An experimental and theoretical investigation of refrigerant charge on a secondary loop air‐conditioning heat pump system in electric vehicles

2019 ◽  
Vol 43 (8) ◽  
pp. 3381-3398 ◽  
Author(s):  
Kang Li ◽  
Dan Xu ◽  
Jiao Lan ◽  
Lin Su ◽  
Yidong Fang
Keyword(s):  
Heat Pump ◽  
Theoretical Investigation ◽  
Electric Vehicles ◽  
Air Conditioning ◽  
Pump System ◽  
Heat Pump System ◽  
Secondary Loop

scholarly journals A Study of Optimal Refrigerant Charge Amount Determination for Air-Conditioning Heat Pump System in Electric Vehicles

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 657 ◽  
Author(s):  
Kang Li ◽  
Jun Yu ◽  
Mingkang Liu ◽  
Dan Xu ◽  
Lin Su ◽  
...  
Keyword(s):  
Heat Pump ◽  
Electric Vehicles ◽  
Air Conditioning ◽  
Cold Climate ◽  
Operating Conditions ◽  
Pump System ◽  
Heat Pump System ◽  
Heating Performance ◽  
Correlation Models ◽  
Battery Energy

With regard to concerns about an electric vehicle’s driving range extension in a cold climate, an air-conditioning heat pump (ACHP) shows considerable advantage over thermoelectric heaters for battery energy conservation. The effect of refrigerant charge amount for cooling and heating performance of the ACHP system is significant. The optimal charge, realizing the optimal system performance, is usually determined by experiments of cooling and heating performance. In this paper, the optimal charge determination process based on a newly designed ACHP applied in electric vehicles was introduced. Relationships of characteristics with charge in two modes were investigated by experimental and theoretical methods. Firstly, the performance of the ACHP system was respectively investigated at different charge amounts in cooling and heating operating conditions according to key parameters of system cycles. Secondly, the intersection platforms of subcooling and superheat variation curves with refrigerant charge amount were obtained for determining optimal charge amount of the system further by comprehensive analysis. Finally, the theoretical calculation of charge with three instructive and classical void friction correlation models were applied for better comparisons. It was found that charge amount calculated by the Hughmark model proved to be most consistent with the comprehensive experimental results.

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