Startup and defrosting dynamic characteristics of the heat pump and its influence on horizontal scroll compressor reliability of high-speed train
The heat pump is a crucial technology for reducing the energy consumption of air conditioning systems in high-speed trains. This paper experimentally investigates the startup and defrosting processes to evaluate potential reliability issues. Results indicate that, during startup, excessive refrigera...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-02-01
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| Series: | Case Studies in Thermal Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X24017635 |
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| author | Che Wang Qihang Wu Jie Zhang Zhaodong Zhang Jianhua Wu |
| author_facet | Che Wang Qihang Wu Jie Zhang Zhaodong Zhang Jianhua Wu |
| author_sort | Che Wang |
| collection | DOAJ |
| description | The heat pump is a crucial technology for reducing the energy consumption of air conditioning systems in high-speed trains. This paper experimentally investigates the startup and defrosting processes to evaluate potential reliability issues. Results indicate that, during startup, excessive refrigerant condensation in the cold compressor shell increases the oil sump level and lowers oil viscosity due to refrigerant dilution. These issues become more severe at lower ambient temperatures. During the defrosting process, a rapid decrease in discharge pressure causes the refrigerant to separate from the oil, significantly reducing the oil level. The low oil level period during defrosting is also extended at lower ambient temperatures, potentially leading to insufficient oil supply to the bearings. Since both oil viscosity and supply are crucial for the long-term reliable operation of the compressor, preheating and increasing the oil amount are suggested to improve the reliability of the heat pump. |
| format | Article |
| id | doaj-art-4199e1f1f1a14781a6338c4167a1609b |
| institution | Kabale University |
| issn | 2214-157X |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj-art-4199e1f1f1a14781a6338c4167a1609b2025-02-02T05:27:18ZengElsevierCase Studies in Thermal Engineering2214-157X2025-02-0166105732Startup and defrosting dynamic characteristics of the heat pump and its influence on horizontal scroll compressor reliability of high-speed trainChe Wang0Qihang Wu1Jie Zhang2Zhaodong Zhang3Jianhua Wu4School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, 710049, PR China; Corresponding author.School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, 710049, PR ChinaCRRC Xi'an YongeJieTong Electric Co., Ltd, Xi’an, 710049, PR ChinaSchool of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, 710049, PR ChinaSchool of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, 710049, PR China; Corresponding author.The heat pump is a crucial technology for reducing the energy consumption of air conditioning systems in high-speed trains. This paper experimentally investigates the startup and defrosting processes to evaluate potential reliability issues. Results indicate that, during startup, excessive refrigerant condensation in the cold compressor shell increases the oil sump level and lowers oil viscosity due to refrigerant dilution. These issues become more severe at lower ambient temperatures. During the defrosting process, a rapid decrease in discharge pressure causes the refrigerant to separate from the oil, significantly reducing the oil level. The low oil level period during defrosting is also extended at lower ambient temperatures, potentially leading to insufficient oil supply to the bearings. Since both oil viscosity and supply are crucial for the long-term reliable operation of the compressor, preheating and increasing the oil amount are suggested to improve the reliability of the heat pump.http://www.sciencedirect.com/science/article/pii/S2214157X24017635Heat pumpRefrigerant condensationScroll compressorReliability |
| spellingShingle | Che Wang Qihang Wu Jie Zhang Zhaodong Zhang Jianhua Wu Startup and defrosting dynamic characteristics of the heat pump and its influence on horizontal scroll compressor reliability of high-speed train Case Studies in Thermal Engineering Heat pump Refrigerant condensation Scroll compressor Reliability |
| title | Startup and defrosting dynamic characteristics of the heat pump and its influence on horizontal scroll compressor reliability of high-speed train |
| title_full | Startup and defrosting dynamic characteristics of the heat pump and its influence on horizontal scroll compressor reliability of high-speed train |
| title_fullStr | Startup and defrosting dynamic characteristics of the heat pump and its influence on horizontal scroll compressor reliability of high-speed train |
| title_full_unstemmed | Startup and defrosting dynamic characteristics of the heat pump and its influence on horizontal scroll compressor reliability of high-speed train |
| title_short | Startup and defrosting dynamic characteristics of the heat pump and its influence on horizontal scroll compressor reliability of high-speed train |
| title_sort | startup and defrosting dynamic characteristics of the heat pump and its influence on horizontal scroll compressor reliability of high speed train |
| topic | Heat pump Refrigerant condensation Scroll compressor Reliability |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X24017635 |
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