Evaporative Cooling

Analyze direct and indirect evaporative cooling systems showing temperature and humidity changes. Compare dry bulb temperature reduction, relative humidity changes, and cooling effectiveness for both direct and indirect evaporative cooling processes.

Calculator

Inputs

Initial Dry Bulb Temperature (°F)

Initial Relative Humidity (%)

Humidification Level (%)

Results

Final Dry Bulb Temperature (Direct)-- °F

Final Relative Humidity (Direct)-- %

Calculator

Inputs

Initial Dry Bulb Temperature (°F)

Initial Relative Humidity (%)

Secondary Air Humidification Level (%)

Results

Final Dry Bulb Temperature (Indirect)-- °F

Final Relative Humidity (Indirect)-- %

Property	Direct Evaporative	Indirect Evaporative
Dry Bulb Temperature	Reduced significantly	Reduced moderately
Wet Bulb Temperature	Unchanged	Reduced
Relative Humidity	Increased significantly	Increased moderately
Specific Humidity	Increased	Unchanged
Moisture Added to Primary Air	Yes	No
Final Temp (70°F, 60% RH)	~61°F	~65°F
Final RH (70°F, 60% RH)	~100%	~83%

Key Benefits of Evaporative Cooling

Cost Effective: Can reduce DX compressor system size and runtime
Environmentally Friendly: No refrigerants required
High Temperature Performance: More effective than DX systems at higher temperatures

Safety Considerations

⚠️ Legionella Risk: Water systems operating between 69°F (20.5°C) and 122°F (50°C) are potential legionella sources. Proper maintenance and water treatment are essential.