Precision Thermodynamic &
Psychrometric Analysis
The complete web-based thermodynamic workspace for mechanical engineers and HVAC designers. Solve multi-state points, analyze coil deltas, and explore interactive Psychrometric and Mollier charts.
Thermodynamic Tools & Workspaces
Select an engineering environment to begin analyzing moist air systems
Interactive Psychrometric Chart
Carrier-style temperature vs humidity ratio diagram. Live crosshair inspection, continuous enthalpy guidelines, and drag-and-drop state point adjustments.
Standard Mollier Diagram
European standard (DIN 4107) h-x diagram with oblique enthalpy guidelines, horizontal 0°C isotherms, absolute humidity lines, and saturation curves.
Custom Pair State Point Solver
Input any two distinct parameters (DBT, WBT, DPT, RH, Humidity Ratio, Enthalpy) to calculate the complete thermodynamic state of moist air.
AHU Process Delta Analyzer
Compute sensible and latent enthalpy deltas (Δh, ΔT, ΔW, ΔRH) between any two state points to size heating/cooling coils and humidifiers.
Altitude & Barometric Adjustment
Adjust site elevation and atmospheric pressure in real-time. Automatically recalculates moist air density, vapor pressure, and saturation states.
Data Summary & CSV Export
Full tabular breakdown of all thermodynamic state variables (Tdb, Twb, Tdp, RH, W, h, v, pv). Export directly to CSV for engineering reports.
ASHRAE 2017 & ISO Standards Compliant
PsychroLab implements the official formulas from the 2017 ASHRAE Handbook — Fundamentals (Chapter 1: Psychrometrics) and European DIN 4107 standards. Vapor pressures are solved with high-order polynomial formulations accurate across freezing (-100°C to 0°C) and standard ambient (0°C to 200°C) ranges.
Built for Field Engineers & Students
Whether sizing cooling coils, determining sensible heat ratios (SHR), assessing data center free cooling hours, or evaluating cleanroom dehumidification cycles, PsychroLab provides instant calculation without software installations or heavy spreadsheets.
- Air Handling Unit (AHU) mixed air & coil load calculations
- Evaporative cooling tower wet-bulb approach analysis
- Building envelope condensation & dew point risk assessment