4.2: Cooling Towers

(24 points)

GREEN GLOBES #4.2.1.1 - ANSI #9.2.1.1 Do cooling towers minimize the amount of make-up water required by achieving one or more of the following?

Recommended Documents 

• Plumbing plans 
• Manufacturer’s specifications, cut sheets, and performance documentation 
• Construction Documents

GREEN GLOBES #4.2.1.1.1 - ANSI #9.2.1.1 - Cycles of concentration in cooling towers achieve one of the following thresholds:

• A minimum of 5 cycles of concentration for make-up water having less than or equal to 200 ppm (200 mg/L) total hardness as calcium carbonate (5 points) 
• A minimum of 3.5 cycles for makeup water with more than 200 ppm (200 mg/L) total hardness as calcium carbonate (5 points) 
• A minimum discharge conductivity of 1500 micromhos/cm or a maximum of 150 ppm (150 mg/L) of silica measured as silicon dioxide (5 points) 
• None of the above (0 points) 
• N/A

Assessment Guidance

Not applicable where there are no wet-cooling towers.

Recommended Documents 

• Construction Documents 
• Manufacturer’s specifications, cut sheets, and performance documentation 
• Plumbing plans

Assessment Guidance

Not applicable where there are no wet-cooling towers.

Recommended Documents 

• Construction Documents 
• Manufacturer’s specifications, cut sheets, and performance documentation 
• Plumbing plans

GREEN GLOBES #4.2.1.1.2 - ANSI #9.2.1.1 - One of the following target performance metrics is met:

• 6 cycles are achieved where the tower target performance metric is defined in 4.2.1.1.1 as 5 (4 points) 
• 4.5 cycles are achieved where the target performance metric is defined in 4.2.1.1.1 as 3.5 and these cycles of concentration are sustained while maintaining the defined threshold water quality parameters in 4.2.1.1.1 (4 points) 
• None of the above (0 points) 
• N/A

Assessment Guidance

Not applicable where there are no wet-cooling towers.

Recommended Documents 

• Construction Documents 
• Manufacturer’s specifications, cut sheets, and performance documentation 
• Plumbing plans

GREEN GLOBES #4.2.1.1.3 - ANSI #9.2.1.1 At least 25% of a cooling tower’s annual makeup water is from safe and approved alternative non-potable sources?

• Yes (4 points)
• No (0 points)
• N/A

Assessment Guidance

Not applicable where there are no wet-cooling towers.

Recommended Documents 

• Construction Documents 
• Manufacturer’s specifications, cut sheets, and performance documentation 
• Plumbing plans

GREEN GLOBES #4.2.1.2 - ANSI #9.2.1.2 Are advanced predictive or tracking tower control systems used to mediate cooling tower makeup and discharge?

• Yes (2 points)
• No (0 points)
• N/A

Assessment Guidance

Not applicable where there are no wet-cooling towers.

Recommended Documents 

• Construction Documents 
• Manufacturer’s specifications, cut sheets, and performance documentation 
• Plumbing plans

GREEN GLOBES #4.2.1.3 - ANSI #9.2.1.3 What percentage of annual cooling demands are replaced by non-evaporative cooling?

• ≥75% and ≤100% (7 points) 
• ≥50% and <75% (4 points) 
• ≥20% and <50% (2 points) 
• <20% (0 points) 
• N/A

Assessment Guidance

Not applicable where there are no wet-cooling towers.

Recommended Documents 

• Construction Documents 
• Manufacturer’s specifications, cut sheets, and performance documentation 
• Plumbing plans

GREEN GLOBES #4.2.1.4 - ANSI #9.2.1.4 Are cooling tower(s) equipped with drift eliminators that achieve efficiency of one of the following?

• Yes, 0.001% or less for counterflow systems (2 points) 
• Yes, 0.002% or less for crossflow systems (2 points)
• No (0 points) 
• N/A

Assessment Guidance

Not applicable where there are no wet-cooling towers.

Recommended Documents 

• Construction Documents 
• Manufacturer’s specifications, cut sheets, and performance documentation 
• Plumbing plans

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