PsychroAir app icon

PsychroAir — Psychrometric & Moist-Air Calculator

A professional psychrometric calculator for iPhone, iPad and Mac.

PsychroAir lets you calculate all the thermodynamic properties of moist air quickly and more accurately than reading a psychrometric chart. Use it for engineering field calculations, to learn to read psychrometric charts, or to practice moist-air problems for the FE and PE exams.

Download PsychroAir on the App Store iPhone · iPad · Mac
Features

Moist-air properties, faster than a chart

  1. SI (Metric) and IP (English) unit systems supported. Easily toggle between SI and IP.
  2. Input properties — dry-bulb temperature, pressure, and one of the following four properties:
    • Humidity Ratio
    • Relative Humidity
    • Wet-bulb Temperature
    • Dew-point Temperature
  3. Additional input properties — enthalpy & humidity ratio, and dry-bulb temperature & enthalpy.
  4. Output properties:
    • Specific Enthalpy
    • Humidity Ratio
    • Relative Humidity
    • Specific Volume
    • Dry-bulb Temperature
    • Wet-bulb Temperature
    • Dew-point Temperature
    • Mass and volumetric flow rate (adiabatic mixing option)
  5. Calculate adiabatic mixing of two moist-air streams using mass or volumetric flow rate in IP and SI units.
  6. Visualize every result on an ASHRAE-style psychrometric chart — saturation curve, comfort/HVAC envelope and constant-specific-volume lines — with your computed state plotted as a point. Adiabatic mixing gets its own auto-zooming chart showing both streams and the mixture.
  7. Flow-rate input/output units:
    • Mass: kg/s, kg/m, kg/h, lbm/s, lbm/m, lbm/h
    • Volumetric: m³/s, m³/m, m³/h, CFS, CFM, CFH
  8. Humidity-ratio IP units: Grains/lbm and lbm/lbm.
  9. Capable of performing calculations at high and low temperature ranges.
  10. Automatic check for the validity range of the entered and calculated values.
  11. Pressure-versus-altitude relationship tables in SI and IP units.
  12. Seven individual input interfaces: four options for Relative Humidity, Wet-bulb Temperature, Dew-point Temperature and Humidity Ratio input properties; a fifth for enthalpy & humidity ratio; a sixth for dry-bulb temperature & enthalpy; and a seventh for adiabatic mixing of two moist-air streams.
  13. Fun animated flip views let you switch between SI and IP unit systems for each of the interfaces.
  14. Press and hold any results table to copy every row to the clipboard for texting, email or reports.
  15. Six visual looks (themes) to suit your taste, switchable any time from the header.
  16. A user's guide is provided within the in-program help.
  17. Simple & intuitive user interface.