Experimental Study of an Air-Conditioning System in an Electric Vehicle with R1234yf

Jeonghyun Song, Seongyong Eom, Jaeseung Lee, Youngshin Chu, Jaewon Kim, Seohyun Choi, Minsung Choi, Gyungmin Choi () and Yeseul Park ()
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Jeonghyun Song: School of Mechanical Engineering, Pusan National University, Busan 46241, Republic of Korea
Seongyong Eom: School of Mechanical Engineering, Pusan National University, Busan 46241, Republic of Korea
Jaeseung Lee: R&D Division, KORENS, Yangsan 50591, Republic of Korea
Youngshin Chu: R&D Division, KORENS, Yangsan 50591, Republic of Korea
Jaewon Kim: R&D Division, KORENS, Yangsan 50591, Republic of Korea
Seohyun Choi: R&D Division, KORENS, Yangsan 50591, Republic of Korea
Minsung Choi: Department of Automotive Engineering, Gangneung-Wonju National University, Wonju 26403, Republic of Korea
Gyungmin Choi: School of Mechanical Engineering, Pusan National University, Busan 46241, Republic of Korea
Yeseul Park: School of Convergence Science, Pusan National University, Busan 46241, Republic of Korea

Energies, 2023, vol. 16, issue 24, 1-13

Abstract: R134a, a vehicle refrigerant used in the vehicle heat pump system, is regulated according to the Montreal Protocol. Refrigerants such as R1234yf, R744, and R290 in vehicle heat pump systems are being investigated to identify their alternatives. Because developing a new system exclusively for new refrigerants is costly, an empirical test was conducted on the R1234yf refrigerant in a heat pump system designed for the R134a refrigerant in an actual vehicle system. The heating, cooling, and battery-cooling modes were tested for the amount of refrigerant charge, and operability tests were conducted for the compressor load; heating, ventilation, air conditioning (HVAC) air flow rate; coolant temperature; and flow rate of each mode. The optimal refrigerant charge in heating mode was 0.7 kg, and the optimal refrigerant charge in the cooling and battery-cooling modes was 0.9 kg. To yield the highest coefficient of performance of the system, the compressor load was 50%, the HVAC fan was 12 V, and the coolant flow rate was 10 LPM. The most efficient system operation was possible at a coolant temperature of 30 °C in the cooling and heating modes and at 20 °C in battery-cooling mode.

Keywords: automotive heat pump; R1234yf; electric vehicle; empirical test; performance analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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