HVAC Psychrometric Plus for the Apple iPhone/iPod Touch

Click here to go to Apple iTunes to download this app.

(Click here for the detailed help file that is included with the app.)

The "Psychrometric Plus" application allows you to easily perform single-state and mixed-air HVAC psychrometric calculations. This psychrometric application is unique amongst all other iPhone psychrometric apps in the following ways:

1. Select and update all input parameters and view the calculated results all in the same screen without switching from one screen to another.
2. Select from 20 different combinations of any 2 input parameters such as "Humidity Ratio / Dewpoint Temperature" and much more.
3. Immediately view updated results as you change the input values using the on-screen slider control. You can specify how much to increase or decrease values as you slide the indicator along the slider mechanism.

This application contains two separate input modes. The "Single-State" mode allows you to specify 2 psychrometric parameters for a single stream of air and view the remaining 6 calculated values. You can quickly toggle through 20 different combinations of the 2 input parameters and instantly view the calculated results, all on the same screen.


The 2nd input mode is the "Mixed-Air" mode that allows you to specify 2 psychrometric parameters for each of two air streams to calculate the mixed air psychrometric conditions. Once again, you can toggle through 20 combinations of the 2 input parameters and view all results in one screen.


The following input and output value-types are displayed:

1. Dry-bulb temperature
2. Humidity ratio
3. Relative Humidity
4. Wet-bulb temperature
5. Partial pressure
6. Enthalpy
7. Specific volume
8. Dewpoint temperature
9. Total airflow or mass flow (for mixed-air calcs, only)

You can specify additional parameters such as the altitude of the air being analyzed, the atmospheric pressure, different types of units such as degrees F or R, and English or Metric units.


The "HVAC Psychrometric Plus" application was designed by Carmel Software Corporation, a leader in HVAC design software since 1995. In fact, Autodesk (the makers of AutoCAD) acquired our load calculation software and incorporated it into their leading 3D modeling software called Revit.

If you have comments or questions, please submit comments here.

Click here to go to Apple iTunes to download HVAC Psychrometric Plus.