Air System Designer — Model AHUs and HVAC Air Processes Online
Adjust parameters to solve
Node States ▾
Solve a system to see node states
About the Air System Designer Want the chart by itself? Open the Psychrometric Chart
Build an AHU from templates and watch every air state and process line update on a live psychrometric chart.
How it works
Set outdoor air, return air, flows, and coil duties. Every station state (after the mixing box, off the coil, after the fan) is computed with ASHRAE RP-1485 psychrometrics and drawn on the chart as you change inputs.
Components
Mixing boxes, cooling coils with wet-coil dehumidification, heating coils, energy recovery, fans with pressure rise and heat gain. Pre-built AHU templates; SI or IP units.
Related tools
Freehand state points and process lines: psychrometric chart. Single moist-air states: property calculator, Air tab — same ASHRAE relations.
FAQ
What does the air system designer do?
It models an AHU end to end: mixing, coils, energy recovery, fans. Every air state is computed with ASHRAE psychrometrics and plotted as process lines on a live psychrometric chart.
What components can I include?
Mixing boxes, cooling coils with wet-coil dehumidification, heating coils, energy recovery, and fans with pressure rise and heat gain, arranged from pre-built AHU templates.
Is it free?
Base templates are free with sign-in. More configurations are paid — see pricing.
How is this different from the psychrometric chart?
The chart is a canvas you draw on. The designer solves a connected system and draws the process chain for you.