Psychrometer chart & Duct calculator

A convenient, PRECISE and powerful tool for HVAC&R engineers. This psychrometric chart use ASHRAE equations at normal temperature and pressure region and is perfectly consistent with all ASHRAE charts of No.1~7(SI Units) and No.1~5(IP Units). 1. Coordinate system of psychrometric chart is updated to dry bulb temperature and enthalpy; 2. 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); 3. water property calculation is updated to IAPWS-IF97 equation; 4. Introduced real gas effect correlation; 5. Add functions of Grid snap and constant parameter lines at cursor point; 6. Add Grains/lb(d.a) and psia units in psychrometric chart.