, environmental heat exchange, and adiabatic effect.
4. Save and load input data from disk.
Note: Outer coefficient of heat transfer usually 3~10, >10 when winds.