Optimal operating characteristics for trans-critical CO2 heat pump of new energy vehicles under different control strategies

doi:10.3969/j.issn.1674-8484.2022.04.018

Abstract

Abstract:

For the transcritical CO₂ automotive heat pump system, the main factors affecting the optimal discharge pressure were investigated under different control strategies. The simulation model was established based on the GT-Suite simulation platform and calibrated with experimental data of heat production performance. A constant supply air temperature was used to constrain the heating capacity. The optimal discharge pressure was simulated numerically at different ambient temperatures, different supply air temperatures and different air volumes, and then compared with the constant speed control mode. The results show that there is no optimal discharge pressure in the constant speed control mode; the optimal discharge pressure increases with increasing indoor air volume, increasing ambient temperature and increasing outlet air temperature in the constant supply air control mode. The air supply temperature affects the optimal discharge pressure variation by 13.09%; the ambient temperature affects the optimal discharge pressure variation by 9.64%; the air volume affects the optimal discharge pressure variation by 5.95%. The optimal discharge pressure correlation formula is proposed based on the simulation data.

Key words: electric vehicles, CO₂ heat pump, operating characteristics, optimal discharge pressure, simulation model

CLC Number:

U469.72

JIA Fan, WANG Anci, YIN Xiang, CAO Feng, LIU Hecheng. Optimal operating characteristics for trans-critical CO₂ heat pump of new energy vehicles under different control strategies[J]. Journal of Automotive Safety and Energy, 2022, 13(4): 770-777.

Figures/Tables 12

References 23

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部件名称	部件几何参数
压缩机	6.8 mL
辅助换热器	156 mm×142 mm×32 mm
气体冷却器	218 mm×200 mm×38 mm
蒸发器	600 mm×300 mm×20 mm
气液分离器	0.5 L

部件名称	部件几何参数
压缩机	6.8 mL
辅助换热器	156 mm×142 mm×32 mm
气体冷却器	218 mm×200 mm×38 mm
蒸发器	600 mm×300 mm×20 mm
气液分离器	0.5 L

位置	θ_am / ℃	RH / %	q_V / (m³·h^-1)	p_out / MPa
室外侧	-10~10	50	2 500	7.6~10
室内侧	42~50	50	240~420	7.6~10

位置	θ_am / ℃	RH / %	q_V / (m³·h^-1)	p_out / MPa
室外侧	-10~10	50	2 500	7.6~10
室内侧	42~50	50	240~420	7.6~10

Optimal operating characteristics for trans-critical CO₂ heat pump of new energy vehicles under different control strategies

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