An interactive and intelligent psychrometric chart program for HVAC engineers. It provides the most accurate and reliable data based on Hyland and Wexler's reports published by ASHRAE, which treat air and vapor as real gases, rather than ideal gases.
HVAC Tool with Psychrometric Chart and Duct Calculator. 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 is more precise.