Add a metric unit column to the first table as follows: Metric units LCGWP + LCODP x 105 = 13 Calculation definitions for LCGWP + LCODP x 105 = 13 (Metric units) 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 (kg CFC 11/(kW/year)) LCGWP: Lifecycle Direct Global Warming Potential (kg CO2/(kW/year)) ODPr: Ozone Depletion Potential of Refrigerant (0 to 0.2 kg CFC 11/kg r) GWPr: Global Warming Potential of Refrigerant (0 to 12,000 kg CO2/kg r) Lr: Refrigerant Leakage Rate (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 (0.065 to 0.65 kg of refrigerant per kW of ARI rated or Eurovent Certified cooling capacity) Life: Equipment Life (default based on equipment type, unless otherwise demonstrated)
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Paul Swierc
CEM, CPMP, BECxP, CxA+BE, EIT, LEED GA
Senior Commissioning Agent
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Credit language
© Copyright U.S. Green Building Council, Inc. All rights reserved.
Requirements
Option 1
Do not use refrigerants.OR
Option 2
Select refrigerants and heating, ventilating, air conditioning and refrigeration (HVAC&R) equipment that minimize or eliminate the emission of compounds that contribute to ozone depletion and climate change. 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: See all forum discussions about this credit »What does it cost?
Cost estimates for this credit
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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.
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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:
Metric units = 13 S ( LCGWP + LCODP x 105 ) x Qunit --------------------------- Qtotal Add the following metric units to the second table in Option 2:
Campus Applicable
No
Internationally Applicable:
Yes
5/9/2011 – Updated: 2/14/2015
Reference Guide Correction
Description of change:
Update equation on bottom of page to read:? (LCGWP + LCODP x 105) x Qunit ? 100 Qtotal
Campus Applicable
No
Internationally Applicable:
No
10/1/2012 – Updated: 2/14/2015
Global ACP
Description of change:
Add the following metric units to the third table: Calculation definitions for [ S (LCGWP + LCODP x 105) x Qunit ] / Qtotal = 13 (Metric units) Qunit = Eurovent Certified cooling capacity of an individual HVAC or refrigeration unit (kW) Qtotal = Total Eurovent Certified cooling capacity of all HVAC or refrigeration (kW)
Campus Applicable
No
Internationally Applicable:
Yes
5/9/2011 – Updated: 2/14/2015
Reference Guide Correction
Description of change:
Replace the two bulleted items with the following:?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
Campus Applicable
No
Internationally Applicable:
No
5/9/2011 – Updated: 2/14/2015
Rating System Correction
Description of change:
Update equation on bottom of page to read:? (LCGWP + LCODP x 105) x Qunit ? 100 Qtotal
Campus Applicable
No
Internationally Applicable:
No
7/1/2016
LEED Interpretation
Inquiry:
Our project is connected to a district energy system which provides both heating and cooling for the building; no additional building-level cooling systems are installed. The district system draws heavily on deep lake cooling with a complement of refrigerant-based cooling. We also have walk-in refrigerators on the premises. We are not permitted to count the deep lake cooling with a refrigerant factor of zero, so because the walk-in refrigerators use refrigerants with a high impact (according to the LEED calculation), we exceed the impact limit of 100 for the credit even though the project?s cooling capacity is largely provided by refrigerant-free sources.
We propose a calculation methodology that demonstrates a design case reduction of the total refrigerant impact as compared to the baseline case:
• The baseline case is calculated by factoring the total cooling capacity of the building?s baseline case and a refrigerant impact of 100 per ton. The demand (during the simulated year) is 1496 kW for the baseline case and 1704 (483,9 tons) installed capacity, as per the EAp2 form and the EA Section 1.4 Tables respectively.
o total design case cooling capacity = 483.9 tons
o total refrigerant impact = 483.9 x 100 = 48390
• The design case factors the labeled capacity on the district energy system?s heat exchanger (district cooling exchanger) and the walk-in refrigerator equipment, and their respective refrigerants.
o total design case cooling capacity = 393.7 tons
o total refrigerant impact = 393.7 x 86 = 33798
• Total reduction in cooling demand = 393.7 / 483.9 = 81.36 (18.64% reduction)
• Total reduction in refrigerant impact = 33798 / 48390 = 69.85 (30.15% reduction)
The calculation confirms that the refrigerant impact reduction is in excess of that associated with the reduced cooling capacity. We would like this to be an ACP.
Ruling:
The applicant proposes an alternate approach to the enhanced refrigerant impact credit which allows credit for the portion of cooling that is provided by systems that contain no refrigerants.
It is acceptable for the applicant to document that the refrigerant impact for the project (including downstream and upstream systems) is less than a refrigerant impact allowance calculated based on the Baseline cooling capacity* from the EAp2: Minimum Energy Performance Baseline energy model. However, the allowance calculated based on the cooling capacity shall be limited to 75 per ton (versus 100 per ton allowed using the compliance path defined in the Rating System Language for Proposed equipment).
To calculate the Baseline case allowance, multiply the total Baseline cooling capacity from the EAp2: Minimum Energy Performance model by a refrigerant impact of 75 per ton (in this case 483.9 x 75 = 36,292).
To calculate the Proposed case refrigerant impact, complete the EAc4: Refrigerant Impact form for the proposed systems (including upstream and on-site equipment). [Note: for upstream equipment, enter the capacity of the upstream equipment by multiplying the equipment capacity by the proportion of building loads to total district energy cooling loads. For example, if the building loads represent 10% of the district energy cooling loads, multiply the capacity of each piece of upstream equipment by 10%].
If the total refrigerant impact for the proposed design (including upstream systems) is less than the Baseline refrigerant impact allowance identified above, the project shall be deemed to comply with this alternative compliance path.
If using this path, please ensure that energy simulation output files showing both the Baseline cooling and refrigeration capacities AND the Baseline cooling and refrigeration peak operating capacities are uploaded either in EAp2: Minimum Energy Performance or in this credit.
* For the purposes of this Alternative Refrigerant Impact calculation, all uncooled spaces must be excluded from the total Baseline cooling capacity reported unless the documentation demonstrates how passive cooling has been achieved for these spaces.
Campus Applicable
No
Internationally Applicable:
Yes
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© Copyright U.S. Green Building Council, Inc. All rights reserved.
Requirements
Option 1
Do not use refrigerants.OR
Option 2
Select refrigerants and heating, ventilating, air conditioning and refrigeration (HVAC&R) equipment that minimize or eliminate the emission of compounds that contribute to ozone depletion and climate change. 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:LEEDuser expert
Paul Swierc
CEM, CPMP, BECxP, CxA+BE, EIT, LEED GA
Senior Commissioning Agent
