Experimental investigation on combustion characteristics of flammable refrigerant R290/R1234yf leakage from heat pump system for electric vehicles
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- Kang Li
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, People's Republic of China
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- Jingwu Wang
- Hefei Institute for Public Safety Research, Tsinghua University, Hefei, Anhui 230601, People's Republic of China
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- Shuxian Luo
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, People's Republic of China
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- Zhenzhen Wang
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, People's Republic of China
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- Xuejin Zhou
- College of Mechanical Engineering and Automation, Huaqiao University, Xiamen, Fujian 361021, People's Republic of China
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- Jun Fang
- State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
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- Lin Su
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, People's Republic of China
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- Ran Tu
- College of Mechanical Engineering and Automation, Huaqiao University, Xiamen, Fujian 361021, People's Republic of China
抄録
<jats:p>Concerning the issues regarding driving mileage reduction for electric vehicles (EVs) in cold climates, a heat pump system with low global warming potential refrigerant R290/R1234yf is employed as one of the promising solutions. Different from the widely used mobile refrigerant R134a, R290 and R1234yf are both flammable or explosive. The application of R290/R1234yf in the mobile heat pump system is hindered by unexpected refrigerant leakage with the existence of fire and explosion risk. In this study, the combustion characteristics of R290/R1234yf in a potential leakage process from an air-conditioning heat pump system for EVs were investigated. Firstly, thermodynamic behaviours of R290/R1234yf used in a typical heat pump system were analysed based on a special experimental facility designed for EVs. Then the leakage and combustion characteristics of R290/R1234yf including flame shape, temperature, radiation etc. were obtained by the experimental method under different initial temperature and mass flow rate conditions. It was found that R290/R1234yf leaked is difficult to ignite at low temperatures, while the blow-off phenomenon of the jet flame would occur at high temperature with high leakage mass flow rate. In addition, the results showed that combustion intensity would be enhanced by the leakage mass flow rate between 30 and 60°C. These results could provide guidance for fire detection and rescue system design for new energy vehicles.</jats:p>
収録刊行物
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- Royal Society Open Science
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Royal Society Open Science 7 (4), 191478-, 2020-04
The Royal Society