New IAPWS models for the calculation of water properties above and below freezing.New constants for the universal gas constant based on CODATA and a revised molar mass of dry air to account for the increase of CO2 in Earth's atmosphere.

Revised chapters for wet-bulb temperature and relative humidity and a revised Appendix V that includes a summary of ASHRAE Research Project RP-1485.Understanding Psychrometrics serves as a lifetime reference manual and basic refresher course for those who use psychrometrics on a recurring basis and provides a four- to six-hour psychrometrics learning module to students air-conditioning designers agricultural, food process, and industrial process engineers meteorologists and others. Individuals may also click on the following links using their mobile device: To download, iPhone/iPad users should visit the App Store and search for 'ASHRAE App'. Zoom in or out of the chart by 'pinching' the iPad screen to view items in detail.Also, you can create templates that you can reuse over and over again. Create an unlimited number of psychrometric chart projects.Email a list of all the points and their properties for a completed chart, along with a PDF of the chart itself.Also, create custom labels anywhere on the chart. Create psychrometric processes by plotting points then connecting them with process lines.In addition, you can double-tap a point to display the point properties and then edit them. As you move your finger around the graph, the psychrometric properties at the top of the screen dynamically update. Using your finger, plot as many points as you want on the screen.Customize the graph in many different ways, including specifying the psychrometric chart line colors, chart background color, hide/display status of chart lines, point colors, process line colors, units of graph values, and the min/max limits of the chart.Display a fully customizable psychrometric chart in both landscape and portrait modes.The ASHRAE Psych Chart app includes the following features and functionality:

Ashrae psychrometric chart calculator