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Prerequisite vs. credit
EAp3: Fundamental Refrigerant Management calls for elimination of CFC-based refrigerants, to prevent ozone depletion. However, that’s just one piece of the environmental puzzle when it comes to refrigerants. Many CFC substitutes act as very strong greenhouse gases, contributing to global warming—and adding that piece of the puzzle is the focus of this credit.
EAc5 encourages significant reduction or elimination of all refrigerants in base building systems, and at the very least, works to promote use of refrigerants that have the lowest global warming potential.
Do you use CFCs?
If your building is still using CFC-based refrigerants, it will be very difficult to earn this credit. Likewise, this credit will be difficult if you are using inefficient base building equipment or if the majority of cooling is satisfied with multiple smaller systems, such as window units.
You’ll be in the best position to earn the credit with efficient, centralized chiller equipment using refrigerants with low ozone depletion and global warming potential.
It’s an accounting credit
This credit is basically an accounting credit to document the refrigerants used in your base building systems, determine the efficiency and leakage rates of your equipment and calculate the overall environmental impact of those refrigerants in terms of ozone depletion and global warming potential. Performing the required calculations will give you your “Total Refrigerant Impact Per Ton” value. That value must be less than or equal to 100 in order to achieve this credit.
Well-managed buildings should be tracking most of this information already and will simply need to plug all of the data into the provided calculator to determine credit compliance.
A lot of the required data for this credit can be found on a product data tag affixed to the equipment.Start with a systems review
Start by verifying that your building fire suppression systems do not use halonsHalons are substances, used in fire-suppression systems and fire extinguishers, that deplete the stratospheric ozone layer., CFCs or HCFCsHydrochlorofluorocarbons (HCFCs) are refrigerants that cause significantly less depletion of the stratospheric ozone layer than chlorofluorocarbons.. If you find any of these chemicals, you won’t be able to earn the credit without converting those systems. Alternatives to these materials include HFCs, water, foam, and carbon dioxide.
If your building uses natural ventilation with no mechanical cooling, you can earn this credit without further analysis.
If your building uses mechanical or mixed-mode ventilation, collect information on all base building systems that use refrigerants, including manufacturer, model number, installation date, refrigerant type, and amount used in the equipment.
Retrofits unlikely
After performing the initial review, if a project finds that it doesn’t qualify for the credit, it’s rare for it to undergo an HVAC retrofit to earn the credit, due to the costs involved. However, the criteria can be a good set of guidelines for future HVAC projects.
Test and maintain your equipment regularly to minimize refrigerant leakage.Whether or not you are pursuing the credit, keep in mind the following principles:- Ideal refrigerants strike a good balance between efficient operation, minimal ozone depletion potential, and minimal global warming potential.
- The best HVAC equipment is efficient, has low leakage rates, and has a long service life.
- Implementation of a refrigerant management program will help you to track and minimize refrigerant leakage over the life of the equipment.
Building engineer must sign off
The required calculations may be performed internally using the provided calculator in the LEED Online credit form, but a building engineer must review the data and sign off in the designated space on the credit form. You may incur costs based on whether you have in-house personnel qualified to verify the refrigerant calculations or need to use a third party.
Consider these questions when approaching this credit:
- Do you keep records of all refrigerants used in base building systems? Does any of your HVAC equipment or fire suppression systems use CFCs, HCFCs or halons?
- How efficiently does your base building equipment use refrigerants? Do you have a refrigerant management program in place to minimize leakage?
FAQs for LEED-EBOM EAc5
Can a project use default leakage rate values or leakage values specified by the manufacturer for equipment rather than actual leakage rate values based on the credit calculations?
Always use the actual value for the leakage rate of each piece of HVAC equipment in the project building that has more than 0.5 pounds of refrigerant. You can calculate the actual leakage rate values by tracking the amount of additional refrigerant that has been added during the maintenance activities throughout the performance period. Note that if the actual leakage rate of a piece of equipment is less than 0.5% (i.e. 0%), use the minimum default value of 0.5% in your leakage rate calculation instead of the actual leakage rate.
Do small appliances (such as refrigerators and water coolers) that have greater than 0.5 pounds of refrigerant have to be included in order to achieve EAc5?
Yes. If there is no recorded leakage over the last 12 months, you must use 0.5% for the Lr value, which represents the low-end of the allowable range. However, if the equipment is under separate management control (e.g. a refrigerator owned by a tenant), you may use the 10% exemption to exclude that equipment from the credit requirements (up to 10% of the building floor area can be excluded if it is under separate management control).
Legend
- Best Practices
- Gotcha
- Action Steps
- Cost Tip
Before the Performance Period
Expand All
Common refrigerants and their applications are as folllows:
USGBC
Excerpted from LEED 2009 for Existing Buildings: Operations & Maintenance
EA Credit 5: Enhanced refrigerant management
1 Point
Intent
To reduce ozone depletion and support early compliance with the Montreal Protocol while minimizing direct contributions to global climate change1. Climate change refers to any significant change in measures of climate (such as temperature, precipitation, or wind) lasting for an extended period (decades or longer). (U.S. Environmental Protection Agency, 2008) 2.The increase in global average temperatures being caused by a buildup of CO2 and other greenhouse gases in the atmosphere. This temperature change is leading to changes in circulation patterns in the air and in the oceans, which are affecting climates differently in different places. Among the predicted effects are a significant cooling in Western Europe due to changes in the jet stream, and rising sea levels due to the melting of polar ice and glaciers..
Requirements
Option 1
Do not use refrigerants in base building heating, ventilating, air conditioning and refrigeration (HVAC&R) systems.
OR
Option 2
Select refrigerants and heating, ventilating, air conditioning and refrigeration (HVAC&R) that minimize or eliminate the emission of compounds that contribute to ozone depletion and global climate change1. Climate change refers to any significant change in measures of climate (such as temperature, precipitation, or wind) lasting for an extended period (decades or longer). (U.S. Environmental Protection Agency, 2008) 2.The increase in global average temperatures being caused by a buildup of CO2 and other greenhouse gases in the atmosphere. This temperature change is leading to changes in circulation patterns in the air and in the oceans, which are affecting climates differently in different places. Among the predicted effects are a significant cooling in Western Europe due to changes in the jet stream, and rising sea levels due to the melting of polar ice and glaciers.. The base building HVAC&R equipment must comply with the following formula, which sets a maximum threshold for the combined contributions to ozone depletion and global warming potential:
LCGWP + LCODP x 105
≤ 100
Calculation definitions for LCGWP + LCODP x 105 ≤ 100 LCODP = [ODPr x (Lr x Life +Mr) x Rc]/Life LCGWP = [GWPr x (Lr x Life +Mr) x Rc]/Life LCODP: Lifecycle Ozone Depletion Potential (lbCFC11/Ton-Year) LCGWP: Lifecycle Direct Global Warming Potential (lbCO2/Ton-Year) GWPr: Global Warming Potential of Refrigerant (0 to 12,000 lbCO2/lbr) ODPr: Ozone Depletion Potential of Refrigerant (0 to 0.2 lbCFC11/lbr) Lr: Refrigerant Leakage RateThe speed at which an appliance loses refrigerant, measured between refrigerant charges or over 12 months, whichever is shorter. The leakage rate is expressed in terms of the percentage of the appliance's full charge that would be lost over a 12-month period if the rate stabilized. (EPA Clean Air Act, Title VI, Rule 608). (0.5% to 2.0%; default of 2% unless otherwise demonstrated) Mr: End-of-life Refrigerant Loss (2% to 10%; default of 10% unless otherwise demonstrated) Rc: Refrigerant Charge (0.5 to 5.0 lbs of refrigerant per ton of gross ARI rated cooling capacity) Life: Equipment Life (10 years; default based on equipment type, unless otherwise demonstrated)
For multiple types of equipment, a weighted average of all base building HVAC&R equipment must be calculated using the following formula:
∑ ( LCGWP + LCODP x 105 ) x Qunit
≤ 100 ——————————————————————————————
Qtotal
Calculation definitions for [ ∑ (LCGWP + LCODP x 105) x Qunit ] / Qtotal ≤ 100 Qunit = Gross ARI rated cooling capacity of an individual HVAC or refrigeration unit (tons) Qtotal = Total gross ARI rated cooling capacity of all HVAC or refrigeration
Small HVAC units (defined as containing less than 0.5 pounds of refrigerant) and other equipment, such as standard refrigerators, small water coolers and any other cooling equipmentThe equipment used for cooling room air in a building for human comfort. that contains less than 0.5 pounds of refrigerant, are not considered part of the base building system and are not subject to the requirements of this credit.
Do not operate or install fire suppression systems that contain ozone-depleting substances such as CFCsChlorofluorocarbons (CFCs) are a compound of carbon, hydrogen, chlorine and fluorine, once commonly used in refrigeration, that depletes the stratospheric ozone layer., hydrochlorofluorocarbons (HCFCsHydrochlorofluorocarbons (HCFCs) are refrigerants that cause significantly less depletion of the stratospheric ozone layer than chlorofluorocarbons.) or halonsHalons are substances, used in fire-suppression systems and fire extinguishers, that deplete the stratospheric ozone layer..
Potential Technologies & Strategies
Operate the facility without mechanical cooling and refrigeration equipment. Where mechanical cooling is needed, use for the refrigeration cycle base building HVAC &R systems that minimize direct impact on ozone depletion and climate change1. Climate change refers to any significant change in measures of climate (such as temperature, precipitation, or wind) lasting for an extended period (decades or longer). (U.S. Environmental Protection Agency, 2008) 2.The increase in global average temperatures being caused by a buildup of CO2 and other greenhouse gases in the atmosphere. This temperature change is leading to changes in circulation patterns in the air and in the oceans, which are affecting climates differently in different places. Among the predicted effects are a significant cooling in Western Europe due to changes in the jet stream, and rising sea levels due to the melting of polar ice and glaciers.. Select HVAC&R replacement equipment with reduced refrigerant charge and increased equipment life. Maintain equipment to prevent leakage of refrigerant to the atmosphere. Use fire-suppression systems that do not contain HCFCsHydrochlorofluorocarbons (HCFCs) are refrigerants that cause significantly less depletion of the stratospheric ozone layer than chlorofluorocarbons. or halonsHalons are substances, used in fire-suppression systems and fire extinguishers, that deplete the stratospheric ozone layer..
Web Tools
U.S. EPA Significant New Alternatives Policy
SNAP is an EPA program to identify alternatives to ozone-depleting substances. The program maintains up-to-date lists of environmentally friendly substitutes for refrigeration and air-conditioning equipment, solvents, fire-suppression systems, adhesives, coatings, and other substances.
EPA Fire Suppression and Explosion Protection
Provides info on alternatives to halonsHalons are substances, used in fire-suppression systems and fire extinguishers, that deplete the stratospheric ozone layer. in fire suppression systems.
Refrigerant Inventory and Leakage Rate Calculations
Use this worksheet to help track and record information on all building refrigerants, and to calculate refrigerant leakage rates (Lr).
Refrigerant Inventory Data
Check the nameplates on your mechanical equipment, as in this example, for information on refrigerant type and charge.
CFC Phase-Out or Conversion
This template provides a structure for the phase-out or conversion of all HVAC base building systems that used CFC-based refrigerants that contain 0.5 pounds of refrigerant or more.
Sample LEED Online Form
This LEED Online form with sample data and tips demonstrates how to document EAc5.
LEED Online Forms: EBOM-2009 EA
The following links take you to the public, informational versions of the dynamic LEED Online forms for each EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems.-2009 EA credit. You'll need to fill out the live versions of these forms on LEED Online for each credit you hope to earn.
Version 4 forms (newest):
- EAp2: Minimum Energy Peformance
- EAp3: Fundamental Refrigerant Management
- EAc2.1: Commissioning—Investigation & Analysis
- EAc4: Onsite and Offsite Renewable Energy
- EAc5: Enhanced Refrigerant Management
Version 3 forms:
- EAp1: Energy Efficiency Best Mngt. Practices
- EAp2: Minimum Energy Peformance
- EAp3: Fundamental Refrigerant Management
- EAc1: Optimize Energy Performance
- EAc2.1: Commissioning—Investigation & Analysis
- EAc2.2: Commissioning—Implementation
- EAc2.3: Commissioning—Ongoing Commissioning
- EAc3.1: Perf. Measurement—BAS
- EAc3.2: Perf. Measurement—System-Level Monitoring
- EAc4: Onsite and Offsite Renewable Energy
- EAc5: Enhanced Refrigerant Management
- EAc6: Emissions Reduction Reporting
These links are posted by LEEDuser with USGBC's permission. USGBC has certain usage restrictions for these forms; for more information, visit LEED Online and click "Sample Forms Download."
LEEDuser is produced by BuildingGreen, Inc., with YR&G authoring most of the original content. LEEDuser enjoys ongoing collaboration with USGBC.
31 Comments
Leakage Rate in v5 Form
My understanding is that the minimum acceptable Leakage RateThe speed at which an appliance loses refrigerant, measured between refrigerant charges or over 12 months, whichever is shorter. The leakage rate is expressed in terms of the percentage of the appliance's full charge that would be lost over a 12-month period if the rate stabilized. (EPA Clean Air Act, Title VI, Rule 608). is 0.5%, even if the actual data demonstrate a lower leakage rate. The v4 form accommodated this by allowing the Lr to be manually entered but the v5 form only auto-calculates the Lr based on the amount of refrigerant added. If I have units that have not had any refrigerant added within the past year, how can I use a leakage rate that LEED accepts while still reporting accurate data on refrigerant added? Has anyone else experienced this problem?
End of Life MR Leakage rate
The end of life refrigerant loss (MR) has a range of 2%-10%. The reference guide says I can use a lower than the 10% default rate if I can demonstrate how the lower rate is justified. How would I go about trying to justify the use of a lower end of life leakage rateThe speed at which an appliance loses refrigerant, measured between refrigerant charges or over 12 months, whichever is shorter. The leakage rate is expressed in terms of the percentage of the appliance's full charge that would be lost over a 12-month period if the rate stabilized. (EPA Clean Air Act, Title VI, Rule 608). instead of the 10% default when the equipment is only half way through its anticipated life?
Currently actual leakage rate over 12 years is 0.38%
I haven't seen a project try this but it seems like you would need to provide information from your vendor regarding their procedures to minimize refrigerant leakage at the end of life include recovering and recycling the refrigerant.
In addition, you would likely need some sort of evidence that the vendor had achieved the proposed alternative end of life leakage rateThe speed at which an appliance loses refrigerant, measured between refrigerant charges or over 12 months, whichever is shorter. The leakage rate is expressed in terms of the percentage of the appliance's full charge that would be lost over a 12-month period if the rate stabilized. (EPA Clean Air Act, Title VI, Rule 608). for a similar piece of equipment before.
2% leakage rate
Since there has been some discussion on this topic on this forum before, I wanted to make sure everyone is aware of the 11/1/11 LEED addendum stating that "If new equipment is being installed, use a default leakage rateThe speed at which an appliance loses refrigerant, measured between refrigerant charges or over 12 months, whichever is shorter. The leakage rate is expressed in terms of the percentage of the appliance's full charge that would be lost over a 12-month period if the rate stabilized. (EPA Clean Air Act, Title VI, Rule 608). of 2%."
Good point Tristan.
This is also stated on the EAc5 Credit Template on LEED Online. Speaking from experience it is recommended to read every word of the template you are assigned to complete.
How is "new equipment" defined? If we have equipment installed in 2007 and have not added refrigerant since then, can we use a Lr of 0.5% or is it still "new" with a Lr of 2.0%?
New equipment is probably defined as equipment that has been installed less than a year from project submission date. This equipment does not have a year of annual leakage established therefore the default Lr of 2% is required.
District Energy Documentation
Could someone please confirm the guidance and documentation for projects connected to a third party district chilled water loop? Does the utility (chilled water provider) have to provide any information? These two sources seem to contradict themselves
Guidance from LEED District Energy Addendum
"Scenario 2 – Third Party DES
EAp3 and EAc5 requirements apply to the downstream equipmentDownstream equipment consists of all heating or cooling systems, equipment, and controls located within the project building and site associated with transporting thermal energy into heated or cooled spaces. This includes the thermal connection or interface with the district energy system, secondary distribution systems in the building, and terminal units. but not the upstream equipmentUpstream equipment consists of all heating or cooling systems, equipment, and controls that are associated with a district energy system but are not part of the project building's thermal connection or do not interface with the district energy system. It includes the central energy plant and all transmission and distribution equipment associated with transporting the thermal energy to the project building and site.."
Guidance from 2009 EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems. Reference Guide
"For buildings connected to an existing chilled water system, the chilled water supplier must perform the required calculation and submit a letter showing compliance with the requirements."
Thank you!
Since the district energy document came out more recently than the Reference Guide, and since the Reference Guide implementation guidance is not as strictly upheld as actual credit language, I would think that that DES guidance trumps the Reference Guide.
Does that make sense? If that's not enough to go on, there is an email address in the DES document where feedback is invited—I would send a note there, and also to GBCI.
FYI for those who were confused about the two sources from USGBC related to DES. This is a response from GBCI....
The guidance on page 4 in the more recent document, Treatment of District or Thermal Energy in LEED for Existing Buildings Operations & Maintenance, should take precedence in this case, although following the original approach from page 218 of the LEED Reference Guide for Green Building Operations & Maintenance, 2009 Edition, would also be acceptable and would better respond to the intent of the credit, especially in the case where no other base building systems use refrigerants.
If you are attempting this credit prior to clarification of this matter, you should include this correspondence with your submittal.
refrigerant charge formula for r123
Our supplier who does the recharging of refrigerants has a standard formula for determining the refrigerant charge based on minutes per day of purge pump out operation. The values end up being very small fractions (0.0000n). Are these figures realistic and is this methodology acceptable to LEED?
We have other equipment though that do not use this refrigerant.
In this case do we use 0.5% as minimum default value?
Hoping for some clarification.
I think you're asking about the leakage rateThe speed at which an appliance loses refrigerant, measured between refrigerant charges or over 12 months, whichever is shorter. The leakage rate is expressed in terms of the percentage of the appliance's full charge that would be lost over a 12-month period if the rate stabilized. (EPA Clean Air Act, Title VI, Rule 608). that is used in the EAc5 calculation. If that is correct then the data points that are used in the Credit Form calculator are (1) total pounds of refrigerant added and (2) days since refrigerant was last added.
If the service provider does not track those two data points and uses another methodology like you've described above, then you should submit a narrative along with the credit submission demonstrating that their methodology provides the actual leakage rate over the performance period. This is very important because the credit cannot be earned unless the building team has monitored the actual leakage rates.
If the actual leakage rate is less than 0.5%, you should still enter 0.5% in the credit form as that is the minimum that the review team will accept.
Halon fire extinguishers
For a large building, we just found out we have a few older "halon" fire extinguishers--one (Halotron) in the Electronic Media Services main equipment room, two in the Communications room, and one in attic stock. I do not think replacing those 4 extinguishers will happen soon since since the client is very concerned that non-halon FEs in those rooms will damage the equipment. Will this be a fatal problem for EAc5? Can we commit to a phase out ofver time to a green product like Inergen or another refrigerant, or does the change have to be done before LEED submittal? Thanks again.
Just based on the credit requirements, I would assume that the change would have to be complete by the LEED submittal. A phase-out plan would be more of a prerequisite-type of approach. For the credit, I think you'd hard-pressed to argue for this allowance.
Vending Machines
We have a number of refrigerated vending machines on our facility that are not owned or operated by the building owner. We could not read any nameplates due to installation and safety concerns. These are standard drink machines. Does any one know if these typically carry more than the 0.5lb requirement? And do they need to be included in all refrigerant management calcs?
Thank you.
Laura - I'm not an expert on refrigerants, but I do think its reasonable to assume that vendor-owned machines of this type are clearly not part of 'base-building systems' and can be excluded from consideration for this credit.
Mechanical Engineer Signature Required?
I (not a mechanical engineer) calculated the leakage rates for this credit, but LEED online has a 'Required Signatory' box for this credit. Is this necessary to be signed off on?
Yes, it is. Is there a mechanical engineer on the project team in any function? If not, I'm just thinking out loud, but I wonder if you could sign that given that you are acting in that role for this project. I would think so, but not sure.
Installation Dates for LEED On-line
Good day everyone. For our project site we have listed all of the units,
calculated all of the leakage rates, etc. However there are a few of our units that do not have an accurate (precise day/month/year) installation date - and no one around the place can be more specific than month/year for most. Unfortunately even many of the equipment plates lack the date info. Will this be problematic if we can't document installation dates precisely?
Doesn't seem like it should be too problematic, since it doesn't directly reflect on the credit requirements. I would be sure to explain the lack of the data in as detailed a manner as possible in the narrative.
base bldg equipment vs tenant equipment
EAc5 states that it is for 'base bldg' equipment and I have read their definition of base bldg as meaning permanently attached to the bldg, etc.
I think that means that, in a multi-tenant office building , tenant-owned HVAC or refrigeration equipment is excluded
Do you agree ?
Stephen, for this credit LEED defines "base building" equipment as basically anything in the building with more than 0.5 pounds of refrigerant. This is defined and discussed in detail in the Checklists tab above and on page 209 of the EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems. Reference Guide.
Under Equipment location - the drop down menu states 'The LEED Project only' or 'Central Plant', I'm assuming if the equipment is within the building to put 'The LEED Project Only'?
Yeup. :)
Dealing with CFCs
I have York Chillers which are used very rarely and only under extreme hot weather conditions, requiring additional cooling.
Unfortunately these Chillers still use R-11 CFC Refrigerant. They also fall under the criteria of Conversion would not make it Economically Feasable to convert. Including all the supporting documentation for annual controlling leak rate of 5% or less.
Does this mean we get kicked to the curb on this one and thers no way we can qualify. Or is it automatically excepted considering it meets E.A. Preq.3 requirement guidelines for CFC based refrigerants.
Please advise - Rey
I think you're kicked to the curb. I was going to suggest entering your numbers in the template and seeing if it were less than 100. However, when I tried it under an EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems. 2008 template, R-11 wasn't even a choice on the drop down menu. I suspect that you could still work the formula by hand (the template normally does it for you) but with R-11 your total will be more than 100.
Leakage Rate
90% of the AC equipment at my building has been replaced in the past 2 years. None of that equipment has had refrigerant recharges. How would I go about entering a leakage rateThe speed at which an appliance loses refrigerant, measured between refrigerant charges or over 12 months, whichever is shorter. The leakage rate is expressed in terms of the percentage of the appliance's full charge that would be lost over a 12-month period if the rate stabilized. (EPA Clean Air Act, Title VI, Rule 608). if we have yet to have any refrigerant recharges?
Thanks for the help!
See page 215 of the LEED Reference Guide for the calculations definitions and minimum value for the annual leakage rateThe speed at which an appliance loses refrigerant, measured between refrigerant charges or over 12 months, whichever is shorter. The leakage rate is expressed in terms of the percentage of the appliance's full charge that would be lost over a 12-month period if the rate stabilized. (EPA Clean Air Act, Title VI, Rule 608).. My understanding was that, at a minimum, the annual leakage rate of not less than 0.5% must be used.
LEED ONLINE CALCULATIONS ISSUE?:
I am confused with the formulas given in the reference guide. The 3 examples given takes the sum of the (LCGWP + LCODP * 10^5) * N * Qunit and divides it by the Qtotal to get the value of less than 100. But in the formula listed next to Avg. Reg. Atmos. Impact in the 3 charts it ignores the N-value.
My project has multiple pieces of equipment so I have to take an average the formula on page 222 confuses me as the Qunit value differs by unit, I assumed the average of the total would have to be less than 100.
Also the LEED Online tool does not provide an average score it only sums up the totals of 3 columns. I dont see an area with a final avg. refrig. atmos. impact score.
Could someone help me out with explaining what I am missing?
Hi Paul,
The formulas in the reference guide on page 222, are a bit confusing, but they do not ignore the n-value. The n-value is synonymous with the column titled “units” in the first example on page 222. So the n-value (or number of units) is accounted for in both the last column where each type of HVAC equipment is calculated using “n” in the formula; and in the first and second columns where the Qtotal is calculated. This means that both the subtotal and the Qtotal take n-value (or number of units) into consideration. Then you divide the subtotal by the Qtotal to get the Average Refrig. Atmos. Impact Score. Thus n-value is represented as the Qtotal and it’s also included in the calculations to arrive at the numerator in the equation for the Average Refrig. Atmos. Impact Score.
Regarding LEED Online, the second to last column labeled “Refrigerant Impact per ton” shows the Average Refrig. Atmos. Impact Score, for all of the equipment listed, taking n-value into consideration. The final column labeled “Refrigerant Impact Total” is comparable to the subtotal listed in the example charts in the reference guide.
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