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Interactive Simulator · ASHRAE Guideline 36

BAS AHU Control Sequence Simulator

Simulate ASHRAE Guideline 36 AHU control sequences in real time. Adjust outdoor air temperature, zone demands, and occupancy mode to see how economizer, supply air reset, cooling/heating coils, and fan speed respond.

🎛️ System Inputs

Econ Zone55°F
-10°F100°F
40%
0%100%
0%
0%100%
DESIGN CONSTANTS
Return Air Temp72°F
SAT Range55–65°F
Econ Enable< 70°F OAT
Min OA20%
Min Fan Speed30%
OCCUPANCY MODE
Occupied
ECONOMIZER
✓ Enabled

📊 Control Outputs

Fan Speed30%
OA Damper65%
Cooling Coil0%
Heating Coil0%

🌡️ Air Temperatures

OUTDOOR AIR
55°F
MIXED AIR
61°F
SAT SETPOINT
61°F
ACTUAL SAT
61°F
SEQUENCE LOGIC NOTES
  • SAT reset from 65°F (no load) → 55°F (full cooling demand)
  • Economizer active — OAT 55°F below 70°F enable limit