Sequence of Operations Calculator
Control sequence definition from design intent.
Inputs
%
%
Results
OA enthalpy (BTU/lb)
22.72
RA enthalpy (BTU/lb)
28.12
Dry-bulb economizer ON1
Enthalpy economizer ON1
Enthalpy advantage (BTU/lb)5.4
OA humidity ratio (lb/lb)0.01
RA humidity ratio (lb/lb)0.01
Annual dry-bulb free cooling hrs3,500
Annual enthalpy free cooling hrs3,800
Extra hrs from enthalpy method300
Mixed air temp at min OA (°F)73
Mixed Air Temp100pct OA65%
How to Use This Calculator
- Enter Outdoor air temp (°F), Outdoor air RH (%), and Return air temp (°F).
- Set Return air RH (%), Dry-bulb high limit (°F), and Climate Zone.
- Adjust Hot/humid, Mixed as needed.
- Review OA enthalpy (BTU/lb) and RA enthalpy (BTU/lb).
- Use Dry-bulb economizer ON and Enthalpy economizer ON to inform your decision.
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