we credit 4.2: water use reduction cooling towers
LEED 2009 for Healthcare: New Construction and Major Renovations
WE CREDIT 4.2: WATER USE REDUCTION COOLING TOWERS All fields and uploads are required unless otherwise noted.
ALL CASES This static sample form has been modified for offline access. All sections of the form are visible. Sample forms are for reference only. Select one of the following methods of demonstrating a minimum discharge (blowdown) concentration: Cycles of Concentration. Cooling towers for air conditioning systems will achieve a minimum of five cycles of concentration (or four, if makeup water hardness exceeds 200mg/L expressed as calcium carbonate) based on a ratio of the conductivity of the water being discharged (blowdown) divided by the conductivity of the feed (makeup) water. Minimum Discharge. Cooling towers for air conditioning systems will 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.
CYCLES OF CONCENTRATION Select one of the following Makeup water hardness exceeds 200 mg/L expressed as calcium carbonate. Makeup water hardness DOES NOT exceed 200 mg/L expressed as calcium carbonate. Table WEc4.2-1. Makeup Water Hardness Water Conductivity (µS/ml) Discharged water (blowdown)
Feed (makeup) water
Ratio
Ratio of conductivity of discharged water to feed water must be at least four to meet credit requirements. Ratio of conductivity of discharged water to feed water must be at least five to meet credit requirements.
Upload WEc4.2-1. Provide EITHER a report showing the results of a water hardness test at the building site, OR a copy of the local water supplier's annual water quality report to confirm the hardness of the feed water supply exceeds 200mg/L expressed as calcium carbonate.
Upload
MINIMUM DISCHARGE Conductivity controller setpoint for calcium carbonate:
mg/L
LEED 2009 for Healthcare: New Construction and Major Renovations WE Credit 4.2: Water Use Reduction - Cooling Towers
Version 4.0 Copyright © 2011 U.S. Green Building Council. All Rights Reserved.
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Concentration must be at least 1500 mg/L (1500 ppm).
Conductivity controller setpoint for silicon dioxide:
mg/L
Concentration must be at least 175 mg/L (175 ppm).
All cooling towers are 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. No cooling tower uses more than 2.3 gallons of potable water per ton hour for cooling tower make-up. Upload WEc4.2-2. Provide cut sheets for makeup and blowdown meters, conductivity controllers and overflow alarms, and drift eliminators.
Upload
ADDITIONAL DETAILS Special circumstances preclude documentation of credit compliance with the submittal requirements outlined in this form. This section may be used to articulate unique issues not addressed in the form.
SPECIAL CIRCUMSTANCES Describe the circumstances limiting the project team's ability to provide the submittals required in this form. Be sure to reference what additional documentation has been provided, if any. Non-standard documentation will be considered upon its merits.
Upload WEc4.2-SC. Provide any additional documentation that supports the claim to special circumstances. (Optional)
Upload
The project team is using an alternative compliance approach in lieu of standard submittal paths.
LEED 2009 for Healthcare: New Construction and Major Renovations WE Credit 4.2: Water Use Reduction - Cooling Towers
Version 4.0 Copyright © 2011 U.S. Green Building Council. All Rights Reserved.
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ALTERNATIVE COMPLIANCE PATH Describe the alternative compliance path used by the project team. Include justification that this path meets the credit intent and requirements. Be sure to reference what additional documentation has been provided, if any. Non-standard documentation will be considered upon its merits.
Upload WEc4.2-ACP. Provide any additional documents that support the alternative compliance path approach. (Optional)
Upload
SUMMARY WE Credit 4.2: Water Use Reduction - Cooling Towers Points Documented:
LEED 2009 for Healthcare: New Construction and Major Renovations WE Credit 4.2: Water Use Reduction - Cooling Towers
Check Compliance
Version 4.0 Copyright © 2011 U.S. Green Building Council. All Rights Reserved.
Page of
WE CREDIT 4.2: WATER USE REDUCTION COOLING TOWERS All fields and uploads are required unless otherwise noted.
ALL CASES This static sample form has been modified for offline access. All sections of the form are visible. Sample forms are for reference only. Select one of the following methods of demonstrating a minimum discharge (blowdown) concentration: Cycles of Concentration. Cooling towers for air conditioning systems will achieve a minimum of five cycles of concentration (or four, if makeup water hardness exceeds 200mg/L expressed as calcium carbonate) based on a ratio of the conductivity of the water being discharged (blowdown) divided by the conductivity of the feed (makeup) water. Minimum Discharge. Cooling towers for air conditioning systems will 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.
CYCLES OF CONCENTRATION Select one of the following Makeup water hardness exceeds 200 mg/L expressed as calcium carbonate. Makeup water hardness DOES NOT exceed 200 mg/L expressed as calcium carbonate. Table WEc4.2-1. Makeup Water Hardness Water Conductivity (µS/ml) Discharged water (blowdown)
Feed (makeup) water
Ratio
Ratio of conductivity of discharged water to feed water must be at least four to meet credit requirements. Ratio of conductivity of discharged water to feed water must be at least five to meet credit requirements.
Upload WEc4.2-1. Provide EITHER a report showing the results of a water hardness test at the building site, OR a copy of the local water supplier's annual water quality report to confirm the hardness of the feed water supply exceeds 200mg/L expressed as calcium carbonate.
Upload
MINIMUM DISCHARGE Conductivity controller setpoint for calcium carbonate:
mg/L
LEED 2009 for Healthcare: New Construction and Major Renovations WE Credit 4.2: Water Use Reduction - Cooling Towers
Version 4.0 Copyright © 2011 U.S. Green Building Council. All Rights Reserved.
Page of
Concentration must be at least 1500 mg/L (1500 ppm).
Conductivity controller setpoint for silicon dioxide:
mg/L
Concentration must be at least 175 mg/L (175 ppm).
All cooling towers are 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. No cooling tower uses more than 2.3 gallons of potable water per ton hour for cooling tower make-up. Upload WEc4.2-2. Provide cut sheets for makeup and blowdown meters, conductivity controllers and overflow alarms, and drift eliminators.
Upload
ADDITIONAL DETAILS Special circumstances preclude documentation of credit compliance with the submittal requirements outlined in this form. This section may be used to articulate unique issues not addressed in the form.
SPECIAL CIRCUMSTANCES Describe the circumstances limiting the project team's ability to provide the submittals required in this form. Be sure to reference what additional documentation has been provided, if any. Non-standard documentation will be considered upon its merits.
Upload WEc4.2-SC. Provide any additional documentation that supports the claim to special circumstances. (Optional)
Upload
The project team is using an alternative compliance approach in lieu of standard submittal paths.
LEED 2009 for Healthcare: New Construction and Major Renovations WE Credit 4.2: Water Use Reduction - Cooling Towers
Version 4.0 Copyright © 2011 U.S. Green Building Council. All Rights Reserved.
Page of
ALTERNATIVE COMPLIANCE PATH Describe the alternative compliance path used by the project team. Include justification that this path meets the credit intent and requirements. Be sure to reference what additional documentation has been provided, if any. Non-standard documentation will be considered upon its merits.
Upload WEc4.2-ACP. Provide any additional documents that support the alternative compliance path approach. (Optional)
Upload
SUMMARY WE Credit 4.2: Water Use Reduction - Cooling Towers Points Documented:
LEED 2009 for Healthcare: New Construction and Major Renovations WE Credit 4.2: Water Use Reduction - Cooling Towers
Check Compliance
Version 4.0 Copyright © 2011 U.S. Green Building Council. All Rights Reserved.
Page of
