Comparative research on vapor injection heat pump with a novel flash tank
Two major problems for the vapor injection heat pump systems with the flash tank are the high discharge temperature and the lack of flash tank design theoretical basis, which would limit its wide application in extreme operating conditions. One possible way to overcome these problems is to effective...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-06-01
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| Series: | Heliyon |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405844023036927 |
| _version_ | 1797818627105226752 |
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| author | Jinfei Sun Jianxiang Guo Longbin He Shengjun Hou Zhengchang Yu |
| author_facet | Jinfei Sun Jianxiang Guo Longbin He Shengjun Hou Zhengchang Yu |
| author_sort | Jinfei Sun |
| collection | DOAJ |
| description | Two major problems for the vapor injection heat pump systems with the flash tank are the high discharge temperature and the lack of flash tank design theoretical basis, which would limit its wide application in extreme operating conditions. One possible way to overcome these problems is to effectively control the two-phase injection in the flash tank by optimizing its structure. The use of the proposed novel flash tank in the quasi-two-stage vapor injection cycle represents an economic and controllable solution. This research experimentally analyzes the influences of flash tank structure and volume on the system heating performance under different compressor frequencies and injection pressures at the ambient temperature of −10 °C. The comparative analysis is done finding that the novel flash tank could maximumly improve the system Coefficient of Performance (COPh) by 6.4% in this test, compared with the traditional type A flash tank cycle. In the meanwhile, a bad design of novel flash tank size could represent a loss of COPh improvement between 5.73% and 13.5%. Due to the particular structure, the implementation of the novel flash tank also allows the injection mass flow ratio can keep a linear relationship with the injection pressure. Moreover, the refrigerant liquid can be regularly injected into the compression chamber to control discharge temperature under 100 °C. From all the analysis, guidelines for optimizing the control strategy and the flash tank design are put forward, which can be used to perfect the real thermodynamic model of the flash tank rather than the ideal two-phase separation model. |
| first_indexed | 2024-03-13T09:10:44Z |
| format | Article |
| id | doaj.art-2901b28c94c04a4ebdbbd13877f2de0d |
| institution | Directory Open Access Journal |
| issn | 2405-8440 |
| language | English |
| last_indexed | 2024-03-13T09:10:44Z |
| publishDate | 2023-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Heliyon |
| spelling | doaj.art-2901b28c94c04a4ebdbbd13877f2de0d2023-05-27T04:26:10ZengElsevierHeliyon2405-84402023-06-0196e16485Comparative research on vapor injection heat pump with a novel flash tankJinfei Sun0Jianxiang Guo1Longbin He2Shengjun Hou3Zhengchang Yu4Key Lab of Industrial Fluid Energy Conservation and Pollution Control (Qingdao University of Technology), China Ministry of Education, 266520, Qingdao, China; Shandong Key Laboratory of Waste Heat Utilization and Energy Saving Equipment Technology, Qingdao University of Technology, 266520, Qingdao, China; College of Environmental and Municipal Engineering, Qingdao University of Technology, 266520, Qingdao, China; Corresponding author. Key Lab of Industrial Fluid Energy Conservation and Pollution Control (Qingdao University of Technology), China Ministry of Education, 266520, Qingdao, China.Key Lab of Industrial Fluid Energy Conservation and Pollution Control (Qingdao University of Technology), China Ministry of Education, 266520, Qingdao, China; Shandong Key Laboratory of Waste Heat Utilization and Energy Saving Equipment Technology, Qingdao University of Technology, 266520, Qingdao, China; College of Environmental and Municipal Engineering, Qingdao University of Technology, 266520, Qingdao, ChinaKey Lab of Industrial Fluid Energy Conservation and Pollution Control (Qingdao University of Technology), China Ministry of Education, 266520, Qingdao, China; Shandong Key Laboratory of Waste Heat Utilization and Energy Saving Equipment Technology, Qingdao University of Technology, 266520, Qingdao, China; College of Environmental and Municipal Engineering, Qingdao University of Technology, 266520, Qingdao, ChinaKey Lab of Industrial Fluid Energy Conservation and Pollution Control (Qingdao University of Technology), China Ministry of Education, 266520, Qingdao, China; Shandong Key Laboratory of Waste Heat Utilization and Energy Saving Equipment Technology, Qingdao University of Technology, 266520, Qingdao, China; College of Environmental and Municipal Engineering, Qingdao University of Technology, 266520, Qingdao, ChinaKey Lab of Industrial Fluid Energy Conservation and Pollution Control (Qingdao University of Technology), China Ministry of Education, 266520, Qingdao, China; Shandong Key Laboratory of Waste Heat Utilization and Energy Saving Equipment Technology, Qingdao University of Technology, 266520, Qingdao, China; College of Environmental and Municipal Engineering, Qingdao University of Technology, 266520, Qingdao, ChinaTwo major problems for the vapor injection heat pump systems with the flash tank are the high discharge temperature and the lack of flash tank design theoretical basis, which would limit its wide application in extreme operating conditions. One possible way to overcome these problems is to effectively control the two-phase injection in the flash tank by optimizing its structure. The use of the proposed novel flash tank in the quasi-two-stage vapor injection cycle represents an economic and controllable solution. This research experimentally analyzes the influences of flash tank structure and volume on the system heating performance under different compressor frequencies and injection pressures at the ambient temperature of −10 °C. The comparative analysis is done finding that the novel flash tank could maximumly improve the system Coefficient of Performance (COPh) by 6.4% in this test, compared with the traditional type A flash tank cycle. In the meanwhile, a bad design of novel flash tank size could represent a loss of COPh improvement between 5.73% and 13.5%. Due to the particular structure, the implementation of the novel flash tank also allows the injection mass flow ratio can keep a linear relationship with the injection pressure. Moreover, the refrigerant liquid can be regularly injected into the compression chamber to control discharge temperature under 100 °C. From all the analysis, guidelines for optimizing the control strategy and the flash tank design are put forward, which can be used to perfect the real thermodynamic model of the flash tank rather than the ideal two-phase separation model.http://www.sciencedirect.com/science/article/pii/S2405844023036927Refrigerant injectionNovel flash tankHeat pumpHeating capacityEnergy equipment |
| spellingShingle | Jinfei Sun Jianxiang Guo Longbin He Shengjun Hou Zhengchang Yu Comparative research on vapor injection heat pump with a novel flash tank Heliyon Refrigerant injection Novel flash tank Heat pump Heating capacity Energy equipment |
| title | Comparative research on vapor injection heat pump with a novel flash tank |
| title_full | Comparative research on vapor injection heat pump with a novel flash tank |
| title_fullStr | Comparative research on vapor injection heat pump with a novel flash tank |
| title_full_unstemmed | Comparative research on vapor injection heat pump with a novel flash tank |
| title_short | Comparative research on vapor injection heat pump with a novel flash tank |
| title_sort | comparative research on vapor injection heat pump with a novel flash tank |
| topic | Refrigerant injection Novel flash tank Heat pump Heating capacity Energy equipment |
| url | http://www.sciencedirect.com/science/article/pii/S2405844023036927 |
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