Add "or evaporative condensers" after "cooling tower" in the third bullet
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Credit language
© Copyright U.S. Green Building Council, Inc. All rights reserved.
Requirements
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- Cooling towers and evaporative condensers for air conditioning systems, such as chilled water systems, shall achieve a minimum of five cycles of concentration based on a ratio of the conductivity of the water being discharged (blowdown) divided by the conductivity of the feed (makeup) water(s), or four cycles of concentration, if the makeup water hardness exceeds 200 mg/l expressed as calcium carbonate, or shall achieve a minimum discharge (blowdown) concentration of 1500 mg/L (1500 ppm) expressed as calcium carbonate, or 175 mg/L (175 ppm) of silica measured as silicon dioxide, whichever is met first.
- Cooling towers and evaporative condensers shall be equipped with makeup and blowdown meters, conductivity controllers and overflow alarms and efficient drift eliminators that reduce drift loss to less than, or equal to, 0.001% of recirculating water in a counter-flow tower or 0.005% in a cross-flow tower.
- Use no more potable water than 2.3 gallons per ton hour (2.5 liters per kilowatt hour) for cooling tower or evaporative condenser make-up.
- Projects without cooling towers or evaporative condensers are ineligible for this credit
What does it cost?
Cost estimates for this credit
On each BD+C v4 credit, LEEDuser offers the wisdom of a team of architects, engineers, cost estimators, and LEED experts with hundreds of LEED projects between then. They analyzed the sustainable design strategies associated with each LEED credit, but also to assign actual costs to those strategies.
Our tab contains overall cost guidance, notes on what “soft costs” to expect, and a strategy-by-strategy breakdown of what to consider and what it might cost, in percentage premiums, actual costs, or both.
This information is also available in a full PDF download in The Cost of LEED v4 report.
Learn more about The Cost of LEED v4 »Frequently asked questions
See all forum discussions about this credit »Addenda
10/1/2012 – Updated: 2/14/2015
Global ACP
Description of change:
Campus Applicable
No
Internationally Applicable:
Yes
10/1/2012 – Updated: 2/14/2015
Global ACP
Description of change:
Add "or evaporative condensers" after "cooling towers" in the fourth bullet
Campus Applicable
No
Internationally Applicable:
Yes
10/1/2012 – Updated: 2/14/2015
Global ACP
Description of change:
Add "and evaporative condensers" after "Cooling towers" in the first bullet
Campus Applicable
No
Internationally Applicable:
Yes
10/1/2012 – Updated: 2/14/2015
Global ACP
Description of change:
Add "and evaporative condensers" after "Cooling towers" in the second bullet
Campus Applicable
No
Internationally Applicable:
Yes
2/2/2011 – Updated: 2/14/2015
Rating System Correction
Description of change:
Add the following bullet at the end of the page:
Campus Applicable
No
Internationally Applicable:
No
Documentation toolkit
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© Copyright U.S. Green Building Council, Inc. All rights reserved.
Requirements
-
- Cooling towers and evaporative condensers for air conditioning systems, such as chilled water systems, shall achieve a minimum of five cycles of concentration based on a ratio of the conductivity of the water being discharged (blowdown) divided by the conductivity of the feed (makeup) water(s), or four cycles of concentration, if the makeup water hardness exceeds 200 mg/l expressed as calcium carbonate, or shall achieve a minimum discharge (blowdown) concentration of 1500 mg/L (1500 ppm) expressed as calcium carbonate, or 175 mg/L (175 ppm) of silica measured as silicon dioxide, whichever is met first.
- Cooling towers and evaporative condensers shall be equipped with makeup and blowdown meters, conductivity controllers and overflow alarms and efficient drift eliminators that reduce drift loss to less than, or equal to, 0.001% of recirculating water in a counter-flow tower or 0.005% in a cross-flow tower.
- Use no more potable water than 2.3 gallons per ton hour (2.5 liters per kilowatt hour) for cooling tower or evaporative condenser make-up.
- Projects without cooling towers or evaporative condensers are ineligible for this credit
