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System Characteristics of Direct and Secondary Loop Heat Pump for Electrical Vehicles
Technical Paper
2018-01-0063
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The electricity energy consumption for passenger cabin heating can drastically shorten the driving range for electric vehicles in cold climates. Mobile heat pump system is considered as an effective method to improve heating efficiency. This study investigates the system characteristics of mobile heat pump systems for electrical vehicle application. Based on KULI thermal management software, simulation models including HFC-R134a direct heat pump (DHP) and secondary loop heat pump (SLHP) were developed. The secondary loop employed in the SLHP includes a coolant pump, an indoor heater core and a plate heat exchanger, instead of an indoor condenser in the DHP. The use of a secondary loop has advantages to improve air outlet temperature uniformity. The simulation models were verified by measured data obtained from calorimeter experiments. By adopting simulation models, the effects of indoor and outdoor temperatures on system performance and cycle characteristics were discussed. Results show that the increase of indoor temperature will largely decrease the system efficiency, and varied outdoor temperature has a big impact on heating capacity. Then the comparison simulations between DHP and SLHP were conducted, to determine the effect of the secondary loop on heating performance. Results show that the use of a secondary loop is severely harmful to system efficiency, but has little effect on heating capacity. Furthermore, the impact of coolant flow rate on the capacity and COP was discussed, and heat transfer effectiveness of heater core and plate heat exchanger were also evaluated.
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Wang, D., Gao, T., Li, W., Yang, Y. et al., "System Characteristics of Direct and Secondary Loop Heat Pump for Electrical Vehicles," SAE Technical Paper 2018-01-0063, 2018, https://doi.org/10.4271/2018-01-0063.Data Sets - Support Documents
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References
- Higuchi , Y. , Kobayashi , H. , Shan , Z. , Kuwahara , M. et al. Efficient Heat Pump System for PHEV/BEV SAE Technical Paper 2017-01-0188 2017 10.4271/2017-01-0188
- Lajunen , A. Energy Efficiency and Performance of Cabin Thermal Management in Electric Vehicles SAE Technical Paper 2017-01-0192 2017 10.4271/2017-01-0192
- Qi , Z. Advances on Air Conditioning and Heat Pump System in Electric Vehicles-A Review Renewable and Sustainable Energy Reviews 38 754 764 2014 10.1016/j.rser.2014.07.038
- Ahn , J.H. , Lee , J.S. , Baek , C. et al. Performance Improvement of a Dehumidifying Heat Pump Using an Additional Waste Heat Source in Electric Vehicles with Low Occupancy Energy 115 67 75 2016 10.1016/j.rser.2014.07.038
- Kwon , C. , Mo , S.K. , Choi , Y. et al. Performance Evaluation of a Vapor Injection Heat Pump System for Electric Vehicles International Journal of Refrigeration 74 138 150 2017 10.1016/j.ijrefrig.2016.10.004
- Kowsky , C. , Leitzel , L. , Oddi , F. , and Wolfe , E. Unitary HPAC System-Commercial Vehicle Applications SAE Technical Paper 2012-01-2025 2012 10.4271/2012-01-2025
- Andersen , S. , Chowdhury , S. , Craig , T. , Kapoor , S. et al. Comparative Manufacturing and Ownership Cost Estimates for Secondary Loop Mobile Air Conditioning Systems (SL-MACs) SAE Technical Paper 2017-01-0173 2017 10.4271/2017-01-0173
- Wang , D. , Yu , B. , Hu , J. et al. Heating Performance Characteristics of CO2 Heat Pump System for Electrical Vehicle in a Cold Climate International Journal of Refrigeration 2017 10.1016/j.ijrefrig.2017.09.009
- Moffat , R.J. Describing the Uncertainties in Experimental Results Experimental Thermal & Fluid Science 1 1 3 17 1988 10.1016/0894-1777(88)90043-X