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Application of Intermediate Vapor Bypass to Mobile Heat Pump System: Extending Operating Range to Lower Ambient Temperature with Low Pressure Low GWP Fluid
Technical Paper
2018-01-0071
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
With market share of electric vehicles continue to grow, there is an increasing demand of mobile heat pump for cabin climate control, as it has much higher energy efficiency when compared to electric heating and helps to cut drive range reduction. One big challenge of heat pump systems is that their heating capacities drop significantly when operating at very low ambient temperature, especially for those with low pressure refrigerants. This paper presents a way to improve low ambient temperature heating performance by using intermediate vapor bypass with the outdoor heat exchanger, which works as an evaporator in heat pump mode. The experimental results show a 35% increase of heating capacity at −20 °C ambient with the improved system as compared to the baseline, and heating performance factor also slightly increased when the system is working at higher ambient temperature to reach the same heating capacity as the baseline. Further improvement of system design and heat exchanger optimization is underway.
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Feng, L. and Hrnjak, P., "Application of Intermediate Vapor Bypass to Mobile Heat Pump System: Extending Operating Range to Lower Ambient Temperature with Low Pressure Low GWP Fluid," SAE Technical Paper 2018-01-0071, 2018, https://doi.org/10.4271/2018-01-0071.Data Sets - Support Documents
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References
- Feng , L. and Hrnjak , P. Experimental Study of an Air Conditioning-Heat Pump System for Electric Vehicles SAE Technical Paper 2016-01-0257 2016 10.4271/2016-01-0257
- Feng , L. , and Hrnjak , P. 2018-01-0054 2018
- Bullard , C.W. , Yin , J.M. , and Hrnjak , P.S. 2 2000
- Elbel , S. and Hrnjak , P. Flash Gas Bypass for Improving the Performance of Transcritical R744 Systems that Use Microchannel Evaporators International Journal of Refrigeration 27 724 735 2004
- Tuo , H. and Hrnjak , P. Flash Gas Bypass in Mobile Air Conditioning System with R134a International Journal of Refrigeration 35 1869 1877 2012
- Li , J. and Hrnjak , P. Separation in Condensers as a Way to Improve Efficiency International Journal of Refrigeration 79 1 9 2017 10.1016/j.ijrefrig.2017.03.017
- Li , J. and Hrnjak , P. Improvement of Condenser Performance by Phase Separation Confirmed Experimentally and by Modeling International Journal of Refrigeration 78 60 69 2017 10.1016/j.ijrefrig.2017.03.018
- Pottker , G. and Hrnjak , P. Experimental Investigation of the Effect of Condenser Subcooling in R134a And R1234yf Air-Conditioning Systems with and without Internal Heat Exchanger International Journal of Refrigeration 50 104 113 2015
- Hiroki , M.K. , Yasushi , Y.N. , Norimasa , B.N. , Michiyasu , Y.C. , et al. 1996
- Feng , L. and Hrnjak , P. Modeling of a Reversible Air Conditioning-Heat Pump System for Electric Vehicles SAE Int. J. Passeng. Cars - Mech. Sys. 9 1 68 74 2016 10.4271/2016-01-0261
- Feng , L. and Hrnjak , P. Refrigerant Charge Imbalance in a Mobile Reversible Air Conditioning-Heat Pump System SAE Technical Paper 2017-01-0177 2017 10.4271/2017-01-0177
- SAE International Surface Vehicle Standard 2008