Opportunities to Reduce Air-Conditioning Loads through Lower Cabin Soak Temperatures

Research output: Contribution to conferencePaper


Air-conditioning loads can significantly reduce electric vehicle (EV) range and hybrid electric vehicle (HEV) fuel economy. In addition, a new U. S. emissions procedure, called the Supplemental Federal Test Procedure (SFTP), has provided the motivation for reducing the size of vehicle air-conditioning systems in the United States. The SFTP will measure tailpipe emissions with the air-conditioningsystem operating. If the size of the air-conditioning system is reduced, the cabin soak temperature must also be reduced, with no penalty in terms of passenger thermal comfort. This paper presents the impact of air-conditioning on EV range and HEV fuel economy, and compares the effectiveness of advanced glazing and cabin ventilation. Experimental and modeled results are presented.
Original languageAmerican English
Number of pages11
StatePublished - 1999
Event16th Electric Vehicle Symposium - Beijing, China
Duration: 1 Oct 19991 Oct 1999


Conference16th Electric Vehicle Symposium
CityBeijing, China

NREL Publication Number

  • NREL/CP-540-26615


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