Investigation on the Influence of Refrigerant Charge Amount on the Cooling Performance of Air Conditioning Heat Pump System for Electric Vehicles

Li, Kang; Lan, Jiao; Zhou, Guoliang; Tang, Qitian; Cheng, Qia; Fang, Yidong

doi:10.1007/s11630-018-1056-6

Cited by 20 publications

(4 citation statements)

References 14 publications

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“…So far, no research publications have been found that discuss the effect of system evacuation duration on AC performance. Instead of system evacuation, the studies of the effect of refrigerant charge have been conducted for decades [6][7][8][9]. In textbooks on refrigeration and air conditioning, it is only explained that an evacuation system up to a certain vacuum level is important to ensure the refrigeration system works well.…”

Section: Introductionmentioning

confidence: 99%

Performance of a room air conditioner under varied duration of system evacuation

Simbolon,

Najmudin,

Setyawan

et al. 2023

E3S Web Conf.

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Refrigeration system evacuation is one of the most important steps in achieving refrigeration or air conditioning system quality. This procedure is used to remove water vapor and non-condensable gas from the pipeline and the heat exchangers that can be dangerous for a vapor compression refrigeration system. In this paper, the performance of an air conditioner (AC) was experimentally tested under varied duration of system evacuation from 0 to 60 minutes with an increment of 15 minutes. Cooling capacity, power consumption, and coefficient of performance were tested in accordance with ISO 5151 and ISO 16358-1. Generally, the ISO 16358-1 gives the lower power consumption and higher cooling capacity and coefficient of performance. ISO 16358-1 test results in 12.8% lower power consumption than that of ISO 5151. On the contrary, ISO 16358-1 test gives higher cooling capacity and coefficient of performance by 11.5% and 6.2%, respectively. It is also observed from this study that the longest evacuation period results in the most efficient operation, thus providing less effect on climate change and less environmental impact. However, it should be observed in a longer period of operation.

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Section: Introductionmentioning

confidence: 99%

Performance of a room air conditioner under varied duration of system evacuation

Simbolon,

Najmudin,

Setyawan

et al. 2023

E3S Web Conf.

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“…Either excessive charge or insufficient charge could lead to a decrease of the system heating and cooling performance [20,21]. With an increment of refrigerant charged into system, the superheat decreases and subcooling increases constantly.…”

Section: Introductionmentioning

confidence: 99%

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

Jin

Liu

et al. 2020

Energies

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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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“…After the intersection, the subcooling line would have a short plateau before increase again, and the optimum charge of the system could be determined. For a SL‐ACHP system, the charge determination experiment was conducted by each method introduced in the previous work . The experimental results under cooling mode showed the intersection of subcooling and superheat curves, which was used to determine the critical charge accurately.…”

Section: Introductionmentioning

confidence: 99%

“…For a SL-ACHP system, the charge determination experiment was conducted by each method introduced in the previous work. 16 The experimental results under cooling mode showed the intersection of subcooling and superheat curves, which was used to determine the critical charge accurately. The charge determination experiment is always conducted after the ACHP experiment system is set up and the leakage of the system is eliminated.…”

Section: Introductionmentioning

confidence: 99%

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

Lan

et al. 2019

Int J Energy Res

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Summary Automotive air‐conditioning heat pump systems are particular interest worldwide in energy conservation and emission reduction for electric vehicles, hybrid electric vehicles, and fuel cell electric vehicles. Refrigerant charge amount is a key factor for the air‐conditioning heat pump system optimization affecting the condensing pressure and subcooling in both heating and cooling modes. In this paper, the influence of the refrigerant charge on system performances was investigated using the experiment method on a secondary loop air‐conditioning heat pump system. The typical heat transfer and flow parameters were recorded, and both cooling and heating performances of the system were investigated and illustrated by pressure‐enthalpy diagrams. The critical refrigerant charges were determined in both heating and cooling modes. Three typical void fraction correlation models were also applied for the refrigerant charge determination modeling as a system off‐design method. Results show that the Hughmark void fraction correlation method has the best prediction of the critical refrigerant charge in both cooling and heating modes.

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Investigation on the Influence of Refrigerant Charge Amount on the Cooling Performance of Air Conditioning Heat Pump System for Electric Vehicles

Cited by 20 publications

References 14 publications

Performance of a room air conditioner under varied duration of system evacuation

Performance of a room air conditioner under varied duration of system evacuation

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

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

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