skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Determining Off-Cycle Fuel Economy Benefits of 2-Layer HVAC Technology

Abstract

This work presents a methodology to determine the off-cycle fuel economy benefit of a 2-Layer HVAC system which reduces ventilation and heat rejection losses of the heater core versus a vehicle using a standard system. Experimental dynamometer tests using EPA drive cycles over a broad range of ambient temperatures were conducted on a highly instrumented 2016 Lexus RX350 (3.5L, 8 speed automatic). These tests were conducted to measure differences in engine efficiency caused by changes in engine warmup due to the 2-Layer HVAC technology in use versus the technology being disabled (disabled equals fresh air-considered as the standard technology baseline). These experimental datasets were used to develop simplified response surface and lumped capacitance vehicle thermal models predictive of vehicle efficiency as a function of thermal state. These vehicle models were integrated into a database of measured on road testing and coupled with U.S. typical meteorological data to simulate vehicle efficiency across seasonal thermal and operational conditions for hundreds of thousands of drive cycles. Fuel economy benefits utilizing the 2-Layer HVAC technology are presented in addition to goodness of fit statistics of the modeling approach relative to the experimental test data.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2];  [3];  [3];  [4]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  2. Argonne National Laboratory
  3. Toyota Motor North America R&D
  4. DENSO International America Inc.
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
OSTI Identifier:
1433596
Report Number(s):
NREL/CP-5400-70780
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at WCX 18: SAE World Congress Experience, 10-12 April 2018, Detroit, Michigan
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; real-world fuel economy; cabin heating; 2-layer technology; off-cycle credits

Citation Formats

Wood, Eric W, Moniot, Matthew, Jehlik, Forrest, Chevers, Netsanet, Hirabayshi, Hidekazu, and Song, Yuanpei. Determining Off-Cycle Fuel Economy Benefits of 2-Layer HVAC Technology. United States: N. p., 2018. Web. doi:10.4271/2018-01-1368.
Wood, Eric W, Moniot, Matthew, Jehlik, Forrest, Chevers, Netsanet, Hirabayshi, Hidekazu, & Song, Yuanpei. Determining Off-Cycle Fuel Economy Benefits of 2-Layer HVAC Technology. United States. doi:10.4271/2018-01-1368.
Wood, Eric W, Moniot, Matthew, Jehlik, Forrest, Chevers, Netsanet, Hirabayshi, Hidekazu, and Song, Yuanpei. Tue . "Determining Off-Cycle Fuel Economy Benefits of 2-Layer HVAC Technology". United States. doi:10.4271/2018-01-1368. https://www.osti.gov/servlets/purl/1433596.
@article{osti_1433596,
title = {Determining Off-Cycle Fuel Economy Benefits of 2-Layer HVAC Technology},
author = {Wood, Eric W and Moniot, Matthew and Jehlik, Forrest and Chevers, Netsanet and Hirabayshi, Hidekazu and Song, Yuanpei},
abstractNote = {This work presents a methodology to determine the off-cycle fuel economy benefit of a 2-Layer HVAC system which reduces ventilation and heat rejection losses of the heater core versus a vehicle using a standard system. Experimental dynamometer tests using EPA drive cycles over a broad range of ambient temperatures were conducted on a highly instrumented 2016 Lexus RX350 (3.5L, 8 speed automatic). These tests were conducted to measure differences in engine efficiency caused by changes in engine warmup due to the 2-Layer HVAC technology in use versus the technology being disabled (disabled equals fresh air-considered as the standard technology baseline). These experimental datasets were used to develop simplified response surface and lumped capacitance vehicle thermal models predictive of vehicle efficiency as a function of thermal state. These vehicle models were integrated into a database of measured on road testing and coupled with U.S. typical meteorological data to simulate vehicle efficiency across seasonal thermal and operational conditions for hundreds of thousands of drive cycles. Fuel economy benefits utilizing the 2-Layer HVAC technology are presented in addition to goodness of fit statistics of the modeling approach relative to the experimental test data.},
doi = {10.4271/2018-01-1368},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {4}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: