New in Psychrometric + Duct Calculator 4.0 (Feb 5, 2011)
- Coordinate system of psychrometric chart is updated to dry bulb temperature and enthalpy;
- Add ASHRAE equation support at normal temperature and pressure region, now this psychrometric chart is perfectly consistent with all ASHRAE charts of No.1~7(SI Units) and No.1~5(IP Units);
- Water property calculation is updated to IAPWS-IF97 equation;
- Introduced real gas effect correlation;
- Add functions of grid snap and constant parameter lines at cursor point;
- Add grains/lb(d.a) and psia units in psychrometric chart.