Coupling Effect of Air Flow Rate and Operating Conditions on the Performance of Electric Vehicle R744 Air Conditioning System
The air flow rate on the gas cooler side is one of the key parameters affecting the performance and running safety of transcritical CO<sub>2</sub> electric vehicle air conditioning systems. After experimentally analyzing the effects of the air volume flow rate in the gas cooler on the cy...
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MDPI AG
2021-05-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/11/4855 |
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| author | Anci Wang Jianmin Fang Xiang Yin Yulong Song Feng Cao Paride Gullo |
| author_facet | Anci Wang Jianmin Fang Xiang Yin Yulong Song Feng Cao Paride Gullo |
| author_sort | Anci Wang |
| collection | DOAJ |
| description | The air flow rate on the gas cooler side is one of the key parameters affecting the performance and running safety of transcritical CO<sub>2</sub> electric vehicle air conditioning systems. After experimentally analyzing the effects of the air volume flow rate in the gas cooler on the cycle parameters and system performance, a novel method to evaluate the optimal air flow rate was proposed. In addition, the effect of the gas cooler air volume flow rate on the key performance parameters of the system (e.g., optimal discharge pressure) was explored. Finally, the coupling effects of the compressor speed, ambient temperature and optimal air flow rate on the system performance was also exhaustively assessed. It was found that as the discharge temperature, the CO<sub>2</sub> temperature at the gas cooler outlet and the discharge pressure did not vary more than ±2%, the corresponding gas cooler air volume flow rate was optimal. For the single-row and dual-process microchannel evaporator used in this work, the recommended value of the optimal gas cooler air volume flow rate was 2500 m<sup>3</sup>·h<sup>−1</sup>. The results could provide reference for the fan speed design of electric vehicle CO<sub>2</sub> air conditioning systems, especially for the performance under idling model. |
| first_indexed | 2024-03-10T11:03:26Z |
| format | Article |
| id | doaj.art-67fc31374e664d90871353f5e2938a51 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T11:03:26Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-67fc31374e664d90871353f5e2938a512023-11-21T21:20:51ZengMDPI AGApplied Sciences2076-34172021-05-011111485510.3390/app11114855Coupling Effect of Air Flow Rate and Operating Conditions on the Performance of Electric Vehicle R744 Air Conditioning SystemAnci Wang0Jianmin Fang1Xiang Yin2Yulong Song3Feng Cao4Paride Gullo5School of Energy and Power Engineering, Xi’an Jiaotong University, 28 Xianning West Road, Xi’an 710049, ChinaSchool of Energy and Power Engineering, Xi’an Jiaotong University, 28 Xianning West Road, Xi’an 710049, ChinaSchool of Energy and Power Engineering, Xi’an Jiaotong University, 28 Xianning West Road, Xi’an 710049, ChinaSchool of Energy and Power Engineering, Xi’an Jiaotong University, 28 Xianning West Road, Xi’an 710049, ChinaSchool of Energy and Power Engineering, Xi’an Jiaotong University, 28 Xianning West Road, Xi’an 710049, ChinaDepartment of Mechanical Engineering, Technical University of Denmark (DTU), Nils Koppels Allé, Building 403, 2800 Kgs. Lyngby, DenmarkThe air flow rate on the gas cooler side is one of the key parameters affecting the performance and running safety of transcritical CO<sub>2</sub> electric vehicle air conditioning systems. After experimentally analyzing the effects of the air volume flow rate in the gas cooler on the cycle parameters and system performance, a novel method to evaluate the optimal air flow rate was proposed. In addition, the effect of the gas cooler air volume flow rate on the key performance parameters of the system (e.g., optimal discharge pressure) was explored. Finally, the coupling effects of the compressor speed, ambient temperature and optimal air flow rate on the system performance was also exhaustively assessed. It was found that as the discharge temperature, the CO<sub>2</sub> temperature at the gas cooler outlet and the discharge pressure did not vary more than ±2%, the corresponding gas cooler air volume flow rate was optimal. For the single-row and dual-process microchannel evaporator used in this work, the recommended value of the optimal gas cooler air volume flow rate was 2500 m<sup>3</sup>·h<sup>−1</sup>. The results could provide reference for the fan speed design of electric vehicle CO<sub>2</sub> air conditioning systems, especially for the performance under idling model.https://www.mdpi.com/2076-3417/11/11/4855CO<sub>2</sub>air flow rateair conditioningelectric vehicletranscritical system |
| spellingShingle | Anci Wang Jianmin Fang Xiang Yin Yulong Song Feng Cao Paride Gullo Coupling Effect of Air Flow Rate and Operating Conditions on the Performance of Electric Vehicle R744 Air Conditioning System Applied Sciences CO<sub>2</sub> air flow rate air conditioning electric vehicle transcritical system |
| title | Coupling Effect of Air Flow Rate and Operating Conditions on the Performance of Electric Vehicle R744 Air Conditioning System |
| title_full | Coupling Effect of Air Flow Rate and Operating Conditions on the Performance of Electric Vehicle R744 Air Conditioning System |
| title_fullStr | Coupling Effect of Air Flow Rate and Operating Conditions on the Performance of Electric Vehicle R744 Air Conditioning System |
| title_full_unstemmed | Coupling Effect of Air Flow Rate and Operating Conditions on the Performance of Electric Vehicle R744 Air Conditioning System |
| title_short | Coupling Effect of Air Flow Rate and Operating Conditions on the Performance of Electric Vehicle R744 Air Conditioning System |
| title_sort | coupling effect of air flow rate and operating conditions on the performance of electric vehicle r744 air conditioning system |
| topic | CO<sub>2</sub> air flow rate air conditioning electric vehicle transcritical system |
| url | https://www.mdpi.com/2076-3417/11/11/4855 |
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