Titov, Eugene | Search NASA

DOE OSTI2017

Advanced Climate System for EV Extended Range

The Kia Soul Battery Electric Vehicle (BEV) is available with either a Positive Temperature Coefficient (PTC) heater or an air-source R134a heat pump with PTC heater combination. Hanon Systems, Hyundai America Technical Center, Inc. (HATCI) and the National Renewable Energy Laboratory (NREL) are jointly, with financial support from the U.S. Department of Energy (DOE), developed and proved-out technologies that extend the driving range of the vehicle while maintaining thermal comfort in cold climates. Improved system configuration concepts that use thermal storage and waste heat recovery more effectively were developed and evaluated. This report reviews the three-year effort, including test data of the baseline and modified vehicles, resulting range extension, and recommendations for future actions.

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATI↗

DOE OSTI2016

MATLAB/Simulink Framework for Modeling Complex Coolant Flow Configurations of Advanced Automotive Thermal Management Systems

The National Renewable Energy Laboratory's (NREL's) CoolSim MATLAB/Simulink modeling framework was extended by including a newly developed coolant loop solution method aimed at reducing the simulation effort for arbitrarily complex thermal management systems. The new approach does not require the user to identify specific coolant loops and their flow. The user only needs to connect the fluid network elements in a manner consistent with the desired schematic. Using the new solution method, a model of NREL's advanced combined coolant loop system for electric vehicles was created that reflected the test system architecture. This system was built using components provided by the MAHLE Group and included both air conditioning and heat pump modes. Validation with test bench data and verification with the previous solution method were performed for 10 operating points spanning a range of ambient temperatures between -2 degrees C and 43 degrees C. The largest root mean square difference between pressure, temperature, energy and mass flow rate data and simulation results was less than 7%.

30 DIRECT ENERGY CONVERSION↗