The Improved Mobile Air Conditioning Greenhouse Gas Life Cycle Climate Performance (IMAC-GHG-LCCP) software application estimates the total direct and indirect CO2 emissions for a vehicle’s mobile air conditioning (MAC) system over its lifetime. With this information, automobile manufacturers are able to make evidence-based design modifications, meet applicable standards, and select the most appropriate refrigerants to reduce the emissions of greenhouse gasses. The tool uses an approach similar to the prior automotive LCCP standard (GREEN-MAC-LCCP) but with a focus on simplicity and ease-of-use with a friendly, interactive graphical user interface (GUI).
The new software includes several key improvements, including:
- Simplified User Interface
- Decreased Runtime
- Weather Data Selection Expanded
- Simulation Flexibility
- Equations for Electric Compressors and Water-Based Systems
In addition, OTS developed the IMAC-GHG-LCCP tool under the direction and guidance of SAE International’s Interior Climate Control Steering Committee. The tool meets the requirements of the following standards:
- SAE Standard J2765 – Procedure for Measuring System COP (Coefficient of Performance) of a Mobile Air Conditioning System on a Test Bench was written to describe how energy consumption input data should be collected and used into a life cycle model for MAC systems. Input data has been revised in the IMAC-GHG-LCCP tool to include compressor energy consumption and the COP is calculated internally in the model.
- SAE Standard J2766 – Life Cycle Analysis to Estimate the CO2-Equivalent Emissions from MAC Operation describes the recommended inputs and calculations suggested for use in a typical LCCP model for MAC systems. The IMAC-GHG-LCCP tool adheres to the calculation methods prescribed in this standard.
- SAE Standard J2727 – Mobile Air Conditioning System Refrigerant Emission Charts for R-134a and R-1234yf is used as the source for user inputs of leakage rate for each system. This leakage rate is then corrected for the average ambient temperature in each city based on a correlation developed by Clodic.
For more information or to register for SAE International’s WCX 2019, visit http://www.sae.org/wcx
For more information on the IMAC-GHG-LCCP software application, visit OTS at Booth 1636 during the WCX 2019 or visit www.optimizedthermalsystems.com.
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SAE International is a global association committed to be the ultimate knowledge source for the engineering profession. By engaging nearly 200,000 engineers, technical experts and volunteers, we drive knowledge and expertise across a broad spectrum of industries. We act on two priorities: encouraging a lifetime of learning for mobility engineering professionals and setting the standards for industry engineering. We strive for a better world through the work of our philanthropic SAE Foundation, including programs like A World in Motion® and the Collegiate Design Series™.
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