Engineering Workbench

Free, interactive HVAC&R engineering tools: an interactive p-h diagram, a psychrometric chart, refrigerant and air system designers, a fluid property calculator for 390+ fluids, unit conversions, and dimensionless-number calculations — all running on the same engineering-grade property engines.

Systems & Cycle Solving
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Refrigerant Systems
Model refrigeration and heat pump cycles with real-time calculations.
Air Systems
Design AHUs, cooling coils, and ventilation systems.
Charts
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Psychrometric Chart
Analyze moist air properties and plot HVAC processes.
P-h Chart
Visualize refrigerant properties and plot state points.
Property Calculations
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Property Calculator
Thermodynamic and transport properties for 390+ fluids.
 Air — ASHRAE 2021 / RP-1485 psychrometrics Refrigerant — 130 pure + 148 blends Water / Steam — IAPWS-95 and IF97 Incompressible — glycols, brines, HTFs, seawater
Utilities
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Unit Conversions
Convert between common engineering and HVAC/R units.
Dimensionless Numbers
Calculate Reynolds, Nusselt, Prandtl, Rayleigh, and 18 more.