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Recommended Practice for an Engineering Analysis for A/C Efficiency Credits
- Ground Vehicle Standard
- J3174_202209
- Revised
Sector:
Issuing Committee:
Language:
English
Scope
Under U.S. GHG and CAFE regulations, manufacturers are required to perform confirmatory testing to validate indirect air conditioning credits (refer to 40 CFR 86.1868-12). The purpose of this SAE Recommended Practice is to provide manufacturers with updated criteria for the 2020 and later model years. This SAE Recommended Practice is also suitable for reporting credit using and Engineering Analysis to the California Air Resources Board (CARB).
This SAE Recommended Practice describes the work done by the IMAC GHG CRP to develop test procedures, publish SAE Standards, and determine performance requirements to demonstrate the performance of A/C technologies from the pre-approved credit menu meeting regulatory requirements.
Also, enclosed in this SAE Recommended Practice are instructions that can be used by vehicle manufacturers in establishing an engineering analysis in lieu of performing the AC17 test on a vehicle which does not incorporate the credit-generating technologies. These procedures for performing an engineering analysis should be sufficient to satisfy the requirements of the regulation to earn credits for indirect A/C technologies from the pre-approved credit menu.
Rationale
This revision updates one of the formulas in one of the reporting templates included in the digital annex, a modification to the scaling limits for the IHX, the addition of the advanced technology air conditioning compressor with a variable crankcase suction valve and adding the “truck” vehicle type when RoK is selected for all templates.
Recommended Content
Topic
Data Sets - Support Documents
No Datasets Available
Issuing Committee
Interior Climate Control Vehicle OEM Committee
The Interior Climate Control OEM Committee is responsible for developing and maintaining SAE Standards, Recommended Practices, and Information Reports that serve as guidelines for technicians who service mobile air conditioning systems and operate refrigerant recycling equipment as it applies to automobiles, light trucks and other vehicles with similar R12 systems. Participants in the SAE Interior Climate Control Standards Committee include OEMs, suppliers, consulting firms, government, and other interested parties.
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