AHU Psychrometric Calculator

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Project / document details

These fields appear in the PDF output.
Step 1

Key Design Conditions & Plant

%

Summer outdoor

°C
°C
%

Winter outdoor

°C
°C
%

Room condition

°C
%
±°C
±%

Occupancy

people

Chilled water

°C
°C
K
%

LPHW

°C
°C
K

Cooling Coil

Step 2

Airflows

m³/s
m³/s
%
m³/s
m³/s
m³/s
%
Design supply flow (incl. margin)
m³/s
Design fresh air (incl. margin)
m³/s
Design exhaust air (incl. margin)
m³/s
Step 3

Cooling Coil Sizing (Summer / Dehumidification)

Latent load

Total cooling duty
kW
CHW flowrate (incl. glycol)
kg/s
CHW pipe size
mm
Step 4

Summer Reheat Coil

Off-cooling coil temperature
°C
Off-cooling coil temp after fan pick-up
°C
Reheat type
Minimum Reheat off-coil temperature
°C
Design Reheat off-coil temperature
°C
Reheat coil load
kW
Reheat water flowrate
kg/s
Reheat pipe size
mm
PLOT

Summer psychrometric process

Simplified T–w charts (101.325 kPa). Click Plot Chart to generate; click Replot if inputs change.
Figure 1: Summer psychrometric process
Legend
Psychrometric data at plot points
Step 5

Winter Preheat Coil & Heat Recovery

Outdoor air dry-bulb TOA (winter)
°C
Frost protection setpoint
°C
Preheat required?
Step 6

Winter reheat (upstream of humidifier)

°C
°C
°C
YES
Resolve the Step 5 frost / preheat issue before sizing winter reheat.
Winter reheat duty
kW
LPHW flowrate
kg/s
LPHW pipe size
mm
Step 7

Winter Humidification

°C
%
%
Room Moisture Content
kg/kg
Outdoor air moisture content
kg/kg
Humidifier required?
Humidifier duty
kg/hr
PLOT

Winter psychrometric process

Simplified T–w charts (101.325 kPa). Click Plot Chart to generate; click Replot if inputs change.
Figure 2: Winter psychrometric process
Legend
Psychrometric data at plot points
Output

Psychrometric Analysis & Coil Sizing Report

Generate a professional PDF report with all calculations and psychrometric charts.