AirCalc Psychrometric
Duong Nguyen Huu
AirCalc Pro is a professional-grade psychrometric calculator and HVAC engineering toolkit designed for HVAC engineers, mechanical engineers, and building science professionals. Enter any two air properties and instantly compute all eight psychrometric parameters — no internet connection required. CORE FEATURES • Psychrometric Calculator Select any 2 of 8 parameters as inputs: Dry Bulb Temperature, Relative Humidity, Absolute Humidity, Humidity Ratio, Dew Point, Wet Bulb Temperature, Enthalpy, and Specific Volume. The app instantly calculates all remaining values. • Interactive Psychrometric Chart Visualize air states on a real-time psychrometric diagram. Tap or drag the state point to explore different conditions. The chart displays relative humidity curves (10%–100%), constant enthalpy lines, saved state points, and coil process lines with SHR direction. • 27 Input Combinations Supports 27 valid input pair combinations with robust solvers including direct computation and Newton-Raphson iteration for complex pairs. ENGINEERING TOOLS • Load Calculator Enter airflow rate (CFM or m³/h) with supply and return air states to calculate total, sensible, and latent cooling/heating loads, moisture removal rate, and condensate rate. • Mixed Air Calculator Blend outdoor air and return air by percentage to calculate the mixed air state. Useful for AHU, economizer, and ventilation analysis. • Coil Process Analyzer Analyze entering and leaving air conditions across a coil. Calculates Sensible Heat Ratio (SHR), total/sensible/latent capacity, dehumidification status, and condensate rate. • Save & Compare States Save air states with custom labels. Compare any two saved states side-by-side with color-coded deltas for all parameters. Saved states also appear as numbered points on the psychrometric chart. • PDF Export Generate and share professional psychrometric reports as PDF directly from the app. SETTINGS & LOCALIZATION • Unit Conversion: switch between °C/°F and kPa/atm • 8 Languages: English, Japanese (日本語), Chinese (中文), Korean (한국어), Thai (ไทย), Vietnamese (Tiếng Việt), German (Deutsch), and Spanish (Español) • Auto-detects device language on first launch TECHNICAL DETAILS • Based on standard psychrometric equations (Magnus formula, ASHRAE reference methods) • Dry bulb temperature range: -20°C to 90°C • Standard atmospheric pressure: 101.325 kPa (adjustable) • All calculations performed locally — fully offline • Results in under 10 milliseconds DESIGNED FOR • HVAC system design and commissioning • Indoor air quality analysis • Building energy audits • Mechanical engineering coursework • Clean room and data center climate control • Agricultural and food processing environments AirCalc Pro delivers the accuracy of psychrometric reference tables with the convenience of a modern mobile interface. One purchase, no subscriptions, no ads, no data collection.